HomeMy WebLinkAboutDevelopedvsUndevelopedHydrologicAnalysis(Apr.4,2003)DEVELOPED VS. UNDEVELOPED HYDROLOGIC ANALYSIS
FOR WOLF VALLEY SPECIFIC PLAN
CITY OF TEMECULA
TRACT 29798 AND TRACT 30264
FEBRUARY 7, 2003
Revised APRIL 4, 2003
CASE I- HYDROLOGIC CALCULATIONS FOR
EXISTING CONDITIONS VS. DEVELOPMENT OF
NORTH HALF OF WOLF CREEK
(SOUTH HALF UNDEVELOPED) ~
!~
' Hetman S. Hovagimyan `mn
No. 20278
Ezp. s-sa05 ~
s civil \P
~ OF CA~~F~~~
PREPARED BY
:: Lohr + Associates Inc
Lend Plannln0 a~513 RiOaa Park Drlve
CIVU Englneering Tomxuls CA 92580
Surveying Ph. 909 676-6728 Fea 909 698-0896
ATTENTION: HERMAN HOVAGIMYAN
TELEPHONE: (909) 676-6726
~ ~~~~IV~
~ ANR 1 5 ?003
~ _ ~lTY OF TEA~ECULF
\
' LOHR + qSSOCIATES INC. . 7'~ _" sf 7~8 ~ TA'; -~ _`°_ r" JOB No. 3 a a a~
43513 RIDGE PARK DRIVE __ ~ BY ,UF,e~n~rJ
TEMECULA,CA92590 _ DATE ~2 ~8 :'~2
I ~ PH.909~76-6726 _ SHT. /
FAX 909~99-0896 OF
' • LqND PLANNING ~ CIVIL ENGINEERING ~ SURVEYING
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- SOIL4 GROUP BOUN~AR~
• SOILS GROUP DESIGNATION FOR
R C F C 8~ W C D PECHANGA
i-IYDROLOGY 1~/IANUAL ~
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t. Maximum Isnqth • 1000 Feet
2. Ma:imum orsa = 10 Acr~s
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6 10 - Slnqle Family-2 I/2 Acre Lot
EXAMPLE~
5 ( I) L= 550~, H= 5.0~, K=Sinqle Family (5-7 Du/AC)
Development, Tc=12.6 min.
4 (2) L=550~, H=5.0~, K-Commercial
Development, Tc=9.T min.
SAN BERNARDINO COUNTY
HYDROLOGY MANUAL
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Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDSSIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264ABX.out
~ ------------------------------------------------------------------------
TR 30264 SXISTING CONDITION BXLUDING OFF-SITES
- 100 YSAR STORM
~ JN 32006
------------------------------------------------------------------------
**~*****+ Hydrology Study Control Information **********
, English (in-lb) Units uaed in input data file
------------------------------------------------------------------------
~ Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
Rational Method Hydrology Program based on
, Riverside County Flood Control & Water Conaervation District
1978 hydrology manual
~ Stoxm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intenaity-duration curves data (Plate D-4.1)
For the [ Murrieta,Tmc,Rnch CaNorco I area used.
, 10 year atorm 10 minute intensity = 2.3b0(in/Hr)
10 year etorm 60 minute intensity = 0.880(In/Hr)
100 year etorm 10 minute intenaity = 3.480(in/Hr}
1 100 year storm 60 minute intensity = 1.300(In/Hr}
Stoxm event year = 100.0
' Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 100.000 to Point/Station 101.000
**** INITIAL ARSA BVALUATION ****
' Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1148.000(Ft.)
~ Bottom (Of initial area) elevation = 1130.300(Ft.)
Difference in elevation = 17.700(Ft.) ,
Slope = 0.01770 s(percent)= 1.77
, TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 18.823 min.
Rainfall inteneity = 2.460(in/Hr) for a 100.0 year storm
UNDEVSLOPSD (poor cover) subarea
' Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pexvious area fraction = 1.000; Impervious fraction = 0.000 ~~
lo~
~ Initial subarea runoff = 19.200(CFS)
Total initial stream area = 10.000(Ac.)
~ Pexvious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
- **** NATURAL CHANNBL TIMS + SUBAREA FLOW ADDITION ***+'
' Top of natural channel elevation = 1130.300(Ft.)
Snd of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
, Sstimated mean flow rate at midpoint of channel = 37.440(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.45(Ft/s)
~ Correction to map elope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0156
~ Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 min. TC = 22.49 min.
' Adding area flow to channel
UNDBVSLOPED (poor cover) subarea
Runoff Coefficient = 0.770
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) ~8.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.230(In/Hr) for a 100.0 year storm
~ Subarea runoff = 32.632(CFS) for 19.000(Ac.)
Total runoff = 51.832(CFS) Total area = 29.000(AC.)
' +++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 302.000 to Point/Station 103.000
**** N1-TURAL CHANNSL TIMS + SUBARBA FLOW ADDITION +**t
' Top of natural channel elevation = 1115.000(Ft.)
Bnd of natural channel elevation = 1100.500(Ft.)
~ Length of natural channel = 1020.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 67.203(CFS)
, Natural valley channel type uaed
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(I3ngliah Unite)".352)(slope"0.5)
Velocity using mean channel flow = 5.03(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0142
Corrected/adjueted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min. "
i
r '°3
Adding area flow to channel
~ UNDBVSLOPBD (poor cover) suba=ea.
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year storm
Subarea runoff = 27.039(CFS) for 17.200(Ac.)
, Total runoff = 78.870(CFS) Total area = 46.200(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
- **** NATITRAL CHANNSL TIMB + SUBAREA FLOW ADDITION **++
~ Top of natural channel elevation = 1100.500(Ft.)
Snd of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 420.000(Ft.)
~ Satimated mean flow rate at midpoint of channel = 79.297(CFS)
- Natural valley channel type used
L.A. County flood control diatrict formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
velocity using mean channel flow = 4.69(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0112
~ Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
' Adding area flow to channel
UNDEVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.758
, Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 1.000
Decimal fraction soil group C= 0.000
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impezvious fraction = 0.000
Rainfall intensity = 2.002(in/Hr) for a 100.0 year storm
, Subarea runoff = 0.758(CFS) for 0.500(AC.)
Total runoff = 79.629(CFS) Total area = 46.700(AC.)
, +++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++
Procesa from Point/Station 107.000 to Point/Station 107.000
•*** CONFLIISNCB OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 46.700(AC.)
' Runoff from this stream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(In/Hr)
~ `L
lu~+
r
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Proceas from Point/Station 104.000 to Point/Station 105.000
**** INITIAL ARBA BVALUATION ***+
~ Initial area flom distance = 785.000(Ft.)
Top (of initial area) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.000(Ft.)
Difference in elevation = 14.000(Ft.)
, Slope = 0.01783 s(percent)= 1.78
TC = k(0.530)*[(length"3)/(elevation change))"0.2
Initial area time of concentration = 17.060 min. ~
, Rainfall intensity = 2.596(In/Hr) for a 100.0 year storm
UNDSVSLOPED (poor cover) subarea
Runoff Coefficient = 0.786
' Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Perviou8 area fraction = 1.000; Impervious fraction = 0.000
Initial aubarea runoff = 20.410(CFS)
~ Total initial atream area = 10.000(Ac.)
Pervious area fraction = 1.000
' ++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
;*** NATURAL CHANNfiL TIMB + SUBARBA FLOW ADDITION **~*
~ Top of natural channel elevation = 1133.000(Ft.)
Snd of natural channel elevation = 1116.000(Ft.)
' Length of natural channel = 1175.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 32.655(CFS)
Natural valley channel type used
~ L.A. County flood control dietrict foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(&nglish Unita)".352)(slope"0.5)
Velocity using mean channel flow = 4.12(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81 mi.n.
~ Adding area flow to channel
UNDEV$LOPBD (poor cover) subarea
' Runoff Coefficient ~ 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.268(In/Hr) for a 100.0 year storm
Subarea runoff = 21.013(CFS) for 12.000(Ac.)
Total runoff = 41.423(CFS) Total area = 22.000(Ac.)
' ~
~ IOJ
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Procesa from Point/Station 106.000 to Point/Station 107.000
**** NATURAL CHANNEL TIMS + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1116.000(Ft.)
$nd of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
~ Satimated mean flow rate at midpoint of channel = 50.366(CFS)
Natural valley channel type used
L.A. County flood control district forniula for channel velocity:
~ Velocity(ft/s) _ (7 ~ 8iq(Snglish Units)".352)(slope"0.5)
Velocity uaing mean channel flow = 4.91(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0160
Corrected/adjusted channel slope = 0.0160
~ Travel time = 4.28 min. TC = 26.08 min.
' Adding area flow to channel
UNDBt~SLOPBD (poor cover) subarea
Runoff Coefficient = 0.761
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pezvioue area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.05b(Zn/Hr) for a 100.0 year storm
' Subarea runoff = 14.857(CFS) for 9.500(Ac.)
Total runoff = 56.279(CFS) Total area = 31.500(Ac.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
_ ProcesB from Point/Station 107.000 to Point/Station 107.000
**** CONFLUBNCB OF MINOR STREAMS ****
, Along Main Stream number: 1 in normal stream number 2
Stream flom area = 31.500(Ac.)
~ Runoff from this stream = 56.279(CFS)
Time of concentration = 26.08 min.
Rainfall intensity = 2.056(In/Hr)
Summaxy of etream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~' 1 79.629 27.36 2.002
2 56.279 26.08 2.056
' Largest stream flow has longer time of concentration
Qp = 79.629 + sum of
Qb Ia/Ib
' 56.279 ~ 0.974 = 54.815
Qp = 134.443
, Total of 2 streams to confluence: ~,
, lo~
Flow rates before confluence point:
79.629 56.279
~ Area of etreams before confluence:
46.700 31.500
Reaults of confluence:
' Total flow rate = 134.443(CFS)
Time of concentration = 27.365 min.
Sffective stream area after confluence = 78.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 110.000
' **** NATURAL CHANNEL TIMS + SUBARSA FLOW ADDITION *+**
Top of natural channel elevation = 1095.800(Ft.)
' 8nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 910.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 143.899(CFS)
, Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(8nglish Units)".352)(slope"0.5>
, Velocity using mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalis (Plate D-6.2)
Normal channel slope = 0.0091
Corrected/adjusted channel slope = 0.0091
Travel time = 3.00 min. TC = 30.36 min.
,
Adding area flow to channel
' UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
' Total runoff = 150.057(CFS) Total area = 89.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 110.000 to Point/Station 110.000
*'** CONFLUENCB OF MINOR STRSAMS •***
' Along Main Stream number: 1 in nozmal stream number 1
Stream flow area = 89.200(AC.)
Runoff from this atream = 150.057(CFS)
Time of concentration = 30.36 min.
, Rainfall intensity = 1.891(in/Hr)
, ++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA BiIALUATION ****
' ~5
, Initial area flow distance = 710.000(Ft.)
Top (of initial area) elevation = 1112.000(Ft.)
' Bottom (of initial area) elevation = 1100.000(Ft.)
Difference in elevation = 12.000(Ft.)
Slope = 0.01690 s(percent)= 1.69
~ TC = k(0.530)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 16.565 min.
Rainfall intensity = 2.639(In/Hr) for a 100.0 year atorm
, UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
' Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 17.875(CFS)
Total initial stream area = 8.600(AC.)
Pervious area fraction = 1.000
,
l07
+++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 109.000 to Point/Station 110.000
**** NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION ****
' Top of natural channel elevation = 1100.000(Ft.)
8nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
8stimated mean flow rate at midpoint of channel = 25.046(CFS)
i Natural valley channel type used
L.A. County flood aontrol diatrict formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.51(Ft/s)
Correction to map slope uaed on extremely rugged channels with
' drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0121
Corrected/adjusted channel slope = 0.0121
~ Travel time = 4.89 min. TC = 21.46 min.
, Adding area flow to channel
UND$VELOPSD (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.289(In/Hr) for a 100.0 year storm
Subarea runoff = 12.206(CFS) for 6.900(Ac.)
' Total runoff = 30.081(CFS) Total area = 15.500(Ac.)
~ +++++++++++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCS OF MINOR STR$AMS ****
' `~
'
,
~
'
,
'
~
~I
~
,
,
~
'
,
~
u
'
Along Main Stream number: 1 in noxmal stream number 2
Stream flow area = 15.500(Ac.)
Runoff from this stream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall intensity = 2.289(in/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Ar)
1 150.057 30.36
2 30.081 21.46
L~argest stream flow has longer
= 150.057 + sum of
Qb Ia/Ib
30.081 * 0.826 =
Qp = 174.910
1.891
2.289
time of concentration
24.853
Total of 2 streams to confluence:
Flom rates before confluence point:
150.057 30.081
Area of streams before confluence:
89.200 15.500
Results of confluence:
Total flow rate = 174.910(CFS)
Time of concentration = 30.362 mi.n:
i3ffective stream area after confluence = 104.700(Ac.)
lag
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 110.000 to Point/Station 123.000
**~* NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION •***
Top of natural channel elevation = 1087.500(Ft.)
Snd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 675.000(Ft.)
$stimated mean flow rate at midpoint of channel = 189.778(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.44(Ft/s)
Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2)
~ Nom~al channel slope = 0.0059
Corrected/adjusted channel slope = 0.0059
Travel time = 2.53 min. TC = 32.89 min.
' Adding area flow to channel
UNDSVELOPED (poor cover) subarea
' Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 1.000
, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction =
0.000
`~
'
~i
~
,
'
'
,
Rainfall intensity = 1.809(In/Hr) for a 100.0 year stozm
Subarea runoff = 23.997(CPS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(Ac.)
io9
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUBNCB OF MAIN STREAMS *~**
The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 122.500(Ac.)
Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intenaity = 1.809(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 111.000 to Point/Station 112.000
**** INITIAL ARBA SVALUATION ****
, Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation ~ 1143.000(Ft.)
Bottom tof initial area) elevation = 1135.300(Ft.)
' Difference in elevation = 7.700(Ft.)
Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change))"0.2
Initial area time of concentration = 14.668 min.
' Rainfall intensity = 2.821(In/Hr) for a 100.0 year storm
UNDSVELOPHD (poor cover) subarea
Runoff Coefficient = 0.815
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; impexvious fraction = 0.000
Znitial subarea runoff = 23.004(CFS)
' Total initial stream area = 10.000(AC.)
Pervioue area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 112.000 to Point/Station 113.000
**** NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION ****
'
~'
Top of natural channel elevation = 1135.300(Ft
End of natural channel elevation = 1122.800(Ft
Length of natural channel = 810.000(Ft.)
Satimated mean flow rate at midpoint of channel
44.858(CFS)
' Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngliah Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.66(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0154
~~
, Corrected/adjusted channel slope = 0.0154
Travel time = 2.90 min. TC = 17.56 min.
I~i
J
,
,
'
'
~
~
~
~~
~I
'
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00 .
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.555(In/Hr) for a 100.0 year storm
Subarea runoff = 39.199(CFS) for 19.000(Ac.)
Total runoff = 62.203(CFS) Total area = 29.000(Ac.)
I lo
++++++t++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CHANNBL TIMB + SUHAREA FLOW ADDITION ****
Top of natural channel elevation = 1122.800(Ft.)
Hnd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
$stimated mean flow rate at mi.dpoint of channel = 82.580(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish Unite)".352)(slope"0.5)
Velocity using mean channel flow = 4.75(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
Corrected/adjusted channel slope = 0.0112
, Travel time = 3.68 min. TC = 21.25 min.
' Adding area flow to channel
UNDSVELOPBD (poor cover) subarea
Runoff Coefficient = 0.774
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction ~ 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.301(In/Hr) for a 100.0 year etorm
' Subarea runoff = 33.820(CFS) for 19.000(AC.)
Total runoff = 96.023(CFS) Total area = 48.000(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 114.000 to Point/Station 114.000
**** CONFLUBNCS OF MINOR STRSAMS ****
~ Along Main Stream number: 2 in nosmal stream number 1
Stream flom area = 48.000(AC.)
, Runoff from this stream = 96.023(CFS) `~
,
'
'
'
'
'
~
'
,
,
'
~
Time of concentration = 21.25 min.
Rainfall intensity = 2.301(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.100
**** INITIAL AREA BVALUATION ****
Initial area flow distance = 770.000(Ft.)
Top (of initial area) elevation = 1141.000(Ft.)
Bottom (of initial area) elevation = 1130.000(Ft.)
Difference in elevation = 11.000(Ft.)
Slope = 0.01429 s(percent)= 1.43
TC = k(0.530)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.697 min.
Rainfall intensity = 2.544(In/Hr) for a 100.0 year storm
UNDSVELOP~ (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D~ 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.126(CFS)
Total initial atream area = 9.800(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.100 to Point/Station 116.000
**** NATURAL CHANNBL TIMS + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1130.000(Ft.)
Bnd of natural channel elevation = 1106.500(Ft.)
Length of natural channel = 1340.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 30.806(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unita)".352)(slope"0.5)
Velocity uaing mean channel flow = 4.47(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0175
' Corrected/adjuated channel slope = 0.0175
Travel time = 5.00 min. TC = 22.70 min.
'
~
'
1
Adding area flow to channel
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.795
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Penrious area fractio
Rainfall intensity =
group A = 0.000
group 8 = 0.500
group C = 0.500
group D = 0.000
2) = 82.00
n= 1.000; Impervious fraction = 0.000
2.219(In/Hr) for a 100.0 year etornt ~
112
' Subarea runoff = 18.350(CFS) for 10.400(AC.)
Total runoff = 38.476(CFS) Total area = 20.200(Ac.)
'
++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUENCS OF MINOR STR$AMS ****
Along Main Stream number: 2 in nomial stream number 2
' Stream flow area = 20.200(Ac.)
Runoff from this stream = 38.476(CFS)
Time of concentration = 22.70 min.
, Rainfall inteneity = 2.219(in/Ar)
Summary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
, 1 96.023 21.25 2.301
2 38.4~6 22.70 2.219
Largest stream flow has longer or shorter time of concentration
' Qp = 96.023 + sum of
Qa Tb/Ta
38.476 * 0.936 = 36.020
Qp = 132.042
' Total of 2 streame to confluence:
Flow ratea before confluence point:
' 96.023 38.476
Area of streams before confluence:
48.000 20.200
' Results of confluence:
Total flow rate = 132.042(CFS)
Time of concentration = 21.247 min.
Sffective etream area after confluence = 68.200(AC.)
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 116.000 to Point/Station 123.000
•*** IMPROVSD CHANNBL TRAVSL TIME ****
, Upstream point elevation = 1106.500(Ft.)
Downstream point elevation = 1083.500(Ft.)
Channel length thru subarea 1970.000{Ft.)
Channel base width = 25.000(Ft.)
~ Slope or ~Z~ of left channel bank = 15.000
Slope or ~Z~ of right channel bank = 2.000
Bstimated mean flow rate at midpoint of channel = 142.110(CFS)
~ Manning's 'N' = 0.030
Maximum depth of channel = 2.500(Ft.)
Flow(q) thru aubarea = 142.110(CFS)
Depth of flow = 0.958(Ft.), Average velocity = 4.475(Ft/s)
' Channel flow top width = 41.290(Ft.)
Flow Velocity = 4.47(Ft/s)
Travel time = 7.34 min.
, Time of concentration = 28.58 min.
Sub-Channel No. 1 Critical depth = 0.898(Ft.)
' ' ' Critical flow top width = 40.273(Ft.) 2\
'
'
'
'
'
'
'
,
~
'
'
~I
,
'
'
~
~~
Critical flow velocity= 4.847(Ft/s)
Critical flow area = 29.322(Sq.Ft)
Adding area flow to channel
UNDI3VSLOPBD (poor cover) subarea
Runoff Coefficient = 0.755
Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.955(In/Hr) for a 100.0 year storm
Subarea runoff = 15.343(CFS) for 10.400(Ac.)
Total runoff = 147.385(CFS) Total area = 78.600(Ac.)
I13
+++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++
Procesa from Point/Station 123.000 to Point/Station 123.000
**** CONFLUSNCS OF MAIN STRBAMS ****
The following data inside Main Stream ie listed:
In Main Stream number: 2
Stream flow area = 78.600(Ac.)
Runoff from this stream = 147.385(CFS)
Time of concentration = 28.58 min.
Rainfall inteneity = 1.955(in/Hr)
Program is now starting with Main Stream No. 3
++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++~+++++++
Process from Point/Station 117.000 to Point/Station 117.000
**** USPR DBFINfiD FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.617(In/Iir) for a 100.0 year storm
SINGLB FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction aoil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500
User apecified values are as follows:
TC = 16.82 min. Rain intensity = 2.62(in/Hr)
Total area = 62.70(Ac.) Total runoff = 129.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNBL TIMB + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1118.000(Ft.)
, Bnd of natural criannel elevation = 1101.000(Ft.)
Length of natural channel = 790.000(Ft.)
Sstimated mean flom rate at midpoint of channel = 138.258(CFS)
' Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish Units)".352)(slope"0.5) ~v
'
114
, Velocity using mean channel flow = 7.68(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalla {Plate D-6.2)
Normal channel slope = 0.0215
' Corrected/adjueted channel alope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
' Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.782 ~
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.460(In/Hr) for a 100.0 year etorm
, Subarea runoff = 17.447lCFS) for 9.000(Ac.)
Total xunoff ~ 146.447(CFS) Total area = 71.700(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 121.000
' **+* NATURP,L CHANNSL TIMB + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
$nd of natural channel elevation = 1090.500(Ft.)
' Length of natural channel = 980.000(Ft.)
Sstimated mean flow rate at mi.dpoint of channel = 156.251(CFS)
' Natural valley channel type used
L.A. County flood control dietrict formula for channel velocity:
Velocity(ft/a) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.63(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0107
Corrected/adjusted channel alope = 0.0107
Travel time = 2.90 min. TC = 21.44 min.
~ Adding area flom to channel
UNDEVSLOPSD (poor cover) subarea
, Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervioue fraction = 0.000
' Rainfall intensity = 2.290(In/Hr) for a 100.0 year storm
Subarea runoff = 16.992(CFS) for 9.600(Ac.)
Total runoff = 163.439(CFS) Total area = 81.300(Ac.)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 121.000 to Point/Station 121.000 „ryi
l/
1 #~~*
OF MINOR STRSAMS ****
' Along Main Stream number: 3 in normal stream number 1
Stream flow area = 81.300(Ac.)
Runoff from this atream = 163.439(CFS)
' Time of concentration = 21.44 min.
Rainfall intensity = 2.290{In/Hr)
i~5
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 119.000 to Point/Station 120.000
•~** INITIAL ARBA L~IALUATION **** ~
'
'
'
L_1
1
~
,
~
,
'
'
,
'
'
'
Initial area flow distance = 920.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1094.000(Ft.)
Difference in elevation = 66.000(Ft.)
Slope = 0.07174 s(percent)= 7.17
TC = k(0.48U)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 12.462 min.
Rainfall intensity = 3.086(In/Hr) for a 100.0
SINGLB FAMILY (1 Acre Lot)
Runoff Coefficient = 0.718
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.800; Impervious fraction
initial subarea runoff = 7.085(CFS?
Total initial stream area = 3.200(Ac.)
Pervious area fraction = 0.800
year storm
0.200
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 120.000 to Point/Station 121.000
***• NATURAL CHANNBL TIMB + SUBARBA FLOW ADDZTION ***•
Top of natural channel elevation = 1094.000(Ft.)
End of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 9.520(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 1.95(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0063
Corrected/adjusted channel alope = 0.0063
Travel time = 4.78 min. TC = 17.25 min.
Adding area flow to channel
UNDEVELOPBD (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~
ii~
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(In/Fir) for a 100.0 year storm
~ Subarea runoff =. 4.460(CFS) for 2.200(Ac.)
' Total runoff = 11.545(CFS) Total area = 5.400(Ac.)
~, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
*~** CONFLUSNCS OF MINOR STREAMS ****
~ Along Main Stream number: 3 in noxmal stream number 2
Stream flow area = 5.400(AC.)
Runoff from this stream = 11.545(CFS)
~ Time of concentration = 17.25 min.
Rainfall inteneity = 2.581(In/Hr)
Summary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
'~ 1 163.439 21.44 2.290
2 11.545 17.25 2.581
~ Largest stream flow has longer time of concentration
Qp = 163.439 + sum of
Qb Ia/Ib
~ 11.545 * 0.887 = 10.243
~ Qp = 173.682
~ Total of 2 atreams to confluence:
Flow'rates before confluence point:
163.439 11.545
Area of atreams before confluence:
~ 81.300 5.400
Reeults of confluence:
Total flow rate = 173.682tCFS)
' Time of concentration = 21.438 min.
Bffective etream area after confluence = 86.700(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNBL TIMS + SUBARBA FLOW ADDITION ***~
~ Top of natural channel elevation = 1090.500(Ft.)
Bnd of natural channel elevation = 1087.100(Ft.)
~ Length of natural channel = 740.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 192.512(CFS)
Natural valley channel type used
~ L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(alope"0.5)
Velocity using mean channel flow = 3.93(Ft/s)
~ Correction to map slope used on extremely rugged channels with
- dropa and waterfalls (Plate D-6.2)
Normal channel slope = 0.0046 ~
~
I17
~ Corrected/adjuated channel slope = 0.0046
Travel time = 3.14 min. TC = 24.58 min.
~~ Adding area flow to channel
,~ UNDBVBIAPED (poor cover) subarea
~ Runoff Coefficient = 0.765
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Penrious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.124(In/Hr) for a 300.0 year storm
Subarea runoff = 30.531(CFS) for 18.800(Ac.)
~ Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 122.000 to Point/Station 123.000
**** NATURAL CHANNSL TIMB + SIIBAREA FLOW ADDITION ****
1~~ Top of natural channel elevation = 1087.300(Ft.)
8nd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
8stimated mean flow rate at midpoint of channel = 213.310(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 ~ 8(q(Snglish Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 3.08(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0026
Corrected/adjusted channel slope = 0.0026
~ Travel time = ~.36 min. TC = 31.94 min.
I Adding area flow to channel
UNDIiVBLOPED (poor cover) subarea
Runoff Coefficient = 0.747
,~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fracGion soil group D= 0.000
~ RI index for eoil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.839(in/Hr) for a 100.0 year stoxm
~ Subarea runoff = 12.915(CFS) for 9.400(AC.)
Total runoff = 217.127(CFS) Total area = 114.900(Ac.)
,,; ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
f' Proceae from Point/Station 123.000 to Point/Station 123.000
**** CONFLUBNCS OF MAIN STRSAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 3
' Stream flow area = 114.900(AC.) 2(v
II~
'
~
[J
~
~~
~~~
~i
,~~
'
~
~
~
~
1
Runoff from this atream
Time of concentration =
Rainfall inteneity =
Summary of stream data:
= 217.127(CFS)
31.94 min.
1.839(In/Hr)
Stream Flow rate TC
No. (CFS) (min)
1 198.907 32.89
2 147.385 28.58
3 217.127 31.94
Largest stream flow has longer
Qp = 217.127 + sum of
Qa Tb/Ta
198.907 * 0.971 =
Qb Ia/Ib
149.385 * 0.941 =
Qp = 548.922
Rainfall Intensity
(in/Hr)
1.809
1.955
• 1.839
or shorter time of concentration
193.139
138.656
Total of 3 main streams to confluence:
Flow rates before confluence point:
198.907 147.385 217.127
Area of streams before confluence:
122.500 78.600 114.900
Results of confluence:
Total flow rate = 548.922(CFS)
Time of concentration = 31.940 min.
Sffective stream area after confluence = 316.000(Ac.)
~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 129.000
**** IMPROVBD CHANNSL TRAVSL TIMII ****
Upatream point elevation = 1083.500(Ft.)
Downstream point elevation = 1061.500(Ft.)
Channel length thzu subarea = 910.000(Ft.)
Channel base width = 4.000{Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Sstimated mean flow rate at midpoint of channel = 551.962(CFS)
Manning's 'N~ ~ 0.030
Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 551.962(CFS)
Depth of flow = 3.785(Ft.), Average velocity = 12.601(Ft/s)
Channel flow top width = 19.142(Ft.)
Flow Velocity = 12.60(Pt/s)
Travel time = 1.20 min.
Time of concentration = 33.14 min.
Sub-Channel No. 1 Critical depth =
~ ' ~ Critical flow
' ' ' Critical flow
' ' ' Critical flow
Adding area flow to channel
UNDSVBLOPSD (poor cover) subarea
4.563(Ft.
top width =
velocity=
area = 59
22.250(Ft.)
.217(Ft/8)
883(Sq.Ft)
2ti
1 II~
Runoff Coefficient = 0.745
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 1.802(in/xr) for a 100.0 year storm
Subarea runoff = 4.696(CFS) for 3.500(Ac.)
~ Total runoff = 553.618(CFS) Total area = 319.500(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENC6 OF MAIN STRSAMS ****
`~, The following data ineide Main Stream is listed:
In Main Stream number: 1
~ Stream flow area = 319.500(AC.)
Runoff from this atream = 553.618(CFS)
Time of concentration = 33.14 min.
Rainfall inteneity = 1.802(In/Hr)
~ Program is now atarting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 124.000
**** INZTIAL ARSA EVALUATION ****
,~ Initial area flow distance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1088.000(Ft.)
Difference in elevation = 72.000(Ft.)
,~; Slope = 0.08372 s(percent)= 8.37
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
~ initial area time of concentration = 12.987 min.
Rainfall intensity = 3.016(In/Hr) for a 100.0 year storni
UNDSVBLOPBD (poor cover) subarea
Runoff Coefficient = 0.800
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
initial subarea runoff = 7.724(CFS)
~ Total initial stream area = 3.200(AC.)
' Pexvious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
~ **** IMPROVBD CHANNSL TRAVSL TIME ****
Upstream point elevation = 1088.000(Ft.)
Downatream point elevation = 1079.000(Ft.)
~ Channel length thru subarea = 390.000(Ft.)
Channel base width 17.000(Ft.)
Slope or ~Z~ of left channel bank = 2.000
I Slope or 'Z' of right channel bank = 5.000 ~¢j
, Satimated mean flow rate at midpoint of channel =
~
~
~.
~~
Manning's 'N' = 0.030
Maximum depth of channel =
Flow(q) thru subarea = 8
Depth of flow = 0.198(Ft.),
Channel flow top width = 18
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
Time of concentration = 15.
1.000(Ft.}
690(CFS)
Average velocity =
384(Ft.)
60 min.
Sub-Channel No. 1 Critical depth =
' ' ' Critical flow
~ ~ ~ Critical flow
~ ~ ~ Critical flow
0.199(Ft
top width =
velocity=
area =
8.690(CFS)
2.484(Ft/8)
18.395(Ft
.465(Ft/s?
526(Sq.Ft)
~ Adding area flow to channel
UNDBVELOPED (poor cover) subarea
Runoff Coefficient = 0.791
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervioue fraction = 0.000
Rainfall intenaity = 2.727(In/Hr) for a 100.0 year storm
,~ Subarea runoff = 1.725(CFS) for 0.800(AC.)
Total xunoff = 9.450(CFS) Total area = 4.000(Ac.)
120
,~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUSNCS OF MINOR STRBAMS ***+
.~~ Along Main Stream number: 2 in normal atream
Stream flow area = 4.000(AC.)
~ Runoff from this stream = 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall intensity = 2.727(In/Hr)
~' ++++++++++t++++++++++++++++++++++++++++++++++t++++++++++++++++++++++++
Proceas from Point/Station 125.000 to PointJStation 125.000
**** USBR DBFINBD FLOPT INFORMATION AT A POINT ****
~ Rainfall intensity = 2.104(In/Hr) for a 100.0 year storm
SINGL$ FAMILY (1/4 Acre Lot) -
~ Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.400
1 Decimal fraction soil group C= 0.600
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 63.80
Pervioue area fraction = 0.500; Impervious fraction = 0.500
~ Uaer specified values are as followa:
TC = 25.00 min. Rain intenaity = 2_10(In/Hr)
Total area = 118.00(AC.) Total runoff = 293.20(CFS)
;~,
+++++++++t++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000 ~A,
~
~ **** CONFLUSNCB OF MINOR STRfiAMS ****
~ Along Main Stream number: 2 in normal stream number 2
, Stream flow area = 118.000(Ac.)
Runoff from this stream = 293.200(CFS)
~ Time of concentration = 25.00 min.
Rainfall intensity = 2.104(In/Hr)
Summary of stream data:
~ Stream Flow rate TC
, No. (CFS) (min)
;~ 1 9.450 15.60
2 293.200 25.00
Largeat stream flow has longer
~ Qp = 293.200 + sum of
Qb Ia/Ib
~
Qp = 9.450 *
300.492 0.772 =
,~
~~
,~
~
~
~
~,
,~
~
Rainfall Intensity
(In/Hr)
2.727
2.104
time of concentration
7.292
Total of 2 streama to confluence:
Flow rates before confluence point:
9.450 293.200
Area of streams before confluence:
4.000 118.000
Reaults of confluence:
Total flow rate = 300.492(CFS)
Time of concentration = 25.000 min.
Bffective stream area after confluence = 122.000(AC.)
iai
++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 125.000 to Point/Station 126.000
**** IMPROVSD CHANNBL TRAVEL TIMS ****
Upstream point elevation = 1079.000(Ft.)
Downatream point elevation = 1073.700(Ft.)
Channel length thru subarea = 870.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or 'Z~ of left channel bank = 3.000
Slope or ~Z~ of right channel bank = 6.000
Sstimated mean flow rate at midpoint of channel =
Manning~s 'N~ = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru aubarea = 319.211(CFS)
Depth of flow = 3.059(Ft.), Average velocity =
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Ft/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
319.211(CFS)
5.561(Ft/s)
Sub-Channel No. 1 Critical depth = 2.656(Ft.)
' ' ' Critical flow top width = 28.906(Ft.)
' ' ' Critical flow velocity= 7.089(Ft/s)
' ' ' Critical flow area = 45.032(Sq.Ft)
Adding area flow to channel
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.757
~o
'
.~
~
~
.~
,~
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.992(In/Hr) for a 100.0 year storm
Subarea runoff = 22.927(CFS) for 15.200(Ac.)
Total runoff = 323.419(CFS) Total area = 137.200(AC.)
122
++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 126.000 to Point/Station 127.000
++r* IMPROVSD CHANNEL TRAVfiL TIMS ****
Upetream point elevation = 1073.700(Ft.)
Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or ~Z~ of left channel bank = 3.000
Slope or ~Z~ of right channel bank = 6.000
Bstimated mean flow rate at midpoint of channel = 341.099(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 341.099(CFS)
Depth of flow = 3.846(Ft.), Average velocity = 3.976(Ft/s)
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
Travel time = 2.47 min.
Time of concentration = 30.08 min.
Sub-Channel No. 1 Critical depth =
' ' ' Critical flow
' ' ' Critical flow
' ' ' Critical flom
2.750(Ft.
top width =
velocity=
area = 47
29.750(Ft
.139(Ft/s)
781(Sq.Ft)
~ Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.751
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervioue fraction = 0.000
Rainfall intensity = 1.900(In/Hr) for a 100.0 year storm
Subarea runoff = 21.418(CFS) for 15.000(AC.)
A. Total runoff = 344.837(CFS) Total area = 152.200(Ac.)
~ ++++++++++++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 127.000 to Point/Station 128.000
**** IMPROVSD CHANNSL TRAVEL TIMS ****
~ Upstream point elevation = 1072.300(Ft.)
Downetream point elevation = 1068.900(Ft.)
I Channel length thru subarea = 620.000(Ft.)
Channel base width = 20.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000
; Slope or 'Z~ of right channel bank = 40.000 ~~
113
, Bstimated mean flow rate at midpoint of channel = 359.564(CFS)
' Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 359.564(CFS)
Depth of flow = 1.690(Ft.), Average velocity = 3.721(Ft/s)
~ Channel flow top width = 94.361(Ft.)
Flow Velocity = 3.72(Ft/s)
Travel time = 2.78 min.
Time of concentration = 32.86 min.
~' Sub-Channel No. 1 Critical depth = 1.367(Ft.)
•' ' ' Critical flow Cop width = 80.156(Ft.)
~ ' ' ' Critical flow velocity= 5.252(Ft/s)
' ' ' Critical flow area = 68.466(Sq.Ft)
~ Adding area flow to channel
UNDEVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.745
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D a 0.000
RI index for soil(AMC 2) = 78.00
j. Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.810(In/Hr) for a 100.0 year storm
~ Subarea runoff = 17.538(CFS) for 13.000(AC.)
