HomeMy WebLinkAboutDevelopedvsUndevelopedHydrologicAnalysis(Feb.7,2003)~K
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DEVELOPED VS. UNDEVELOPED HYDROLOGIC ANALYSIS
~ FOR WOLF VALLEY SPECIFIC PLAN
CITY OF TEMECULA
, TRACT 29798 AND TRACT 30264
_ FEBRUARY 7, 2003
CASE II - HYDROLOGIC CALCULATfONS FOR
EXISTING CONDITIONS VS. DEVELOPMENT OF
NORTH AND SOUTH HALVES OF WOLF CREEK
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' No.20278
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' Lend Plannin 43573 Rldge Perk Drive
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Surveyiny Ph. 909 676-6728 Fuc 809 699-0896 ~~1,'„f ~+ ~X~. ~-.30-~ *
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ATTENTION
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ERMAN HOVAGIMYAN --
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'' TELEPHONE: (909) 676-6726
RECEIVED
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EB 2 1 2003
, CITY OF TEMECULA
~ ENGINEERING DEPARTMENT
~ LOHR+ASSOCIATES INC. r1Q 2~ ~~f 8~?,Q3O °~(d
43513 RIDGE PARK DRIVE -~ JOB No.
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TEMECULA,CA92590 DATE ,
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' FAX 909-699-0896 OF
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LEGEND HYDROLOGIC SOILS GROUP MAP
- SOILS GROUP BOUNDARY
A SOILS GROUP DESICNATION FOR
R C F C 8i W C D PECHANGA
r~Y6ROLOUY 1~/IANUAL ~
0 FEET Sppp
PLATE C-1.61
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100
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LIMITATIONS~
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I. Maximum Isnqih = 1000 Feet
2. Maximum area = 10 Acrss
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6~-Sinqle Family-5,000 if2 Lot F
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20- Single Family-I Acre Lot 35
6 10 - Sinqle Family- 2 I/2 Acre Lot
I00 40
EXAMPLE~
5 ( I) L= 550~, H=5.0~, K=Slnqie Famiy (5-~ Du/aC)
Development, Tc=12.6 min.
4 (2 ) L= 550~, N= 5.0~, K= Commercial
Development, Tc=9.7 min.
SAN BERNARDINO COUNTY TIME OF CONCENTRATION
NOMOGRAPH
HYDROLOGY MANUAL cno unT~ n ~ c~ io n or n
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RU N OFF COEFFICIENT CURVES
SOIL GROUP-C
COVEFi TYPE-URBAN LANDSCAPING
_ _
AMC-II
(RUNOFF
INDEX NUMBER 69)
RAIN FALL INTENSITY IN INCHES PER HOUR ~
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' Riverside County Rational Hydrology Program
CIVILCADD/CIVILDSSIGN Bngineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264AEX.out
' ------------------------------------------------------------------------
TR 30264 SXISTING CONDITION BXLUDING OFF-SITES
100 YBAR STORM
' JN 32006
------------------------------------------------------------------------
******~** Hydrology Study Contr0l InfOrcRatiOn **********
~ Bnglish (in-lb) Unite 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 inteneity-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 stoxm 60 minute intensity = 0.880(In/Hr)
100 year stoxm SO minute intensity = 3.480(In/Hr)
' 100 year stozm 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
,
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
**** INITIAL AREA BVALUATION ****
Initial area flow distance = 1000.000(Ft.)
Top tof initiai area) elevation = 1148.o00(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
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction aoil 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
' '~~
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 CHANNSL TIMB + SUBAREA FLOW ADDITION +***
' Top of natural channel elevation = 1130.300(Ft.)
$nd of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
' Bstimated 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(Sngliah Unita)".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 waterfalla (Plate D-6.2)
Normal channel slope = 0.0156
, Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 atin. TC = 22.49 min.
' Adding area flow to channel
UAmavSLOPSD (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 stonn
Subarea runoff = 32.632(CFS) for 19.000(Ac.)
Total runoff = 51.832(CFS) Total area = 29.000(Ac.)
