HomeMy WebLinkAboutTract Map 30264 Developed vs Undeveloped Hydrologic Analysis (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
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• 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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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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