Total xunoff = 362.376(CFS) Total area = 165.200(Ac.)
+++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
~ **t* IMPROVED CHANNSL TRAVSL TIMS *t**
~ Upstream point elevation = 1068.900(Ft.)
Downstream point elevation = 1061.500tFt.)
Channel length thru subarea = 750.000(Ft.)
~ Channel base width = 10.000(Ft.?
Slope or ~z~ of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
~ Sstimated mean flow rate at midpoint of channel = 377.731(CFS)
Manning's 'N' g 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru eubarea = 377.731(CFS)
~ Depth of flow = 2.986(Ft.), Average velocity = 7.920(Ft/s)
Channel flow top width = 21.944(Ft.)
Flow Velocity = 7.92(Ft/s)
1 Travel time = 1.58 min.
Time of concentration = 34.44 min.
~ Sub-Channel No. 1 Critical depth = 2.906(Ft.)
' ' ' Critical flow top width = 21.625(Ft.)
' ' ' Critical flow velocity= 8.220(Ft/s)
~ ' ~ Critical flow area = 45.955(Sq.Ft)
~ Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
~ Runoff Coefficient = 0.742
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000 ~y
~ 24~
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000;_Impervious fraction = 0.000
Rainfall intensity = 1.764(Zn/Hr) for a 100.0 year stozm
Subarea runoff = 18.324(CFS) for 14.000(AC.)
~ Total runoff = 380.700(CFS) Total area = 179.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 129.000 to Point/Station 129.000
~ **** CONFLUBNCS OF MAIN STRBAMS **~*
The following data inside Main Stream is listed:
!, In Main Stream number: 2
Stream flow area = 179.200(Ac.)
Runoff from this stream = 380.700(CFS)
~ Time of concentration = 34.44 min.
Rainfall intenaity = 1.764(In/Hr)
Program is now starting with Main Stream No. 3
~
+++++++++++++++++++++++++++++++++++++++++++++t++++++++++++++++++++++++
~ Proceas from Point/Station 129.000 to Point/Station 129.000
**** USER DSFINED FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 2.787(In/Hr) for a 100.0 year etorm
COI~IBRCIAL aubarea type
Runoff Coefficient = 0.875
Decimal fraction soil group A= 0.000
1 Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
User specified values are as followa:
TC = 15.00 min. Rain intensity = 2.79(in/Hr)
; Total area = 87.00(AC.) Total runoff = 108.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~, Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUSNCB OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 3
Stream flow area = 87.000(AC.)
~ Runoff from this atream = 308.000(CFS)
Time of concentration = 15.00 min.
Rainfall intenaity = 2.787(In/Hr)
~ Summary of stream data:
Stream Flom rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~ 1 553.618 33.14 1.802
2 380.700 34.44 1.764
~ 3 108.000 15.00 2.787
Largest stream flow has longer or shorter time of concentration
Qp = 553.618 + sum of ~~
~
~ iz~
Qa Tb/Ta
380.700 * 0.962 = 366.412
~ Qb Ia/Ib
108.000 * 0.647 = 69.832
Qp = 989.862
~ Total of 3 main etreams to confluence:
Flow rates before confluence point:
~
Area 553.618 380.700 108.000
of streama before confluence:
319.500 179.200 87.000
~ Reaulte of confluence:
Total flow rate = 989.862(CFS)
~ Time of concentration = 33.144 min. -
Sffective etream area after confluence 585.700(AC.)
Bnd of computations, total atudy area = 585.70 (AC.)
~ The folloming fiqurea may
be used for a unit hydrograph etudy of the same area.
Area averaged pervious area fraction(Ap) = 0.711
~ Area averaged RI index number = 69.7
~,
~
~
~
~~
r
~
~
~
~ ~
^ (SI
^
Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDBSIGN Bngineering Software,(c) 1989 - 2001 Vereion 6.4
Rational Hydrology Study Date: 02/06/03 File:798ASX.out
, . ------------------------------------------------------------------------
TR 29798 BXISTING CONDITION HYDROLOGY $7{CLUDING OFF-SIT$5
- lU0 YSAR STORM
~ JN 32006
------------------------------------------------------------------------
********* Hydroloyy Study Control InfoZ'mdtiOn **********
~ Engliah (in-lb) Units used in input data file
~ ------------------------------------------------------------------------
Lohr & Aseociates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
~ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Storm event (year) = 100.00 Antecedent Moisture Condition = 2
- Standard intensity-duration curves data (Plate D-4.1)
~ For the [ Murrieta,Ttnc,Rnch CaNorco ] area uaed.
10 year stoxm 10 minute intensity = 2.360(in/Hr)
- 30 year storm 60 minute inteneity = 0.880(In/Hr)
300 year stoxm 10 minute intensity = 3.480(In/Hr)
~ 100 year atosm 60 minute intensity = 1.300(In/Hr)
Storm event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intenaity duration curve = 0.5500
~
~ +++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++
Procesa from Point/Station 300.000 to Point/Station 101.000
~ **** INITIAL ARBA BVALUATION ****
Initial area flom dietance = 765.000(Ft.)
Top (of initial area) elevation = 1084.000(Ft.)
, Bottom (of initial area) elevation = 1067.500(Ft.)
Difference in elevation = 16.500(Ft.)
Slope = 0.02157 s(percent)= 2.16
TC = k(0.530)*[(length"3)/(elevation change))"0.2
! Initial area time of concentration = 16.255 min.
Rainfall intensity = 2.666(Zn/Hr) for a 100.0 year stoxm
~ UNDSVSIAPSD (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
1 Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000 f~
RI index for soil(AMC 2) = 78.00 ~j
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Initial subarea runoff = 21.029(CFS)
Total initial stream area = 10.000(Ac
~ Pervious area fraction = 1.000
isz
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNSL TIME + SUBARHA FLOW ADDITION ****
~ Top of natural channel elevation = 1067.500(Ft.)
End of natural channel elevation = 1055.700(Ft.)
Length of natural channel = 1255.000(Ft.)
, Sstimated mean flom rate at midpoint of channel = 37.643(CFS)
Natural valley channel type used
~ L.A. County flood control district forntula for channel velocity:
Velocity(ft/s) _ (7 + S(q(Bnglish Units)".352)(slope"0.5]
Velocity using mean channel flow = 3.46(Ft/s)
~ Correction to map slope used on extremely rugged channels with
, drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0094
~ Corrected/adjusted channel slope = 0.0094
Travel time = 6.04 min. TC = 22.30 min.
~ Adding area flow to channel
UNDBVSLOPHD (poor cover) subarea
Runoff Coefficient = 0.771
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
1 Rainfall inteneity = 2.241(Zn/Hr) for a 100.0 year storm
Subarea runoff = 27.283(CFS) for 15.800(Ac.)
Total runoff = 48.312(CFS) Total area = 25.800(AC.)
'A ++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++++++++
Procesa from Point/Station 102.000 to Point/Station 103.000
~ ***• NATURAL CHANNSL TIMS + SUBARBA FLOW ADDITION ****
* Top of natural channel elevation = 1055.700(Ft.)
Bnd of natural channel elevation = 1055.000(Ft.)
~ Length of natural channel = 370.000(Ft.)
$atimated mean flow rate at midpoint of channel = 66.102(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
' Velocity using mean channel flom = 1.83(Ft/s)
Correction to map slope used on extremely rugged channels mith
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0019
Corrected/adjuated channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min.
,
~
,
~
~
~
~
,
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.762
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.073(In/Hr) for a 100.0
Subarea runoff = 30.012(CFS) for 19.000(AC.)
Total runoff = 78.324(CFS) Total area = 44
= 0.000
year storm
800(Ac.)
!53
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 104.000
**** NATURAL CHANNSL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1055.000(Ft.)
Snd of natural channel elevation = 1051.600(Ft.)
Length of natural channel = 720.000(Ft.)
Satimated mean flow rate at midpoint of channel = 94.059(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Unita)".352)(slope"0.5)
Velocity ueing mean channel flow = 3.20(Ft/s)
Correction to map slope uaed on extremely rugged channels with
~ drops and waterfalls (Plate D-6..2)
Normal channel slope = 0.0047
Corrected/adjusted channel slope = 0.0047
, Travel time = 3.75 min. TC = 29.42 min.
^ Adding area flow to channel
!~_ UNDBVSLOP~ (poor cover) subarea
Runoff Coefficient = 0.753
Decimal fraction soil group A= 0.000
Decimal fraction eoil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.924(In/Hr) for a 100.0 year stozm
Subarea runoff = 26.069(CFS) for 18.000(AC.)
~. Total runoff = 104.393(CFS) Total area = 62.800(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 104.000 to Point/Station 105.000
**** NATtTRAL CHANNBL TIMB + SUBAREA FLOW ADDITION ****
'; Top of natural channel elevation = 1051.600(Ft.)
Snd of natural channel elevation = 1050.600(Ft.)
~ Length of natural channel = 400.000(Ft.)
Satimated mean flow rate at midpoint of channel = 121.348(CFS)
Natural valley channel type used ~j~
~:
~ L.A. County flood control district foxmula for channel velocity:
velocity(ft/s) _ (7 + 8(q(&ngliah Units)".352)(slope"0.5)
~ Velocity ueing mean channel fiow.= 2.52(Ft/s>
Correction to map slope used on extremely rugged channels with
~ drops and waterfalle (Plate D-6.2)
Noimal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
~ Travel time = 2.65 min. TC = 32.07 min.
Adding area flow to channel
~ UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.747
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.835(In/Hr) for a 100.0 year storm
Subarea runoff = 27.954(CFS) for 20.400(Ac.)
' Total runoff = 132.347(CFS) Total area = 83.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 306.000
**** NATURAL CHANNI3L TIMS + SUBARSA FLOW ADDITION ****
~ Top of natural channel elevation = 1050.600(Ft.)
Bnd of natural channel elevation = 1048.000(Ft.)
- Length of natural channel = 650.000(Ft.)
~ Hetimated mean flow rate at midpoint of channel = 149.367(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(8ngliah Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.39(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0040
~ Corrected/adjuated channel slope = 0.0040
Travel time = 3.20 min. TC = 35.27 min.
~ Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.758
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.700
Decimal fraction soil group C= 0.300
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 80.40
Pervious area fraction = 1.000; Impervioua fraction = 0.000
Rainfall intensity = 1.741(In/Hr) for a 100.0 year stozm
~ Subarea runoff = 28.261(CFS) for 21.400(Ac.)
Totai runoff = 160.608(CFS) Total area = 104.600(AC.)
i~~
~ ~~
~
~
155
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 306.000 to Point/Station 106.000
~*** CONFLUSNCfi OF MINOR STRfiAMS ****
Along Main Stream number:
~ Stream flow area = 104
Runoff from this stream =
Time of concentration =
~ Rainfall intensity =
1 in normal stream number 1
.600(Ac.)
160.608(CFS)
35.27 min.
1.741(In/Hr)
+++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++
, Procesa from Point/Station 107.000 to Point/Station 107.000
***• USBR DSFINSD FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 1.773(In/Hr) for a 100.0 year storm
UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.749
'
'
L
~
I;
~
~
~
~
~
,
~
~
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fractio~
User specified values
group A = 0.000
group B = 0.900
group C = 0.100
group D = 0.000
2) = 78.80
i= 1.000; Impervious fraction = 0.000
are as follows:
TC = 34.14 min. Rain intensity = 1.77(In/Hr)
Total area = 585.70(AC.) Total runoff = 989.86(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++
ProCess from Point/Station 107.000 to Point/Station 108.000
**** IMPROVSD CHANNSL TRAVSL TIME ****
Upstream point elevation = 1060.000(Ft.)
Downatream point elevation = 1041.500(Ft.)
Channel length thru subarea = 1650.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or ~Z~ of right channel bank = 2.000
Sstimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum deptri of channel = 7.200(Ft.)
Flow(q) thru subarea = 1000.000(CFS)
Depth of flow = 5.615(Ft.), Average velocity =
Channel flow top width = 27.459(Ft.)
Flow Velocity = 10.97(Ft/s)
Travel time = 2.51 min.
Time of concentration = 36.65 min.
1000.000(CFS)
10.974(Ft/s)
Sub-Channel No. 1 Critical depth = 5.750(Ft.)
' ' ' Critical flow top width = 28.000(Ft.)
~ ~ ~ Critical flow velocity= 10.540(Ft/s)
' ' ' Critical flow area = 94.875(Sq.Ft)
Adding area flow to channel
UNDBVSLOPSD tpoor cover) subarea
Runoff Coefficient = 0.768
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~'
15G
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.705(Zn/Hr) for a 100.0 year stoxm
Subarea runoff = 15.715(CFS) for 12.000(AC.)
. Total runoff = 1005.575(CFS) Total area = 597.700(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 108.000 to Point/Station 108.000
**~* CONFLUENCS OF MINOR STRBAMS ****
1 Along Main Stream number: 1 in nozmal atream number 2
Stream flow area = 597.700(AC.)
Runoff from this stream = 1005.575(CFS)
~ Time of concentration = 36.65 min.
Rainfall intensity = 1.705(In/Hr)
Sununary of stream data:
~ Stream Flow rate TC Rainfall Zntensity
No. (CFS) (min) (In/Hr)
, 1 160.608 35.27 1.741
2 1005.575 36.65 1.705
~ QLa~rgest atream flow has longer time of concentration
1005.575 + sum of
Qb ia/Ib
160.608 * 0.979 = 157.249
~ Qp = 1162.824
Total of 2 atreams to confluence:
~ Flow rates before confluence point:
160.608 1005.575
Area of atreams before confluence:
104.600 597.700
' Resulta of confluence:
Total flow rate = 1162.824(CFS)
Time of concentration = 36.650 min.
~ Effective stream area after confluence = 702.300(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~~ Process from Point/Station 108.000 to Point/Station 109.000
**** IMPROVSD CHANNSL TRAVSL TIMS ****
~ Upstream point elevation = 1041.500(Ft.)
Downstream point elevation = 1025.000(Ft.)
Channel length thru subarea = 2350.000(Ft.)
~ Channel baee width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Eatimated mean flow rate at midpoint of channel =
, Manning~s ~N~ = 0.015
Maximum depth of channel = 8.000(Ft.)
Flow(q) thru subarea = 1177.725(CFS)
~ Depth of flow = 4.923(Ft.), Average velocity =
Channel flow top width = 24.691(Ft.)
Floar Velocity = 16.12(Ft/s)
~ Travel time = 2.43 min.
1177.725(CFS)
16.116(Ft/8)
~o
~ Time of concentration = 39.08 min.
L~i
~
~
~
~
Sub-Channel No. 1 Critical depth.= 6.250(Ft.)
' ' ' Critical flow top width = 30.000(Ft.)
' ' ' Critical flow velocity= 10.768(Ft/s)
' ' ' Critical flow area = 109.375(Sq.Ft)
Adding area flow to channel
UNDSVELOPfiD (poor cover) subarea
Runoff Coefficient = 0.764
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction eoil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) ~ 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.646(In/Hr) for a 100.0 year stozm
Subarea runoff = 22.635(CFS) for 18.000(Ac.)
Total runoff = 1185.459(CFS) Total area = 720.300(AC.)
157
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++
, Procese from Point/Station 109.000 to Point/Station 109.000
***• CONFLUBNCB OF MAIN STRBAMS ****
The following data inside Main Stream is listed:
~ In Main Stream number: 1
Stream flow area = 720.300(AC.)
Runoff from this stream = 1185.459(CFS)
~ Time of concentration = 39.08 min.
Rainfall intenaity = 1.646(In/Hr)
Program is now starting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++~+++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 111.000
' **** INITIAL ARSA BVALUATZON ****
Znitial area flow distance = 1000.000(Ft.)
~ Top (of initial area) elevation = 1058.000(Ft.)
Bottom (of initial area) elevation = 1045.000(Ft.)
Difference in elevation = 13.000(Ft.)
Slope = 0.01300 s(percent)= 1.30
~ TC = k(0.530)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.021 min.
Rainfall intensity = 2.377(In/Hr) for a 100.0 year storm
~ UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.801
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
_ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
, Pervious area fraction = 1.000; impervious fraction = 0.000
Initial subarea runoff = 12.765(CFS)
Total initial stream area = 6.700(AC.)
, Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ ~`
'
~ 158
Process from Point/Station 111.000 to Point/Station 112.000
~*** NATURAL CHANNSL TIMS + SUSAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1045.000(Ft.)
Bnd of natural channel elevation = 1037.000(Ft.)
+, Length of natural channel = 960.000(Ft.)
Estimated mean flow rate at midpoint of channel = 19.909(CFS)
Natural valley channel type used
, L.A. County flood control district fomtula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unite)".352>(slope"0.5)
Velocity using mean channel flow = 2.73(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ Noz~nal channel slope = 0.0083
Corrected/adjusted channel alope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
~' Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.788
!~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500 ~
, Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year stozm
~ Subarea runoff = 12.205(CFS) for 7.500(Ac.)
Total runoff = 24.970(CFS) Total area = 14.200(Ac.)
~~
~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 112.000 to Point/Station 115.000
i **** NAT'URAL CHANNEL TIMB + SUBARSA FLOW ADDITION ****
l
Top of natural channel elevation = 1037.000(Ft.)
~' Snd of natural channel elevation = 1033.400(Ft.)
~~ Length of natural channel = 560.000(Ft.)
Batimated mean flow rate at midpoint of channel = 27.783(CFS)
,~_ Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
~; Velocity using mean channel flow = 2.63(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
` Normal channel slope = 0.0064
Corrected/adjusted channel slope = 0.0064
. Travel time = 3.55 min. TC = 29.43 min.
Adding area flow to channel
' UNDEVSLOPED (poor cover) subarea
~.,: Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
• Decimal fraction soil group S= 0.500
L
~~
~
~
~
i
~J
'
r
~
~
'
'
~
~
~
,
'
'
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.924(In/Hr) for a 100.0 year atorm
Subarea zunoff = 4.808(CFS) for 3.200(Ac.)
Total runoff = 29.778(CFS) Total area = 17.400(Ac.)
~~9
++++++++++++++++++++++++++++++;+++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLUENCB OF MINOR STREAMS **** '
Along Main Stream number: 2 in normal etream number 1
Stream flow area = 17.400(Ac.)
Runoff from this stream = 29.778(CFS)
Time of concentration = 29.43 min.
Rainfall intensity = 1.924(In/Hr)
+++++++++++++++++++++++++t++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
*+'** INITIAL ARRA SVALUATION *+t*
Initial area flow distance = 670.000(Ft.)
Top (of initial area) elevation = 1055.200(Ft.)
Sottom (of initial area) elevation = 1047.000(Ft.)
Difference in elevation = 8.200(Ft.)
Slope = 0.oi224 s(percent)= 1.22
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.265 min.
Rainfall intensity = 2.579(In/Hr) for a 100.0 year stozm
UNDBVELOPED (poor cover) subarea
Runoff Coefficient = 0.808
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.847(CFS)
Total initial stream area = 10.000(Ac.)
Pervioue area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 114.000 to Point/Station 115.000
+'*** NATURAL CHANNSL TIM$ + SUBARBA FLOW ADDITION ****
Top of natural channei elevation = 1047.000(Ft.)
Bnd of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 1300.000(Ft.)
Batimated mean flow rate at midpoint of channel = 35.962(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.60(Ft/s)
' Correction to map slope uaed on extremely rugged channels with ~`~J
~ ~~o
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0105
~ Corrected/adjusted channel slope = 0.0105
Travel time = 6.01 min. TC = 23.28 min.
, Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
~ Runoff Coefficient = 0.794
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500. ~
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Rainfall intensity = 2.188(In/Hr) for a 100.0 year stozm
Subarea runoff = 25.189(CFS) for 14.500(Ac.)
Total xunoff = 46.036(CFS) Total area = 24.500(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
, **** CONFLUSNCS OF MINOR STRBAMS ****
Along Main Stream number: 2 in noxmal etream number 2
~ Stream flow area = 24.500(Ac.)
Runoff from this atream = 46.036(CFS)
Time of concentration = 23.28 min.
Rainfall intensity = 2.188(In/Hr)
~ Summaxy of etream data:
Stream Flow rate TC Rainfall Intensity
, No. (CFS) (min) (In/Hr)
, 1 29.778 29.43 1.924
2 46.036 23.28 2.188
Largeet stream flow hae longer or ahorter time of concentration
Qp = 46.036 + aum of
~ Qa Tb/Ta
29.778 * 0.791 = 23.553
Qp = 69.590
~ Total of 2 streams to confluence:
Flow rates before confluence point:
29.778 46.036
~ Area of streams before confluence:
17.400 24.500
Resulta of confluence:
' Total flow rate = 69.590(CPS)
Time of concentration = 23.277 min.
- Bffective stream area after confluence = 41.900(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 118.000
, **** NATURAL CHANNFL TIME + SUBARBA FLOW ADDITION ***•
Top of natural channel elevation = 1033.400(Ft.)
, Bnd of natural channel elevation = 1030.500(Ft.) ~~
~
,
'
'
'
i
~
r
~
~~I
Length of natural channel = 730.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 71.251(CFS)
Natural valley channel type uaed
L.A. County flood control district formula for channel velocity:
velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.70(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0040
Corrected/ad~usted channel slope = 0.0040
Travel time = 4.50 min. TC = 27.78 min.
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.784
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fraction
Rainfall intensity =
Subarea runoff =
Total runoff = 72.
group A = 0.000
group B = 0.500
group C = 0.500
group D = 0.000
2) = 82.00
= 1.000; Impervioue fraction = 0.000
1.986(In/Hr) for a 100.0 year storm
3.115(CFS? for 2.000(AC.)
705(CFS) Total area = 43.900(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++f+++++++++++++++++++++++
Proceae from Point/Station 118.000 to Point/Station 118.000
**** CONFLUSNCB OF MINOR STREAMS ****
' Along Main Stream number: 2 in normal atream number 1
Stream flow area = 43.900(AC.)
~ Runoff from this stream = 72.705lCFS)
Time of concentration = 27.78 min.
Rainfall intensity = 1.986(In/Hr)
' +++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 116.000 to Point/Station 117.000
~ **** INITIAL ARBA BVALUATION ***+
initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1053.900(Ft.)
^ Bottom (of initial area) elevation = 1042.300(Ft.)
~ Difference in elevation = 11.600(Ft.)
Slope = 0.01160 s(percent)= 1.16
' TC = k(0.530)~((length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.483 min.
Rainfall intensity = 2.348(In/Hr) for a 100.0 year storm
, UNDEVBIAPSD (poor cover) subarea
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
' Decimal fraction soil group C= 0.500
Decimal fraction aoil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000 ~~
, IGZ
Initial subarea runoff = 17.473(CFS)
Total initial stream area = 9.300(Ac.)
, Pervious area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 118.000
*+'t* NATURAL CHANNSL TIMB + SUHARBA FLOW ADDITION ****
' Top of natural channel elevation = 1042.300(Ft.)
Bnd of natural channel elevation = 1030.500(Ft.)
Length of natural channel = 1430 .000(Ft.) ~
' Bstimated mean flow rate at midpoint of channel = 30.625(CFS)
Natural valley channel type used
' L.A. County flood control district
Velocity(ft/s) _ (7 + 8(q(Snglish fozmula for channel velocity:
Units)"
352)(slope"0
5)
.
.
Velocity using mean channel flow = 3.06(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0083
, Corrected/adjuated channel slope = 0.0083
Travel time = 7.79 min. TC = 28.27 min.
~ Adding area flow to channel
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.983
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fractioa soil group C= 0.500
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 1.966(In/Hr) for a 100.0 year stozm
Subarea runoff = 21.567(CFS) for 14.000(Ac.)
Total runoff = 39.040(CFS) Total area = 23.300(AC.)
,
~
'
'
'
~
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 118.000
•*** CONFLUENCS OF MINOR STR$AMS ****
Along Main Stream number: 2 in noxmal stream number 2
Stream flow area ~ 23.300(AC.)
Runoff from this stream = 39.040(CFS)
Time of concentration = 28.27 min.
Rainfall inteneity = 1.966(In/Hr)
Summazy of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 72.705 27.78
2 39.040 28.27
L~argeat stream flow has longer
= 72.705 + sum of
Qa Tb/Ta
Rainfall Inteneity
(In/Hr)
1.986
1.966
or shorter time of concentration
~4~0
' 39.040 * 0.982 = 38.353
Qp = 111.058
, Total of 2 streams to confluence:
Flow rates before confluence point:
' 72.705 39.040
Area of atreams before confluence:
43.900 23.300
' Results of confluence:
Total flow rate = 111.058(CFS)
Time of concentration = 27.775 min.
Bffective stream area after confluence = 67.200(~Ac.)
'
++++++++++~+++++++++++++++++++++++++++++++++++++++++++r+++++++++++++++
' Proceae from Point/Station 118.000 to Point/Station 122.000
**** NATURAL CHANNBL TIMB + SUBARSA FLOW ADDITION **+'*
~ Top of natural channel elevation = 1030.500(Ft.)
End of natural channel elevation = 1028.000(Ft.)
Length of natural channel = 990.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 116.016(CFS)
, Natural valley channel type used
L.A. County flood control dietrict formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.49(Ft/s)
Correction to map slope used on extremely rugged channels with
, dropa and waterfalls (Plate D-6.2)
Nozmal channel slope ~_ 0.0025
Corrected/adjusted channel slope = 0.0025
~ Trave2 time = 6.61 min. TC = 34.39 min.
, Adding area flom to channel
UND$VELOPBD (poor cover) aubarea
Runoff Coefficient = 0.772
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 1.766(In/Hr) for a 100.0 year storm
Subarea runoff = 8.178(CFS) for 6.000(Ac.)
, Total runoff = 119.236(CFS) Total area = 73.200(AC.)
' +++++++++++++++++++++++++++++++++++++++++t++++++++++++++++++++++++++++
Proceas from Point/Station 122.000 to Point/Station 122.000
**** CONFLUBNCS OF MINOR STRRAMS ****
' Along Main Stream number: 2 in normal stream number 1
5tream flow area = 73.200(Ac.)
Runoff from this atream = 119.236(CFS)
, Time of concentration = 34.39 min.
Rainfall intensity = 1.766(In/Hr)
163
' ~,~
,
'
'
~
'
~
'
,
~
'
'
'
'
'
'
'
'
~
,
i~~-
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
**** INITIAL AR&A SVALUATION ****
Initial area flow diatance = 540.000(Ft.)
Top (of initial area) elevation = 1051.200(Ft.)
Bottom (of initial area) elevation = 1045.500(Ft.)
Difference in elevation = 5.700(Ft.) ,
Slope = 0.01056 e(percent)= 1.06
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 16.313 min.
Rainfall intensity = ~2.661(in/Hr) for a 100.0 year stonn
UNDEVSLOPED (poor cover) subarea
Runoff Coefficient = 0.811
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 21.575(CFS)
Total initial stream area = 10.000(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 120.000 to Point/Station 121.000
*;** NATURAL CHAHIdBL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1045.500(Ft.)
Snd of natural channel elevation = 1038.000(Ft.)
Length of natural channel = 870.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 38.188(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.33(Ft/s)
Correction to map slope used on extremely rugged channels mith
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0086
Corrected/adjusted channel siope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
Adding area flow to channel
UNDEVELOPSD (poor cover) subarea
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B~ 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000~
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Zmpervious fraction = 0.000
Rainfall intensity = 2.336(In/Hr) for a 100.0 year storm
Subarea runoff = 28.772(CFS) for 15.400(AC.)
Total runoff = 50.347(CFS) Total area = 25.400(Ac.]
Qc~
t~5
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
, **** NATURAL CHANNSL TIMB + SiJBARBA FLOW ADDITION ***•
Top of natural channel elevation = 1038.000{Ft.)
' Bnd of natural channel elevation = 1028.000(Ft.)
Length of natural channel = 1140.000(Ft.)
$atimated mean flow rate at midpoint of channel = 66.998(CFS)
~ Natural valley channel type used
L.A. County flood control district forniula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
' Velocity using mean channel flow = 3.95(Ft/s)
Correction to map slope used on extremely rugged channels with
, drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0088
Corrected/adjusted channel slope = 0.0088
Travel time = 4.81 min. TC = 25.48 min.
,
Adding area flow to channel
' UNDSVELOPED (poor cover) aubarea
Runoff Coefficient = 0.789
Decimal fraction eoil group A= 0.000
~ Decimal fraction soil group 8= 0.500
Decimal fraction aoil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pervioue area fraction = 1.000; Impervioue fraction = 0.000
Rainfall inteneity = 2.082(In/Hr) for a 100.0 year storm
Subarea runoff = 27.599(CFS) for 16.800(AC.)
' Total runoff = 77.947(CFS) Total area = 42.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Proceas from Point/Station 122.000 to Point/Station 122.000
**** CONFLU8NC8 OP MINOR STREAMS ***t
' Along Main Stream number: 2 in noxmal stream number 2
3tream flow area = 42.200(Ac.)
Runoff from this etream = 77.947(CFS)
, Time of concentration = 25.48 min.
Rainfall inteneity = 2.082{In/Hr)
Su~nary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
, 1 119.236 34.39 1.766
2 77.947 25.48 2.082
' Largest atream flow has longer time of concentration
Qp = 119.236 + sum of
Qb ia/Ib
77.947 * 0.848 = 66.102
' Qp = 185.338
Total of 2 streams to confluence:
' Flow rates before confluence point: ~~
i
41
'
'
,
'
'
119.236 77.947
Area of streame before confluence:
73.200 42.200
Results of confluence:
Total flow rate = 185.338(CFS)
Time of concentration = 34.390 min.
Sffective etream area after confluence = 115.400(AC.)
i~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
**** CONFLUBNCB OF MAIN STRSAMS **~*
The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 115.400(AC.)
Runoff from this stream = 185.338(CFS)
Time of concentration = 34.39 min.
Rainfall intensity = 1.766(In/Hr)
Summazy of stream data:
Stream Flow rate TC
' No. (CFS) (min)
,
~
I~I
~
,
'
,
'
Rainfall Intensity
(In/Hr)
1 1185.459 39.08 1.646
2 185.338 34.39 1.766
Largest atream flow has longer time of concentration
Qp = 1185.459 + sum of
Qb Ia/Ib
185.338 * 0.932 = 172.753
Qp = 1358.212
Total of 2 main streams to confluence:
Flow rates before confluence point:
1185.459 185.338
Area of streams before confluence:
720.300 115.400
Results of confluence:
Total flow rate = 1358.212(CFS)
Time of concentration = 39.080 min.
$ffective etream area after confluence
Bnd of computations, total study area =
The following figures may
be used for a unit hydrograph study of
= 835.700(AC.)
835.70 (Ac.)
the same area.
Area averaged pervious area fraction(Ap) = 1.000
, Area averaged RI inciex number = 79.3
,
~
' ~O
' Zol
Riverside County Rational Hydrology Program
' CIVILCADD/CIVILDBSIGN Sngineering Software,(c) 1989 - 2001 Version 6:4
________Rational Hydrology Study Date: 02/06/03 File:264$X.out
, ------------------------------------
-------------------------
TR 30264 BXISTING CONDITION INCLUDING OFF-SITES
100 YEAR STORM
' JN 32006
--------------------------------------------
------------------------
********* Hydz'OlOgy StUdy COIItr01 Inf0l~IldtiOn ***t***•**
' Englieh (in-lb) Units used in input data file
' -------------------------------------
-----------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
-------------------------------------------
-----=----------------------
, Rational Method Aydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
, Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curvea data (Plate D-4.1)
' For the ( Murrieta,Tlnc,Rnch CaNOrco ] area used.
10 year stozm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
' S00 year atorm 10 minute intensity = 3.480(In/Hr)
100 year storm 60 minute intenaity = 1.300(In/Hr)
Stoxm event year = 100.0
' Calculated rainfall intenaity data:
1 hour intensity = 1.300(in/Hr)
Slope of intensity duration curve = 0.5500
,
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proces8 from Pofnt/Station 100.000 to Point/Station 101.000
' * * * * INITIAL ARBA $ypiI,UATION * * r *
Initial area flom diatance = 1000.000(Ft.)
Top (of initial area) elevation = 1148.000(Ft.)
, Bottom (of initial area) elevation = 1130.300(Ft.)
Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1.77
' TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 18.823 min.
Rainfall inteneity = 2.460(in/Hr) for a 100.0 year stosm
, UNDBVSLOPBD (poor cover) aubarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
,' Pervious area fraction = 1.000; Impexvious fraction = 0.000 5~
, 20 2
Initial subarea runoff = 19.200(CFS)
Total initial stzeam area = 10.000(AC.)
, Pervious ares fraction = 1.000
1 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNBL TIM$ + SUBARSA FLOW ADDITION ****
' Top of natural channel elevation = 1130.300(Ft.)
find of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.) ~
' $etimated mean flow rate at midpoint of channel = 37.440(CFS)
Natural valley channel type used
' L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.45(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalle (Plate D-6.2)
Normal channel slope = 0.0156
' Corrected/adjuated channel slope = 0.0156
Travel time = 3.67 mi.n. TC = 22.49 min.
, Adding area flow to channel
UNDBVELOPBD (poor cover) subarea
Runoff Coefficient = 0.770
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pen+ious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.230(In/Hr) for a 100.0 year storm
' Subarea runoff = 32.632(CFS) for 19.000(AC.)
Total runoff = 51.832(CFS) Total area = 29.000(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 103.000
***' N1+T[JRAL CHANNI3L TIMS + SUBARSA FLOW ADDITION **+*
, Top of natural channel elevation = 1115.000(Ft.)
8nd of natural channel elevatioa = 1100.500(Ft.)
' Length of natural channel = 1020.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 67.203(CFS)
' Natural valley channel type used
L.A. County flood control dietrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(gnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.03(Pt/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0142
Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min.
, ~v
'
Adding area flow to channel .
, UND8i7gLOPED (poor cover) subarea
Runoff Coefficient = 0.761
'
'
1
,
'
'
'
'
,
,
'
'
,
'
,
'
1
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI inde~c for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year stozm
Subarea runoff = 27.039(CFS) for 17:200(Ac.)
Total runoff = 78.870(CFS) Total area = 46.200(Ac.)
Z~3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 303.000 to Point/Station 107.000
**** NATIJRAL CHANNgL TIMS + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1100.500(Ft.)
8nd of natural channel elevation = 1095.800(Ft.)
Length of naturai channel = 420.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 79.297(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
velocity(ft/s) _ (7 + 8(q(8nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.69(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
Corrected/adjuated channel slope = 0.0112
Travei time = 1.49 min. TC = 27.36 min.
Adding area flow to channel
UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.758
Decimal fraction
Decimal fraction
Decimal fraction
Decimal fraction
RI index for soi:
soil
soil
soil
soil
~ (AMC
group A = 0.000
group 8 = 1.000
group C = 0.000
group D = 0.000
2) = 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.002(In/Hr) for a 100.0 year stoxm
Subarea runoff = 0.758(CFS) for 0.500(AC.)
Total runoff = 79.629(CFS) Total area = 46.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUENCB OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 46.700(Ac.)
Runoff from this atream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(in/Hr)
`J`~7
' Za q.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 104.000 to Point/Station 105.000
**** INITIAL ARHA S17ALUATION ++**
~
'
'
~
~
~
~
li I
~~
,
r
~
~
~
~
~
IJ
Initial area flow distance = 785.000(Ft.)
Top (of initial area) elevation = 1147.000(Ft.?
Bottom (of initial area) elevation = 1133.000(Ft.
Difference in elevation = 14.000(Ft.)
Slope = 0.01783 s(percent)= 1.78
TC = k(0.530)t[(length"3)/(elevation change}]"0.2
Initial area time of conc2ntration = 17.060 min.
Rainfall intensity = 2.596(In/Hr) for a 100
UNDEVELOPSD (poor cover) eubarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
0 year etorm
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.410(CFS)
Total initial stream area = 10.000(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
ProCesa from Point/Station 105.000 to Point/Station 306.000
•*** NATURAL CHANNSL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1133.000(Ft.)
Bnd of natural channel elevation = 1116.000(Ft.)
Length of natural channel = 1175.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 32.655(CFS)
Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
velocity(ft/s) _ (7 + 8(q(Bnglish Unite)".352)(slope"0.5)
Velocity using mean channel flow = 4.12(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81 min.
Adding area flow to channel
UND$VSLOPBD (poor cover) aubarea
Runoff Coefficient = 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impenrious fraction = 0.000
Rainfall intensity = 2.268(In/Hr) for a 100.0 year storm
Subarea runoff = 21.013(CFS) for 12.000(Ac.)