' +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++t+++++t++++
Procesa from Point/Station 102.000 to Point/Station 103.000
' **** NATURAL CHANNBL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1115.000(Ft.)
' Bnd of natural channel elevation = 1100.500(Ft.)
Length of natural channel = 1020.000(Ft.)
$stimated mean flow rate at midpoint of channel = 67.203(CFS)
, Natural valley channel type used
L.A. County flood control district fonnula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Sngliah Units)".352)(slope"0.5)
' velocity using mean channel flow = 5.o3(Ft/s)
Correction to map slope used on extremely rugged channels with
' dropa and waterfalis (Plate D-6.2)
Normal channel slope = 0.0142
Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min. ~~
'
^ fo3
^
' Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
, Decimal fraction soil group 8= 1.000
Decimal fractioa soil group C= 0.000
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) ~ 7g.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 2.065(In/Hr) for a 500.0 year storm
Subarea runoff = 27.039(CFS) for 17.200(Ac.)
' Total runoff = 78.870(CPS) Total area = 46.200(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
**'* NATURAL CHANNSL TIMB + SUSARSA FLOW ADDITION ****
~ Top of natural channel elevation = 1100.500(Ft.)
Bnd 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 district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.69(Pt/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalis (Plate D-6.2)
Nozmal channel slope = 0.0112
' Corrected/adjusted channel alope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
'
'J
L
,
'
'
,
'
,
Adding area flow to channel
UNDSVSLOPSD (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
Rainfall intensity = 2.002(In/Hr) for a 100.0
Subarea runoff = 0.758(CFS) for 0.500(AC.?
Total runoff = 79.629(CFS) Total area = 46.
= 0.000
year storm
700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
***+ CONFLIIBNCE OF MINOR STREAMS **t*
Along Main Stream number: 1 in nosmal stream number 1
Stream flow area = 46.700(AC.)
Runoff from this etream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(In/Hr)
\~
, l04
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 104.000 to Point/Station 105.000
***• INITIAL ARSA SVALUATION ****
~ Initial area flow distance = 785.000(Ft.)
Top (of initial area) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.000(Ft.)
t 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 storn~
UNDSVSLOPSD (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
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 CHANNSL TIMS + SUBARRA 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.)
Sstimated 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(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 waterfalle (Plate D-6.2)
Nozmal channel slope = 0.0145
Corrected/adjusted channel slope = 0.0145
Travel time = 4.75 min. TC = 21.81
Adding area flow to channel
UNDBVSLOPBD (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
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 stoxm
.000(Ac.)
= 22.000(AC.)
~~
CJ
'
,
~
'
~
'
'
~'
'
'
'
~
'
'
'
'
'
105
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceae from Point/Station 306.000 to Point/Station 107.000
**++ NATURAL CHANNSL TIMB + SIIBARSA FLOW ADDITION •***
Top of natural channel elevation = 1116.000(Ft.)
$nd of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 1260.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 50.366(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Sngliah Units)".352)(slope"0.5)
Velocity uaing mean channel flow = 4.91(Ft/s)
Correction to map slope used on extremely zugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0160
Corrected/adjusted channel slope = 0.0160
Travel time = 4.28 mi.n. TC = 26.08
Adding area flow to channel
UNDHVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.761
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious
Rainfall intensity = 2.056(In/Hr) for
Subarea runoff = 14.857(CFS) for 9
Total runoff = 56.279(CFS) Total area
min.
fraction = 0.000
a 100.0 year stozm
.500(Ac.)
= 31.500(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLTJSNCB OP MINOR STR$AMS •***
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
L
argest stream flow hae longer
~ 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: ~~
' lo~
Flow rates before confluence point:
79.629 56.279
' Area of atreams 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.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 107.000 to Point/Station 110.000
, ***• NATURAL CHANNSL TIMB + SUSAR$A FLOW ADDITION ****
Top of natural channel elevation = 1095.800(Ft.)
' $nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 910.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 143.899(CFS)
' Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unita)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0091
Corrected/adjuated channel slope = 0.0091
' Travel time = 3.00 min. TC = 30.36 min.