Total runoff = 41.423(CFS) Total area = 22.000(AC.) ~~
~ Za5
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
,~ Process from Point/Station 106.000 to Point/Station 107.000
**** NATtTRAL CHANNBL TIME + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1116.000(Ft.)
t Snd of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
8etimated mean flow rate at midpoint of channel = 50.366(CFS)
~~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q($nglieh Units)".352)(slope"0.5?
Velocity using mean channel flow = 4.91(Ft/s)
' Correction to map slope used on extremely rugged channels with
drope and waterfalls tPlate D-6.2)
Nor~aal channel slope = 0.0160
Corrected/adjusted channel slope = 0.0160
~ Travel time = 4.28 min. TC = 26.08 min.
~, P,dding area flow to channel
~ UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.761
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction eoil group D= 0.000
~ RI index for soil(AMC 2) = 78,00
Pervious area fraction = 1.000; Impervioue fraction = 0.000
Rainfall intensity = 2.056(In/Hr) for a 100.0 year atorm
~ Subarea runoff = 14.857(CFS) for 9.500(Ac.)
~ Total runoff = 56.279(CFS) Total area = 31.500(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
***~ CONFLUSNC$ OF MINOR STRfiAMS ****
~,~ Along Main Stream number: i in normal stream number 2
Stream flow area = 31.500(Ac.)
~ Runoff from thie stream = 56.279(CFS)
Time of concentration = 26.08 min.
Rainfall intensity = 2.056(In/Hr)
~ Su~nary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (in/Hr)
~ 1 79.629 27.36 2.002
O 2 56.279 26.08 2.056
L~argest stream flow has longer time of concentration
79.629 + sum of
Qb Ia/Ib
~ 56.279 * 0.974 = 54.815
Qp = 134.443
/
~ Total of 2 atreams to confluence: 5~
, 206
Flow rates before confluence point:
79.629 56.279
~ Area of streams before confluence:
46.700 31.500
Reaults of confluence:
Total flow rate = 134.443(CFS)
r, Time of concentration = 27.365 min.
Effective stream area after confluence = 78.200(AC.)
v ++++++++++++t+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process•from Point/Station 107.000 to Point/Station 110.000
~ **** NATURAL CHANNBL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1095.800(Ft.)
' Snd of natural channel elevation = 1087.500(Ft.)
Length of natural channel 910.000(Ft.)
Eatimated mean flow rate at midpoint of channel = 143.899(CFS)
~ Natural valley channel type used
L.A. County flood control district fornrula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(gngliah Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.06(Ft/s)
~ Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
' Noxmal channel slope = 0.0091
Corrected/adjusted channel siope = 0.0091
Travel time = 3.00 min. TC = 30.36 min.
~ Adding area flow to channel
UNDBVSLOPBD (poor cover) subarea
•~ Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.891(In/Hr) for a 500.0 year atonn
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
~ Total runoff a 150.057(CFS) Total area = 89.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 110.000 to Point/Station 110.000
~ **** CONFLUSNCB OF MINOR STRBAMS ****
~ Along Main Stream number: 1 in nomlal stream number 1
Stream flow area = 89.200(AC.)
Runoff from this stream = 150.057(CFS)
Time of concentration = 30.36 min.
~ Rainfall intenaity = 1.891(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL ARBA SVALUATION **** d4
J
~'
~ Initial area flow distance = 710.000(Ft.)
Top (of initial area) elevation = 1112.000(Ft.)
~ sottom (of initial area) elevation = 1100.000(Ft.)
Difference in elevation = 12.000(Ft.)
Slope = 0.01690 s(percent)= 1.69
~ TC = k(0.530)*[(length"3)/~elevation change)]"0.2
Initial area time of concentration = 16.565 min.
Rainfall intensity = 2.639(In/Hr) for a 100.0 year stozm
~ UNDSVELOP$D (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraetion soil group B= 1.000
~ Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
~ initial subarea runoff = 17.875(CFS)
Total initial stream area = 8.600(AC.)
~ Pervious area fraction = 1.000
co7
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/SCation 109.000 to Point/Station 110.000
~~ **** NATURAL CHANNBL TIMS + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1100.000(Ft.)
,~ Snd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030 .000(Ft.)
Sstimated mean flow rate at midpoint of channel = 25.046(CFS)
~
Natural valley channel type used
L.A. County flood control diatrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 3.51(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0121
Corrected/adjusted channel alope = 0.0121
Travel time = 4.89 min. TC = 21.46 min.
~ Adding area flow to channel
UNDEVSLOPRD ipoor cover) subarea
Runoff Coefficient = 0.773
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
'' Pezvious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.289(In/Hr) for a 100.0 year storm
~ Subarea runoff = 12.206(CFS) for 6.900(Ac.)
Total runoff = 30.081(CFS) Total area = 15.500(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 110.000 to Point/Station 110.000
**** CONFLUSNCS OF MINOR STRIIAMS **** ~-~
;~,
~ 20$
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 15.500(Ac.)
;~ Runoff from this stream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall intenaity = 2.289(In/Hr)
Summary of stream data:
~ Stream Flom rate TC Rainfall Intensity
~ No. (CFS) (min) (In/Hr)
1 150.057 30.36 1.891
2 30.081 21.46 2.289
Largest stream flow has longer time of concentration
Qp = 150.057 + sum of
Qb Sa/ib
~~ 30.081 * 0.826 = 24.853
Qp = 174.910
~ Total of 2 streams to confluence:
Flow rates before confluence point:
150.057 30.081
1 Area of streams before confluence:
89.200 15.500
Results of confluence:
~ Total flow rate = 174.910(CFS)
Time of concentration = 30.362 min.
Bffective stream area after confluence = 104.700(Ac.)
!~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point%Station 110.000 to Point/Station 123.000
~ **+* NATURAL CHANNBL TIMS + SUBARBA FLOW ADDZTION **+•
Top of natural channel elevation = 3087.500(Ft.)
Snd of natural channel elevation = 1083.500(Ft.)
i~ Length of natural channel = 675.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 189.778(CFS)
c Natural valley channel type used
,~ L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) ~ (7 + 8(q(Snglish Units)".352)(slope"0.5)
velocity ueing mean channel flow = 4.44(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0059
~' Corrected/adjusted channel alope = 0.0059
Travel time = 2.53 min. TC = 32.89 min.
~ Adding area flow to channel
~ UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
DeCimal fraction soil group 8= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) _'78.00 L~
Pervious area fraction = 1.000; Impervious fraction = 0.000 J
~'
2e9
~ Rainfall intensity = 1.809(In/Hr) for a 100.0 year storm
,~ Subarea runoff = 23.997(CFS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(Ac.)
~ +++t++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUSNCB OF MAIN STRSAMS ****
~ The following data inside Main Stream is lieted:
In Main Stream number: 1
Stream flow area = 122.500(Ac.)
Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intensity = 1.809(in/Hr)
~ Program is now atarting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 111.000 to Point/Station 112.000
**** INITIAL ARSA BVALUATION ****
~ Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1143.000(Ft.)
Bottom (of initial area) elevation = 1135.300(Ft.)
~ Difference in elevation = 7.700(Ft.)
Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 14.668 min.
~ Rainfall intensity = 2.821(In/Hr) for a 100.0 year storm
UNDSVELOPI3D (poor cover) subarea
Runoff Coefficient = 0.815
Decimal fraction soil group A= 0.000
~rj Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.00
Pervious area fraction = 1.000; Impexvious fraction = 0.000
Initial aubarea runoff = 23.004(CFS)
~ Total initial stream area = 10.000(AC.)
' Pervious area fraction = 1.000
~ +++++++++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++~
~ Process from Point/Station 112.000 to Point/Station 113.000
r *+** NATURAL CHANNBL TIME + SUBARSA FLOW ADDITION ****
~ Top of natural channel elevation = 1135.300(Ft.)
Snd of natural channel elevation = 1122.800(Ft.)
Length of natural channel = 810.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 44.858(CFS)
~ Natural valley channel type used
L.A. County flood control district forntula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.66(Ft/s)
~ Correction to map slope used on extremely rugged channela with ~
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0154
~'
1 Zlo
' Corrected/adjusted channel slope = 0.0154
~ Travel time.= 2.90 min. TC = 17.56 min.
Adding area flow to channel
UNDBVBLOPBD (poor cover) subarea
~. Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
; Decimal fraction soil group B= 0.500
Decimal fraction aoil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.555(In/Hr) for a 100.0 year stoxm
Subarea runoff = 39.199(CFS) for 19.000(Ac.)
Total xunoff = 62.203(CFS) Total area = 29.000(Ac.)
~.
~ +++++++++~++~~++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CHANNEL TIMS + SUBARBA FLOW ADDITION ****
~ Top of natural channel elevation = 1122.600(Ft.)
Bnd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
~ 8stimated mean flow rate at midpoint of channel = 82.580(CFS)
Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + B(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.75(Ft/s)
~ Correction to map slope used on extremely rugged channels with
~ drops aad waterfalis (Plate D-6.2)
Normal channel slope = 0.0112
Corrected/adjusted channel slope = 0.0112
f Travel time = 3.68 min. TC = 21.25 min.
Adding area flow to channel
,~ UNDEVSLOPED (poor cover) subarea
Runoff Coefficient = 0.774
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
' Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.301(In/Hr) for a 100.0 year storm
Subarea runoff = 33.820(CFS) for 19.000(AC.)
~ Total runoff s 96.023(CFS) Total area = 48.000(Ac.)
~ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~++++++++
Procesa from Point/Station 114.000 to Point/Station 114.000
**** CONFLUBNCB OF MINOR STRSAMS ****
;' Along Main Stream number: 2 in nornial stream number 1
Stream flom area = 48.000(AC.) ~p
,~ Runoff from thie stream = 96.023(CFS)
Z If
~ Time of concentration = 21.25 min.
~ Rainfall intenaity = 2.301(In/Hr)
+++++++++++++++++++++++++++++~+++++++++++++++++t++++++++++++++++++++++
~ Process from Point/Station 115.000 to Point/Station 115.000
**** USSR DBFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.017(In/Hr) for a 100.0 year atonn
,~~ UNDSVELOPI3D (poor cover) subarea
Runoff Coefficient = 0.813
Decimal fraction soil group A= 0.000 ~
Decimal fraction soil group B= 0.000
~ Decimal fraction soil group C= 1.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 86.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are ae follows:
~ TC = 27.00 min. Rain intensity = 2.02(In/Hr)
Total area = 469.20tAc.) Total runoff = 663.00(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 116.000
° **** IMPROVSD CHANNBL TRAVF3L TIMS ****
~ Upatream point elevation = 1133.000(Ft.)
Downetream point elevation = 1106.500(Ft.)
Channel length thru subarea = 1960.000(Ft.)
~ Channel base width = 10.000(Ft.)
Slope or 'Z~ of left channel bank = 4.000
Slope or 'Z' of right channel 2iank = 3.000
Batimated mean flow rate at midpoint of channel = 677.272(CFS)
~1 Manning's 'N' = 0.030
Maximum depth of channel = 7.000(Ft.)
Flow(q) thru subarea = 677.272(CFS)
~ Depth of flow = 3.319(Ft.), Average velocity = 9.442(Ft/s)
Channel flow top width = 33.230(Ft.)
Flow Velocity = 9.44(Ft/s)
~ Travel time = 3.46 min.
Time of concentration = 30.46 min.
~ Sub-Channel No. i Critical depth = 3.531(Ft.)
~ ' ' Critical flow top midth = 34.719(Ft.)
~ ~ ' Critical flow velocity= 8.578(Ft/s)
' ' ' Critical flow area = 78.957iSq.Ft)
'~ Adding area flow to channel
UNDSVBLOPSD (poor cover) subarea
~ Runoff Coefficient = 0.782
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.450
~ Decimal fraction soil group C= 0.550
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.40
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.887(In/Hr) for a 100.0 year etorm
Subarea runoff = 29.815(CFS) for 20.200(AC.)
Total runoff = 692.815(CFS) Total area = 489.400(AC.) `
,~ ~
Z~z
1
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUSNCE OF MINOR STREAMS ****
, Along Main Stream number: 2 in normal stream number 2
~ Stream flow area = 489.400(Ac.)
Runoff from this stream = 692.815(CFS)
Time of concentration = 30.46 min.
~ Rainfall intensity = 1.887(In/Hr)
` Summary of stream data:
~ Stream Flom rate TC Rainfall intensity
No. (CFS) (a-in) (In/Hr)
,~ 1 96.023 21.25 2.301
2 692.815 30.46 1.887
Largest stream flow has longer time of concentration
= 692.815 + sum of
~ ~ Qb Ia/ib
96.023 * 0.820 = 78.765
t Qp = 771.580
, Total of 2 streams to confluence:
Flow ratea before confluence point:
~ 96.023 692.815
~ Area of atreama before confluence:
48.000 489.400
,. Results of confluence:
~ Total flow rate = 771.580(CFS)
Time of concentration = 30.460 min.
Bffective stream area after confluence = 537.400(Ac.)
~
,~.
.t
~
~l
.
l
~
1
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 123.000
**** IMPROVSD CHANNSL TRAVBL TIMS ****
Upstream point elevation = 1106.500(Ft.)
Downstream point elevation = 1083.500(Ft.)
Channel length thru subarea = 1970.000(Ft.)
Channel base width = 25.000(Ft.)
Slope or 'Z~ of left channel bank = 15.000
Slope or ~Z' of right channel bank = 2.000
Satimated mean flow rate at midpoint of channel = 779.046(CFS?
Manning's 'N' = 0.030
Maximum depth of channel = 2.500(Ft.)
Plow(q) thru subarea = 779.046(CFS)
Depth of flow = 2.352(Ft.), Average velocity = 7.361(Ft/s)
Channel flow top width = 64.988(Ft.)
Flow Velocity = 7.36(Ft/s)
Travel time = 4.46 min.
Time of concentration = 34.92 min.
Sub-Channel No. i Critical depth =
~ ~ ' Critical flow
~ ~ ' Critical flow
~ ~ ' Critical flow
2.375(Ft.
top width =
velocity=
area = 107
65.375(Ft.)
.259(Ft/s)
320(Sq.Ft)
~ ~~
;;
f1:
~ Adding area flow to channel
UNDEVBLOPSD (poor cover) subarea
' Runoff Coefficient = 0.741
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
DeCimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pexvious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.751(In/Hr) for a 100.0 year stoxm
Subarea runoff = 13.490(CPS) for 10.400(Ac.)
Total runoff = 785.070(CFS) Total area = 547.800(Ac.)
'
+++++++++++++++++++++++++++++++++++++++++++++++t++++++++++++++++++++++
~ Procese from Point/Station 123.000 to Point/Station 123.000
**** CONFLUSNCB OF MAIN STRSAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 547.800(Ac.)
Runoff from this stream = 785.070(CFS)
~ Time of concentration = 34.92 min.
Rainfall intensity = 1.751(In/Hr)
Program is now starting with Main Stream No. 3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 117.000
~ **** USSR DSFINSD FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.617(In/Hr) for a 100.0 year storm
SINGLB FAMILY (1/4 ACre Lot)
~ Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction aoil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
~ Pervious area fraction = 0.500; Impervious fraction = 0.500
Uaer epecified valuea are as follows:
TC = 16.82 min. Rain inteneity = 2.62(In/Hr)
~ Total area = 62.70(AC.) Total runoff = 129.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~' Process from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNBL TIMB + SUBARBP, FLOW ADDITION ****
Top of natural channel elevation = 1118.000(Ft.)
~ Bnd of natural channel elevation = 1101.000(Ft.)
Length of natural channel = 790.000(Ft.)
Estimated mean flow rate at midpoint of channel = 138.258(CFS)
'
Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5?
~ Velocity using mean channel flow = 7.68(Ft/s)
Z13
~ Correction to map slope uaed on extremely rugged channels with ~~j
~ drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0215
, Corrected/adjusted channel slope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
~. Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
~ Runoff Coefficient = 0.782
Decimal fraction Boil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000 '
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pexvious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.480(In/Hr) for a 100.0 year etoxm
Subarea runoff = 17.447(CFS) for 9.000(AC.)
Total runoff = 146.447(CFS) Total area = 71.700(AC.)
214
++++++++++++++~++++++++++++t++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 121.000
**** NATURAL CHANNSL TIMB + SIIBARSA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
Snd of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 980.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 156.251(CFS)
Natural valley channel type used
L.A. County flood control diatrict fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.63(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0107
Corrected/adjueted channel slope = 0.0107
Travel time = 2.90 min. TC = 21.44 min.
Adding area flow to channel
UNDEVRLOPBD (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.290(In/Hr) for a 100.0
Subarea runoff = 16.992(CFS) for 9.600(AC.)
Total runoff = 163.439(CFS) Total area = 81
= 0.000
year storm
300(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUffiiCB OF MINOR STRSAMS ****
Along Main Stream number: 3 in normal stream number 1 ~p~
2~5
~ Stream flow area = 81.300(Ac.)
Runoff from this stream = 163.439(CFS)
~ Time of concentration = 21.44 min.
Rainfall intensity = 2.290(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
~ **** INITIAL ARfiA BVALUATION ****
Initial area flow distance = 920.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.) ~
~ Bottom (of initial area) elevation = 1094.000(Ft.)
Difference in elevation = 66.000(Ft.)
Slope = 0.07174 s(percent)= 7.17
~ TC = k(0.480)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 12.462 min.
Rainfall intensity = 3.086(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1 Acre Lot)
I Runoff Coefficient = 0.718
Decimal fraction soil group A~ 0.000
Decimal fraction soil group B= 1.000
1 Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
~ Pervious area fraction = 0.800; Impervious fraction = 0.200
Initial subarea runoff = 7.085(CFS)
. Total initial stream area = 3.200(Ac.)
Pervioua area fraction = 0.800
++++++++++++++++++++++++++++++++++++++++++++++++t+++++++++++++++++++++
~ Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNBL TZMS + SUBARSA FLOW ADDITION *~**
Top of natural channel elevation = 1094.000(Ft.)
'~ End of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
8stimated mean flow rate at midpoint of channel = 9.520(CFS)
~ Natural valley channel type used
L.A. County flood control diatrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngliah Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 1.95(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalla (Plate D-6.2)
Nox~al channel slope = 0.0063
Corrected/adjuated channel slope = 0.0063
~ Travel time = 4.78 min. TC = 17.25 min.
Adding area flow to channel
~ UNDSVSLOPED (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
,, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00 (D5/
~
,
~
~
~
~
I
L
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(In/Hr) for a 100.0 year stonn
Subarea runoff = 4.460(CFS).for 2.200(AC.)
Total runoff = 11.545(CFS) Total area = 5.400(Ac.)
ZI~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
*~** CONFLUSNCS OF MINOR STRI3AMS ****
Along Main Stream number: 3 in nozmal stream number 2
Stream flow area = 5.400(Ac.)
Runoff fran this stream = 11.545(CFS)
Time of concentration = 17.25 min.
Rainfall intenaity = 2.581(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 163.439 21.44
2 11.545 17.25
Largest stream flow has longer
Qp = 163.439 + sum of
Qb Ia/Ib
11.545 * 0.887 =
Qp = 173.682
2.290
2.581
time of concentration
10.243
~ Total of 2 streams to confluence:
Flow rates before confluence point:
163.439 11.545
' Area of streama before confluence:
81.300 5.400
- Results of confluence:
Total flow rate = 173.682(CFS)
Time of concentration = 21.438 min.
. I3ffective atream area after confluence
LJ
~
'
~
~
86.700(AC.)
+++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++
Procese from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNBL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1090.500(Ft.)
$nd of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.)
Batimated mean flow rate at midpoint of channel = 192.512(CFS)
Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.93(Ft/s)
Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0046
Corrected/adjusted channel slope = 0.0046
Travel time = 3.14 min. TC ~ 24.58 min.
~e~
~ 2~~
~ Adding area flow to channel
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.765
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 2.124(In/Hr) for a 100.0 year etorm
Subarea runoff = 30.531(CFS) for 18.800(Ac.)
~ Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
*+** NATURAL CHANNSL TIMS + SUBARSA FLOW ADDITION ****
~ Top of natural channel elevation = 1087.100(Ft.)
Snd of na[ural channel elevation = 1083.500(Ft.)
~ Length of natural channel = 1360.000(Ft.)
Satimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type uaed
~ L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngliah Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.08(Ft/s)
~ Correction to map slope used on extremely rugged channels with
-- drops and waterfalls (Plate D-6.2>
Noxmal channel slope = 0.0026
I Corrected/adjusted channel slope = 0.0026
Travel time = 7.36 min. TC = 31.94 min.
~ Adding area flow to channel
UND8v8LOPBD (poor cover) subarea
~ Runoff Ccefficient = 0.747
Decimal fraction soil group A= 0.000
Decimal fraction soil group s= 1.000
Decimal fraction soil group C= 0.000
1 Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.839(In/Hr) for a 100.0 year stozm
Subarea runoff = 12.915(CFS) for 9.400(AC.)
Total runoff = 21'7.127(CFS) Total area = 114.900(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
~ **** CONFLUBNCS OF MAIN STRfiAMS ****
The following data inside Main Stream is listed:
~ In Main Stream number: 3
Stream flow area = 114.900(Ac.)
Runoff from this stream = 217.127(CFS)
TifiE of concentration = 31.94 min. ~'`
~ Rainfall intensity = 1.839(In/Hr)
~ Sunanary of stream data:
~ Stream Flow rate
No. (CFS)
i
~
LJ
~
~
~
~
~
~
M
~
~
TC Rainfall Intensity
(min) (In/Hr)
1 198.907 32.89 1.809
2 785.0'IO 34.92 1.751
3 217.127 31.94 1.839
Largest stream flow has longer time of concentration
Qp = 785.070 + sum of
Qb Ia/Ib
198.907 +' 0.968 = 192.474
Qb Ia/ib
217.127 * 0.952 = 206.732
Qp = 1184.275
Total of 3 main streams to confluence:
Plow ratea before confluence point:
198.907 785.070 217.127
Area of streams before confluence:
122.500 547.800 114.900
Resul ts of confluence:
Total flow rate = 1184.275(CFS)
Time of concentration = 34.920 min.
Sffec tive stream area after confluence = 785.200(Ac.)
2($
+++++++++++++++++++++++++++++t+++++++++++++++++++++++++++++++~++++++++
Process from Point/Station 123.000 to Point/Station 129.000
**** IMPROVSD CHANNSL TRAVEL TIMB ****
Upstream point elevation = 1083.500(Ft.)
Downstream point elevation = 1061.500(Ft.)
Channel length thru subarea = 910.000(Ft.?
Channel base width = 4.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Satimated mean flow rate at midpoint of channel = 1186.915(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 1186.915(CFS)
Depth of flow = 5.310(Ft.), Average velocity = 15.291(Ft/s)
Channel flow top width = 25.238(Ft.)
Flow Velocity = 15.29(Pt/s)
Travel time = 0.99 min.
Time of concentration = 35.91 min.
Sub-Channel No. 1 Critical depth = 6.438(Ft.)
' ' ' Critical flow top width = 29.750(Ft.)
~ ~ ~ Critical flow velocity= 10.926(Ft/s)
~ ~ ~ Critical flow area = 108.633(Sq.Ft)
Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.739
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
(¢g'
~ 2~9
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 1.724(In/Hr) for a 100.0 year storm
~ Subarea runoff = 4.458(CFS) for 3.500(Ac.)
Total runoff = 1188.734(CFS) Total area = 788.700(AC.)
t. ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- Process from Point/Station 129.000 to Point/Station 129.000
**~* CONFLUSNCB OF MAIN STRfiAMS ****
~ The following data inaide Main Stream is listed:
in Main Stream number: 1
~ Stream flow area = 788.700(Ac.)
_ Runoff from this stream = 1188.734(CFS)
Time of concentration = 35.91 min.
Rainfall intenaity = 1.724(In/Hr)
~' Program is now etarting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 124.000
**** INITIAL ARBA SVALUATION ****
~ Initial area flow diatance = 860.000(Ft.)
' Top (of initial area) elevation = 1160.000(Ft.)
I Bottom (of initial area) elevation = 1088.000(Ft.)
Difference in elevation = 72.000(Ft.)
Slope = 0.08372 s(percent)= 8.37
TC = k(0.530)*[(length"3)/(elevation change)J"0.2
~ Initial area time of concentration = 12.987 min.
Rainfall intenaity = 3.016(In/Hr) for a 100.0 year stoxm
UNDEVSLOPSD (poor cover) subarea
~ Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction ~ 1.000; impervious fraction = 0.000
~ Initial subarea runoff a 7.724(CFS)
Total initial stream area = 3.200(Ac.)
Pervioue area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
~ **** IMPROVSD CHANNSL TRAVSL TIMB ****
Upstream point elevation = 1088.000(Ft.)
~ Dovmstream point elevation = 1079.000(Ft.)
Channel length thru subarea = 390.000(Ft.)
Channel base width = 17.000(Ft.)
~ Slope or ~Z~ of left channel bank = 2.000
Slope or ~z~ of right channel bank = 5.000
Betimated mean flow rate at midpoint of channel = 8.690(CFS)
Manning~s 'N' = 0.030 ~0.
, Maximum depth of channel = 1.000(Ft.)
' 22 a
Flow(q) thru subarea = 8.690(CFS)
~ Depth of flow = 0.198(Ft.), Average velocity = 2.484(Ft/s)
Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
^ Time of concentration = 15.60 min.
Sub-Channel No. 1 Critical depth = 0.199(Ft.)
~ ~ ' ' Critical flow top width = 18.395(Ft.)
~ ' ' Critical flow velocity= 2.465(Ft/s)
~ ~ ~ Critical flow area = 3.526(Sq.Ft)
~ Adding area flow to channel
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.791
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.727(In/Hr) for a 100.0 year storm
~ Subarea runoff = 1.725(CFS) for 0.800(Ac.)
Total runoff = 9.450(CFS) Total area = 4.000(AC.)
~' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Procesa from Point/Station 125.000 to Point/Station 125.000
~ **** CONFLUBNCI3 OF MINOR STRSAMS ****
Along Main Stream.number: 2 in normal stream number 1
Stream flow area = 4.000(Ac.)
~ Runoff from this stream ~ 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall inteneity = 2.727(In/Hr)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 125.000 to Point/Station 125.000
~ **** US&R DBFINBD FIAW INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Hr? for a 100.0 year storm
, SINGLB FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
~ Decimai fraction soil group B= 0.400
Decimal fraction soil group C= 0.600
Decimal fraction soil group D= 0.000.
RI index for soil(AMC 2) = 63.80
Pervious area fraction = 0.500; Impervious fraction = 0.500
User epecified values are as follows:
TC = 25.00 min. Rain intensity = 2.10(In/Hr)
~ Total area = 118.00(Ac.) Total runoff = 293.20(CFS)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
***~ CONFLUSNCB OF MINOR STREAMS ****
~ Along Main Stream number: 2 in normal stream number 2 ~o
~~
~
~
~
~
~
~
~
~
~
~
~
~
'
~
Stream flow area = 118.000(Ac.)
Runoff from this stream = 293.200(CFS)
Time of concentration = 25:00 min.
Rainfall intensity = 2.104(In/Hr)
Sutt¢nary of etream data:
Stream Flom rate TC
No. (CFS) (min)
1 9.450 15.60
2 293.200 25.00
L~argest stream flow has longer
= 293.200 + sum of
Qb Ia/Ib
9.450 * 0.772 =
Rainfall intensity
(In/Hr)
2.727
2.104
time of concentration
Qp = 300.492
7.292
Total of 2 streams to confluence:
Flow rates before confluence point:
9.450 293.200
Area of streams before confluence:
4.000 118.000
Reaults of confluence:
Total flow rate = 300.492(CFS)
Time of concentration = 25.000 min.
I3ffective atream area after confluence = 122.000(AC.)
?21
++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 125.000 to Point/Station 126.000
**** IMPROVSD CHANNBL TRAVSL TIMS +'+**
Upstream point elevation = 1079.000(Ft.)
Downstream point elevation = 1073.700(Ft.)
Channel length thru subarea = 870.000(Ft.)
Channel base wid[h = 5.000(Ft.)
Slope or ~Z~ of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
8stimated mean flow rate at midpoint of channel = 319.211(CFS)
Manning~s ~N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru eubarea = 319.211(CFS) ~
Depth of flow = 3.059(Ft.), Average velocity = 5.561(Ft/s)
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Ft/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
Sub-Channel No. 1 Critical depth = 2.656(Ft.)
' ' ' Critical flow top width = 28.906(Ft
' ' ' Critical flow velocity= 7.089(Ft/s)
' ' ' Critical flom area = 45.032(Sq.Ft)
Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.757
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~~
~ 222
Decimal fraction soil group D= 0.000
1 RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.992(In/Hr) for a 100.0 year stonn
Subarea runoff = 22.927(CFS) for 15.200(Ac.)
~ Total runoff = 323.419(CFS) Total area = 137.200tAC.?
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 126.000 to Point/Station 127.000
**** IMPROVSD CHANNSL TRAVEL TIMB ****
~ Upstream point elevation = 1073.700(Ft.)
Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
~ Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
~ Sstimated mean flow rate at midpoint of channel = 341.099(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 341.099(CFS)
~ Depth of flow = 3.846(Ft.), Average velocity = 3.976(Ft/s)
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
~ Travel time = 2.47 min.
Time of concentration = 30.08 min.
~ Sub-Channel No. 1 Critical depth = 2.750(Ft.)
~ ' ' Critical flow top width = 29.750(Ft
~ ' ' Critical flow velocity= 7.139(Ft/s)
~ ~ ' Critical flow area = 47.781(Sq.Ft)
~ Adding area flow to channel
UND8V8LOPSD (poor cover) subarea
' Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2y 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 1.900(In/Hr) for a 100.0 year stoxm
Subarea runoff = 21.418(CFS) for 15.000(AC.)
Total runoff = 344.837(CFS) Total area = 152.200(Ac.)
i ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
' ***• IMPROVBD CHANNSL TRAVF3L TIMS ****
Upstream point elevation = 1072.300(Ft.)
~ Downstream point elevation = 1068.900(Ft.)
Channel length thru subarea = 620.000(Ft.)
Channel base width = 20.000(Ft.)
Slope or 'Z' of left channel bank = 4.000
,' Slope or 'Z' of right channel bank == 40.000
Betimated mean flow rate at midpoint of channel = 359.564(CFS)
Manning~s 'N' = 0.030
~ Maximum depth of channel = 6.000(Ft.) ,~v
~ Flow(q) thru subarea = 359.564(CFS)
~ Depth of flow = 1.690(Ft.), Average velocity = 3.721(Ft/s)
Channel flow Cop width = 94.361(Ft.)
Flow Velocity = 3.72(Ft/s)
Travel time = 2.78 min.
~ Time of concentration = 32.86 min.
Sub-Channel No. 1 Critical depth = 1.367(Ft.)
' ~ ~ ' Critical flow top width = 80.156(Ft.)
~ ~ ' Critical flow velocity= 5.252(Ft/s)
~ ~ ~ Critical flow area = 68.466(Sq.Ft)
~ Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.745
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.810(In/Hr) for a 500.0 year stonn
Subarea runoff = 17.538(CFS) for 13.000(AC.)
Total runoff = 362.376(CFS) Total area = 165.200(Ac.)
~
~
~
~
?23
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
**** IMPROVSD CHANNBL TRAVEL TIME *+**
Upetream point elevation = 1068.900(Ft.)
Downatream point elevation = 1061.500tFt.)
Channel length thru subarea = 750.000(Ft.)
Channel base width = 10.000(Ft.)
Slope or ~Z~ of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Bstimated mean flow rate at midpoint of channel = 377.731(CFS)
Manning~e 'N~ = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 377.731(CFS)
Depth of flow = 2.986tFt.), Average velocity = 7.920(Ft/s)
Channel flow top width = 21.944(Ft.)
, Flow Velocity = 7.92(Ft/s)
Travel time = 1.58 min.
Time of concentration = 34.44 min.
~
~
~
,
~
Sub-Channel No. 1 Critical depth =
~ ~ ' Critical flow
~ ~ ~ Critical flow
~ ~ ' Critical flow
Adding area flow to channel
UNDEVBLOPBD (poor cover) subarea
Runoff Coefficient = 0.742
Decimal fraction soil group
Decimal fraction soil group
Decimal fraction soil group
Decimal fraction soil group
RI index for soil(AMC 2) _
Pervious area fraction = i
2.906(Ft
top width =
velocity=
area =
A = 0.000
B = 1.000
C = 0.000
D = 0.000
78.00
000; Impervious
21.625(Ft.)
8.220(Ft/s)
45.955tSq.Ft)
fraction = o.ooo .~3
~ Z2~.
Rainfall intensity = 1.764(In/Hr) for a 100.0 year etorm
~ Subarea runoff = 18.324(CPS) for 14.000(Ac.)
Total runoff = 380.700(CFS) Total area = 179.200(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
•*** CONFLUBNC$ OF MAIN STRIIAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 2
' Stream flow area = 179.200(Ac.)
Runoff from this atream = 380.700(CFS)
Time o€ concentration = 34.44 min.
Rainfall intenaity = 1.764(In/Hr)
~ Program is now starting with Main Stream No. 3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
+*+-* USSR DSFINBD FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 2.787(In/Hr) for a 100.0 year storm
COdM9BRCIAL subarea type
Runoff Coefficient = 0.875
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; impervious fraction = 0.900
User specified values are as follows:
~ TC = 15.00 min. Rain inteneity = 2.79(In/Hr)
Total area = 87.00(Ac.) Total runoff = 108.00(CFS)
' ++++++++++++++++++++++++++++++++t+++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 129.000 to Point/Station 129.000
**** CONFLUSNCB OF MAIN STRfiAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 3
~ Stream flow area = 87.000(Ac.)
Runoff from this atream = 108.000(CFS)
~ Time of concentration = 15.00 min.
~ Rainfall inteneity = 2.787(In/Hr)
Sun¢nary of stream data:
Stream Flow rate TC Rainfall Intensity
~ No. (CFS) (min) (In/Hr)
~
'
L
1 1188.734 35.91 1.724
2 380.700 34.44 1.764
3 108.000 15.00 2.787
Largest stream flow hae longer time of concentration
Qp = 1188.734
Qb
380.700
Qb
+ sum of
Ia/Ib
* 0.977 =
Ia/ib
372.013
~~
225
108.000 * 0.619 = 66.817
Qp = 1627.564
Total of 3 main streams to confluence:
Flow rates before confluence point:
1188.734 380.700 108.000
Area of streams before confluence:
788.700 179.200 87.000
Reaults of confluence:
Total flow rate = 1627.564(CFS)
Time of concentration = 35.912 min.
Bffective stream area after confluence = 1054.900(Ac.)
$nd of computations, total study area = 1054.90 (Ac.)
The following figures may
be used for a unit hydrograph etudy of the same area.
Area averaged pervious area fraction(Ap) = 0.840
Area averaged RI index number = 77.0
~~
1
1
1
~
1
~
~
~
~
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~
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~
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Riverside County Rational Hydrology Program
, CIVILCADD/CIVSLDBSIGN Sngineeririg Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study -__Date: 02/06/03 File:798SX.out
~ -------- -------------------------- ----------------------------
TR 29798 B7CISTING CONDITION INCLUDING OFF-SZTS (NO DSTBNTION)
100 YSAR STORM
, JN 32006
------------------------------------------------------------------------
~ **~****** Hydrology Study Control Infozmation ***+**~*+*
Bnglish (in-lb) Units used in input data file
, ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
, Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Stoxm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
, For the [ Murrieta,Tmc,Rnch CaNorco ) area used.
10 year storm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
~ 100 year atorm 10 minute intensity = 3.480(In/Hr)
100 year storm 60 minute intensity = 1.300(In/Hr)
Storm event year = 100.0
~ Calculated rainfall intenaity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500 ~
~
1 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 100.000 to Point/Station 101.000
~ **** INITIAL AREA SVALUATION ****
Initial area flow distance = 765.000(Ft.)
, Top (of initial area) elevation = 1084.000(Ft.)
sottom (of initial area) elevation = 1067.500(Ft.)
Difference in elevation = 16.500(Ft.)
Slope = 0.02157 s(percent)= 2.16
~ TC = k(0.530)*[(length"3)/(elevation change))"0.2
Initial area time of concentration = 16.255 min.
Rainfall intensity = 2.666(In/Hr) for a 100.0 year stoxm
' UNDSVBLOPBD (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000 ~~
~ 252
Initial subarea runoff = 21.029(CFS)
' Total initial stream area = 10.000(AC.)
Pervious area fraction = 1.000
~ +++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNSL TIME + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1067.500(Ft.)
$nd of natural channel elevation = 1055.700(Ft.)
' Length of natural channel = 1255.000lFt.)
Sstimated mean flow rate at midpoint of channel = 37.643fCFS)
Natural valley channel type uaed
, L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.46(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2?
Normal channel slope = 0.0094
' Corrected/adjusted channel elope,= 0.0094
Travel time = 6.04 min. TC = 22.30 min.
~
,
~
'
,
~
~
,
'
Adding area flow to channel
UNDSVIIIAPBD (poor cover) subarea
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
Decimal fraction soil group B.= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soiltAblC 2) = 78.00
Pervious area fraction = 1.000; Impezvious fraction = 0.000
Rainfall intensity = 2.241(In/Hr) for a 100.0 year storm
Subarea runoff = 27.283(CFS) for 15.800(Ac.)
Total runoff = 48.312(CFS) Total area = 25.800(AC.)
++++t+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.
Process from Point/Station 102.000 to Point/Station 103.000.
***• NATURAL CHANNSL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1055.700(Ft.)
8nd of natural channel elevation = 1055.000(Ft.)
Length of natural channel = 370.000(Ft.)
Estimated mean flow rate at midpoint of channel = 66.102(CFS)
Natural valley channel type uaed
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean cHannel flow = 1.83(Ft/s)_
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0019
Corrected/adjusted channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min.
~~
'
, 253
' Adding area flow to channel
UNDEVBLOPPD (poor cover) subarea
Runoff Coefficient = 0.762
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Deciroal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.073(In/Hr) for a 100.0 year storni
' Subarea runoff = 30.012(CFS) for 19.000(Ac.)
Total runoff = 78.324(CFS) Total area = 44.800(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 104.000
**** NATURAL CHANNBL TIMB + SUBARBA FLOW ADDITION ****
' Top of natural channel elevation = 1055.000(Ft.)
End of natural channel elevation = 1051.600(Ft.)
, Length of natural channel = 720.000(Ft.)
Bstimated mean flow rate at snidpoint of channel = 94.059{CFS)
Natural valley channel type uaed
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.20(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel elope = 0.0047
~ Corrected/adjusted channel slope = 0.0047
Travel time = 3.75 min. TC = 29.42 min.
' Adding area flow to channel
UNDBVELOPSD (poor cover) subarea
' Runoff Coefficient = 0.753
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 1.924(In/Hr) for a 100.0 year storm
Subarea runoff = 26.069(CFS) for 18.000(Ac.)
Total runoff = 104.393(CFS) Total area = 62.800(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 104.000 to Point/Station 105.000
' **** NATORAL CHANNSL TIMS + SUBARBP, FLOW ADDITION ****
Top of natural channel elevation = 1051.600{Ft.)
' Snd of natural channel elevation = 1050.600(Ft.)
Length of natural channel 400.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 121.348(CFS)
' Natural valley channel type used ~~
, L.A. County flood control district foxmula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.52(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drope and waterfalla (Plate D-6.2)
Normal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
~ Travel time = 2.65 min. TC = 32.07 min.
' Adding area flow to channel
UNDBVSLOPED (poor cover) subarea
Runoff Coefficient = 0.747
~
'
,
'
~
'
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.835(In/Hr) for a 100.0 year storm
Subarea runoff = 27.954(CFS) for 20.400(Ac.)
Total runoff = 132.347(CFS) Total area = 83.200(Ac.)
Zy~
+++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
**** NATURAL CHANNSL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1050.600(Ft.)
Snd of natural channel elevation = 1048.000(Ft.)
Length of natural channel = 650.000(Ft.)
8stimated mean flow rate at midpoint of channel = 149.367(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.39(Ft/s)
, Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0040
, Corrected/adjusted channel slope = 0.0040
Travel time = 3.20 min. TC = 35.27 min.
' Adding area flom to channel
UNDBVELOPSD (poor cover) subarea
Runoff Coefficient = 0.758
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.700
Decimal fraction soil group C= 0.300
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 80.40
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Rainfall intensity = 1.741(in/Hr) for a 100.0 year storm
Subarea runoff = 28.261(CFS) for 21.400(Ac.)
Total runoff = 160.608(CFS) Total area = 104.600(Ac.)
c~o
'
, Z55
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Procesa from Point/Station 106.000 to Point/Station 106.000
*+** CONFLUST7CB OF MINOR STREAMS **+*
Along Main Stream number: 1 in nozmal stream number 1
~ Stream flow area = 104.600(AC.)
Runoff from this etream = 160.608(CFS)
Time of concentration = 35.27 min.
' Rainfall intensity = 1.741(In/Hr)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** USBR DBFINED FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 1.724(In/Hr) for a 100.0 year stoxm
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.768
, Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 0.530
Decimal fraction soil group C= 0.470
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 81.76
Pervious area fraction = 1.000; Impervious fraction = 0.000
User apecified values are as follows:
~ TC = 35.91 min. Rain intensity = 1.72(in/Hr)
Total area = 1054.90(Ac.) Total runoff = 1627.56(CFS)
'
LJ
'
,
,
,
'
'
,
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 107.000 to Point/Station 108.000
**** IMPROVED CHANNBL TRAVSL TIMF3 ****
Upstream point elevation = 1060.000(Ft.)
Downstream point elevation = 1041.500(Ft.)
Channel length thru subarea = 1650.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or ~Z~ of leFt channel bank = 2.000
Slope or ~Z~ of right channel bank = 2.000
Batimated mean flow rate at midpoint of channel = 1636.817(CFS)
Manning's ~N~ = 0.030
Maximum depth of channel = 7.200(Ft.)
Flow(q) thru subarea = 1636.817(CFS)
Depth of flow = 6.962(Ft.), Average velocity = 12.425(Ft/s)
Channel flow top width = 32.847(Ft.)
Flow Velocity = 12.42(Ft/s)
Travel time = 2.21 min.
Time of concentration = 38.13 min.
Sub-Channel No. 1 Critical depth = 7.250(Ft.)
' ' ' Critical flow top width = 33.800(Ft.)
' ' ' Critical flow velocity= 11.578(Ft/s)
' ' ~ Critical flow area = 141.370(Sq.Ft?
Adding area flow to channel
UNDEVSLOPBD (poor cover) aubarea
Runoff Coefficient = 0.766
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~~
, 25G
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.668(In/Hr) for a 100.0 year storm
Subarea runoff = 15.328(CFS) for 12.000(AC.)
, Total xvnoff = 1642.888(CFS) Total area = 1066.900(Ac.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 108.000 to Point/Station 108.000
**** CONFLUBNCB OF MINOR STREAMS ****
'
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1066.900(Ac.)
Runoff from this stream = 1642.888(CFS)
, Time of concentration = 38.13 min.
Rainfall intensity = 1.668(In/Hr)
Summary of stream data:
1 Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
,
,
,
,
'
~
~I
~'
,
'
'
'
~
1 160.608 35.27
2 1642.888 38.13
Large at stream flow has longer
Qp = 1642.888 + sum of
Qb Ia/Ib
160.608 * 0.958 =
Qp = 1796.760
1.741
1.668
time of concentration
153.873
Total of 2 streams to confluence:
Flow rates before confluence point:
160.608 1642.888
Area of atreams before confluence:
104.600 1066.900
Results of confluence:
Total flow rate = 1796.760(CFS)
Time of concentration = 38.125 min.
Bffective stream area after confluence = 1171.500(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** IMPROVED CHANNBL TRAVBL TIMS ****
Upstream point elevation = 1041.500(Ft.)
Downstream point elevation = 1025.000(Ft.)
Channel length thru subarea = 2350.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or 'Z~ of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
8stimated mean flow rate at midpoint of channel
Manning's 'N~ = 0.015
Maximum depth of channel = 8.000(Ft.)
Flow(q) thru subarea = 1810.564(CFS)
Depth of flow = 5.957(Ft.), Average velocity
Channel flow top width = 28.829(Ft.)
Flow Velocity = 17.97(Ft/s)
Travel time = 2.18 min.
1810.564(CFS)
17.968(Ft/s)
~2
, Time of concentration = 40.31 min. 25~
' Sub-Channel No. 1 Critical depth = 7.625(Ft.)
' ' ' Critical flow top width = 35.500(Ft.)
~ ~ ' Critical flow velocity= 11.726(Ft/s)
' ~ ~ ' Critical flow area = 154.406(Sq.Ft)
Adding area flow to channel
' UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.762
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.618(in/Ar) for a 100.0 year stozm
Subarea runoff = 22.196(CFS) for 18.000(Ac.)
' Total runoff = 1818.957(CFS) Total area = 1189.500(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Proceas from Point/Station 109.000 to Point/Station 109.000
**** CONFLUSNC$ OF MAIN STRBAMS ****
' The following data inside Main Stream is listed:
in Main Stream number: 1
Stream flow area = 1189.500(Ac.)
, Runoff from this stream = 1818.957(CFS)
Time of concentration = 40.31 min.
Rainfall intenaity = 1.618(In/Hr)
Program ie now atarting with Main Stream No. 2
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Procesa from Point/Station 110.000 to Point/Station 111.000
**** INZTIAL ARRA SVALUATION ****
' Initial area flow diatance = 1000.000(Ft.)
Top (of initial area) elevation = 1058.000(Ft.)
Eottom (of initiai area) elevation = loa5.ooo(Ft.)
Difference in elevation = 13.000(Ft.)
, Slope = 0.01300 s(percent)= 1.30
TC = k(0.530)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.021 min.
, Rainfall intensity = 2.377(In/Hr) for a 100.0 year storm
UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.801
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Snitial subarea runoff = 12.765(CFS)
' Total initial stream area = 6.700(Ac.)
Pervious area fraction = 1.000
~~
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' 25$
Proceas from Point/Station 111.000 to Point/Station 112.000
' ***+ NATURAL CHANNSL TIME + SUBAREA FIAW ADDITION ****
Top of natural channel elevation = 1045.000(Ft.)
Snd of natural channel elevation = 1037.000(Ft.)
~ Length of natural channel = 960.000(Ft.)
Sstimated mean flom rate at midpoint of channel = 19.909(CFS)
' Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(&nglish Units)".352)(slope"0.5)
' Velocity using mean channel flow = 2.73(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalis (Plate D-6.2)
, Normal channel slope = 0.0083
Corrected/adjusted channel slope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
~ Adding area flow to channel
' UND&VBLOPSD (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
' Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
, Pexvious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year atona
Subarea runoff = 12.205(CFS? for 7.500(AC.)
Total runoff = 24.970(CFS) Total area = 14.200(Ac.)
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Procesa from Point/Station 112.000 to Point/Station 115.000
**** NATQRAL CHANNBL TIMS + SUBARBA FLOW ADDITION +'***
' Top of natural channel elevation = 1037.000(Ft.)
Snd of natural channel elevation = 1033.400(Ft.)
Length of natural channel 560.000(Ft.)
Batimated mean flow rate at midpoint of channel = 27.783(CFS)
' Natural valley channel type used
L.A. County flood control dietrict forniula for channel velocity:
, Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.63(Ft/s)
Correction to map slope used on extremely rugged channels with
, drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0064
Corrected/adjusted channel slope = 0.0064
' Travel time = 3.55 min. TC = 29.43 min.
~ Adding area flow to channel
UNDEVELOPSD (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 0.500
g~
, ~59
Decimal fraction soil group C= 0.500
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.924(In/Hr) for a 100.0 year stozm
' Subarea runoff = 4.808tCFS) for 3.200(AC.)
Total runoff = 29.778(CFS) Total area = 17.400(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
' **~* CONFLUENCF3 OF MINOR STRSAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 17.400(AC.)
' Runoff from this stream = 29.778(CFS)
Time of concentration = 29.43 min.
Rainfall intensity = 1.924(In/Hr)
'
+++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 113.000 to Point/Station 114.000
**** INITIAL ARfiA SVALUATION ****
Initial area flow distance = 670.000(Ft.)
, Top (of initial area) elevation = 1055.200(Ft.)
Bottom !of initial area) elevation = 1047.000{Ft.)
Difference in elevation = 8.200(Ft.)
, Slope = 0.01224 s(percent)= 1.22
TC = k(0.530)*((length"3)/(elevation change)I"0.2
Initial area time of concentration = 17.265 min.
Rainfall inteneity = 2.579(In/Eir) for a 100.0 year storm
' UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.808
Decisnal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.847(CFS)
Total initial stream area = 10.000(AC.)
' Pervious area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 114.000 to Point/Station 115.000
**** NATURAL CHANN$L TIMB + SUBARBP, FLOW ADDITZON **t•
, Top of natural channel elevation = 1047.000(Ft.)
Snd of natural channel elevation = 1033.400lFt.)
Length of natural channel = 1300.000(Ft.?
~ Batimated mean flow rate at midpoint of channel = 35.962(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.60(Ft/s)
, Correction to map slope used on extremely rugged channels with ~
, 2~0
drops and waterfalls (Plate D-6.2)
' Noxmal channel elope = 0.0105
Corrected/adjueted channel slope = 0.0105
Travel time = 6.01 min. TC = 23.28 min.
, Adding area flow to channel
UNDSVELOPBD (poor cover) subarea
, Runoff Coefficient = 0.794
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
' Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 2.188(In/Hr) for a 100.0 year storm
Subarea runoff = 25.189(CFS) for 14.500(Ac.)
Total runoff = 46.036(CFS) Total area = 24.500(AC.)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLtJ$NCB OF MINOR STRRAMS ****
Along Main Stream number: 2 in normal stream number 2
, Stream flow area = 24.500(AC.)
Runoff from this stream = 46.036(CFS)
Time of concentration = 23.28 min.
' Rainfall intensity = 2.188(In/Hr)
Suimnary of stream data:
Stream Flow rate TC Rainfall Intensity
, No. (CFS) (min) (In/Hr)
' 1 29.778 29.43 1.924
2 46.036 23.28 2.188
Largeat stream flow has longer or shorter time of concentration
' Qp = 46.036 + sum of
Qa Tb/Ta
29.778 * 0.791 = 23.553
Qp = 69.590
, Total of 2 streams to confluence:
Flow rates before confluence point:
' 29.778 46.036
Area of streams before confluence:
17.400 24.500
Resulta of confluence:
' Total flow rate = 69.590(CFS)
Time of concentration = 23.277 min.
Effective stream area after confluence = 41.900(Ac.)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Proceas from Point/Station 115.000 to Point/Station 118.000
+*** NATURAL CHANNSL TIMS + SUBARfiA FLOW ADDITION ****
Top of natural channel elevation = 1033.400(Ft.)
' Bnd of natural channel elevation = 1030.500(Ft.) g(~
, 2~/
Length of natural channel = 730.000(Ft.)
' Bstimated mean flow rate at midpoint of channel = 71.251(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)islope"0.5)
Velocity ueing mean channel flow = 2.70(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0040
' Corrected/adjusted channel alope = 0.0040
Travel time = 4.50 min. TC = 27.78 min.
' Adding area flow to channel
UNDSVBLOPBD (poor cover) subarea
Runoff Coefficient = 0.784
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impenrious fraction ~ 0.000
Rainfall intenaity = 1.986(In/Hr) for a 100.0 year etorm
' Subarea runoff = 3.115(CFS) for 2.000(Ac.)
Total runoff = 72.705(CFS) Total area = 43.900(AC.)
' +++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++~+
Proceas from Point/Station 118.000 to Point/Station 118.000
**** CONFLUENCS OF MINOR STREAMS ****
' Along Main Stream number: 2 in nosmal stream number i
Stream flow area = 43.900(AC.)
' Runoff from this stream = 72.705(CFS1
Time of concentration = 27.78 min.
Rainfall intensity = 1.986(In/Hr)
, +++++++++++++++++++++++++++++++++++++++++++++++++++t++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 117.000
' **** INITIAL ARBA SVALUATION **~*
Initial area flow distance = 1000.000(Ft.)
' Top (of initial area) elevation = 1053.900(Ft.)
Bottom (of initial area) elevation = 1042.300(Ft.)
Difference in elevation = 11.600{Ft.)
Slope = 0.01160 s(percent)= 1.16
' TC = k(0.530)*[(length"3}/(elevation change)~"0.2
Initial area time of concentration = 20.483 min.
Rainfall intensity = 2.348(In/Hr) for a 100.0 year storm
' UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pexvious area fraction = 1.000; Impervious fraction = 0.000 ~~
,
'
'
1
'
Initial subarea runoff = 17.473(CFS)
Total initial stream area = 9.300(Ac.)
Pervious area fraction = 1.000
26 Z
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION ***`'
Top of natural channel elevation = 1042.300(Ft.)
Bnd of natural channel elevation = 1030.500(Ft.)
Length of natural channel = 1430.000(Ft.)
8stimated mean flow rate at midpoint of channel = 30.625(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngliah Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.06(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0083
Corrected/adjusted chanael slope = 0.0083
Travel time = 7.79 min. TC = 28.27 min.
~I
'
'
'
'
,
,
'
'
'
1
Adding area flow to channel
UNDEVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.783
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.966(In/Hr) for a 100.0 year stozm
Subarea runoff = 21.567lCFS) for 14.000(AC.)
Total runoff = 39.040(CFS) Total area = 23.300(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 118.000 to Point/Station 118.000
**** CONFLUENCS OF MINOR STRBAMS ****
Along Main Stream number: 2 in normal stream number 2
Stream flow area = 23.300(AC.)
Runoff from this stream = 39.040(CFS)
Time of concentration = 28.27 min.
Rainfall intensity = 1.966(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 72.705 27.'78
2 39.040 28.27
Largest stream flow has longer
Qp = 72.705 + sum of
Qa Tb/Ta
Rainfall Intensity
(In/Ar)
1.986
1.966
or ahorter time of concentration
~~
~ 2~3
39.040 * 0.982 = 38.353
' Qp = 111.058
Total of 2 streams to confluence:
~ Flow rates before confluence point:
72.705 39.040
Area of streama before confluence:
43.900 23.300
~ Results of confluence:
Total flow rate = 111.058(CFS)
Time of concentration = 27.775 min.
' Effective atream area after confluence = 67.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 118.000 to Point/Station 122.000
***~ NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION *+**
, Top of natural channel elevation = 1030.500(Ft.)
Snd of natural channel elevation = 1028.000(Ft.)
Length of natural channel = 990.000(Ft.)
~ Setimated mean flow rate at midpoint of channel = 116.016(CFS)
Natural valley channel type uaed
L.A. County flood control district formula for channel velocity:
t Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity uaing mean channel flow = 2.49(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
I Travel time = 6.61 min. TC ~ 34.39 min.
' Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.772
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.766(In/Hr) for a 100.0 year storm
~ Subarea runoff = 8.178lCFS) for 6.000(AC.)
Total runoff = 119.236(CFS) Total area = ~3.200(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
*+** CONFLUSNCB OF MINOR STRfiAMS ****
' Along Main Stream number: 2 in normal stream number 1
Stream flow area = 73.200(AC.)
, Runoff from this atream = 119.236(CFS)
Time of concentration = 34.39 min.
Rainfall intensity = 1.766(In/Hr)
' ~
_ _ ~
;~ '6~'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Procesa from Point/Station 119.000 to Point/Station 120.000
**** INITIAL ARBA SVALUATION ****
1~ Initial area flow distance = 540.000(Ft.)
Top (of initial area) elevation = 1051.200(Ft.)
Bottom (of initial area) elevation = 1045.500(Ft.)
Difference in elevation = 5.700(Ft.)
~ Slope = 0.01056 s(percent)= 1.06
~ TC = k(0.530)*[tlength"3)/(elevation change)]"0.2
Initial area time of concentration = 16.313 min.
~ Rainfall intensity = 2.661(In/Hr} for a 100.0 year stozm
UNDPsVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.811
Decimal fraction soil group A= 0.000
I Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 21.575(CFS)
Total initial stream area = 10.000(AC.)
~' Pervious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNEL TIMfi + SUBAREA FLOW ADDITION **"'*
~ Top of natural channel elevation = 1045.500(Pt.)
8nd of natural channel elevation = 1038.000(Ft.)
Length of natural channel = 870.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 38.188(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Sngliah Units)".352)(elope"0.5)
Velocity using mean channel flow = 3.33(Ft/s)
,~ Correction to map slope used on extremely nigged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0086
~ Corrected/adjusted channel slope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
Adding area flow to channel
~
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.800
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~` Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Rainfall intenaity = 2.336(Zn/Hr) for a 100.0 year storm
Subarea runoff = 28.772(CFS) for 15.400(Ac25.400(AC.)
Total runoff = 50.347(CFS) Total area =
~ ~O
,' z~ s
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 121.000 to Point/Station 122.000
~ **** NATURAL CHANNSL TIME + SUBAREA FLOW ADDITION **~*
~ Top of natural channel elevation = 1038.000(Ft.)
Snd of natural channel elevation = 1028.000(Ft.)
Length of natural channel 1140.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 66.998(CFS)
~r, Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
i~ Velocity(ft/s> _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flom = 3.95(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0088
Corrected/adjuated channel slope = 0.0088
~ Travel time = 4.81 min. TC = 25.48 min.
~ Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 2.082(In/Hr) for a 100.0 year stoxm
Subarea runoff = 27.599(CFS) for 16.800(Ac.)
Total runoff = 77.947(CFS) Total area = 42.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~. Process from Point/Station 122.000 to Point/Station 122.000
**** CONFLUBNCB OF MINOR STRIiAMS **~*
,~ Along Main Stream number: 2 in normal stream number 2 ~
Stream flow area = 42.200(Ac.)
Runoff from this stream = 77.947(CFS)
,~ Time of concentration = 25.48 min.
Rainfall intensity = 2.082(In/Hr)
' Suimnary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~ 1 119.236 34.39 1.766
2 77.947 25.48 2.062
~' L~argest stream flow has longer time of concentration
119.236 + sum of
Qb Ia/ib
~ 77.947 * 0.848 = 66.102
Qp = 185.338
Total of 2 streama to confluence:
~ Flow rates before confluence point: ~,~
,'
2~G
119.236 77.947
,~ Area of streame before confluence:
73.200 42.200
Results of confluence:
~ Total flow rate = 185.338(CFS)
Time of concentration = 34.390 min.
Sffective atream area after confluence = 115.400(Ac.)
~~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
**** CONFLUENCB OF MAIN STREAMS ****
The following data inside Main Stream is listed:
~ In Main Stream number: 2
Stream flow area = 115.400(Ac.)
Runoff from this atream = 185.338(CFS)
'~ Time of concentration = 34.39 min.
Rainfall intenaity = 1.766(in/Hr)
Sucmnary of atream data:
~ Stream Flow rate TC Rainfall Intenaity
No. (CFS) (min) (In/Hr)
~
~
~~
~
,~;
,~
~'
~
~
~
~
1 1818.957 40.31 1.618
2 185.338 34.39 1.766
Largest etream flow has longer time of concentration
Qp = 1818.957 + aum of
Qb ia/Ib
185.338 * 0.916 = 169.846
Qp = 1988.802
Total of 2 main streams to confluence:
Flow rates before confluence point:
1818.957 185.338
Area of atreams before confluence:
1189.500 115.400
Results of confluence:
Total flow rate = 1988.802(CFS)
Time of concentration = 40.305 min.
Sffective atream area after confluence = 1304.900(Ac.)
~v
3nl
~'
Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264BEX.out
~ ------------------------------------------------------------------------
TR 30264 EXISTING CONDITION WITH OFF-SITES DETAINED
~ 100 YEAR STORM
~ JN 32006
' ------------------------------------------------------------------------
********* Hydrology Study Control Information **********
.~ English (in-lb) Units used in input data file
~ ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
~ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,Tmc,Rnch CaNOrco ) area used.
10 year storm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
100 year storm 10 minute intensity = 3.480(In/Hr)
100 year stornt 60 minute intensity = 1.300(In/Hr)
Storm event year = 100.0
Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1148.000(Ft.)
Bottom (of initial area) elevation = 1130.300(Ft.)
Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1.77
TC = k(0.530)*[(length"3)/(elevation change)]"'0.2
Initial area time of concentration = 18.823 min.
Rainfall intensity = 2.460(In/Hr) for a 1b0.
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
0 year storm
~ Pervious area fraction = 1.000; Impervious fraction = 0.000 ~2~
~ Initial subarea runoff =
Total initial stream area
, ~ Pervious area fraction = 1
~'
~~
~~
19.200(CFS)
= 10.000(AC.)
.000
3az
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1130.300(Ft.)
End of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
Estimated mean flow rate at midpoint of channel = 37.440(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.45(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0156
~ Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 min. TC = 22.49 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
~ Runoff Coefficient = 0.770
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group,D = 0.000
, RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.230(In/Hr) for a 100.0 year storm
Subarea runoff = 32.632(CFS) for 19.000(AC.)
Total runoff = 51.832(CFS) Total area = 29.000(AC.)
:~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 103.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1115.000(Ft.)
End of natural channel elevation = 1100.500(Ft.)
~ Length of natural channel = 1020.000(Ft.)
Estimated mean flow rate at midpoint of channel = 67.203(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.03(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~~~ Nozmal channel slope = 0.0142
Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min.
~ ~dc
~I
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea.
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
,~, Decimal fraction soil group C= 0.000
- Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.065(In/Hr) for a 100.0
Subarea runoff = 27.039(CFS) for 17.200(Ac.)
~ Total runoff = 78.870(CFS) Total area = 46
= 0.000
year storm
200(AC.)
3~3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1100.500(Ft.)
End of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 420.000(Ft.)
'~ Estimated mean flow rate at midpoint of channel = 79.297(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s? _ (7 + 8(q(English Units)".352)(slope"0.5)
.. Velocity using mean channel flow = 4.69(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
~ Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.758
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.002(In/Hr) for a 100.0 year storm
Subarea runoff = 0.758(CFS) for 0.500(AC.)
Total runoff = 79.629(CFS) Total area = 46.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nonnal stream number 1
Stream flow area = 46.700(AC.)
Runoff from this stream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(Zn/Hr) ~~
3 0¢.
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 104.000 to Point/Station 105.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 785.000(Ft.)
~ Top (of initial area) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.0oo(Ft.)
Difference in elevation = 14.000(Ft.)
~ Slope = 0.01783 s(percent)= 1.78
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.060 min.
~ Rainfall intensity = 2.596(In/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.786
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~i RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.410(CFS)
Total initial stream area = 10.000(AC.)
,, Pervious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1133.000(Ft.)
End of natural channel elevation = 1116.000(Ft.)
~ Length of natural channel = 1175.000(Ft.)
Estimated mean flow rate at midpoint of channel = 32.655(CFS)
Natural valley channel type used
~ L.A. County flood control district fonnula for channel velocity:
_ Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.12(Ft/s)
,~~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
,~ Normal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81 min.
.~' Adding area flow to channel
UNDEVELOPED (poor cover) subarea
~ Runoff Coefficient = 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.268(In/Hr) for a 100.0 year stornt
~~ Subarea runoff = 21.013(CFS) for 12.000(AC.)
Total runoff = 41.423(CFS) Total area = 22.000(AC.)
~ ~~
~ jns
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++,.++++++++
~ Process from Point/Station 106.000 to Point/Station 107.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1116.000(Ft.)
~ End of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
Estimated mean flow rate at midpoint of channel = 50.366(CFS)
~~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(English Units)"'_352)(slope"0.5)
Velocity using mean channel flow = 4.91(Ft/s)
L Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0160
- Corrected/adjusted channel slope = 0.0160
Travel time = 4.28 min. TC = 26.08 min.
~I.
~ Adding a~ea flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.761
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.056(In/Hr) for a 100.0 year storm
~ Subarea runoff = 14.857(CFS) for 9.500(Ac.)
Total runoff = 56.279(CFS) Total area = 31.500(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 31.500(Ac.)
,~ Runoff from this stream = 56.279(CFS)
Time of concentration = 26.08 min.
.. Rainfall intensity = 2.056(In/Hr)
Summary of stream data:
,~' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~~ 1 79.629 27.36 2.002
~ 2 56.279 26.08 2.056
Largest stream flow has longer time of concentration
Qp = 79.629 + sum of
Qb Ia/Ib
56.279 * 0.974 = 54.815
~~ Qp = 134.443
~ Total of 2 streams to confluence: C`'~
~06
~ Flow rates before confluence point:
79.629 56.279
~~ Area of streams before confluence:
46.700 31.500
Results of confluence:
Total flow rate = 134.443(CFS)
I~I `~ Time of concentration = 27.365 min.
, Effective stream area after confluence = 78.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process~from Point/Station 107.000 to Point/Station 110.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
' Top of natural channel elevation = 1095.800(Ft.)
i End of natural channel elevation = 1087.500(Ft.)
Length of natural channel 910.000(Ft.)
Estimated mean flow rate at midpoint of channel = 143.899(CFS)
/ Natural valley channel type used
* L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ NoYmal channel slope = 0.0091
Corrected/adjusted channel slope = 0.0091
Travel time = 3.00 min. TC = 30.36 min.
'- Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
' Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~. Pervious
Rainfall area fraction = 1.000; Impervious fraction = 0.000
intensity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
Total ru noff = 150.057(CFS) Total area = 89.200(AC.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
~, Stream flow area = 89
Runoff from this stream =
Time of concentration =
Rainfall intensity =
~
1 in norntal stream number 1
.200(AC.)
150.057(CFS)
30.36 min.
1.891(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
,~- Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA EVALUATION ****
~
~i8
~ Initial area flow distance = 710.000(Ft.)
~ Top (of initial area) elevation = 1112.000(Ft.)
Bottom (of initial area) elevation = 1100.000(Ft.)
Difference in elevation = 12.000(Ft.)
Slope = 0.01690 s(percent)= 1.69
TC = k(0.530)*[(length"3)/(elevation change)]
Initial area time of concentration = 16.565
Rainfall intensity = 2.639(in/Hr) for a
UNDEVELOPED (poor cover) subarea
'~, Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
~ Decimal
Decimal fraction soil group B= 1.000
fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
1 Initial subarea runoff = 17.875(CFS)
Total in itial stream area = 8.600(Ac
~ Pervious area fraction = 1.000
"'0.2
min.
100.0 year storm
fraction = 0.000
30-(
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 109.000 to Point/Station 110.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1100.000(Ft.)
End of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 25.046(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.51(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~- Normal channel slope = 0.0121
Corrected/adjusted channel slope = 0.0121
. Travel time = 4.89 min. TC = 21.46 min.
Adding area flow to channel
' UNDEVELOPED (poor cover) subarea
~ Runoff Coefficient = 0.773
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.289(In/Hr) for a 100.0 year storm
~ Subarea runoff = 12.206(CFS) for 6.900(Ac.)
Total runoff = 30.081(CFS) Total area = 15.500(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCE OF MINOR STREAMS **** Q~
~ \
~
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 15.500(Ac.)
1 Runoff from this stream = 30.081(CFS)
• Time of concentration = 21.46 min.
Rainfall intensity = 2.289(In/Hr)
~ Summary of stream data:
Stream Flow rate TC Rainfall Intensity
,~ No. (CFS) (min) (In/Hr)
~, 1 150.057 30.36
2 30.081 21.46 1.891
2.289
Largest stream flow has longer time of concentration
Qp = 150.057 + sum of
~ Qb Ia/Ib
30.081 * 0.826 = 24.8 53
Qp = 174.910
~ Total of 2 streams to confluence:
' Flow rates before confluence point:
~ 150.057 30.081
Area of streams before confluence:
89.200 15.500
Results of confluence:
Total flow rate = 174.910(CFS)
~ Time of concentration = 30.362 min.
Effective stream area after confluence = 104.700(AC.)
3a8
''
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 110.000 to Point/Station 123.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1087.500(Ft.)
~ End of natural channel elevation = 1083.500(Ft.)
Length of natural channel 675.000(Ft.)
' Estimated mean flow rate at midpoint of channel = 189.778(CFS)
~
~
~
~
~
~
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.44(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0059
Corrected/adjusted channel slope = 0.0059
Travel time = 2.53 min. TC = 32.89
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78. 00
Pervious area fraction = 1.000; Impervious
min.
fraction = 0.000 \ob
~
Rainfall intensity = 1.809(In/Hr) for a 100.0 year storm
~ Subarea runoff = 23.997(CFS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(AC.)
3°~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
`j The following data inside Main Stream is listed:
~ In Main Stream number: 1
,~ Stream flow area = 122.500(Ac.)
Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intensity = 1.809(In/Hr)
, Program is now starting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 111.000 to Point/Station 112.000
**** INITIAL AREA EVALUATION ****
~ Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1143.000(Ft.)
Eottom (of initial area) elevation = 1135.300(Ft.)
Difference in elevation = 7.700(Ft.)
~ Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
~ Initial area time of concentration = 14.668 min.
Rainfall intensity = 2.821(In/Hr) for a 100.0 year storm
- UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.815
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
1 Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Initial subarea runoff = 23.004(CFS)
Total initial stream area = 10.000(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 112.000 to Point/Station 113.000
**** NATIJRAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1135.300(Ft.) ~
End of natural channel elevation = 1122.800(Ft.)
Length of natural channel = 510.000(Ft.)
Estimated mean flow rate at midpoint of channel = 44.858(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)~.352)(slope~0.5)
Velocity using mean channel flow = 4.66(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0154
~~V
310
Corrected/adjusted channel slope = 0.0154
Travel time = 2.90 min. TC = 17.56 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.555(In/Hr) for a 100.0
Subarea runoff = 39.199(CFS) for 19.000(AC.)
Total runoff = 62.203(CFS) Total area = 29
= 0.000
year storm
000(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1122.800(Ft.)
End of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
Estimated mean flow rate at midpoint of channel = 82.580(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.75(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
, Corrected/adjusted channel slope = 0.0112
Travel time = 3.68 min. TC = 21.25 min.
, Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.774
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B.= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.301(In/Hr) for a 100.0 year stornt
~ Subarea runoff = 33.820(CFS) for 19.000(AC.)
Total runoff = 96.023(CFS) Total area = 48.000(Ac.)
~i ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 114.000 to Point/Station 114.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 48.000(AC.)
1 Runoff from this stream = 96.023(CFS) `p2
~ 3 (j
Time of concentration = 21.25 min.
~ Rainfall intensity = 2.301(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~I ~ Process from Point/Station 115.000 to Point/Station 115.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
,~ Rainfall intensity = 2.029(In/Hr) for a 100.0 year storni
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.813
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.000
Decimal fraction soil group C= 1.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 86.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
~ TC = 26.70 min. Rain intensity = 2.03(In/Hr)
Total area = 217.00(AC.) Total runoff = 324.00(CFS)
~
,
~
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 116.000
**** IMPROVED CHANNEL TRAVfiL TIME ****
Upstream point elevation = 1133.000(Ft.)
Downstream point elevation = 1106.500(Ft.)
Channel length thru subarea = 1960.000(Ft.)
Channel base width = 10.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000
Slope or 'Z' of right channel bank = 3.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 7.000(Ft.)
Flow(q) thru subarea = 339.080(CFS)
Depth of flow = 2.366(Ft.), Average velocity =
Channel flow top width = 26.562(Ft.)
Flow Velocity = 7.84(Ft/s)
Travel time = 4.17 min.
Time of concentration = 30.87 min.
339.080(CFS)
7.840(Ft/S)
Sub-Channel No. 1 Critical depth = 2.469(Ft.)
'. ' ' Critical flow top width = 27.281(Ft
' ' ' Critical flow velocity= 7.368(Ft/s)
' ' ' Critical flow area = 46.019(Sq.Ft)
Adding area flow to channel •
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.450
Decimal fraction soil group C= 0.550
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.40
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.874(In/Hr) for a 100.0 year storm
Subarea runoff = 29.570(CFS) for 20.200(AC.)
Total runoff = 353.570(CFS) Total area = 237.200(Ac.)
~c~3
I ~ 312
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 116.000
' **** CONFLLTENCE OF MINOR STREAMS ****
~ Along Main Stream number: 2 in normal stream number 2
Stream flow area = 237.200(AC.)
Runoff from this stream = 353.570(CFS)
~ Time of conCentration = 30.87 min.
Rainfall intensity = 1.874(In/Hr)
Summary of stream data:
~ ~
~
~
~
'
~
~
,
Stream Flow rate TC
No. (CFS) (min)
1 96.023 21.25
2 353.570 30.87
Largest stream flow has longer
Qp = 353.570 + sum of
Qb Ia/Ib
96.023 * 0.814 =
Qp = 431.762
Rainfall Intensity
(In/Hr)
2.301
1.874
time of concentration
78.192
Total of 2 streams to confluence:
Flow rates before confluence point:
96.023 353.570
Area of streams before confluence:
48.000 237.200
Results of confluence:
Total flow rate = 431.762(CFS)
Time of concentration = 30.867 min.
Effective stream area after confluence = 285.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 123.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1106.500(Ft.)
Downstream point elevation = 1083.500(Ft.)
Channel length thru subarea = 1970.000(Ft.)
Channel base width = 25.000(Ft.)
Slope or 'Z' of left channel bank = 15.000
Slope or 'Z' of right channel bank = 2.000
Estimated mean.flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 2.500(Ft:)
Flow(q) thru subarea = 439.634(CFS)
Depth of flow = 1.756(Ft.), Average velocity =
Channel flow top width = 54.859(Ft.)
Flow Velocity = 6.27(Ft/s)
Travel time = 5.24 min. '
Time of concentration = 36.10 mi:n:
439.634(CFS)
6.268(Ft/s)
Sub-Channel No. 1 Critical depth ~_ - 1.734(Ft.)
' ' ' Critical £Lbw:.top width = 54.484(Ft.)
' ' ' Critical f~'t)W velocity= 6.378(Ft/s)
' ' ' Critical f1~5~+ area = 68.928(Sq.Ft)
~~
~ Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.738
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.719(In/Hr) for a 100.0
Subarea runoff = 13.201(CFS) for 10.400(AC.)
~ Total runoff = 444.963(CFS) Total area = 295
- 0.000
year storm
600(Ac.)
~ (3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 295.600(Ac.)
~ Runoff from this stream = 444.963(CFS)
Time of concentration = 36.10 min.
., Rainfall intensity = 1.719(In/Hr)
Program is now starting with Main Stream No. 3
~
- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 117.000
~ **** USER DEFINED FLOW INEORMATION.AT A POINT ****
Rainfall intensity = 2.617(In/Iir) for a 100.0 year storm
~ SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 16.82 min. Rain intensity = 2.62(In/Hr)
1 Total area = 62.70(AC.) Total runoff = 129.00(CFS)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 118.000
**** NAT[JRAL CHANNEL TIME + SU$AREA FLOW-ADDITION ****
~ Top of natural channel elevation = 1118.000(Ft.)
End of natural channel elevation = 1101.000(Ft.)
Length of natural channel = 790 .000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 138.258(CFS)
. Natural valley channel type used
~
' L.A. County flood control district
Velocity(ft/s) _ (7 + 8(q(English forniula for channel velocity:
Units)".352)(slope"0.5)
Velocity using mean channel flow = 7.68(Ft/s)
~ Correction to map slope used on extremely rugged channels with `~
~ 3l~
drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0215
Corrected/adjusted channel slope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
~ Runoff Coefficient = 0.782
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.480(In/Hr) for a 100.0 year stozm
Subarea runoff = 17.447(CFS) for 9.000(Ac.)
Total runoff = 146.447(CFS) Total area = '71.700(Ac.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 118.000 to Point/Station 121.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
~ End of natural channel elevation = 1090.500(Ft.)
Length of natural channel 980.000(Ft.)
' Estimated mean flow rate at midpoint of channel = 156.251(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.63(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0107
Corrected/adjusted channel slope = 0.0107
~ Travel time = 2.90 min. TC = 21.44 min.
Adding area flow to channel
' UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal frac•tion soil group D= 0.000 ~
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.290(In/Hr) for a 100.0 year stozm
Subarea runoff = 16.992(CFS) for 9.600(AC.)
, Total runoff = 163.439(CFS) Total area = 81.300(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUENCE OF MINOR STREAMS ****
, Along Main Stream number: 3 in normal stream number 1 ~6~
~ 315
Stream flow area = 81.300(Ac.)
, Runoff from this stream = 163.439(CFS)
Time of concentration = 21.44 min.
Rainfall intensity = 2.290(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
~ **** INITIAL AREA EVALUATION ****
Initial area flow distance = 920.000(Ft.)
~ Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1094.000(Ft.)
Difference in elevation = 66.000(Ft.)
Slope = 0.07174 s(percent)= 7.17
~ TC = k(0.480)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 12.462 min.
Rainfall intensity = 3.086(In/Hr) for a 100.0 year storm
~ SINGLE FAMILY (1 Acre Lot)
Runoff Coefficient = 0.718
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
^ Pervious area fraction = 0.800; Impervious fraction = 0.200
* Initial subarea runoff = 7.085(CFS)
' Total initial stream area = 3.200(AC.)
~ Pervious area fraction = 0.800
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION **+*
Top of natural channel elevation = 1094.000(Ft.)
, End of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 9.520(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 1.95(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0063
Corrected/adjusted channel slope = 0.0063
' Travel time = 4.78 min. TC = 17.25 min.
Adding area flow to channel
~ UNDSVELOPED (poor cover) subarea
Runoff Coefficient = 0.786
~ Decimal fraction soil
Decimal fraction soil group A= 0.000
group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00 ~61,
~
Pervious area fraction = 1.000; Impervious fraction
~ Rainfall intensity = 2.581(In/Hr) for a 100.0
Subarea runoff = 4.460(CFS) for 2.200(Ac.)
Total runoff = 11.545(CFS) Total area = 5
'
= 0.000
year stoxzn
400(Ac.)
3f~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 3 in normal stream number 2
Stream flow area = 5.400(AC.)
Runoff from this stream = 11.545(CFS)
Time of concentration = 17.25 min.
Rainfall intensity = 2.581(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 163.439 21.44
2 11.545 17.25 2.290
2.581
Largest stream flow has longer time of concentration
Qp = 163.439 + sum of
~ Qb Ia/Ib
11.545 * 0.887 = 10.243
Qp = 173.682
~ Total of 2 streams to confluence:
Flow rates before confluence point:
163.439 11.545
~ Area of streams before confluence:
81.300 5.400
Results of confluence:
Total flow rate = 173.682(CFS)
' Time of concentration = 21.438 min.
Effective stream area after confluence = 86.700(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
' **** NAT[JRAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1090.500(Ft.)
~ End of natural channel elevation = 1087.100(Ft.)
Length of natural channel 740.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 192.512(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 3.93(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0046
Corrected/adjusted channel slope = 0.0046
Travel time = 3.14 min. TC = 24.58 min. ~b$
~
~
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
' Runoff Coefficient = 0.765
~ Decimal
Decimal fraction soil group A= 0.000
fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.124(In/Hr) for a 100.0
Subarea runoff = 30.531(CFS) for 18.800(Ac.)
~ Total runoff = 204.212(CFS) Total area = 105
= 0.000
year storm
500 (Ac . )
3 ~l
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
,
Top of natural channel elevation = 1087.100(Ft.)
End of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
Estimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.08(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfa3ls (Plate D=6.2)
, Normal channel slope = 0.0026
Corrected/adjusted channel slope = 0.0026
Travel time = 7.36 min. TC = 31.94 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.747
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.839(In/Hr) for a 100.0 year stornt
Subarea runoff = 12.915(CFS) for 9.400(AC.)
Total runoff = 217.127(CFS) Total area = 114.900{AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 3
Stream flow area = 114.900(AC.)
Runoff from this stream = 217.127(CFS) ~~
Time of concentration = 31.94 min.
Rainfall intensity = 1.839(In/Hr)
~
Summary of stream data:
~ Stream Flow rate
No. (CFS)
~
~
~
~
~
~
TC
(min)
1 198.907 32.89
2 444.963 36.10
3 217.127 31.94
Largest stream flow has longer
Qp = 444.963 + sum of
Qb Ia/Ib
198.907 * 0.950 =
Qb Ia/Ib
217.127 * 0.935 =
Qp = 836.913
Rainfall Intensity
(In/Hr)
1.809
1.719
1.839
time of concentration
188.975
202.974
Total of 3 main streams to confluence:
Flow rates before confluence point:
198.907 444.963 217.127
Area of streams before confluence:
122.500 295.600 114.900
31~
Results of confluence:
~ Total flow rate = 836.913(CFS)
Time of concentration = 36.105 min.
Effective stream area after confluence = 533.000(Ac.)
~ ++++++++++4+++++f+++++++++++++t+++++++++++++++++++++++++i
~ Process from Point/Station 123.000 tb Point/Station
**** IMPROVED CHANNFsL TRAVEL TIME ****
129.000
+
Upstream point elevation = 1083.500(Ft.)
' Downstream point elevation = 1061.500(Ft.)
Channel length thru subarea = 910.000(Ft.)
Channel base width = 4.000(Ft.)
' Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel = 839.661(CFS)
Manning's 'N' = 0.030
~ Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 839.661(CFS)
Depth of flow = 4.564(Ft.), Average velocity = 14.014(Ft/s)
~ Channel flow top width = 22.256(Ft.)
Flow Velocity = 14.01(Ft/s)
Travel time = 1.08 min.
, Time of concentration = 37.19 min.
~ Sub-Channel No. 1 Critical depth = 5.500(Ft.)
' ' ' Critical flow top width = 26.000(Ft.)
, ' ' ' Critical flow velocity= 10.178(Ft/s)
' ' ' Critical flow area = 82.500(Sq.Ft)
~ Adding area flow to channel
UNDEVBLOPED (poor cover) subarea
Runoff Coefficient = 0.736 ,
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~~,0
~ 319
Decimal fraction soil group C= 0.000
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.691(In/Hr) for a 100.0 year storm
Subarea runoff = 4.358(CFS) for 3.500(AC.)
Total runoff = 841.271(CFS) Total area = 536.500(Ac.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
~ **** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
' In Main Stream number: 1
Stream flow area = 536.500(AC.)
Runoff from this stream = 841.271(CFS)
Time of concentration = 37.19 min.
' Rainfall intensity = 1.691(In/Hr)
Program is now starting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 124.000
**** INITIAL AREA EVALUATION ****
' Initial area flow distance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
~ Bottom (of initial area) elevation = 1088.000(Ft.)
Difference in elevation = 72.000(Ft.)
Slope = 0.08372 s(percent)= 8.37
' TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 12.987 min.
Rainfall intensity = 3.016(In/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
' Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Initial subarea runoff = 7.724(CFS)
Total initial stream area = 3.200(Ac.)
Pervious area fraction = 1.000
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 124.000 to Point/Station 125.000
**** ZMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1088.000(Ft.)
' Downstream point elevation = 1079.000(Ft.)
Channel length thru subarea = 390.000(Ft.)
Channel base width = 17.000(Ft.)
~ Slope or 'Z' of left channel bank = 2.000
Slope or ~Z~ of right channel bank.= 5.000
Estimated mean flow rate at midpoint of channel = 8.690(CFS)
' Manning~s 'N' = 0.030 _ ~~
Maximum depth of channel 1.000(Ft.)
320
Flow(q) thru subarea = 8.690(CFS)
Depth of flow = 0.198(Ft.), Average velocity = 2.484(Ft/s)
Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
Time of concentration = 15.60 min.
Sub-Channel No. 1 Critical depth = 0.199(Ft.)
' ' ' Critical flow top width = 18.395(Ft.)
' ' ' Critical flow velocity= 2.465(Ft/s)
' ' ' Critical flow area = 3.526(Sq.Ft)
Adding area flow to channel
UNDEVELOPfiD (poor cover) subarea
Runoff Coefficient = 0.791
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1:000; Impervious fraction = 0.000
Rainfall intensity = 2.727(In/Hr) for a 100.0 year storm
Subarea runoff = 1.725(CFS) for 0.800(Ac.)
Total runoff = 9.450(CFS) Total area = 4.000(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 4.000(AC.)
Runoff from this stream = 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall intensity = 2.727(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** USER DEFINED FLOW INFORMATION AT A POINT **~*
Rainfall intensity = 2.104(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.400
Decimal fraction soil group C= 0.600
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 63.80
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 25.00 min. Rain intensity = 2.10(In/Hr)
Total area = 118.00(Ac.) Total runoff = 293.20(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUENCE OF MINOR STREAMS **** ~\,y
Along Main Stream number: 2 in normal stream number 2
~
r
~
,
,
L.J
~
~
~
Flow(q) thru subarea = 8.690(CFS)
Depth of flow = 0.198(Ft.), Average velocity = 2.484(Ft/s)
Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
Time of concentration = 15.60 min.
Sub-Channel No. 1 Critical depth = 0.199(Ft.)
' ' ' Critical flow top width = 18.395(Ft
' ' ' Critical flow velocity= 2.465(Ft/s)
' ' ' Critical flow area = 3.526(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.791
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1:000; Impervious fraction ='0.000
Rainfall intensity = 2.727(In/Ar) for a 100.0 year storm
Subarea runoff = 1.725(CFS) for 0.800(AC.)
Total runoff = 9.450(CFS) Total area = 4.000(Ac.)
3Zo
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUENCE OF MZNOR STREAMS ****
Along Main Stream number: 2 in nos~nal stream number 1
Stream flow area = 4.000(AC.)
~ Runoff from this stream = 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall intensity = 2.727(In/Hr)
LJ
i
'
,
,
,
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Hr) for a 100.0 year stozm
SINGLS FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.400
Decimal fraction soil group C= 0.600
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 63.80
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 25.00 min. Rain intensity = 2.10(In/Hr)
Total area = 118.00(Ac.) Total runoff = 293.20(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 2 in normal stream number 2
~
,
~
'
~
lJ
J
'
,
Stream flow area = 118.000(Ac.)
Runoff from this stream = 293.200(CFS)
Time of concentration = 25.00 min.
Rainfall intensity = 2.104(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall intensity
No. (CFS) (min) (In/Hr)
1 9.450 15.60
2 293.200 25.00
Largest stream flow has longer
Qp = 293.200 + sum of
Qb Ia/Ib
9.450 * 0.772 =
Qp = 300.492
2.727
2.104
time of concentration
7.292
Total of 2 streams to confluence:
Flow rates before confluence point:
9.450 293.200
Area of streams before confluence:
4.000 118.000
Results of confluence:
Total flow rate = 300.492(CFS)
Time of concentration = 25.000 min.
Effective stream area after confluence =
122.000(AC.)
5~~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 126.000
**** IMPROVED CHANNEL TRAVEL TIME ****
lJ
'
~
,
,
L
'
~
,
Upstream point elevation = 1079.000(Ft.)
Downstream point elevation = 1073.700(Ft.)
Channel length thru subarea = 870.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or ~Z' of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 319.211(CFS)
Depth of flow = 3.059(Ft.), Average velocity =
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Ft/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
319.211(CFS)
5.561(Ft/s)
Sub-Channel No. 1 Critical depth = 2.656(Ft.)
' ' ' Critical flow top width = 28.906(Ft
' ' ' Critical flow velocity= 7.089(Ft/s)
' ' ' Critical flow area = 45.032(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.757
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~`~
5 "L "G
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.0OO;.Impervious fraction = 0.000
Rainfall intensity = 1.992(In/Hr) for a 100.0 year storm
Subarea runoff = 22.927(CFS) for 15.200(AC.)
~ Total runoff = 323.419(CFS) Total area = 137.200(AC.)
' +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 126.000 to Point/Station 127.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1073.700(Ft.)
~ Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
, Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
Estimated mean flow rate at midpoint of channel = 341.099(CFS)
, Manning's 'N' = 0.030
_
Maximum depth of channel 6.000(Ft.)
Flow(g) thru subarea = 341.099(CFS)
Depth of flow = 3.846(Ft.), Average velocity = 3.976(Ft/s)
' Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
' Travel time = 2.47 min.
Time of concentration = 30.08 min.
Sub-Channel No. 1 Critical depth = 2.750(F t.)
, ' ' ' Critical flow top width = 29.750(Ft.)
~ ' ' Critical flow velocity= 7.139(Ft/s)
~ ' ' Critical flow area = 47.781(Sq.Ft)
LJ
,
'
'
'
,
,
~
,
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.900(In/Hr) for a 100.0
Subarea runoff = 21.418(CFS) for 15.000(Ac.)
Total runoff = 344.837(CFS) Total area = 152
= 0.000
year storm
200(Ac.)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1072.300(Ft.)
Downstream point elevation = 1068.900(Ft.)
Channel length thru subarea = 620.000(Ft.)
Channel base width = 20.000(Ft.)
Slope or 'Z' of left channel bank = 4.000
Slope or 'Z' of right channel bank = 40.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
359.564(CFS)
~`~
~
Flow(q) thru subarea = 359.564(CFS)
, Depth of flow = 1.690(Ft.), Average velocity =
Channel flow top width = 94.361(Ft.)
Flow Velocity = 3.72(Ft/s)
' Travel time = 2.78 min.
Time of concentration = 32.86 min.
Sub-Channel No. 1 Critical depth = 1.367(Ft.)
' ' ' ' Critical flow top width =
' ' ' Critical flow velocity= 5
' ' ' Critical flow area = 68.
3.721(Ft/s)
80.156(Ft.)
.252(Ft/s)
466(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.810(In/Hr) for a 100.0
Subarea runoff = 17.538(CFS) for 13.000(AC.)
Total runoff = 362.376(CFS) Total area = 165
= 0.000
year storm
200(AC.)
3 23
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1068.900(Ft.)
Downstream point elevation = 1061.500(Ft.)
Channel length thru subarea = 750.000(Ft.)
Channel base width = 10.000(Ft.)
Slope or ~Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel =
Manning~s 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 377.731(CFS)
Depth of flow = 2.986(Ft.), Average velocity =
Channel flow top width = 21.944(Ft.)
Flow Velocity = 7.92(Ft/s)
Travel time = 1.58 min.
Time of concentration = 34.44 min.
377.731(CFS)
7.920(Ft/s)
Sub-Channel No. 1 Critical depth = 2.906(Ft.)
' ' ' Critical flow top width = 21.625(Ft.)
' ' ' Critical flow velocity= 8.220(Ft/s)
' ' ' Critical flow area = 45.955(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.742
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~~
,
,
~
1
~
'
~z~
Rainfall intensity = 1.764(In/Hr) for a 100.0 year stonn
Subarea runoff = 18.324(CFS) for 14.000(Ac.)
Total runoff = 380.700(CFS) Total area = 179.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 179.200(Ac.)
Runoff from this stream = 380.700(CFS)
Time of concentration = 34.44 min.
Rainfall intensity = 1.764(In/Hr)
Program is now starting with Main Stream No. 3
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** USfiR DEFINED FLOW INFORMATION AT A POINT ****
, Rainfall intensity = 2.787(In/Hr) for a 100.0 year stoxm
COhIl~7ERCIAL subarea type
' Runoff Coefficient = 0.875
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
' User specified values are as follows:
TC = 15.00 min. Rain intensity = 2.79(In/Hr)
Total area = 87.00(AC.) Total runoff = 108.00(CFS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
, **** CONFLUfiNCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
' In Main Stream number: 3
Stream flow area = 87.000(AC.)
Runoff from this stream = 108.000(CFS)
Time of concentration = 15.00 min.
, Rainfall intensity = 2.787(In/Hr)
Sutmnary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
, 1 841.271 37.19 1.691
2 380.700 34.44 1.764
3 108.000 15.00 2.787
' Largest stream flow has longer time of concentration
Qp = 841.271 + sum of
Qb Ia/Ib ~~~
, 380.700 * 0.959 = 364.944
Qb Ia/Ib
, 325
108.000 * 0.607 = 65.548
' Qp = 1271.763
Total of 3 main streams to confluence:
' Flow rates before confluence point:
841.271 380.700 108.000
Area of streams before confluence:
536.500 179.200 87.000
,
Results of confluence:
, Total flow rate = 1271.763(CFS)
Time of concentration = 37.187 min.
Effective stream area after confluence = 802.700(AC.)
' End of computations, total study area = 802.70 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
, Area averaged pervious area fraction(Ap) = 0.789
Area averaged RI index number = 74.1
'
'
~
'
,
,
'
,
'
'
~~~
,
,
,
'
,
'
'
,
Riverside County Rational Aydrology Program
3 51
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:798BEX.out
- -----------
TR 29798 EXISTING CONDITION INCLUDING OFF-SITES DETAINED
100 YEAR STORM
JN 32006
------------------------------------------------------------------------
********* HydTOlogy Study Control Inforntdtion **********
. '`
English (in-lb) Units used in input data file
------ -----------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
----~~ -----------------------------------------------------------
Rat~,..al pthod Hydrology Program based on
Ri:aersid~unty Flood Control & Water Conservation District
15 3 hydrol gy manual
~
' Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,Ttnc,Rnch CaNOrco ] area used.
, 10 year sto~m 10 minute intensity = 2.360(In/Hr)
10 year stozm 60 minute intensity = 0.880(In/Hr)
, 100 year
100 year storm 10 minute
storm 60 minute intensity =
intensity = 3.480(In/Hr)
1.300(In/Hr)
Stozm event year = 100.0
' Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
'
'
u
'
'
~
'
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
*~** INITIAL AREA EVALUATION ****
Initial area flow distance = 765.000(Ft.)
Top (of initial area) elevation = 1084.000(Ft.)
Bottom (of initial area) elevation = 1067.500(Ft.
Difference in elevation = 16.500(Ft.)
Slope = 0.02157 s(percent)= 2.16
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of Concentration = 16.255 min.
Rainfall intensity = 2.666(In/Hr) for a 100
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
0 year storm
\~~
, 352
Initial subarea runoff = 21.029(CFS)
, Total initial stream area = 10.000(Ac.)
Pervious area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NATITRAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1067.500(Ft.)
End of natural channel elevation = 1055.700(Ft.)
, Length of natural channel = 1255.000(Ft.)
Estimated mean flow rate at midpoint of channel = 37.643(CFS)
Natural valley channel type used
, L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + S(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.46(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Nonnal channel slope = 0.0094
Corrected/adjusted channel slope = 0.0094
Travel time = 6.04 min. TC = 22.30 min.
'
'
'
'
'
'
'
'
~
'
'
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.241(In/Hr) for a 100.0 year storm
Subarea runoff.= 27.283(CFS) for 15.800(Ac.)
Total runoff = 48.312(CFS) Total area = 25.800(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 103.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1055.700(Ft.)
End of natural channel elevation = 1055.000(Ft.)
Length of natural channel = 370.000(Ft.)
Estimated mean flow rate at midpoint of channel = 66.102(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 1.83(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Norntal channel slope = 0.0019
Corrected/adjusted channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min.
~~
'
Adding area flow to channel
' UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.762
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
Rainfall intensity = 2.073(In/Hr) for
Subarea runoff = 30.012(CFS) for 19
, Total runoff = 78.324(CFS) Total area
fraction = 0.000
a 100.0 year storm
.000(Ac.)
= 44.800(AC.)
353
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 104.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
' Top of natural channel elevation = 1055.000(Ft.)
End of natural channel elevation = 1051.600(Ft.)
' Length of natural channel = 720.000(Ft.)
Estimated mean flow rate at midpoint of channel = 94.059(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.20(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
, Normal channel slope = 0.0047
Corrected/adjusted channel slope = 0.0047
Travel time = 3.75 min. TC = 29.42 min.
'
,
'
'
~I
~
,
'
Adding area flow to channel
UNDE~IELOPED (poor cover) subarea
Runoff Coefficient = 0.753
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.924(In/Hr) for a 100.0 year storm
Subarea runoff = 26.069(CFS) for 18.000(AC.)
Total runoff = 104.393(CFS) Total area =. 62.800(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 104.000 to Point/Station 105.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1051.600(Ft.)
End of natural channel elevation = 1050.600(Ft.)
Length of natural channel = 400.000(Ft.)
Estimated mean flow rate at midpoint of channel = 121.348(CFS)
, Natural valley channel type used ~~'~
'
1
'
'
1
'
,
~
'
~
1
3 5~{
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + S(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.52(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
Travel time = 2.65 min. TC = 32.07 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.747
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.835(In/Hr) for a 100.0 year storm
Subarea runoff = 27.954(CFS) for 20.400(Ac.)
Total runoff = 132.347(CFS) Total area = 83.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1050.600(Ft.)
End of natural channel elevation = 1048.000(Ft.)
Length of natural channel = 650.000(Ft.)
Estimated mean flow rate at midpoint of channel = 149.367(CFS)
Natural valley channel type used
' L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + S(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.39(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nornlal channel slope = 0.0040
Corrected/adjusted channel slope = 0.0040
Travel time = 3.20 min. TC = 35.27 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.758
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.700
Decimal fraction soil group C= 0.300
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 80.40
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.741(In/Hr) for a 100.0
Subarea runoff = 28.261(CFS) for 21.400(Ac.)
Total runoff = 160.608'(CFS) Total area = 104
= 0.000
year stornl
600(AC.)
\2~
,
355
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 106.000 to Point/Station 106.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nonnal stream number 1
' Stream flow area = 104.600(AC.)
Runoff from this stream = 160.608(CFS)
Time of concentration = 35.27 min.
' Rainfall intensity = 1.741(In/Hr)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 1.691(In/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.765
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.530
Decimal fraction soil group C= 0.470
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 81.76
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
' TC = 37.19 min. Rain intensity = 1.69(In/Hr)
Total area = 802.70(AC.) Total runoff = 1271.76(CFS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 108.000
**** IMPROVED CHANNEL TRAVEL TIME ****
~ Upstream point elevation = 1060.000(Ft.)
Downstream point elevation = 1041.500(Ft.)
' Channel length thru subarea = 1650.000(Ft.)
Channel base width 5.000(Ft.)
Slope or ~Z' of left channel bank = 2.000
' Slope or 'Z' of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel = 1281.266(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 7.200(Ft.)
, Flow(q) thru subarea = 1281.266(CFS)
Depth of flow = 6.260(Ft.), Average velocity = 11-.682(Ft/s)
Channel flow top width = 30.041(Ft.)
' Flow Velocity-= 11.68(Ft/s)
Travel time 2.35 min.
Time of concentration = 39.54 min.
Sub-Channel No. 1 Critical depth = 6.500(Ft.)
' ' ' Critical flow top width = 31.000(Ft.)
' ' ' Critical flow velocity= 10.951(Ft/s)
' ' ' Critical flow area = 117.000(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.763
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
~
Decimal fraction soil group C= 0.500 ~7i
1
~
~
,
,
~
~
~
!
~
35~
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.635tIn/Hr) for a 100.0 year stornt
Subarea runoff = 14.978(CFS) for 12.000(Ac.)
Total runoff = 1286.738(CFS) Total area = 814.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 108.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal stream number 2
Stream flow area = 814.700(Ac.)
Runoff from this stream = 1286.738(CFS)
Time of concentration = 39.54 min.
Rainfall intensity = 1.635(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 160.608 35.27
2 1286.738 39.54
Largest stream flow has longer
Qp = 1286.738 + sum of
Qb Ia/Ib
160.608 * 0.939 =
Qp = 1437.556
1.741
1.635
time of concentration
150.818
Total of 2 streams to confluence:
Flow rates before confluence point:
160.608 1286.738
Area of streams before confluence:
104.600 814.700
Results of confluence:
Total flow rate = 1437.556(CFS)
Time of concentration = 39.541 min.
Effective stream area after confluence = 919.300(Ac.)
' +++++++++++++++++++,+++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** IMPROVED CHANNEL TRAVEL TIME ****
~
~
I:~
''~
~
Upstream point elevation = 1041.500(Ft.)
Downstream point elevation = 1025.000(Ft.)
Channel length thru subarea = 2350.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or ~Z~ of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.015
Maximum depth of channel = 8.000(Ft.)
Flow(q) thru subarea = 1451.630(CFS)
Depth of flow = 5.404(Ft.), Average velocity =
Channel flow top width = 26.616(Ft.)
Flow Velocity = 16.99(Ft/s)
Travel time = 2.30 min.
1451.630(CFS)
16.993(Ft/s)
`2°~
1~ Time of concentration = 41.85 min.
~ Sub-Channel No. 1 Critical depth = 6.875(Ft.)
' ' ' Critical flow top width = 32.500(Ft.)
' ' ' Critical flow velocity= 11.261(Ft/s)
~ ' ' ' Critical flow area = 128.906(Sq.Ft)
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.760
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 1.585(In/Hr) for a 100.0 year storm
Subarea runoff = 21.674(CFS) for 18.000(Ac.)
~ Total runoff = 1459.230(CFS) Total area = 937.300(Ac.)
357
,., ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~~ Process from Point/Station 109.000 to Point/Station 109.000
**** CONFLUENCE OF MAIN STREAMS ****
~ The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 937.300(AC.)
~ Runoff from this stream = 1459.230(CFS)
Time of concentration = 41.85 min.
' ' Rainfall intensity = 1.585(In/Hr)
Program is now starting with Main Stream No. 2
~'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 110.000 to Point/Station 111.000
**** INITIAL AREA fiVALUATION ****
Initial area flow distance = 1000.000(Ft.)
~, Top (of initial area) elevation = 1058.000(Ft.)
Bottom (of initial area) elevation = 1045.000(Ft.)
Difference in elevation = 13.000(Ft.)
~ Slope = 0.01300 s(percent)= 1.30
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.021 min.
~ Rainfall intensity = 2.377(In/Hr) for a 100.0 year stornl
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.801
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 12.765(CFS)
Total initial stream area = 6.700(Ac.)
~ Pervious area fraction = 1.000 ~
~
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 3 58
Process from Point/Station 111.000 to Point/Station 112.000
~ **** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1045.000(Ft.)
~ End of natural channel elevation = 1037.000(Ft.)
~' Length of natural channel 960.000(Ft.)
Estimated mean flow rate at midpoint of channel = 19.909(CFS)
~ Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 2.73(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0083
Corrected/adjusted channel'slope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
~ Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
i~ Decimal fraction soil group C= 0.500
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~. Rainfall intensity = 2.065(In/Hr) for a 100.0 year stornl
Subarea runoff = 12.205(CFS) for 7.500(AC.)
~ Total runoff = 24.970(CFS) Total area = 14.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 112.000 to Point/Station 115.000
**** NATURAL CHANN£sL TIMEs' + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1037.000(Ft.)
End of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 560.000(Ft.)
Estimated mean flow rate at midpoint of channel = 27.783(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"fl.5)
Velocity using mean channel flow = 2.63(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0064
Corrected/adjusted channel slope = 0.0064
Travel time = 3.55 min. TC = 29.43 min.
~
~ Adding area flow to channel
UNDEVELOPED (poor cover) subared
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 0.500
`~
I
3s9
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.924(In/Hr) for a 100.0 year storni
~ Subarea runoff = 4.808(CFS) for 3.200(Ac.)
Total runoff = 29.778(CFS) Total area = 17.400(Ac.)
_~: ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
,~ **** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 2 in normal stream number 1
~ Stream flow area = 17.400(AC.)
Runoff from this stream = 29.778(CFS)
Time of concentration = 29.43 min.
Rainfall intensity = 1.924(In/Hr)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
~ **** INITIAL AREA EVALUATION ****
Initial area flow distance = 670.000(Ft.)
~ Top (of initial area) elevation = 1055.200(Ft.)
Bottom (of initial area) elevation = 1047.000(Ft.)
Difference in elevation = 8.200(Ft.)
Slope = 0.01224 s(percent)= 1.22
~, TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.265 min.
~ Rainfall intensity = 2.579(in/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.808
Decimal fraction soil group A- 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
:~; Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.847(CFS)
Total initial stream area = 10.000(Ac.)
~ Pervious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 114.000 to Point/Station 115.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1047.000(Ft.)
End of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 1300.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 35.962(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
,, Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.60(Ft/s) ~
' Correction to map slope used on extremely rugged channels with `2
3Go
~ drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0105
Corrected/adjusted channel slope = 0.0105
Travel time = 6.01 min. TC = 23.28 min.
^ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.794
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 0.500
Decimal fraction soil group C= 0.500
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.188(In/Hr) for a 100.0 year storm
Subarea runoff = 25.189(CFS) for 14.500(AC.)
Total runoff = 46.036(CFS) Total area = 24.500(AC.)
~
~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 2
~~ Stream flow area = 24.500(Ac.)
Runoff from this stream = 46.036(CFS)
Time of concentration = 23.28 min.
~ Rainfall intensity = 2.188(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
~ No. (CFS) (min) (In/Hr)
,
~ 1 29.778 29.43 1.924
2 46.036 23.28 2.188
Largest stream flow has longer or shorter time of concentration
~ Qp = 46.036 + sum of
~ Qa Tb/Ta
29.778 * 0.791 = 23.553
Qp = 69.590
~ Total of 2 streams to confluence:
Flow rates before confluence point:
~ 29.778 46.036
Area of streams before confluence:
17.400 24.500
~ Results of confluence:
Total flow rate = 69.590(CFS)
Time of concentration = 23.277 min.
EPfective stream area after confluence = 41.900(AC.)
~
++++++++++++±+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 118.000
~ **** NATURAL CFIANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1033.400(Ft.) ~
~ End of natural channel elevation = 1030.500(Ft.) `
j 3~i
Length of natural channel = 730.000(Ft.)
,~ Estimated mean flow, rate at midpoint of channel = 71.251(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
,~ Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.70(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0040
,~ Corrected/adjusted channel slope = 0.0040
Travel time = 4.50 min. TC = 27.78 min.
, Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.784
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.986(In/Hr) for a 100.0 year storm
~ Subarea runoff = 3.115(CFS) for 2.000(Ac.)
Total runoff = 72.705(CFS) Total area = 43.900(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 118.000
**** CONFLUENCE OF MINOR STREAMS ****
~~ Along Main Stream number: 2 in normal stream number 1
Stream flow area = 43.900(AC.)
;~ Runoff from this stream = 72.705(CFS)
, Time of concentration = 27.78 min.
' Rainfall intensity = 1.986(In/Hr)
.~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 117.000
~ ~ **** INITIAL AREA EVALUATION ****
~~~
Initial area flow distance = 1000.000(Ft.)
,i Top (of initial area) elevation = 1053.900(Ft.)
Bottom (of initial area) elevation = 1042.300(Ft.)
~
~ Difference in elevation = 11.600(Ft.)
Slope = 0.01160 s(percent)= 1.16
~ TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.483 min.
Rainfall intensity = 2.348(In/Hr) for a 100.0 year storm
~ UNDEVELOPED (poor cover) subarea
~~ Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000 ~~/~'
~
~
Initial subarea runoff =
.~ Total initial stream area =
Pervious area fraction = 1.
Adding area flow to channel
UNDEVELOPBD (poor cover) subarea
Runoff Coefficient = 0.783
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.966(In/Hr) for a 100.0 year storm
Subarea runoff = 21.567(CFS) for 14.000(AC.)
Total runoff = 39.040(CFS) Total area = 23.300(Ac.)
3G2
,~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~- Top of natural channel elevation = 1042.300(Ft.)
End of natural channel elevation = 1030.500(Ft.)
Length of natural channel = 1430.000(Ft.)
~, Estimated mean flow rate at midpoint of channel = 30.625(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.06(Ft/s)
~, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0083
Corrected/adjusted channel slope = 0.0083
Travel time = 7.79 min. TC = 28.27 min.
~
i~
,~
~
~
,~
~
'
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station. 118.000 to Point/Station 118.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main 5tream number: 2 in nonnal stream number 2
Stream flow area = 23.300(Ac.)
Runoff from this stream = 39.040(CFS)
Time of concentration = 28.27 min.
Rainfall intensity = 1.966(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
17.473(CFS)
9.300(AC.)
000
Rainfall Intensity
(In/Hr)
1 72.705 27.78 1.986
2 39.040 28.27 1.966
Largest stream flow has longer or shorter time of concentration
Qp = 72.705 + sum of
Qa Tb/Ta
~~
~
39.040 * 0.982 = 38.353
~ Qp = 111.058
Total of 2 streams to confluence:
Flow rates before confluence point:
~ 72.705 39.040
` Area of streams before confluence:
43.900 23.300
Results of confluence:
~ Total flow rate = 111.058(CFS)
~ Time of concentration = 27.775 min.
~ Effective stream area after confluence =
67.200(AC.)
3~3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 122.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~iop oL natural channel elevation = 1030.500(Ft.)
End of natural channel elevation = 1028.000(Ft.)
Length of natural channel = 990.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 116.016(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.49(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
Travel time = 6.61 min. TC = 34.39 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
RunofE Coefficient = 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.766(In/Ar) for a 100.0 year storm
Subarea runoff = 8.178(CFS) for 6.000(Ac.)
Total runoff = 119.236(CFS) Total area = 73.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 73.200(AC.)
Runoff from this stream = 119.236(CFS)
Time of concentration = 34.39 min.
Rainfall intensity = 1.766(In/Hr)
\~~
~ 3c4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
, **** INITIAL AREA EVALUATION ****
~
~
~,
Initial area flow distance = 540.000(Ft.)
Top (of initial area) elevation = 1051.200(Ft.)
Bottom (of initial area) elevation = 1045.500(Ft
Difference in elevation = 5.700(Ft.)
Slope = 0.01056 s(percent)= 1.06
TC = k(0.530)*[(length"3)/(elevation change)]
Initial area time of concentration = 16.313
Rainfall intensity = 2.661(In/Hr) for a
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.811
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious
Initial subarea runoff = 21.575(CFS)
Total initial stream area = 10.000(Ac
Pervious area fraction = 1.000
"0.2
min.
100.0 year stonn
fraction = 0.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
_ Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNSL TIME + SUBAREA FLOW ADDITION ****
~~
,~.
Top of natural channel elevation = 1045.500(Ft.)
End of natural channel elevation = 1038.000(Ft.)
Length of,natural channel = 870.000(Ft.)
Estimated mean flow rate at midpoint of channel =
38.188(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)~.352)(slope~0.5)
Velocity using mean channel flow = 3.33(Ft/s)
~, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0086
Corrected/adjusted channel slope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
~
,~
~'
,
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.336(In/Hr) for a 100.0 year storm
Subarea runoff = 28.772(CFS) for 15.400(Ac.)
Total runoff = 50.347(CFS) Total area = 25.400(AC.)
`~
1 3~5
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNEL TIME + SUBARfiA FLOW ADDITION ****
~ Top of natural
End of natural channel elevation =
channel elevation = 1038.000(Ft.)
1028.000(Ft.)
Length of natural channel = 1140 .000(Ft.)
Estimated mean flow rate at midpoint of channel = 66.998(CFS)
~
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"'0.5)
~ Velocity using mean channel flow = 3.95(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0088
Corrected/adjusted channel slope = 0.0088
~ Travel time = 4.81 min. TC = 25.48 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
'` Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.082(In/Hr) for a 100.0 year storm
~ Subarea runoff = 27.599(CFS) for 16.800(AC.)
Total runoff = 77.947(CFS) Total area = 42.200(AC.)
~ . ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 122.000 to Point/Station 122.000
**** CONFLUENCE OF MINOR STREAMS ****
~
~
~
Along Main Stream number: 2 in normal stream number 2
Stream flow area = 42.200(AC.)
Runoff from this stream = 77.947(CFS)
Time of concentration = 25.48 min.
Rainfall intensity = 2.082(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~ 1
2
~ La
4P
~. 4P
119.236 34.39
77.947 25.48
rgest stream flow has longer
= 119.236 + sum of
Qb Ia/Ib
77.947 * 0.848 =
= 185.338
1.766
2.082
time of concentration
66.102
~ Total of 2 streams to confluence: ~`+j3
Flow rates before confluence point:
~ 36b
119.236 77.947
~ Area of streams before confluence:
73.200 42.200
Results of confluence:
~ Total flow rate = 185.338(CFS)
Time of concentration = 34.390 min.
Effective stream area after confluence = 115.400(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
~ **** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
, In Main Stream number: 2
Stream flow area = 115.400(Ac.)
Runoff from this stream = 185.338(CFS)
Time of concentration = 34.39 min.
~ Rainfall intensity = 1.766(In/Hr)
Summary of stream data:
, Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~
~
~
~
~
1 1459.230 41.85
2 185.338 34.39
Larg est stream flow has longer
Qp = 1459.230 + sum of
Qb Ia/Ib
185.338 * 0.898 =
Qp = 1625.607
1.585
1.766
time of concentration
166.377
Total of 2 main streams to confluence:
Flow rates before confluence point:
1459.230 185.338
Area of streams before confluence:
937.300 115.400
Results of confluence:
Total flow rate = 1625.607(CFS)
Time of concentration = 41.846 min.
Effective stream area after confluence
Fnd of computations, total study area =
The following figures may
be used for a unit hydrograph study of
= 1052.700(AC.)
1052.70 (Ac.)
the same area.
~ Area averaged pezvious area fraction(Ap) = 1.000
Area averaged RI index number = 81.5
,~
~
~ , \`~~
~ ~O'
~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264AEX.out
~ ------------------------------------------------------------------------
TR 30264 EXISTING CONDITION EXLUDING OFF-SITES
100 YEAR STORM
~ JN 32006
' ------------------------------------------------------------------------
******~** HydYOlOyy Study COritT01 InfOxtndtiOn **********
~ English (in-lb) Units used in input data file
, ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
~ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
1 For the [ Murrieta,Tmc,Rnch CaNorco ] area used.
10 year storm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
~ 100 year stonn 10 minute intensity = 3.480(In/Hr)
100 year storm 60 minute intensity = 1.300(In/Hr)
Storm event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
r
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
~ **** INITIAL AREA EVALUATION ****
Initial area flow distance = 1000.000(Ft.)
~ Top (of initial area) elevation = 1148.000(Ft.)
Bottom (of initial area) elevation = 1130.300(Ft.)
Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1.77
~ TC = k(0.530)*[(length"3)/(elevation change)]~0.2
Initial area time of concentration = 18.823 min.
Rainfall intensity = 2.460(In/Hr) for a 100.0 year storm
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
1 Pervious area fraction = 1.000; Impervious fraction = 0.000 \`~75
, ~02
Initial subarea runoff = 19.200(CFS)
Total initial stream area = 10.000(AC.)
~ Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
' Top of natural channel elevation = 1130.300(Ft.)
- End of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 37.440(CFS)
Natural valley channel type used
, L.A. County flood control district fornlula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.45(Ft/s)
, Correction to map slope used on extremely rugged channels with
- drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0156
~ Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 min. TC = 22.49 min.
, Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.770
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 2.230(In/Hr) for a 100.0 year storm
Subarea runoff = 32.632(CFS) for 19.000(AC.)
~ Total runoff = 51.832(CFS) Total area = 29.000(AC.)
~' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 103.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1115.000(Ft.)
End of natural channel elevation = 1100.500(Ft.)
~ Length of natural channel = 1020.000(Ft.)
Estimated mean flow rate at midpoint of channel = 67.203(CFS)
, Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)~.352)(slope~0.5)
~ Velocity using mean channel flow = 5.03(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0142
~' Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min. ~?~v
~'
~
~~3
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year storm
~ Subarea runoff = 27.039(CFS) for 17.200(AC.)
Total runoff = 78.870(CFS) Total area = 46.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~
~
~
~
~
~
'
Top of natural channel elevation = 1100.500(Ft.)
End of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 420.000(Ft.)
Estimated mean flow rate at midpoint of channel = 79.297(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.69(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-.6.2)
Normal channel slope = 0.0112
Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.758
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.002(In/Hr) for a 100.0 year storm
Subarea runoff = 0.758(CFS) for 0.500(AC.)
Total runoff = 79.629(CFS) Total area = 46.700(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
^ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
~ Stream flow area = 46
Runoff from this stream =
Time of concentration =
Rainfall intensity =
'
1 in norntal stream number 1
.700(AC.)
79.629(CFS)
27.36 min.
2.002(In/Hr) ~~1
,
,
~
~
LJ
'
LJ
~
!_J
'
~
~
~
~
~
,
~0 4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 104.000 to Point/Station 105.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 785.000(Ft.)
Top (of initial area) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.000(Ft
Difference in elevation = 14.000(Ft.)
Slope = 0.01783 s(percent)= 1.78
TC = k(0.530)*[(length"3)/(elevation change)]
Initial area time of concentration = 17.060
Rainfall intensity = 2.596(In/Hr) for a
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
Instial subarea runoff = 20.410(CFS)
Total initial stream area = 10.000(Ac
Pervious area fraction = 1.000
"0
min.
100.0 year storm
fraction = 0.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1133.000(Ft.)
End of natural channel elevation = 1116.000(Ft.)
Length of natural channel = 1175.000(Ft.)
Estimated mean flow rate at midpoint of channel = 32.655(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
VeloCity(ft/s) _ (7 + 8(g(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.12(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls tPlate D-6.2)
Normal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC,2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.268(In/Hr) for a 100.0 year stonti
Subarea runoff = 21.013(CFS) for 12.000(AC.)
Total runoff = 41.423(CFS) Total area = 22.000(AC.)
`~j$
' ~OI
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 107.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1116.000(Ft.)
End of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
' Estimated mean flow rate at midpoint of channel = 50.366(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.91(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0160
~ Corrected/adjusted channel slope = 0.0160
Travel time = 4.28 min. TC = 26.08 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.761
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impenrious fraction = 0.000
Rainfall intensity = 2.056(In/Hr) for a 100.0 year storm
~ Subarea runoff = 14.857(CFS) for 9.500(AC.)
Total runoff = 56.279(CFS) Total area = 31.500(AC.)
,
lJ'
~
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 31.500(AC.)
Runoff from this stream = 56.279(CFS)
Time of concentration = 26.08 min.
Rainfall intensity = 2.056(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 79.629 27.36
2 56.279 26.08
~ Largest stream flow has longer
Qp = 79.629 + sum of
Qb Ia/Ib
~ 56.279 * 0.974 =
Qp = 134.443
Rainfall Intensity
(In/Hr)
2.002
2.056
time of concentration
54.815
~ Total of 2 streams to confluence: ~3~
, Flow rates before confluence point:
, 79.629 56.279
Area of streams before confluence:
,- 46.700 31.500
Results of confluence:
~ Total flow rate = 134.443(CFS)
Time of concentration = 27.365 min.
Effective stream area after confluence = 78.200(AC.)
G o$
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 107.000 to Point/Station 110.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1095.800(Ft.)
' End of natural channel elevation = 1087.500(Ft.)
Length of natural channel 910.000(Ft.)
Estimated mean flow rate at midpoint of channel = 143.899(CFS)
' Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalls (Plate D-6.2)
Nonnal channel slope = 0.0091
Corrected/adjusted channel slope = 0.0091
~ Travel time = 3.00 min. TC = 30.36 min.
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
^ Total runoff = 150.057(CFS) Total area = 89.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCE OF MINOR STREAMS ****
~
~
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 89.200(AC.)
Runoff from this stream = 150.057(CFS)
Time of concentration = 30.36 min.
Rainfall intensity = 1.891(In/Hr)
I ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA EVALUATION **** ~~W
'
~o~
' Initial area flow distance = 710.000(Ft.)
, Top (of initial area) elevation = 1112.000(Ft.)
Bottom (of initial area) elevation = 1100.o00(Ft.)
Difference in elevation = 12.000(Ft.)
Slope = 0.01690 s(percent)= 1.69
~ TC = k(0.530)*[(length~3)/(elevation change)]"0.2
Initial area time of concentration = 16.565 min.
Rainfall intensity = 2.639(In/Hr) for a 100.0 year storm
' UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 17.875(CFS)
Total initial stream area = 8.600(AC.)
, Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 109.000 to Point/Station 110.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
~ Top of natural channel elevation = 1100.000(Ft.)
End of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 25.046(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.51(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0121
, Corrected/adjusted channel slope = 0.0121
Travel time = 4.89 min. TC = 21.46 min.
' Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.773
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.289(In/Hr) for a 100.0 year stornt
~ Subarea runoff = 12.206(CFS) for 6.900(AC.)
Total runoff = 30.081(CFS) Total area = 15.500(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCE OF MINOR STREAMS **** ~~l
, `
~i~
Along Main Stream number: 1 in nozmal stream number 2
Stream flow area = 15.500(Ac.)
Runoff from this stream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall intensity = 2.289(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 150.057 30.36 1.891
2 30.081 21.46 2,289
Largest stream flow has longer time of concentration
Qp = 150.057 + sum of
Qb Ia/Ib
30.081 * 0.826 = 24.853
Qp = 174.910
Total of 2 streams to confluence:
Flow rates before confluence point:
150.057 30.081
Area of streams before confluence:
89.200 15.500
Results of confluence:
Total flow rate = 174.910(CFS)
Time of concentration = 30.362 min.
Effective stream area after confluence = 104.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 123.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1087.500(Ft.)
End of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 675.000(Ft.)
Estimated mean flow rate at midpoint of channel = 189.778(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.44(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0059
Corrected/adjusted channel slope = 0.0059
Travel time = 2.53 min. TC = 32.89
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78. 00
Pervious area fraction = 1.000; impervious
min.
~pa2
fraction = 0.000
~iI
,
~
~
~
'
~
Rainfall intensity = 1.809(In/Hr) for a 100.0 year stozm
Subarea runoff = 23.997(CFS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 122.500(AC.)
Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intensity = 1.809(In/Hr)
Program is now starting with Main Stream No. 2
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 111.000 to Point/Station 112.000
**** INITZAL AREA EVALUATION ****
~
u
~J
~
~
'
LJ
L.1
,
~
~
Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1143.000(Ft.)
Bottom (of initial area) elevation = 1135.300(Ft.
Difference in elevation = 7.700(Ft.)
Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 14.668 min.
Rainfall intensity = 2.821(In/Hr) for a 100
UNDEVELOPED (poor.cover) subar.ea
Runoff Coefficient = 0.815
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
0 year storm
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 23.004(CFS)
Total initial stream area = 10.000(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 112.000 to Point/Station 113.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1135.300(Ft.)
End of natural channel elevation = 1122.800(Ft.)
Length of natural channel = 810.000(Ft.)
Estimated mean flow rate at midpoint of channel = 44.858(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.66(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0154
~a3
, Corrected/adjusted channel slope = 0.0154
, Travel time = 2.90 min. TC = 17.56 min.
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 2.555(In/Hr) for a 100.0
Subarea runoff = 39.199(CFS) for 19.000(AC.)
, Total runoff = 62.203(CFS) Total area = 29
- 0.000
year stonn
000(AC.)
~I2
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1122.800(Ft.)
End of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 82.580(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel f7.ow = 4.75(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
' Corrected/adjusted channel slope = 0.0112
Travel time = 3.68 min. TC = 21.25 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.774
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.301(In/Ar) for a 100.0 year storm
' Subarea runoff = 33.820(CFS) for 19.000(Ac.)
Total runoff = 96.023(CFS) Total area = 48.000(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 114.000 to Point/Station 114.000
~ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 48.000(Ac.) `~
' Runoff from this stream = 96.023(CFS)
Gij
, Time of concentration = 21.25 min.
, Rainfall intensity = 2.301(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 115.000 to Point/Station 115.100
**** INITIAL AREA EVALUATION ****
,
'
,
~
,
LJ
~
~
Initial area flow distance = 770.000(Ft.)
Top (of initial area) elevation = 1141.000(Ft.)
Bottom (of initial area) elevation = 1130.o00(Ft.)
Difference in elevation = 11.000(Ft.)
Slope = 0.01429 s(percent)= 1.43
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.697 min.
Rainfall intensity = 2.544(In/Hr) for a 100.
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
0 year storm
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.126(CFS)
Total initial stream area = 9.800(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.100 to Point/Station 116.000
***t NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1130.000(Ft.)
End of natural channel elevation = 1106.500(Ft.)
Length of natural channel = 1340.000(Ft.)
Estimated mean flow rate at midpoint of channel = 30.806(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.47(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0175
Corrected/adjusted channel slope = 0.0175
Travel time = 5.00 min. TC = 22.70 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.795
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000 `~j
Rainfall intensity = 2.219(In/Hr) for a 100.0 year storm \'"
' ~~
Subarea runoff = 18.350(CFS) for 10.400(AC.)
, Total runoff = 38.476(CFS) Total area = 20.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 2 in nonnal stream number 2
Stream flow area = 20.200(Ac.)
Runoff from this stream = 38.476(CFS)
~ Time of concentration = 22.70 min.
Rainfall intensity = 2.219(In/Ar)
Summary of stream data:
, Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
, 1 96.023 21.25 2.301
2 38.476 22.70 2.219
Largest stream flow has longer or shorter time of concentration
, Qp = 96.023 + sum of
Qa Tb/Ta
38.476 * 0.936 = 36.020
' Qp = 132.042
Total of 2 streams to confluence:
' Flow rates before confluence point:
96.023 38.476
Area of streams before confluence:
48.000 20.200
, Results of confluence:
Total flow rate = 132.042(CFS)
Time of concentration = 21.247 min.
, Effective stream area after confluence = 68.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 116.000 to Point/Station 123.000
**** IMPROVED CHANNEL TRAVEL TIME ****
, Upstream point elevation = 1106.500(Ft.)
Downstream point elevation = 1083.500(Ft.)
Channel length thru subarea = 1970.000(Ft.)
~ Channel base width = 25.000(Ft.)
Slope or 'Z' of left channel bank = 15.000
Slope or ~Z~ of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel = 142.110(CFS)
' Manning's 'N' = 0.030 -
Maximum depth of channel 2.500(Ft.)
Flow(q) thru subarea = 142.110(CFS)
, Depth of flow = 0.958(Ft.), Average velocity = 4.475(Ft/s)
Channel flow top width = 41.290(Ft.)
Flow Velocity = 4.47(Ft/s)
' Travel time = 7.34 min.
Time of concentration = 28.58 min.
Sub-Channel No. 1 Critical depth = 0.898(Ft.)
, ' ' ' Critical flow top width = 40.273(Ft.) ~~~
~IS
Critical flow velocity= 4.847(Ft/s)
Critical flow area = 29.322(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.755
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.955(In/Hr) for a 100.0 year storm
Subarea runoff = 15.343(CFS) for 10.400(AC.)
Total runoff = 147.385(CFS) Total area = 78.600(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
, In Main Stream number: 2
Stream flow area = 78.600(AC.)
Runoff from this stream = 147.385(CFS)
' Time of concentration = 28.58 min.
Rainfall intensity = 1.955(in/Hr)
Program is now starting with Main Stream No. 3
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 117.000
, **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.617(In/Hr) for a 100.0 year storm
, SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
' Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 16.82 min. Rain intensity = 2.62(In/Hr)
, Total area = 62.70(Ac.) Total runoff = 129.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1118.000(Ft.)
End of natural channel elevation = 1101.000(Ft.)
Length of natural channel = 790.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 138.258(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity: ~1
, Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5) ~
~16
, Velocity using mean channel flow = 7.68(Ft/s)
,
~
t
~~~
'
~
~
~
'
,
~
,
,
LJ
~
,
'
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0215
Corrected/adjusted channel slope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.782
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.480(In/Hr) for a 100.0 year stonn
Subarea runoff = 17.447(CFS) for 9.000(AC.)
Total runoff = 146.447(CFS) Total area = 71.700(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 121.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
End of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 980.000(Ft.)
Estimated mean flow rate at midpoint of channel = 156.251(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.63(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0107
Corrected/adjusted channel slope = 0.0107
Travel time = 2.90 min. TC = 21.44 min.
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.290(In/Hr) for a 100.0 year storm
Subarea runoff = 16.992(CFS) for 9.600(Ac.)
Total runoff = 163.439(CFS) Total area = 81.300(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 121.000 to Point/Station 121.000 ~~
, **** CONFLUENCE OF MINOR STREAMS ****
~~7
Along Main Stream number: 3 in norntal stream number 1
Stream flow area = 81.300(AC.)
Runoff from this stream = 163.439(CFS)
Time of concentration = 21.44 min.
Rainfall intensity = 2.290(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 920.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1094.000(Ft.
Difference in elevation = 66.000(Ft.)
Slope = 0.07174 s(percent)= 7.17
TC = k(0.480)*[(length"3)/(elevation change)7"0.2
Initial area time of concentration = 12.462 min.
Rainfall intensity = 3.086(In/Hr) for a 100
SINGLE FAMILY (1 Acre Lot)
Runoff Coefficient = 0.718
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
0 year storm
' Pervious area fraction = 0.800; Impervious fraction = 0.200
Initial subarea runoff = 7.085(CFS)
Total initial stream area = 3.200(Ac.)
Pervious area fraction = 0.800
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1094.000(Ft.)
' End of natural channel elevation = 1090.500(Ft.)
Length of natural channel 560 .000(Ft.)
Estimated mean flow rate at midpoint of channel = 9.520(CFS)
! Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
, Velocity using mean channel flow = 1.95(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0063
Corrected/adjusted channel slope = 0.0063
, Travel time = 4.78 min. TC = 17.25 min.
' Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000 ~~~
, Decimal fraction soil group B= 1.000
'
'
i~
~'
,
'
~
,
~i
I~
1
'
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(In/Hr) for a 100.0 year storm
Subarea runoff = 4.460(CFS) for 2.200(AC.)
Total runoff = 11.545(CFS) Total area = 5.400(Ac.)
6~8
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 3 in normal stream number 2
Stream flow area = 5.400(Ac.)
Runoff from this Stream = 11.545(CFS)
Time of concentration = 17.25 min.
Rainfall intensity = 2.581(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 163.439 21.44 2.290
2 11.545 17.25 2.581
Largest stream flow has longer time of concentration
Qp = 163.439 + sum of
Qb Ia/Ib
11.545 * 0.887 = 10.243
Qp = 173.682
Total of 2 streams to confluence:
, Flow rates before confluence point:
163.439 11.545
' Area of streams before confluence:
81.300 5.400
Resul ts of confluence:
Total flow rate = 173.682(CFS)
' Time of concentration = 21.438 min.
Effec tive stream area after confluence =
'
~
~
,
,
'
86.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITZON ****
Top of natural channel elevation = 1090.500(Ft.)
End of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.)
Estimated mean flow rate at midpoint of channel = 192.512(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.93(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0046
`So
' G~9
Corrected/adjusted channel slope = 0.0046
I, Travel time = 3.14 min. TC = 24.58 min.
Adding area flow to channel
, UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.765
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.124(In/Hr) for a 100.0 year storm
Subarea runoff = 30.531(CFS) for 18.800(AC.)
' Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
, Top of natural channel elevation = 1087.100(Ft.)
End of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
' Estimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type used
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.08(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nornial channel slope = 0.0026
, Corrected/adjusted channel slope = 0.0026
Travel time = 7.36 min. TC = 31.94 min.
' Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.747
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.839(In/Hr) for a 100.0 year storni
' Subarea runoff = 12.915(CFS) for 9.400(AC.)
Total runoff = 217.127(CFS) Total area = 114.900(Ac.)
,
,
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 3
Stream flow area = 114.900(AC.)
`5~
,
'
~
~I
u
'~
'
1
1
'
'
,
'
,
~
u
'
~
,
'
Runoff from this stream = 217.127(CFS)
Time of concentration = 31.94 min.
Rainfall intensity = 1.839(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 198.907 32.89 1.809
2 147.385 28.58 1.955
3 217.127 31.94 1.839
Largest stream flow has longer or shorter time
Qp = 217.127 + sum of
Qa Tb/Ta
198.907 * 0.971 = 193.139
Qb Za/Ib
147.385 * 0.941 = 138.656
Qp = 548.922
Total of 3 main streams to confluence:
Flow rates before confluence point:
198.907 147.385 217.127
Area of streams before confluence:
122.500 78.600 114.900
of concentration
Results of confluence:
Total flow rate = 548.922(CFS)
Time of concentration = 31.940 min.
Effective stream area after confluence = 316.000(AC.)
620
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 129.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1083.500(Ft.)
Downstream point elevation = 1061.500(Ft.)
Channel length thru subarea = 910.000(Ft.)
Channel base width = 4.000(Ft.)
Slope or 'Z~ of left channel bank = 2.000
Slope or ~Z~ of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 551.962(CFS)
Depth of flow = 3.785(Ft.), Average velocity =
Channel flow top width = 19.142(Ft.)
Flow Velocity = 12.60(Ft/s)
Travel time = 1.20 min.
Time of concentration = 33.14 min.
551.962(CFS)
12.601(Ft/s)
Sub-Channel No. 1 Critical depth = 4.563(Ft.)
' ' ' Critical flow top width = 22.250(Ft.)
' ' ' Critical flow velocity= 9.217(Ft/s)
' ' ' Critical flow area = 59.883(Sq.Ft)
~v
Adding area flow to channel ~~
UNDEVELOPED (poor cover) subarea
~ G ~
, Runoff Coefficient = 0.745
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.802(In/Hr) for a 100.0 year storm
, Subarea runoff = 4.696(CFS) for 3.500(AC.)
Total runoff = 553.618(CFS) Total area = 319.500(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
, The following data inside Main Stream is listed:
In Main Stream number: 1
, Stream flow area = 319.500(AC.)
Runoff from this stream = 553.618(CFS)
Time of concentration = 33.14 min.
Rainfall intensity = 1.802(In/Hr)
, Program is now starting with Main Stream No. 2
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 124.000
**** INITIAL AREA EVALUATION ****
~ Initial area flow distance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1088.000(Ft.)
, Difference in elevation = 72.000(Ft.)
Slope = 0.08372 s(percent)= 8.37
TC = k(0.530)*[(length"3)/(elevation change)]"'0.2
' Initial area time of concentration = 12.987 min.
Rainfall intensity = 3.016(In/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.800
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Initial subarea runoff = 7.724(CFS)
Total initial stream area = 3.200(Ac.)
Pervious area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
' **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1088.000(Ft.)
, Downstream point elevation = _1079.000(Ft.)
Channel length thru subarea 390.000(Ft.)
Channel base width 17.000(Ft.) ~~j
Slope or ~Z~ of left channel bank = 2.000 ~~
' Slope or 'Z~ of right channel bank = 5.000
' Estimated mean flow rate at midpoint of channel =
8.690(CFS)
' Manning's 'N' = 0.030 -
Maximum depth of channel 1.000(Ft.)
Flow(q) thru subarea = 8.690(CFS)
Depth of flow = 0.198(Ft.), Average velocity = 2.484(Ft/s)
' Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
, Time of concentration = 15.60 min.
Sub-Channel No. 1 Critical depth = 0.199(Ft.)
' ' ' Critical flow top width = 18.395(Ft.)
, ~ ' ' Critical flow velocity= 2.465(Ft/s)
' ' ' Critical flow area = 3.526(Sq.Ft)
' Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.791
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.727(In/Hr) for a 100.0 year stozm
~ Subarea runoff = 1.725(CFS) for 0.800(AC.)
Total runoff = 9.450(CFS) Total area = 4.000(AC.)
622
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
**** CONFLUENCE OF MINOR STREAMS ****
, Along Main Stream number: 2 in normal stream number 1
Stream flow area = 4.000(Ac.)
' Runoff from this stream = 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall intensity = 2.727(In/Hr)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 125.000
' **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Hr) for a 100.0 year storm
' SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.400
~ Decimal fraction soil group C= 0.600
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 63.80
~ Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 25.00 min. Rain intensity = 2.10(In/Hr)
' Total area = 118.00(Ac.) Total runoff = 293.20(CFS)
~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 125.000 to Point/Station 125.000
, ' **** CONFLUENCE OF MINOR STREAMS ****
~
~
G23
Along Main Stream number: 2 in normal stream number 2
Stream flow area = 118.000(AC.)
Runoff from this stream = 293.200(CFS)
Time of concentration = 25.00 min.
Rainfall intensity = 2.104(In/Hr)
Summary of stream data:
~, Stream Flow rate TC
No. (CFS) (min)
'
~
~
~
i
~
~
~
~
~
'
L
~
~
Rainfall Intensity
(In/Hr)
1 9.450 15.60 2.727
2 293.200 25.00 2.104
Largest stream flow has longer time of concentration
Qp = 293.200 + sum of
Qb Ia/Ib
9.450 * 0.772 = 7.292
Qp = 300.492
Total of 2 streams to confluence:
Flow rates before confluence point:
9.450 293.200
Area of streams before confluence:
4.000 118.000
Results of confluence:
Total flow rate = 300.492(CFS)
Time of concentration = 25.000 min.
Effective stream area after confluence = 122.000(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 126.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1079.000(Ft.)
Downstream point elevation = 1073.700(Ft.)
Channel length thru subarea = 870.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or ~Z~ of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 319.211(CFS)
Depth of flow = 3.059(Ft.), Average velocity =
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Ft/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
Sub-Channel No. 1 Critical depth = 2.656(Ft.
' ' ' Critical flow top width =
' ' ' Critical flow velocity=
~ ~ ' Critical flow area = 45
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.757
319.211(CFS)
5.561(Ft/s)
28.906(Ft.)
7.089(Ft/s)
.032(Sq.Ft)
~~
~
Decimal fraction soil group A= 0.000
,~ Decimal
Decimal fraction soil
fraction soil group B=
group C= 1.000
0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78. 00
'I ~ Pervious area fraction = 1.000; Impervious fraction
' Rainfall intensity = 1.992( In/Hr) for a 100.0
Subarea runoff = 22.927(CFS) for 15.200(Ac.)
~, Total ru noff = 323 .419(CFS) Total area = 137
= 0.000
year storm
200(Ac.)
62~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 126.000 to Point/Station 127.000
~ **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1073.700(Ft.)
Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
~ Channel base width = 5.000(Ft.)
Slope or ~Z~ of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
~ Estimated mean flow rate at midpoint of channel = 341.099(CFS)
Manning's 'N' = 0.030
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 341.099(CFS)
~ Depth of flow = 3.846(Ft.), Average velocity = 3.976(Ft/s)
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
~ Travel time = 2.47 min.
~ Time of concentration = 30.08 min.
Sub-Channel No. 1 Critical depth = 2.750(Ft.)
~ ' ' ' Critical flow top width = 29.750(Ft.)
' ' ' Critical flow velocity= 7.139(Ft/s)
' ' ' Critical flow area = 47.781(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
~ Runoff Coefficient = 0.751
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.900(In/Hr) for a 100.0 year stoxm
Subarea runoff = 21.418(CFS) for 15.000(AC.)
Total runoff = 344.837(CFS) Total area = 152.200(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
~ **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1072.300(Ft.)
Downstream point elevation = 1068.900(Ft.)
~ Channel length thru subarea = 620.000(Ft.)
Channel base width - 20.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000 (p
Slope or 'Z' of right channel bank = 40.000 ~5
~
~ Estimated mean flow rate at midpoint of channel =
'
I ~,
,~,
, .~
~
~
+~;
~
Manning~s 'N' = 0.030
Maximum depth of channel =
Flow(q) thru subarea = 359
Depth of flow = 1.690(Ft.),
Channel flow top width = 94
Flow Velocity = 3.72(Ft/s)
Travel time = 2.78 min.
Time of concentration = 32.
Sub-Channel No
~
6.000(Ft.)
564(CFS)
Average velocity =
361(Ft.)
86 min.
1 Critical depth =
' Critical flow
' Critical flow
~ Critical flow
1.367(Ft.)
top width =
velocity= 5
area = 68.
359.564(CFS)
3.721(Ft/s)
80.156(Ft
.252(Ft/s)
466(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.810(In/Hr) for a 100.0
Subarea runoff = 17.538(CFS) for 13.000(Ac.)
Total runoff = 362.376(CFS) Total area = 165
= 0.000
year stoxm
200 (AC. )
675
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
**** IMPROVED CHANNEL TRAVEL TIME ****
~I Upstream point elevation = 1068.900(Ft.)
Downstream point elevation = 1061.500(Ft.)
~ Channel length thru subarea = 750.000(Ft.)
Channel base width 10.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 2.000
~ Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
~ Flow(q) thru subarea = 377.731(CFS)
Depth of flow = 2.986(Ft.), Average velocity =
Channel flow top width = 21.944(Ft.)
~ Flow Velocity-= 7.92(Ft/s)
Travel time 1.58 min.
Time of concentration = 34.44 min.
377.731(CFS)
7.920(Ft/s)
' Sub-Channel No. 1 Critical depth = 2.906(Ft.)
' ' ' ' Critical flow top width = 21.625(Ft.)
~ ~ ~ Critical flow velocity= 8.220(Ft/s)
~ ~ ~ ' Critical flow area = 45.955(Sq.Ft)
Adding area flow to channel
_~ UNDEVELOPED (poor
Runoff Coefficien cover) subarea
t = 0.742
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000 ~~"l
Decimal fraction soil group C= 0.000
6ZG
~~ Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.764(In/Hr) for a 100.0 year storm
Subarea runoff = 18.324(CFS) for 14.000(AC.)
`~ Total runoff = 380.700(CFS) Total area = 179.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
~~
~
~
The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 179.200(Ac.)
Runoff from this stream = 380.700(CFS)
Time of concentration = 34.44 min.
Rainfall intensity = 1.764(In/Hr)
Program is now starting with Main Stream No. 3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
,~
~l
;~r
~
~~
i
,~
r
Rainfall intensity = 2.787(In/Hr) for a 100.0 year stornl
COMMERCIAL subarea type
Runoff Coefficient = 0.875
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C-= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
User specified values are as follows:
TC = 15.00 min. Rain intensity = 2.79(In/Hr)
Total area = 87.00(AC.) Total runoff = 108.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside
In Main Stream number: 3
Stream flow area = 87
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
Main Stream is listed:
.000(AC.)
108.000(CFS)
15.00 min.
2.787(In/Hr)
Stream Flow rate TC Rainfall Intensity
.~. No. (CFS) (min) (In/Hr)
~ 1
2 553.618 33.14
380.700 34.44 1.802
1.764
3 108.000 15.00 2.787
Largest stream flow has longer or shorter time of concentration
~~
, Qp = 553.618 + sum of ~
~z7
Qa Tb/Ta
380.700 * 0.962 = 366.412
Qb Ia/Ib
108.000 * 0.647 = 69.832
4P = 989.862
Total of 3 main streams to confluence:
Flow rates before confluence point:
553.618 380.700 108.000
Area of streams before confluence:
319.500 179.200 87.000
Results of confluence:
Total flow rate = 989.862(CFS)
Time of concentration = 33.144 min.
Effective stream area after confluence = 585.700(Ac.)
End of computations, total study area = 585.70 (AC.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.711
Area averaged RZ index number = 69.7
~°~j°~
GSo
~~D
, ~51
~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational xydrology Study Date_ 02/06/03 File:798ACH.out
---------------- --------------------
' TR 29798 (NORTH HALF) DEVELOPED & TR 30264 (SOUTH HALF) UNDEVELOPED
WITHOUT OFF-SITES
~ 100 YEAR STORM
JN 32006
----------------------------------------------
********* HydrOlOgy Study COntY'O1 InfOrnt3tiOn *****+****
~~ English (in-lb) Units used in input data file
l ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
~ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,'1tnc,Rnch CaNOrco ) area used.
~ 10 year storm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
~ 100 year stornl 10 minute intensity = 3.480(In/Ar)
100 year storm 60 minute intensity = 1.300(In/Hr)
Storm event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
,~
~` ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
~i **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 1.773(In/Hr) for a 100.0 year storm
UNDEVELOPED (poor cover) subarea
~' Runoff Coefficient = 0.749
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.900
~ Decimal fraction soil group C= 0.100
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.80
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
TC = 34.14 min. Rain intensity = 1.77(In/Hr)
~ Total area = 585.70(Ac.) Total xunoff = 989.86(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 84.000 to Point/Station 85.000 ~~~
csz
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1059.000(Ft.)
Downstream point elevation = 1053.100(Ft.)
Channel length thru subarea = 590.000(Ft.)
Channel base width = 40.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000
Slope or ~Z~ of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.028
Maximum depth.of channel = 6.000(Ft.)
Flow(q) thru subarea = 991.271(CFS)
Depth of flow = 2.388(Ft.), Average velocity =
Channel flow top width = 59.107(Ft.)
Flow Velocity = 8.38(Ft/s)
Travel time = 1.17 min.
Time of concentration = 35.32 min.
991.271(CFS)
8.376(Ft/S)
Sub-Channel No. 1 Critical depth = 2.438(Ft.)
' ' ' Critical flow top width = 59.500(Ft
~ ~ ~ Critical flow velocity= 8.174(Ft/s)
' ' ' Critical flow area = 121.266(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.604
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 61.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.740(In/Hr) for a 100.0 year storni
Subarea runoff = 1.755(CFS) for 1.670(AC.)
Total runoff = 991.615(CFS) Total area = 587.370(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 85.000 to Point/Station 85.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in norntal stream number 1
Stream flow area = 587.370(Ac.)
Runoff from this stream = 991.615(CFS)
Time of concentration = 35.32 min.
Rainfall intensity = 1.740(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.000 to Point/Station 5.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 3.207(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.878
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil (AMC 2) = 56.00 ~,~0~
~53
Pervious area fraction = 0.100; Impervious fraction = 0.900
User specified values are as follows:
TC = 11.62 min. Rain intensity = 3.21(In/Hr)
Total area = 7.60(Ac.) Total runoff = 21.50(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.000 to Point/Station 5.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
Stream flow area = 7
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
i in noxmal stream number 2
.600(AC.)
21.500(CFS)
11.62 min.
3.207(In/Hr)
Stream Flow rate TC
No. (CFS) (min)
Rainfall Intensity
(In/Hr)
1 991.615 35.32 1.740
2 21.500 11.62 3.207
Largest stream flow has longer time of concentration
Qp = 991.615 + sum of
Qb Ia/Ib
21.500 * 0.543 = 11.666
Qp = 1003.281
Total of 2 streams to confluence:
Flow rates before confluence point:
991.615 21.500
Area of streams before confluence:
587.370 7.600
Results of confluence:
Total flow rate = 1003.281(CFS)
Time of concentration = 35.318 min.
Effective stream area after confluence = 594.970(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 85.000 to Point/Station 86.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1053.100(Ft.)
~ Downstream point elevation = -1042.300(Ft.)
Channel length thru subarea 1070.000(Ft.)
Channel base width = 40.000(Ft.)
Slope or 'Z~ of left channel bank = 4.000
~ Slope or ~Z~ of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel
Manning's 'N' = 0.028
, Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1005.852(CFS)
Depth of flow = 2.402(Ft.), Average velocity =
I Channel flow top width = 59.215(Ft.)
Flow Velocity = 8.44(Ft/s)
Travel time = 2.11 min.
Time of concentration = 37.43 min.
~
= 1005.852(CFS)
8.442(Ft/s)
~~3
~54
Sub-Channel No. 1 Critical depth = 2.469(Ft.)
' ' ' Critical flow top width = 59.750(Ft.)
' ' ' Critical flow velocity= 8.169(Ft/s)
' ' ' Critical flow area = 123.129(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.652
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.685(In/Hr) for a 100.0
Subarea runoff = 3.350(CFS) for 3.050(Ac.)
Total runoff = 1006.630(CFS) Total area = 598
= 0.000
year storm
020(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 86.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 598.020(AC.)
Runoff from this stream = 1006.630(CFS)
Time of concentration = 37.43 min.
Rainfall intensity = 1.685(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.020 to Point/Station 5.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.793(In/Hr) for a 100.0 year stoxm
APARTMENT subarea type
Runoff Coefficient = 0.860
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.200; Impervious fraction = 0.800
User specified values are as follows:
TC = 14.94 min. Rain intensity = 2.79(In/Hr)
Total area = 14.50(AC.) Total runoff = 33.81(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.020 to Point/Station 5.020
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 14.500(AC.)
Runoff from this stream = 33.810(CFS)
Time of concentration = 14.94 min.
Rainfall intensity = 2.793(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity ~6~
~ No.
(CFS) (min)
1 1006.630 37.43
2 33.810 14.94
Larg est stream flow has longer
Qp = 1006.630 + sum of
Qb Ia/Ib
33.810 * 0.603 =
Qp = 1027.032
(In/Hr)
1.685
2.793
time of concentration
20.402
G55
Total of 2 streams to confluence:
Flow rates before confluence point:
1006.630 33.810
Area of streams before confluence:
598.020 14.500
Results of confluence:
Total flow rate = 1027.032(CFS)
Time of concentration = 37.430 min.
Effective stream area after confluence = 612.520(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 87.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1042.300(Ft.)
Downstream point elevation = 1037.000(Ft.)
Channel length thru subarea = 530.000(Ft.)
Channel base width = 40.000(Ft.)
Slope or 'Z' of left channel bank = 4.000
Slope or 'Z' of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1028.332(CFS)
Depth of flow = 2.438(Ft.), Average velocity =
Channel flow top width = 59.507(Ft.)
Flow Velocity = 8.48(Ft/s)
Travel time = 1.04 min.
Time of concentration = 38.47 min.
~ Sub-Channel No
~ ~
~
,~
~
~
~
1 Critical depth =
' Critical flow
' Critical flow
' Critical flow
2.500(Ft.
top width =
velocity=
area = 125
1028.332(CFS)
8.476(Ft/S)
60.000(Ft
8.227(Ft/s)
.000(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.649
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.660(In/Hr) for a 100.0
Subarea runoff = 1.670(CFS) for 1.550(AC.)
Total runoff = 1028.702(CFS) Total area = 614
= 0.000
year storm
070(AC.) ~~
~ G SG
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 87.000 to Point/Station 87.000
- **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nonnal stream number 1
Stream flow area = 614.070(Ac.)
Runoff from this stream = 1028.702(CFS)
~ Time of concentration = 38.47 min.
Rainfall intensity = 1.660(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.030 to Point/Station 5.030
**** USER DEFINED FLOW INFORMATION AT A POINT ****
^
~
~
,
~.
Rainfall intensity = 2.842(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.801
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.500; impervious fraction = 0.500
User specified values are as follows:
TC = 14.47 min. Rain intensity = 2.84(In/Hr)
Total area = 5.50(Ac.) Total runoff = 12.62(CFS)
++++++++++++++++++++++++++++++.++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.030 to Point/Station 5.030
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 5.500(Ac.)
Runoff from this stream = 12.620(CFS)
Time of concentration = 14.47 min.
Rainfall intensity = 2.842(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
~ No. (CFS) (min) (In~Hr)
~, 1 1028.702 38.47
2 12.620 14.47 1.660
2.842
Largest stream flow has longer time of concentration
Qp = 1028.702 + sum of
Qb Ia/Ib
12.620 * 0.584 = 7.370
Qp = 1036.072
, Total of 2 streams to confluence:
Flow rates before confluence point:
1028.702 12.620
~ Area of streams before confluence:
614.070 5.500
Results of confluence: ~(p~E
~ Total flow rate = 1036.072(CFS)
~ 57
'~ Time of concentration = 38.473 min.
Effective stream area after confluence = 619.570(Ac.)
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 87.000 to Point/Station 88.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1037.000(Ft.)
~ Downstream point elevation = 1028.500(Ft.)
Channel length thru subarea = 860.000(Ft.)
Channel base width = 40.000(Ft.)
~ Slope or 'Z' of left channel bank = 4.000
_ Slope or ~Z~ of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel = 1038.137(CFS)
~ Manning's 'N' = 0.028 -
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 1038.137(CFS)
Depth of flow = 2.460(Ft.), Average velocity = 8.469(Ft/s)
~ Channel flow top width = 59.677(Ft.)
Flow Velocity = 8.47(Ft/s)
Travel time = 1.69 min.
, Time of concentration = 40.17 min.
Sub-Channel No. 1 Critical depth = 2.531(Ft.)
' ' ' Critical flow top width = 60.250(Ft.)
~ ' ' ' Critical flow velocity= 8.182(Ft/s)
• ' ' ' Critical flow area = 126.879(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (good cover) suba~ea
Runoff Coefficient = 0.645
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 67.50
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.621(In/Ar) for a 100.0 year storm
Subarea runoff = 2.581(CFS) for 2.470(AC.)
~ Total runoff = 1038.654(CFS) Total area = 622.040(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 622.040(Ac.)
~ Runoff from this stream = 1038.654(CFS)
Time of concentration = 40.17 min.
Rainfall intensity = 1.621(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.060 to Point/Station 5.060
~ **** USER DEFZNED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.626(In/Hr) for a 100.0 year storm ~~
~ SINGLE FAMILY (1/4 Acre Lot)
' ~7~
~ Runoff Coefficient = 0.795
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
, Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
r, Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 16.71 min. Rain intensity = 2.63(In/Hr)
~ Total area = 13.04(Ac.) Total runoff = 21.58(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.060 to Point/Station 5.060
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 13.040(AC.)
~ Runoff from this stream = 21.580(CFS)
Time of concentration = 16.71 min.
Rainfall intensity = 2.626(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
Rainfall Intensity
(In/Hr)
"' 1 1038.654 40.17 1.621
2 21.580 16.71 2.626
~ Largest stream flow has longer time of concentration
Qp = 1038.654 +.sum of
Qb Ia/Ib
21.580 * 0.617 = 13.322
~ Qp = 1051.976
~ Total of 2 streams to confluence:
Flow rates before confluence point:
1038.654 21.580
Area of streams before confluence:
~ 622.040 13.040
Results of confluence:
Total flow rate = 1051.976(CFS)
Time of concentration = 40.165 min.
1 Effective stream area after confluence = 635.080(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in no~al stream number 1
Stream flow area = 635.080(Ac.)
~ Runoff from this stream = 1051.976(CFS)
Time of concentration = 40.17 min.
Rainfall intensity = 1.621(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 8.050 to Point/Station 8.OSO,f~
~ **** USER DEFINED FLOW INFORMATZON AT A POINT ****
~
~
'
LJ
~
~
~I
L,
~
~
~
~
~
,
~s9
Rainfall intensity = 2.139(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.778
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 24.26 min. Rain intensity = 2.14(In/Hr)
Total area = 110.76(AC.) Total runoff = 200.35(CFS)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 8.050 to Point/Station 8.050
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 110.760(Ac.)
Runoff from this stream = 200.350(CFS)
Time of concentration = 24.26 min.
Rainfall intensity = 2.139(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 1051.976 40.17
2 200.350 24.26
Larg est stream flow has longer
Qp = 1051.976 + sum of
Qb Ia/Ib
200.350 * 0.758 =
Qp = 1203.807
1.621
2.139
time of concentration
151.832
Total of 2 streams to confluence:
Flow rates before confluence point:
1051.976 200.350
Area of streams before confluence:
635.080 110.760
Results of confluence:
Total flow rate = 1203.807(CFS)
Time of concentration = 40.165 min.
Effective stream area after confluence =
745.840(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 89.000
**** IMPROVED CHANNEL TRAVEL TIME ****
~
~
~
Upstream point elevation = 1028.100(Ft.)
Downstream point elevation = 1020.600(Ft.)
Channel length thru subarea = 920.000(Ft.)
Channel base width = 44.000(Ft.)
Slope or 'Z' of left channel bank = 4.000
Slope or ~Z~ of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel =
1205.986(CFS) `~~
GGo
~
Manning's 'N' = 0.028
Maximum depth of channel =
~ Flow(q) thru subarea = 1205
. Depth of flow = 2.693(Ft.),
Channel flow top width = 65
Flow Velocity
= 8.17(Ft/s)
~ -
Travel time 1.88 min.
Time of concentration = 42.
~ Sub-Channel No
~ ~
~
6.000(Ft.)
986(CFS)
Average velocity =
547(Ft.)
04 min.
1 Critical depth =
' Critical flow
'. Critical flow
~ Critical flow
2.625(Ft
top width =
velocity=
area = 14
8.175(Ft/s)
65.000(Ft.)
8.430(Ft/s)
.063(Sq.Ft)
Adding area flow to channel
~ UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.640
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
~ Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.581(In/Hr) for a 100.0
Subarea runoff = 2.732(CFS) for 2.700(AC.)
1 Total runoff = 1206.539(CFS) Total area = 748
= 0.000
year storm
540(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
~
'
~
~
~
~
L
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 748.540(AC.)
Runoff from this stream = 1206.539(CFS)
Time of concentration = 42.04 min.
Rainfall intensity = 1.581(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 9.020 to Point/Station 9.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.801(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 14.86 min. Rain intensity = 2.80(In/Hr)
Total area = 31.98(AC.) Total runoff = 51.17(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 9.020 to Point/Station 9.020
**** CONFLUENCE OF MINOR STREAMS **** ~~~
d6~
Along Main Stream number:
Stream flow area = 31
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
1 in normal stream number 2
.980(Ac.)
51.170(CFS)
14.86 min.
2.801(In/Hr)
Stream Flow rate TC
No. (CFS) (min)
1 1 206.539 42.04
2 51.170 14.86
Largest stream flow has longer
Qp = 1206.539 + sum of
Qb Ia/Ib
51.170 * 0.564 =
Qp = 1235.420
Rainfall Intensity
(In/Hr)
1.581
2.801
time of concentration
28.881
Total of 2 streams to confluence:
Flow rates before confluence point:
1206.539 51.170
Area of streams before confluence:
748.540 31.980
Results of confluence:
Total flow rate = 1235.420(CFS)
Time of concentration = 42.041 min.
Effective stream area after confluence = 780.520(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 1
Stream flow area = 780.520(Ac.)
Runoff from this stream = 1235.420(CFS)
~ Time of concentration = 42.04 min.
Rainfall intensity = 1.581(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 1.946(In/Hr) for a 100.0 year stonn
COMMERCIAL subarea typ2
Runoff Coefficient = 0.869
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
~ User specified values are as follows:
TC = 28.82 min. Rain intensity = 1.95(In/Hr)
Total area = 7.22(Ac.) Total runoff = 14.56(CFS)
' \`~~
~~ Z
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 1206.000 to Point/Station 1206.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
~ Stream flow area = 7
Runoff from this stream =
Time of concentration =
~ Rainfall intensity =
Summary of stream data:
1 in normal stream number 2
.220(AC.)
14.560(CFS)
28.82 min.
1.946(In/Hr)
L Stream Flow rate TC
No. (CFS) (min)
, 1
2
- La
~ 4P
4A
1235.420 42.04
14.560 28.82
rgest stream flow has longer
= 1235.420 + sum of
Qb Ia/Ib
14.560 * 0.812 =
= 1247.250
Rainfall Intensity
(In/Hr)
1.581
1.946
time of concentration
11.830
~ Total of 2 streams to confluence:
Flow rates before confluence point:
1235.420 14.560
~ Area of streams before confluence:
780.520 7.220
Results of confluence:
~ Total flow rate = 1247.250(CFS)
Time of concentration = 42.041 min.
Effective stream area after confluence =
~
787.740(AC.)
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
~ Stream flow area = 787.740(Ac.)
Runoff from this stream = 1247.250(CFS)
Time of concentration = 42.04 min.
~ Rainfall intensity = 1.581(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 11.050 to Point/Station 11.050
**** USER DfiFINED FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 2.410(In/Hr) for a 100.0 year storm
CONDOMINIUM subarea type
Runoff Coefficient = 0.805
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 56.00
Pervious area fraction = 0.350; Impervious fraction = 0.650
User specified values are as follows:
, TC = 19.53 min. Rain intensity = 2.41(In/Hr) \1~
~ " GG3
Total area = 52.75(AC.) Total runoff = 103.62(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 11.050 to Point/Station 11.050
~ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
~ Stream flow area = 52.750(Ac.)
Runoff from this stream = 103.620(CFS)
Time of concentration = 19.53 min.
I Rainfall intensity = 2.410(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
~ No. (CFS) (min) (In/Hr)
, 1 1247.250 42.04 1.581
2 103.620 19.53 2.410
Largest stream flow has longer time of concentration
Qp = 1247.250 + sum of
~ Qb Ia/Ib
103.620 * 0.656 = 67.969
Qp = 1315.219
~ Total of 2 streams to confluence:
= Flow rates before confluence point:
~ 1247.250 103.620
Area of streams before confluence:
787.740 52.750
Results of confluence:
~ Total flow rate = 1315.219(CFS)
Time of concentration = 42.041 min.
Effective stream area after confluence = 840.490(Ac.)
~ End of computations, total study area = 840.49 (AC.)
The following figures may
be used for a unit hydrograph study of the same area.
~ Area averaged pervious area fraction(Ap) = 0.834
Area averaged RI index number = 73.4
:~
C_J
~
' ~~~
, ~~~
~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264BEX.out
~ ------------------------------------------------------------------------
TR 30264 EXISTING CONDITION WITH OFF-SITES DETAINED
100 YEAR STORM
~ JN 32006
------------------
********* HydYOlOJy StUdy COntr01 IrifOr~CldtiOri **********
, English (in-lb) Units used in input data file
, -------------------------------------------------
Lohr s~ Associates, Inc., Temecula, CA - S/N 773
Rational Method Hydrology Program based on
' Riverside County Flood Control & Wa ter Conservation District
1978 hydrology manual
, Storm event (year) = 100.00 Antece dent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,'I~nc,Rnch CaNorco ] area used.
' 10 year storm 10 minute intensity = 2.360(In/Hr)
10 year stonn 60 minute intensity = 0.880(In/Hr)
, 100 year storm 10 minute intensity
100 year stonn 60 minute intensity = 3.480(In/Hr)
= 1.300(In/Hr)
Stornl event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve = 0.5500
'
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
~ **** INITIAL AREA EVALUATION ****
Initial area flow distance = 1000.000(Ft.)
~ Top (of initial area) elevation = 1148.000(Ft.)
Bottom (of initial area) elevation = 1130.300(Ft.)
Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1.77
~ TC = k(0.530)*[(length"'3)/(elevation change)]"0.2
Initial area time of concentration = 18.823 min.
Rainfall intensity = 2.460(In/Hr) for a 100.0
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pervious area fraction = 1.000; Impervious fraction
year storm
~~~
= 0.000
, 7n2
initial subarea runoff = 19.200(CFS)
' Total initial stream area = 10.000(Ac.)
Pezvious area fraction = 1.000
~ +++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** NAT[JRAL CHANNSL TIME + SUBARSA PIAW ADDITION ****
' Top of natural channel elevation = 1130.300(Ft.)
Snd of natural channel elevation = 1115.000(Ft.)
~ Length of natural channel = 980.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 37.440(CFS)
Natural valley channel type used
~ L.A. County flood control diatrict foxmula for channel velocity:
Velocity(ft/s) _ (7 + B(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channei flow = 4.45(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalla (Plate D-6.2)
Nozinal channel slope = 0.0156
~ Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 min. TC = 22.49 min.
~ Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
, Runoff Coefficient = 0.770
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fzaction soil group C= 0.000
, Decimal fraction soil group D= 0.000
RZ index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Rainfall intensity = 2.230(In/Hr) for a 100.0 year stozm
Subarea runoff = 32.632(CFS) for 19.000(Ac.)
Total runoff = 51.832(CFS) Total area = 29.000(AC.)
,
~
~
'
,
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++
Proceas from Point/Station 102.000 to Point/Station 103.000
**** NATURAL CHANNSL TIMS + SUBARSA FLOW ADDITION **+•
Top of natural channel elevation = 1115.000(Ft.)
Snd of natural channel elevation = 1100.500(Ft.)
Length of natural channel = 1020.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 67.203(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 5.03(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0142
Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min.
~~s
~
~
,
~
~
~
Adding area flow to channel
UNDBVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soiltAMC 2) = 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year storm
Subarea runoff = 27.039(CFS) for 17.200(Ac.)
Total runoff = 78.870(CFS) Total area = 46.200(AC.)
70 3
, +++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
**** NATURAL CHANNSL TIMH + SUBAREA FLOW ADDITION ****
~
~
Top of natural channel elevation = 1100.500(Ft.)
End of natural channel elevation = 1095.800{Ft.)
Length of natural channel = 420.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 79.297(CFS)
Natural valley channel type used
' L.A. County flood control dietrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.69(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
, Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
,
~
J
'
~
'
,
,
Adding area flow to
UNDfiVSLOPSD (poor cov
Runoff Coefficient = 0
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for 8oi1(AMC
Pervious area fractio
Rainfall intensity =
Subarea runoff =
Total runoff = 79.
channel
er) subarea
.758
group A = 0.000
group B = 1.000
group C = 0.000
group D = 0.000
2) = 78.00
n = 1.000; Impervious fraction
2.002(In/Hr) for a 100.0
0.758(CFS) for 0.500(AC.)
629(CFS) Total area = 46
= 0.000
year stozm
700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
•*** CONFLUBNCS OF MINOR STRSAMS ****
Along Main Stream number: 1 in normal stream number i
Stream flow area = 46.700(Ac.)
Runoff from this stream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(In/Hr) ~~(p
~
,
'
~
,
~
~
L
'
,
I
~
'
,
~
'
'
,
'
1
,
70 ~{
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 104.000 to Point/Station 105.000
~t** INITIAL ARBA BVALUATION ****
Initial area flow distance = 785.000(Ft.)
Top (of initial area) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.000(Ft.)
Difference in elevation = 14.000(Ft.)
Slope = 0.01783 s(percent)= 1.78
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.060 min.
Rainfall intensity = 2.596(In/Hr) for a 100.0 year storm
UNDEVSIAPBD (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Initial subarea zunoff = 20.410(CFS)
Total initial stream area = 10.000(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++
Process from Point/Station 105.000 to Point/Station 106.000
**** NATURAL CHANNfiL TIMB + SUBARBA FIAW ADDITION +***
Top of natural channel elevation = 1133.000(Ft.)
End of natural channel elevation = 1116.000(Ft.]
Length of natural channel = 1175.000(Ft.)
&etimated mean flow rate at midpoint of channel = 32.655(CFS)
Natural valley channel type used
L.A. County flood control dietrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.12(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalis (Plate D-6.2)
Normal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81
Adding area flow to channel
UNDEVELOPED (poor cover) aubarea
Runoff Coefficient = 0.772
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
Rainfall intensity = 2.268(In/Hr) for
Subarea runoff = 21.013(CFS) for 12
Total runoff = 41.423(CFS) Total area
min.
fraction = 0.000
a 100.0 year stozm
.000(AC.)
= 22 . 000 (Ac. ) `,1~
~ 70 5
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 107.000
**** NATURAL CHANNSL TIMfi + SUBARSA FLOF1 ADDITION ****
, Top of natural channel elevation = 1116.000(Ft.)
End of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
~ Sstimated mean flow rate at midpoint of channel = 50.366(CFS)
Natural valley channel type used
' L.A. County flood control diatrict foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngliah Units>".352)(slope"0.5)
Velocity using mean channel flow = 4.91(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0160
, Corrected/adjusted channel slope = 0.0160
Travel time = 4.28 min. TC = 26.08 min.
, Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.761
' Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.056(in/Hr) for a 100.0 year stoxm
, Subarea runoff = 14.857(CFS) for 9.500(Ac.)
Total runoff = 56.2'79(CFS) Total area = 31.500(Ac.)
, +++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
' **** CONFLUBNCS OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 31.500(AC.)
' Runoff from this stream = 56.279(CFS)
Time of concentration = 26.08 min.
Rainfall intensity = 2.056(In/Hr)
, Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Ar)
,
1 79.629 27.36 2.002
, 2 56.279 26.08 2.056
Largest stream flow has longer time of concentration
Qp = 79.629 + aum of
~ Qb Ia/Ib
56.279 * 0.974 = 54.815
Qp = 134.443
, Total of 2 streams to confluence: `~&
, 7~6
Flow rates before confluence point:
' 79.629 56.279
Area of streams before confluence:
46.700 31.500
Results of confluence:
' Total flow rate = 134.443(CFS)
Time of concentration = 27.365 min.
Sffective stream area after confluence = 78.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 107.000 to Point/Station 110.000
**** NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1095.800(Ft.)
' 8nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 910.000(Ft.)
8stimated mean flow rate at midpoint of channel = 193.899(CFSI
, Natural valley channel type uaed
L.A. County flood control district formula for channel velocity:
velocity(ft/s) _ (7 + 8(qtBnglish Units)".352)(slope"0.5)
' Velocity ueing mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely zugged channels with
, dropa and waterfalls (Plate D-6.2)
Normal channel slope = 0.0091
Corrected/adjusted channel slope = 0.0091
, Travel time = 3.00 min. TC = 30.36 min.
Adding area flow to channel
, UNDfiVFiLOPBD (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(AC.)
~ Total runoff = 150.057(CFS) Total area = 69.200(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUSNCB OF MINOR STREAMS ****
' Along Main Stream number: 1 in nozmal stream number 1
Stream flow area = 89.200(Ac.)
Runoff from this stream = 150.057(CFS)
' Time of concentration = 30.36 min.
Rainfall intensity = 1.891(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++t+++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREP, BVALUATION **** `'~~
,
1 7~7
Initial area flow distance = 710.000(Ft.)
, Top (of initial area) elevation = 1112.000(Ft.)
Bottom (of initial area) elevation = 1100.000(Ft.)
Difference in elevation = 12.000(Ft.)
Slope = 0.01690 s(percent)= 1.69
' TC = k(0.530)*[(length"3)/(elevation change))"0.2
initial area time of concentration = 16.565 min.
Rainfall intensity = 2.639(In/Hr) for a 100.0 year storm
~ UNDBVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 17.875(CFS)
Total initial stream area = 8.600(AC.)
' Pervious area fraction = 1.000
++++++++++++t+++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 109.000 to Point/Station 110.000
**** NATURAL CHANNBL TIMB + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1100.000(Ft.)
~ Snd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
8stimated mean flow rate at midpoint of channel = 25.046(CFS)
,
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
, Velocity using mean channel flow = 3.51(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0121
' Corrected/adjusted channel alope = 0.0121
Travel time = 4.89 min. TC = 21.46 min.
, Adding area flow to channel
UNDEVELOPBD (poor cover) subarea
Runoff Coefficient = 0.773
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.289(In/Hr1 for a 100.0 year atoxm
' Subarea runoff = 12.206(CFS) for 6.900(Ac.)
Total runoff = 30.081(CFS) Total area = 15.500(Ac.)
~ +++++++++++++++++++++++++++~+++++++++++++++++++++++++~+++++~+++++~++++
Process from Point/Station 110.000 to Point/Station 110.000
* * • ~ CONFLiTSATCB OF MINOR STRSAMS * * * * ~~O
,
,
'
'
,
'
'
'
'
,
,
'
'
'
~
'
'
~
'
,
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 15.500(AC.)
Runoff from this etream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall intensity = 2.289(In/Hr)
Su~nary of stream data:
Stream Flom rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 150.057 30.36 1.891
2 30.081 21.46 2.289
Largest stream flow has longer time of concentration
Qp = 150.057 + sum of
Qb ia/ib
30.081 * 0.826 = 24.853
Qp = 174.910
Total of 2 streams to confluence:
Flow rates before confluence point:
150.057 30.081
Area of streame before confluence:
89.200 15.500
Results of confluenCe:
Total flow rate = 174.910(CFS)
Time of concentration = 30.362 min.
$ffective stream area after confluence = 104.700(AC.)
jo 8
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 110.000 to Point/Station 123.000
•*'* NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1087.500(Pt.)
Snd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 675.000(Ft.)
Estimated mean flow rate at midpoint of channel = 189.778(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unite)".352)(slope"0.5)
velocity using mean channel flow = 4.44(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalis (Plate D-6.2)
Normal channel slope = 0.0059
Corrected/adjusted channel slope = 0.0059
Travel time = 2.53 min. TC = 32.89
Adding area flow to channel
UNDBVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
min.
fraction =
0.000
~gj\
,
,
'
'
~
'
Rainfall intensity = 1.809(In/Hr) for a 100.0 year stozm
Subarea runoff = 23.997(CFS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(AC.)
7aq
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUBNCB OF MAIN STRBAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 122.500(Ac.)
Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intensity = 1.809(in/Hr)
Program is now starting with Main Stream No. 2
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 111.000 to Point/Station 112.000
•**• INITIAL ARSA SVALUATION ****
' Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1143.000(Ft.)
Bottom (of initial area) elevation = 1135.300(Ft.)
, Difference in elevation = 7.700(Ft.)
Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
~ Initial area time of concentration = 14.668 min.
Rainfall intensity = 2.821(In/Hr) for a 100.0 year stozm
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.815
1 Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Initial subarea runoff = 23.004(CFS)
Total initial etream area = 10.000(Ac.)
Pervious area fraction = 1.000
,
'
1
,
'
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++
Process from Point/Station 112.000 to Point/Station 113.000
**** NAT~TRAL CHANNBL TIME + SUBARBA FLOW ADDITION **~*
Top of natural channel elevation = 1135.300(Ft.)
Snd of natural channel elevation = 1122.800(Ft.)
Length of natural channel = 810.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 44.858(CFS)
Natural valley channel type used
L.A. County flood control diatrict foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Unita)".352)(slope"0.5)
Velocity using mean channel flow = 4.66(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0154
~~~
1
,
'
'
'
,
'
'
,
,
,
Corrected/adjusted channel slope = 0.0154
Travel time = 2.90 mi.n. TC = 17.56 min.
Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RZ index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.555(In/Sr) for a 100.0 year storm
Subarea runoff = 39.199(CFS) for 19.000(AC.)
Total runoff = 62.203(CFS) Total area = 29.000(Ac.)
7~ ~
+++++++++++++++++++++++++++++++++~+~++++++++++++++++++++++~+++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATtJRAL CHANNSL TIMS + SUBARfiA FLOW ADDITION ***•
Top of natural channel elevation = 1122.800(Ft.)
Snd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 82.560(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.75(Ft/s)
Correction to map elope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0112
Corrected/adjusted channel slope = 0.0112
Travel time = 3.68 min. TC = 21.25 min.
, Adding area flow to channel
UNDEVE3LOPSD (poor cover) subarea
Runoff Coefficient = 0.774
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pexvious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.301(In/Hr) for a 100.0 year storm
, Subarea runoff = 33.820(CFS) for 19.000(Ac.)
Total runoff = 96.023(CFS) Total area = 48.000(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 114.000 to Point/Station 114.000
~ **** CONFLUBNCB OF MINOR STRBAMS ****
Along Main Stream number: 2 in nozmal stream number 1
Stream flow area = 48.000(Ac.) ~`1j
' Runoff from this stream = 96.023(CFS)
,
'
'
'
,
'
'
Time of concentration = 21.25 min.
Rainfall intensity = 2.301(In/Hr)
7~1
+++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
***+ US13R DSFINBD FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.029(In/Hr) for a 100.0 year storm
UNDBVELOPBD (poor cover) subarea
Runoff Coefficient = 0.813
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.000
Decimal fraction soil group C= 1.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 86.00
Pervious area fraction = 1.000; impervious fraction = 0.000
User specified values are as follows:
TC = 26.70 min. Rain intensity = 2.03(In/Hr)
Total area = 217.00(Ac.) Total runoff = 324.00(CFS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 116.000
**** IMPROVSD CHANNSL TRAVSL TIME ****
' Upstream point elevation = 1133.000(Ft.)
Downstream point elevation = 1106.500(Ft.)
Channel length thru subarea = 1960.000(Ft.)
, Channel base width = 10.000(Ft.)
Slope or '2~ of left channel bank = 4.000
Slope or ~Z~ of right channel bank = 3.000
~ Bstimated mean flow rate at midpoint of channel = 339.080(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 7.000(Ft.)
' Flow(q) thru subarea = 339.080(CFS)
Depth of flow = 2.366(Ft.), Average velocity = '1.840(Ft/s)
Channel flow top width = 26.562(Ft.)
Flow Velocity = 7.84(Ft/s)
' Travel time = 4.17 min.
Time of concentration = 30.87 min.
' Sub-Channel No. 1 Critical depth = 2.469(Ft.)
' ' ' Critical flow top width = 27.281(Ft.)
' ' ' Critical flow velocity= 7.368(Ft/s)
' ' ' Critical flow area = 46.019(Sq.Ft)
, Adding area flow to channel
UNDBVELOPBD (poor cover) subarea
, Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.450
~ Decimal fraction soil group C= 0.550
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 82.40
Pervious area fraction = 1.000; Impervious fraction = 0.000
' Rainfall intensity = 1.874(In/Hr) for a 100.0 year storm
Subarea runoff = 29.570(CFS) for 20.200(AC.)
Total runoff = 353.570(CFS) Total area = 237.200(AC.) `$~Q
,
c
, ~' n
' +++4?+t+tttttttttttttttttttttttt+t+ttt+tt+++t++t+ttt+ttt+tt++t~F++++ttt
Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUSNCS OF MINOR STRBAMS ****
' Along Main Stream number: 2 in normal stream number 2
Stream flow area = 237.200(Ac.)
Runoff from this stream = 353.570(CFS)
, Time of concentration = 30.87 min.
Rainfall intensity = 1.874(In/Hr)
Su~nary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 96.023 21.25 2.301
2 353.570 30.87 1.874
, Largeet stream flow has longer time of concentration
Qp = 353.570 + sum of
Qb ia/Ib
96.023 * 0.814 = 78.192
' Qp = 431.762
Total of 2 streams to confluence:
' Flow rates before confluence point:
96.023 353.570
Area of atreams before confluence:
' 48.000 237.200
Results of confluence:
Total flow rate = 431.762(CFS)
Time of concentration = 30.867 min.
' Sffective etream area after confluence = 285.200(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 123.000
**~* IMPROVSD CHANNSL TRAi~SL TIMF ****
, Upetream point elevation = 1106.500(Ft.)
Downstream point elevation = 1083.500(Ft.)
Channel length thru aubarea = 1970.000(Ft.)
, Channel base width = 25.000(Ft.)
Slope or ~Z~ of left channel bank = 15.000
Slope or 'Z' of right channel bank = 2.000
, 8stimated mean flow rate at midpoint of channel = 439.634(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 2.500(Ft.)
Flow(q) thru subarea = 439.634(CFS)
, Depth of flow = 1.756(Ft.), Average velocity = 6.268(Ft/s)
Channel flow top width = 54.859(Ft.)
Flow Velocity = 6.2'l(Ft/s)
' Travel time = 5.24 min.
Time of concentration = 36.10 min.
~ Sub-Channel No. 1 Critical depth = 1.734(Ft.)
' ' ' Critical flow top width = 54.484(Ft.)
' ' ' Critical flow velocity= 6.378(Ft/s) ~
' ' ' Critical flow area = 68.928(Sq.Ft) `~
,
, 7r~
Adding area flow to channel
, UNDEVSLOP~ (poor cover) subarea
Runoff Coefficient = 0.738
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
' Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
, Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 1.719(In/Hr) for a 100.0 year storm
Subarea runoff = 13.201(CFS) for 10.400(AC.)
, Total runoff = 444.963(CFS) Total area = 295.600(Ac.)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++t++
, Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUSNCB OF MAIN STREAMS +**•
, The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 295.600(Ac.)
Runoff from this stream = 444.963(CFS)
' Time of concentration = 36.10 min.
Rainfall intensity = 1.719(In/Hr)
Program is now starting with Main Stream No. 3
'
+++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 117.000 to Point/Station 117.000
**** USSR DSFINBD FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.617(In/Hr) for a 100.0 year etorm
' SINGLB FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.771
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 16.82 min. Rain intensity = 2.62(In/Hr)
' Total area = 62.70(Ac.) Total runoff = 129.00(CFS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNBL TIMB + SUBARRA FLOW ADDITION ****
, Top of natural channel elevation = 1118.000(Ft.)
Bnd of natural channel elevation = 1101.000(Ft.)
Length of natural channel = 790.000(Ft.)
' 8stimated mean flow rate at midpoint of channel = 138.258(CFS)
Natural valley channel type used
, L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Unite)".352)(slope"0.5)
velocity using mean channel flow = 7.68(Ft/s) ~~6
, Correction to map slope uaed on extremely rugged channels with
~
drops and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0215
Corrected/adjusted channel slope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
I Runoff Coefficient = 0.782
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~ Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction
' Rainfall intensity = 2.480(In/Hr) for a 100.0
Subarea runoff = 17.447(CFS) for 9.000(AC.)
Total runoff = 146.447(CFS) Total area = 71
- 0.000
year stonn
700(AC.)
7!4
- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
,~ Process from Point/Station 118.000 to Point/Station 121.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
~ End of natural channel elevation = 1090.500(Ft.)
Length of natural channel 980.000(Ft.)
Estimated mean flow rate at midpoint of channel = 156.251(CFS)
~~ Natural valley channel type used
L.A. County flood control disGrict fos~nula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"'0.5)
~ Velocity using mean channel flow = 5.63(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalls (Plate D-6.2)
Nornial channel slope = 0.0107
Corrected/adjusted channel slope = 0.0107
~ Travel time = 2.90 min. TC = 21.44 min.
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.290(In/Hr) for a 100.0 year storm
Subarea runoff = 16.992(CFS) for 9.600(AC.)
Total runoff = 163.439(CFS) Total area = 81.300(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/StatiOn 121.000
**** CONFLUENCE OF MINOR STREAMS ****
, Along Main Stream number: 3 in normal stream number 1
~$~
I ''S
Stream flow area = 81.300(Ac.)
~ Runoff from this stream = 163.439(CFS)
Time of concentration = 21.44 min.
Rainfall intensity = 2.290(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
~ **** INITIAL AREA EVALUATION **~*
Initial area flow distance = 920.000(Ft.)
1 Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1094.000(Ft.)
Difference in elevation = 66.000(Ft.)
Slope = 0.07174 s(percent)= 7.17
' TC = k(0.480)*((length"3)/(elevation change)]"0.2
Initial area time of concentration = 12.462 min.
Rainfall intensity = 3.086(In/Hr) for a 100.0 year storm
~ SINGLE FAMILY (1 Acre Lot)
Runoff Coefficient = 0.718
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
' Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
~ Pervious area fraction = 0.800; Impervious fraction = 0.200
Initial subarea runoff = 7.085(CFS)
Total initial stream area = 3.200(Ac.)
1 Pervious area fraction = 0.800
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CH11b7NEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1094.000(Ft.)
~ End of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 9.520(CFS)
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
T Velocity(ft/s) _ (7 + 8(q(English Units)~.352)(slope"'0.5)
Velocity using mean channel flow = 1.95(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
Nonnal channel slope = 0.0063
Corrected/adjusted channel slope = 0.0063
~ Travel time = 4.78 min. TC = 17.25 min.
Adding area flow to channel
~ UNDFsVfiLOPED (poor cover) subarea
Runoff Coefficient = 0.786
~ Decimal fraction soil
Decimal fraction soil group A= 0.000
group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000 ~~
~ RI index for soil(AMC 2) = 78.00
~
~
~
~
'
~
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(In/Hr) for a 100.0 year storni
Subarea runoff = 4.460(CFS) for 2.200(Ac.)
Total runoff = 11.545(CFS) Total area = 5.400(Ac.)
~~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUENCE OF MINOR STREAMS ~+~*
Along Main Stream number:
Stream flow area = 5
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
Rainfall Intensity
(In/Hr)
3 in norntal stream number 2
.400(AC.)
11.545(CFS)
17.25 min.
2.581(In/Hr)
Stream Flow rate TC
~ No. (CFS) (min)
O
~
'
,
~
~
IJ
1 163.439 21.44 2.290
2 11.545 17.25 2.581
Largest stream flow has longer time of concentration
Qp = 163.439 + sum of
Qb Ia/Ib
11.545 * 0.887 = 10.243
Qp = 173.682
Total of 2 streams to confluence:
Flow rates before confluence point:
163.439 11.545
Area of streams before confluence:
81.300 5.400
Results of confluence:
Total flow rate = 173.682(CFS)
Time of concentration = 21.438 min.
Effective stream area after confluence = 86.700(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1090.500(Ft.)
End of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.)
Estimated mean flow rate at midpoint of channel = 192.512(CFS)
' Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 3.93(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
' Noxmal channel slope = 0.0046
Corrected/adjusted channel slope = 0.0046
Travel time = 3.14 min. TC = 24.58 min. `O
('~
' O
, 7~7
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.765
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Rainfall intensity = 2.124(In/Hr) for a 100.0 year storm
~ Subarea runoff = 30.531(CFS) for 18.800(AC.)
Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
1 Top of natural channel elevation = 1087.100(Ft.)
End of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
~ Estimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type used
~ L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.08(Ft/s)
,~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D--6.2)
Normal channel slope = 0.0026
, Corrected/adjusted channel slope = 0.0026
Travel time = 7.36 min. TC = 31.94 min.
'~ Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.747
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) 78. 00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.839(
Subarea runoff = 12.915(CFS) In/Ar) for a 100.0 year stonn
for 9.400(AC.)
Total runoff = 217.127(CFS) Total area = 114.900(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
~ **** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
~ In Main Stream number: 3
Stream flow area = 114.900(AC.)
Runoff from this stream = 217.127(CFS)
Time of concentration = 31.94 min. ~p~0
, Rainfall intensity = 1.839(In/Hr)
~
Summary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~
1 198.907 32.89 1.809
2 444.963 36.10 1.719
3 217.127 31.94 1.839
~ Largest stream flow has longer time of concentration
Qp = 444.963 + sum of
Qb Ia/Ib
~ 198.907 * 0.950 = 188.975
Qb Ia/Ib
217.127 * 0.935 = 202.974
~ Qp = 836.913
Total of 3 main streams to confluence:
Flow rates before confluence point:
~ 198.907 444.963 217.127
Area of streams before confluence:
122.500 295.600 114.900
~
Results of confluence:
Total flow rate = 836.913(CFS)
~ Time of concentration = 36.105 min.
Effective stream area after confluence = 533.000(Ac.)
718
~ ++++++++++++++++++++++++++++++.++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 129.000
~ **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1083.500(Ft.)
,~ Downstream point elevation = -1061.500(Ft.)
Channel length thru subarea 910.000(Ft.)
- Channel base width = 4.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
~ Slope or 'Z' of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N~ = 0.030
~ Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 839.661(CFS)
Depth of flow = 4.564(Ft.), Average velocity =
~ Channel flow top width = 22.256(Ft.)
Flow Velocity = 14.01(Ft/s)
Travel time = 1.08 min.
Time of concentration = 37.19 min.
839.661(CFS)
14.014(Ft/5)
1 Sub-Channel No. 1 Critical depth = 5.500(Ft.)
' ' ' Critical flow top width = 26.000(Ft.)
~, ' ' ' Critical flow velocity= 10.178(Ft/s)
' ' ' Critical flow area = 82.500(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.736
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 1.000
~q'~
r
~
~
'
'
i
'
LJ
~
~'
~
~
u
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.691(In/Hr) for a 100.0 year storm
Subarea runoff = 4.358(CFS) for 3.500(Ac.)
Total runoff = 841.271(CFS) Total area = 536.500(AC.)
~~9
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 536.500(AC.)
Runoff from this stream = 841.271(CFS)
Time of concentration = 37.19 min.
Rainfall intensity = 1.691(In/Hr)
Program is now starting with Main Stream No. 2
Process from Point/Station 119.000 to Point/Station 124.000
**** INITIAL AREA EVALUATION ****
initial area flow distance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Bottom (of initial area) elevation = 1088.000(Ft.)
Difference in elevation = 72.000(Ft.)
Slope = 0.08372 s(percent)= 8.37
TC = k(0.530)*[(length"3)/(elevation change))"0.2
Initial area time of concentration = 12.987 min.
Rainfall intensity = 3.016(In/Hr) for a 100.0 year stonn
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.800
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; impervious fraction = 0.000
Initial subarea runoff = 7.724(CFS)
Total initial stream area = 3.200(Ac.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1088.000(Ft.)
Downstream point elevation = 1079.000(Ft.)
~ Channel length thru subarea = 390.000(Ft.)
Channel base width = 17.000(Ft.)
~ Slope or 'Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 5.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
' Maximum depth of channel = 1.000(Ft.)
8.690(CFS) 2
~a
, 7 zo
Flow(q) thru subarea = 8.690(CFS)
~ Depth of flow = 0.198(Ft.), Average velocity = 2.484(Ft/s)
Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
1 Time of concentration = 15.60 min.
Sub-Channel No. 1 Critical depth = 0.199(Ft.)
~ ' ' ' Critical flow top width = 18.395(Ft.)
' ' ' Critical flow velocity= 2.465(Ft/s)
~ ' ' Critical flow area = 3.526(Sq.Ft)
1 Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.791
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.727(In/Hr) for a 100.0 year storm
~ Subarea runoff = 1.725(CFS) for 0.800(AC.)
Total runoff = 9.450(CFS) Total area = 4.000(Ac.)
- Process from Point/Station 125.000 to Point/Station 125.000
~ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 4.000(AC.)
' Runoff from this stream = 9.450(CFS)
Time of concentration = 15.60 min.
Rainfall intensity = 2.727(In/Hr)
1 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 125.'000 to Point/Station 125.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Hr) for a 100.0 year storm
~ SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.400
Decimal fraction soil group C= 0.600
- Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 63.80
~ Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 25.00 min. Rain intensity = 2.10(In/Hr)
~ Total area = 118.00(Ac.) Total runoff = 293.20(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station
**** CONFLUENCE OF MINOR STREAMS ****
++++++++
125.000
~q,3
' Along Main Stream number: 2 in normal stream number 2
, Stream flow area = 118.000(AC.)
~ Runoff from this stream = 293.200(CFS)
Time of concentration = 25.00 min.
Rainfall intensity = 2.104(In/Hr)
Summary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. ~(CFS) (min) (Zn/Hr)
~ 1 9.450 15.60 2.727
1 2 293.200 25.00 2.104
Largest stream flow has longer time of concentration
Qp = 293.200 + sum of
Qb Ia/Ib
~ 9.450 * 0.772 = 7.292
Qp = 300.492
i Total of 2 streams to confluence:
Flow rates before confluence point:
9.450 293.200
Area of streams before confluence:
~ 4.000 118.000
Results of confluence:
Total flow rate = 300.492(CFS)
' Time of concentration = 25.000 min.
Effective stream area after confluence = 122.000(Ac.)
721
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 126.000
**** IMPROVED CHANNEL TRAVEL TIME ****
II
u
~
,
~
~
~
~
~
'
Upstream point elevation = 1079.000(Ft.)
Downstream point elevation = 1073.700(Ft.)
Channel length thru subarea = 870.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 319.211(CFS)
Depth of flow = 3.059(Ft.), Average velocity =
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Ft/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
Sub-Channel No. 1 Critical depth = 2.656(Ft.
~ ' ' Critical flow top width =
~ ' ' Critical flow velocity=
~ ' ' Critical flow area = 45
Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.757
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
319.211(CFS)
5.561(Ft/s)
28.906(Ft.)
7.089(Ft/s)
.032(Sq.Ft)
~~~
, iM
Decimal fraction soil group D= 0.000
, RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.992(In/Hr) for a 100.0 year storm
Subarea runoff = 22.927(CFS) for 15.200(AC.)
, Total runoff = 323.419(CFS) Total area = 137.200(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 126.000 to Point/Station 127.000
**** IMPROVED CHANNEL TRAVEL TIME ****
' Upstream point elevation = 1073.700(Ft.)
Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
, Channel base width = 5.000(Ft.)
Slope or 'Z' of left channel bank = 3.000
Slope or 'Z~ of right channel bank = 6.000
~ Estimated mean flow rate at midpoint of channel = 341.099(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 341.099(CFS)
, Depth of flow = 3.846(Ft.), Average velocity = 3.976(Ft/s)
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
~ Travel time = 2.47 min.
Time of concentration = 30.08 min.
~ Sub-Channel No. 1 Critical depth = 2.750(Ft.)
~ ' ' Critical flow top width = 29.750(Ft.)
' ' '- Critical flow velocity= 7.139(Ft/s)
~ ~ ' Critical flow area = 47.781(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
, Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.900(In/Hr) for a 100.0 year stornt
Subarea runoff = 21.418(CFS) for 15.000(Ac.)
Total runoff = 344.837(CFS) Total area = 152.200(AC.)
~
++++++++++++++++++++++++++++ ++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
~ **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1072.300(Ft.)
Downstream point elevation = 1068.900(Ft.)
~ Channel length thru subarea = 620.000(Ft.)
Channel base width = 20.000(Ft.)
Slope or ~Z' of left channel bank = 4.000
~ Slope or ~Z~ of right channe l bank = 40.000
Estimated mean flow rate at
Manning' s' N' = 0. 030 midpoint of channel = 359.564(CFS)
~o;~,lj
' Maximum depth of channel = 6.000(Ft.)
,~_
, Flow(q) thru subarea = 359.564(CFS)
' Depth of flow = 1.690(Ft.), Average velocity = 3.721(Ft/s)
Channel flow top width = 94.361(Ft.)
Flow Velocity = 3.72(Ft/s)
Travel time = 2.78 min.
, Time of concentration = 32.86 min.
Sub-Channel No. 1 Critical depth = 1.367(Ft.)
' ' ' ' Critical flow top width = 80.156(Ft.)
~ ~ ~ Critical flow velocity= 5.252(Ft/s)
' ' ' Critical flow area = 68.466(Sq.Ft)
1 Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.745
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.810(In/xr) for a 100.0 year storm
~ Subarea runoff = 17.538(CFS) for 13.000(Ac.)
Total runoff = 362.376(CFS) Total area = 165.200(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
_ **** IMPROVED CHANNEL TRAVEL TIME ****
^ Upstream point elevation = 1068.900(Ft.)
Downstream point elevation = 1061.500(Ft.)
' Channel length thru subarea = 750.000(Ft.)
Channel base width 10.000(Ft.)
Slope or 'Z' of left channel bank = 2.000
~ Slope or 'Z~ of right channel bank = 2.000
Estimated mean flow rate at midpoint of channel = 377.731(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
~ Flow(q) thru subarea = 377.731(CFS)
Depth of flow = 2.986(Ft.), Average velocity = 7.920(Ft/s)
Channel flow top width = 21.944(Ft.)
' Flow Velocity-= 7.92(Ft/s)
Travel time 1.58 min.
Time of concentration = 34.44 min.
, Sub-Channel No. 1 Critical depth = 2.906(Ft.)
' ' ' Critical flow top width = 21.625(Ft.)
' ' ' Critical flow velocity= 8.220(Ft/s)
, ' ' ' Critical flow area = 45.955(Sq.Ft)
Adding area flow to channel
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.742
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
~a~
' 7~ 4
Rainfall intensity = 1.764(In/Hr) for a 100.0 year storm
, Subarea runoff = 18.324(CFS) for 14.000(Ac.)
Total runoff = 380.700(CFS) Total area = 179.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
' The following data inside Main Stream is listed:
In Main Stream number: 2
' Stream flow area = 179.200(Ac.)
Runoff from this stream = 380.700(CFS)
Time of concentration = 34.44 min.
Rainfall intensity = 1.764(In/Hr)
~ Program is now starting with Main Stream No. 3
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** USER DEFINfiD FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 2.787(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.875
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 56.00
Pervious area fraction = O.1Q0; Impervious fraction = 0.900
User specified values are as follows:
' TC = 15.00 min. Rain intensity = 2.79(In/Hr)
Total area = 87.00(Ac.) Total runoff = 108.00(CFS)
,
II
~;
~
,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside
In Main Stream number: 3
Stream flow area = 87
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
Main Stream
.000(AC.)
108.000(CFS)
15.00 min.
2.787(In/Hr)
Stream Flow rate TC
~ No. (CFS) (min)
1 841.271
~ 2 380.700
3 108.000
' Largest
Qp = stream
841.271
Qb
380.70
', Qb
37.19
34.44
15.00
flow has longer
+ sum of
Ia/Ib
0 * 0.959 =
Ia/Ib
Rainfall Intensity
(in/Hr)
1.691
1.764
2.787
time of concentration
364.944
`a1
7Z s
108.000 * 0.607 = 65.548
Qp = 1271.763
Total of 3 main streams to confluence:
Flow rates before confluence point:
841.271 380.700 108.000
Area of streams before confluence:
536.500 179.200 87.000
Results of confluence:
Total flow rate = 1271.763(CFS)
Time of concentration = 37.187 min.
Effective stream area after confluence = 802.700(AC.)
End of computations, total study area = 802.70 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.789
Area averaged RI index number = 74.1
~~~
,
L
~
,
'
75!
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:798CH.out
-------------------------------------------------
TR 29798 (NORTH HALF) DEVELOPED & TR 30264 (SOUTH HALF) EXISTING
WITH OFF-SITES DETAINED
100 YEAR STORM
JN 32006
********* HydrolOgy SCUdy COntr01 IrifOrntatiOn ++********
English (in-lb) Units used in input data file
' ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
' Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual t
, Storm event (year) = 100.00 Anteceden~t Moisture Condition = 2
I
Standard intensity-duration curves dat~ (Plate D-4.1)
, For the [ Murrieta,'I1nc,Rnch CaNOrco ] area used.
10 year storm 10 minute intensity = 2~.360(In/Hr)
10 year storm 60 minute intensity = OI.880(In/Hr)
' 100 year storm 10 minute intensity = 3.480(In/Hr)
100 year storm 60 minute intensity = i.300(In/Ar)
Storm event year = 100.0 i
' Calculated rainfall intensity data: i
1 hour intensity = 1.300(In/Hr) ~
Slope of intensity duration curve = 0.5500
1
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
' **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 1.691(In/Hr) for a 100.0 year storm
' UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.755
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.700
~ Decimal fraction soil group C= 0.300
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 80.40
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
TC = 37.19 min. Rain intensity = 1.69(In/Hr)
Total area = 802.70(Ac.) Total,runoff = 1271.76(CFS)
~ \~°~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 84.000 to Point/Station 85.000
' **** IMPROVED CHANNEL TRAVEL TIME ****
,
,
i
'
~~
~
~~
J
LJ
r
` A
'
'
'
1
,
'
,
'
~
,
75Z
Upstream point elevation = 1059.000(Ft.)
Downstream point elevation = 1053.100(Ft.)
Channel length thru subarea = 590.000(Ft.)
Channel base width = 40.000(Ft.)
Slope or ~Z' of left channel bank = 4.000
Slope or 'Z' of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1273.083(CFS)
Depth of flow = 2.750(Ft.), Average velocity =
Channel flow top width = 61.997(Ft.)
Flow Velocity = 9.08(Ft/s)
Travel time = 1.08 min.
Time of concentration = 38.27 min.
1273.083(CFS)
9.079(Ft/s)
Sub-Channel No. 1 Critical depth = 2.844(Ft.)
~ ~ ' Critical flow top width = 62.750(Ft
~ ' ' Critical flow velocity= 8.714(Ft/s)
' ' ' Critical flow area = 146.098(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.595
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 61.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.665(In/Hr) for a 100.0 year stozm
Subarea runoff = 1.655(CFS) for 1.670(Ac.)
Total runoff = 1273.415(CFS) Total area = 804.370(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 85.000 to Point/Station 55.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 804.370(AC.)
Runoff from this stream = 1273.415(CFS)
Time of concentration = 38.27 min.
Rainfall intensity = 1.665(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.000 to Point/Station 5.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 3.207(In/Hr) for a 100.0 year storm
CONII~7ERCIAL subarea type
Runoff Coefficient = 0.878
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000 ~O
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
, 753
Pervious area fraction = 0.100; Impervious fraction = 0.900
, User specified values are as follows:
TC = 11.62 min. Rain intensity = 3.21(In/Hr)
Total area = 7.60(AC.) Total runoff = 21.50(CFS)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.000 to Point/Station 5.000
, **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal stream number 2
' Stream flow area = 7.600(AC.)
Runoff from this stream = 21.500(CFS)
Time of concentration = 11.62 min.
Rainfall intensity = 3.207(In/Hr)
' Summary of stream data:
Stream Flow rate TC Rainfall Intensity
, No. (CFS) (min) (In/Hr)
1 1273.415 38.27 1.665
' 2 21.500 11.62 3.207
Largest stream flow has longer time of concentration
Qp = 1273.415 + sum of
~ Qb Ia/Ib
21.500 * 0.519 = 11.162
Qp = 1284.576
' Total of 2 streams to confluence:
Flow rates before confluence point:
1273.415 21.500
' Area of streams before confluence:
804.370 7.600
Results of confluence:
' Total flow rate = 1284.576(CFS)
Time of concentration = 38.270 min.
Effective stream area after confluence = 811.970(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 85.000 to Point/Station 86.000
, **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 1053.100(Ft.)
' Downstream point elevation = _1042.300(Ft.)
Channel length thru subarea 1070.000(Ft.)
Channel base width = 40.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000
' Slope or ~Z' of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel = 1286.989(CFS)
Manning's 'N~ = 0.028
~ Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1286.989(CFS)
Depth of flow = 2.759(Ft.), Average velocity = 9.139(Ft/s)
, Channel flow top width = 62.074(Ft.)
Flow Velocity = 9.14(Ft/s)
Travel time = 1.95 min. n~~
Time of concentration = 40.22 min. ~~
~
,
~
Sub-Channel No. 1 Critical depth = 2.875(Ft.)
' ' ' Critical flow top width = 63.000(Ft
' ' ' Critical flow velocity= 8.692(Ft/s)
' ' ' Critical flow area = 148.063(Sq.Ft)
' Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.645
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
' Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 67.50
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.620(In/Hr) for a 100.0
, Subarea runoff = 3.184(CFS) for 3.050(AC.)
Total runoff = 1287.761(CFS) Total area = 815
,
,
~I
u
,
'
= 0.000
year storm
020(AC.)
7s4
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 86.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 815.020(AC.)
Runoff from this stream = 1287.761(CFS)
Time of concentration = 40.22 min.
Rainfall intensity = 1.620(In/Hr)
++++++++++++++++++++++++++++++_++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.020 to Point/Station 5.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.793(In/Hr) for a 100.0 year stonn
' APARTMENT subarea type
Runoff Coefficient = 0.860
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
, Pervious area fraction = 0.200; Impervious fraction = 0.800
User specified values are as follows:
TC = 14.94 min. Rain intensity = 2.79(In/Hr)
' Total area = 14.50(Ac.) Total runoff = 33.81(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 5.020 to Point/Station 5.020
**** CONFLUENCE OF MZNOR STREAMS ****
' Along Main Stream number: 1 in nozmal stream number 2
Stream flow area = 14.500(Ac.)
Runoff from this stream = 33.810(CFS)
' Time of concentration = 14.94 min.
Rainfall intensity = 2.793(In/Hr)
Summary of stream data: 2p`~i
' Stream Flow rate TC Rainfall Intensity
, No.
'
'
'
t
Ir
J
,
(CFS) (min)
1 1287.761 40.22
2 33.810 14.94
Largest stream flow has longer
Qp = 1287.761 + sum of
Qb Ia/Ib
33.810 * 0.580 =
Qp = 1307.371
(In/Hr)
1.620
2.793
time of concentration
19.610
Total of 2 streams to confluence:
Flow rates before confluence point:
1287.761 33.810
Area of streams before confluence:
815.020 14.500
Results of confluence:
Total flow rate = 1307.371(CFS)
Time of concentration = 40.221 min.
Effective stream area after confluence =
829.520(AC.)
755
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 87.000
**** IMPROVED CHANNEL TRAVEL TIME ****
' Upstream point elevation = 1042.300(Ft.)
Downstream point elevation = 1037.000(Ft.)
' Channel length thru subarea = 530.000(Ft.)
Channel base width 40.000(Ft.)
Slope or ~Z~ of left channel bank = 4.000
Slope or 'Z' of right channel bank = 4.000
' Estimated mean flow rate at midpoint of channel = 1308.593(CFS)
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
' Flow(q) thru subarea = 1308.593(CFS)
Depth of flow = 2.792(Ft.), Average velocity = 9.159(Ft/s)
Channel flow top width = 62.339(Ft.)
, Flow Velocity_= 9.16(Ft/s)
Travel time 0.96 min.
Time of concentration = 41.19 min.
' Sub-Channel No. 1 Critical depth = 2.906(Ft.)
' ' ' Critical flow top width = 63.250(Ft.)
' ' ' Critical flow velocity= 8.722(Ft/s)
, ' ' ' Critical flow area = 150.035(Sq.Ft)
Adding area flow to channel
UNDE\7ELOPED (good cover) subarea
, Runoff Coefficient = 0.642
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
' Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.599(In/Hr) for a 100.0 year stonn 1
Subarea runoff = 1.591(CFS) for 1.550(Ac.) ~j ~
Total runoff = 1308.963(CFS) Total area = 831.070(Ac.)
'
' 7~
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 87.000 to Point/Station 87.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 1 in normal stream number 1
Stream flow area = 831.070(AC.)
Runoff from this stream = 1308.963(CFS)
' Time of concentration = 41.19 min.
Rainfall intensity = 1.599(In/Hr)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.030 to Point/Station 5.030
**** USER DEFINED FLOW INFORMATION AT A POINT ****
'
'
'
LJ
'
'
1
,
'
Rainfall intensity = 2.842(In/Hr) for a 100.0 year storm
SINGLE FAMZLY (1/4 Acre Lot)
Runoff Coefficient = 0.801
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 14.47 min. Rain intensity = 2.84(In/Hr)
Total area = 5.50(AC.) Total runoff = 12.62(CFS)
++++++++++++++++++++++++++++++.++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.030 to Point/Station 5.030
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 5.500(Ac.)
Runoff from this stream = 12.620(CFS)
Time of concentration = 14.47 min.
Rainfall intensity = 2.842(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 1308.963 41.19 1.599
2 12.620 14.47 2.842
Largest stream flow has longer time of concentration
' Qp = 1308.963 + sum of
Qb Ia/Ib
12.620 * 0.563 = 7.099
Qp = 1316.062
~ Total of 2 streams to confluence:
Flow rates before confluence point:
~ 1308.963 12.620
Area of streams before confluence:
831.070 5.500 Zp~i
Results of confluence:
, Total flow rate = 1316.062(CFS)
' 7~7
Time of concentration = 41.186 min.
, Effective stream area after confluence = 836.570(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 87.000 to Point/Station 88.000
**** IMPROVED CHANNEL TRAVEL TIME ****
, Upstream point elevation = 1037.000(Ft.)
Downstream point elevation = 1028.500(Ft.)
Channel length thru subarea = 860.000(Ft.)
' Channel base width = 40.000(Ft.)
Slope or 'Z~ of left channel bank = 4.000
Slope or ~Z~ of right channel bank = 4.000
Estimated mean flow rate at midpoint of channel = 1318.005(CFS)
' Manning's 'N' = 0.028 _
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 1318.005(CFS)
' Depth of flow = 2.813(Ft.), Average velocity = 9.143(Ft/s)
Channel flow top width = 62.502(Ft.)
Flow Velocity = 9.14(Ft/s)
Travel time = 1.57 min.
' Time of concentration = 42.75 min.
Sub-Channel No. 1 Critical depth = 2.906(Ft.)
t ' ' ' Critical flow top width = 63.250(Ft.)
' ' ' Critical flow velocity= 8.785(Ft/s)
' ' ' Critical flow area = 150.035(Sq.Ft)
~
~
1
'
,
~
l.J
,
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.638
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
Pervious area fraction = 1.000; Impervious fraction
Rainfall intensity = 1.566(In/Hr) for a 100.0
Subarea runoff = 2.470(CFS) for 2.470(Ac.)
Total runoff = 1318.532(CFS) Total area = 839
= 0.000
year storm
040(AC.)
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
Stream flow area = 839.
Runoff from this stream =
Time of concentration =
Rainfall intensity = 1
1 in norntal stream number 1
040(Ac.)
1318.532(CFS)
42.75 min.
.566(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 5.060 to Point/Station 5.060 ~
**** USER DEFINED FLOW INFORMATION AT A POINT **** ~~
Rainfall intensity = 2.626(In/Hr) for a 100.0 year storm
' SINGLE FAMZLY (1/4 Acre Lot)
'
'
,
'
'
11
'
'
1
~j
'
Runoff Coefficient = 0.795
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 16.71 min. Rain intensity = 2.63(In/Hr)
Total area = 13.04(AC.) Total runoff = 21.58(CFS)
?SS
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.060 to Point/Station 5.060
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 13.040(Ac.)
Runoff from this stream = 21.580(CFS)
Time of concentration = 16.71 min.
Rainfall intensity = 2.626(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 1 318.532 42.75
2 21.580 16.71
Largest stream flow has longer
Qp = 1318.532 +.s um of
Qb Ia/Ib
21.580 * 0.596 =
Qp = 1331.404
Rainfall Intensity
(In/Hr)
1.566
2.626
time of concentration
12.872
' Total of 2 streams to confluence:
Flow rates before confluence point:
1318.532 21.580
, Area of streams before confluence:
839.040 13.040
Results of confluence:
Total flow rate = 1331.404(CFS)
, Time of concentration = 42.754 min.
Effective stream area after confluence = 852.080(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
1
1
~
'
Along Main Stream number: 1 in noxmal stream number 1
Stream flow area = 852.080(AC.)
Runoff from this stream = 1331.404(CFS)
Time of concentration = 42.75 min.
Rainfall intensity = 1.566(In/Hr)
~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 8.050 to Point/Station 8.050
**** USER DEFINED FLOW INFORMATION AT A POINT ****
~ 75q
~ Rainfall intensity = 2.139(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.778
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 62.50
~ Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 24.26 min. Rain intensity = 2.14(In/Hr)
~ Total area = 110.76(AC.) Total runoff = 200.35(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 8.050 to Point/Station 8.050
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in noxmal stream number 2
Stream flow area = 110.760(Ac.)
~ Runoff from this stream = 200.350(CFS)
Time of concentration = 24.26 min.
Rainfall intensity = 2.139(In/Hr)
Summary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~~ 1 1331.404 42.75 1.566
2 200.350 24.26 2.139
~ Largest stream flow has longer time of concentration
Qp = 1331.404 + sum of
Qb Ia/Ib
~ 200.350 * 0.732 = 146.'I05
Qp = 1478.109
~ Total of 2 streams to confluence:
Flow rates before confluence point:
1331.404 200.350
Area of streams before confluence:
~ 852.080 110.760
Results of confluence:
Total flow rate = 1478.109(CFS)
~ Time of concentration = 42.754 min.
Effective stream area after confluence = 962.840(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 89.000
**** IMPROVED CHANNEL TRAVEL TIME ****
, Upstream point elevation = 1028.100(Ft.)
Downstream point elevation = 1020.600(Ft.)
Channel length thru subarea = 920.000(Ft.) .`
~ Channel base width = 44.000(Ft.) ~
Slope or ~Z~ of left channel bank = 4.000
Slope or 'Z' of right channel bank = 4.000
~ Estimated mean flow rate at midpoint of channel = 1480.181(CFS)
~ Manning's 'N' = 0.028
~ Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1480.181(CFS)
Depth of flow = 3.022(Ft.), Average velocity = 8.731(Ft/s)
Channel flow top width = 68.179(Ft.)
~ Flow Velocity-= 8.73(Ft/s)
Travel time 1.76 min.
Time of concentration = 44.51 min.
~ Sub-Channel No. 1 Critical depth = 2.969(Ft.)
' ' ' Critical flow top width = 67.750(Ft.)
' ~ ' Critical flow velocity= 8.923(Ft/s)
' ' ' Critical flow area = 165.879(Sq.Ft)
Adding area flow to channel
~ ' UNDEVELOPED (good cover) subarea
~ Runoff Coefficient = 0.634
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 67.50
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.532(In/Hr) for a 100.0 year stonn
Subarea runoff = 2.624(CFS) for 2.700(AC.)
~ Total runoff = 1480.732(CFS) Total area = 965.540(AC.)
7 (. b
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
~~ Along Main Stream number: 1 in noxmal stream number 1
Stream flow area = 965.540(AC.)
Runoff from this stream = 1480.732(CFS)
~ Time of concentration = 44.51 min.
Rainfall intensity = 1.532(In/Hr)
~~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 9.020 to Point/Station 9.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
, Rainfall intensity = 2.801(In/Hr) for a 100.0 year storni
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.800
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 62.50
Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
~ TC = 14.86 min. Rain intensity = 2.80(In/Hr)
Total area = 31.98(AC.) Total runoff = 51.17(CFS) ~
~1 ~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 9.020 to Point/Station 9.020
~ **** CONFLUENCE OF MINOR STREAMS.****
,~
Along Main Stream number:
I~ Stream flow area = 31
Runoff from this stream =
~ Time of concentration =
Rainfall intensity =
Summary of stream data:
1 in normal stream number 2
.980(AC.)
51.170(CFS)
14.86 min.
2.801(In/Hr)
Stream Flow rate TC
~~ No. (CFS) (min)
I~
~
~
~
~
~1'
a~,
~
~
~
~.
1 1480.732 44.51
2 51.170 14.86
Larg est stream flow has longer
Qp = 1480.732 + sum of
Qb Ia/Ib
51.170 * 0.547 =
Qp = 1508.720
Rainfall Intensity
(In/Hr)
1.532
2.801
time of concentration
27.988
Total of 2 streams to confluence:
Flow rates before confluence point:
1480.732 51.170
Area of streams before confluence:
965.540 31.980
Results of confluence:
Total flow rate = 1508.720(CFS)
Time of concentration = 44.510 min.
Effective stream area after confluence = 997.520(AC.)
7~1
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 997.520(AC.)
Runoff from this stream = 1508.720(CFS)
Time of concentration = 44.51 min.
Rainfall intensity = 1.532(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 1.946(In/Hr) for a 100.0 year storm
CONID7ERCZAL subarea type
Runoff Coefficient = 0.869
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
User specified values are as follows:
TC = 28.82 min. Rain intensity = 1.95(In/Hr) n p~
Total area = 7.22(Ac.) Total runoff = 14.56(CFS) ~~
~
~~
~
'~
~,
~~
~
,~
~~
~
~
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station
**** CONFLUENCE OF MINOR STREAMS ****
7~~
1206.000
Along Main Stream number:
Stream flow area = 7
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
1 in norntal stream number 2
.220(Ac.)
14.560(CFS)
28.82 min.
1.946(In/Hr)
Stream Flow rate TC
No. (CFS) (min)
1 1 508.720 44.51
2 14.560 28.82
Largest stream flow has longer
Qp = 1508.720 + sum of
Qb Ia/Ib
14.560 * 0.787 =
Qp = 1520.185
Rainfall Intensity
(In/Hr)
1.532
1.946
time of concentration
11.464
Total of 2 streams to confluence:
Flow rates before confluence point:
1508.720 14.560
Area of streams before confluence:
997.520 7.220
Results of confluence:
Total flow rate = 1520.185(CFS)
Time of Concentration = 44..510 min.
Effective stream area after confluence = 1004.740(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 89.000 to Point/Station 89.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 1004.740(AC.)
Runoff from this stream = 1520.185(CFS)
Time of concentration = 44.51 min.
Rainfall intensity = 1.532(In/Hr)
~ }~'} }}}}}}} t}}} i"Y T**** Y Y Y Y Y Y Y Y Y Y?? Y't t T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T T
Process from Point/Station 11.050 to Point/Station 11.050
**** USER DEFINED FLOW INFORMATZON AT A POINT ****
~ Rainfall intensity = 2.410(In/Hr) for a 100.0 year storm
CONDOMINIUM subarea type
Runoff Coefficient = 0.805
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~~ RI index for soil(AMC 2) = 56.00 ~
Pervious area fraction = 0.350; Impervious fraction = 0.650 ~i
User specified values are as follows:
' TC = 19.53 min. Rain intensity = 2.41(In/Hr)
~ j, Total area =
~
~
~
52.75(Ac.) Total runoff = 103.62(CFS)
76 3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 11.050 to Point/Station 11.050
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in noxmal stream number 2
Stream flow area = 52.750(Ac.)
Runoff from this stream = 103.620(CFS)
Time of concentration = 19.53 min.
Rainfall intensity = 2.410(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~~
~ 1 1520.185 44.51 1.532
2 103.620 19.53 2.410
Largest stream flow has longer time of concentration
Qp = 1520.185 + sum of
~ Qb Ia/Ib
103.620 * 0.636 = 65.869
Qp = 1586.053
Total of 2 streams to confluence:
Flow rates before confluence point:
1520.185 103.620
Area of streams before confluence:
1004.740 52.750
Results of confluence:
Total flow rate = 1586.053(CFS)
Time of concentration = 44.510 min.
Effective stream area after confluence = 1057.490(Ac.)
End of computations, total study area = 1057.49 (AC.)
The following figures may
be used for a unit hydrograph study of the same area.
~ Area averaged pervious area fraction(Ap) = 0.868
Area averaged RI index number = 75.7
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Trapezoidal Channel Analysis & Design
Open Channel - Uniform flow
Worksheet Name: TR 29798 / JN 32006
Comment: INTERIM DIVERSION CHANNEL
Solve For Discharge
Given Input Data:
Bottom Width..... 10.00 ft
Left Side Slope.. 2.00:1 (H:V)
Right Side Slope. 2.00:1 (H:V)
Manning's n...... 0.020
Channel Slope.... 0.0010 ft/ft
Depth............ 6.30 ft
Computed Results:
Discharge........ 804.55 cfs
Velocity......... 5.65 fps
Flow Area........ 142.38 sf
Flow Top Width... 35.20 ft
Wetted Perimeter. 38.17 ft
Critical Depth... 4.38 ft
Critical Slope... 0.0045 ft/ft
Froude Number.... 0..50 (flow is Subcritical)
, Open Channel Flow Module, Version 3.43 (c) 1991
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
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Rectangular Channel Analysis & Design
Open Channel - Uniform flow
Worksheet Name: TR 30264 / JN 32006
Comment: EXIST. DBL 15'WXS'H RCB @ WOLF VALLY
Solve For Depth
Given Input Data:
Bottom Width.....
Manning~s n......
Channel Slope....
Discharge........
Computed Results:
Depth............
Velocity.........
Flow Area........
Flow Top Width...
Wetted Perimeter.
Critical Depth...
Critical Slope...
Froude Number....
15.00 ft
0.014
0.0107 ft/ft
814.00 cfs
2.98 ft
18.20 fps
44.73 sf
15.00 ft
20.96 ft
4.51 ft
0.0032 ft/ft
1.86 (flow is Supercritical)
, Open Channel Flow Module, Version 3.43 (c) 1991
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
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