Adding area flow to channel
' UNDSVBLOPBD (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
' Decimal fraction soil group 8= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
' Total runoff = 150.057(CFS) Total area = 89.200(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 130.000
**** CONFLUSNC$ OF MINOR STRfiAMS ****
' Along Main Stream number: 1 in noxmal stream number 1
Stream flow area = 89.200(AC.)
Runoff from thie atream = 150.057(CPS)
, Time of concentration = 30.36 min.
Rainfall intenaity = 1.891(In/Hr)
' ++++++++++++++++++++++++++++++++++t+++++++++++++~+++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL ARBA SVALUATION **'** \~
'
,
LJ
~
~
'
,
C
Initial area flow distance = 710.000(Ft.)
Top (of iaitial 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
UND$vSLOPBD (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil{AMC 2) = 78.00
0 year stox~
Pervious area fraction = 1.000; Impervious fraction
Initial subarea runoff = 17.875(CFS)
Total initial stream area = 8.600(AC.)
Pervious area fraction = 1.000
0.000
l07
+++++++++++++++++++++++++++++*+++++++++++++++++++~++++++++++++++++++++
~ Process from Point/Station 109.000 to Point/Station 130.000
***+ NATURAL CHANNSL TIMB + SUBARBA FLOW ADDZTION ****
,
'
'
,
'
'
'
'
1
'
'
Top of natural channel elevation = 1100.000(Ft.)
Bnd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
Estimated mean flow rate at midpoint of channel = 25.046(CFS)
Natural valley channel type used
I,.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.51(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0121
Corrected/adjuated channel alope = 0.0121
Travel time = 4.89 min. TC = 21.46 min.
Adding area flow to channel
UND$VSLOPBD (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fractioa 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
**** CONFLUFNCS OF MSNOR STREAMS **** ~~
' l08
Along Main Stream number: 1 in noxmal stream number 2
Stream flow area = 15.500(Ac.)
, Runoff from this atream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall intensity = 2.289(In/Hr)
~ Su~nary of atream 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
L~argest etream flow has longer time of concentration
= 150.057 + sum of
' Qb Ia/ib
30.081 * 0.826 = 24.853
Qp = 174.910
t Total of 2 streams to confluence:
Flow rates before confluence point:
150.057 30.081
~ Area of etreams before confluence:
89.200 15.500
Results of confluence:
~ Total flow rate = 174.910(CFS)
Time of concentration = 30.362 min.
Sffective etream area after confluence = 104.700(AC.)
~ +~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 123.000
~ •+** NATURAL CHANNBL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1087.500(Ft.)
~ &nd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 675.000(Ft.)
Estimated mean flom rate at midpoint of channel = 189.778(CFS)
~ Natural valley channel type uaed
L.A. County flood control diatrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unita)".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 min.
~
Adding area flow to channel
~ UNDSVSLOPBD (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
'
~
~
~
~
~
~,
I
~
~
'
'
1
,~
~
'
Rainfall intensity = 1.809(In/Hr) for a 100.0 year stoxm
Subarea runoff = 23.997(CPS) for 17.800(AC.)
Total runoff = 198.907(CFS) Total area = 122.500(AC.)
l09
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
**+• CONFLUSNCE 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
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 111.000 to Point/Station 112.000
**** INITIAL AR&A EVALUATION ****
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 intenaity = 2.821(In/Hr) for a 100.0 year stoxm
UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.815
Decimal fraction soil group A= 0.000
Decisnal 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; Impezvious 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 CHANNSL TIMS + SUBARHA FLOW ADDITION *+**
Top of natural channel elevation = 1135.300(Ft.)
Bnd of natural channel elevation = 1122.600(Ft.)
Length of natural channel = 510.000(Ft.)
Sstimated 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(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.66(Ft/s)
Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2)
Normal channel slope = 0.0154
``~
~ ( lo
Corrected/adjusted channel slope = 0.0154
Travel time = 2.90 min. TC = 17.56 min.
~
Adding area flow to channel
UNDBVSLOP~ (poor cover) subarea
i Runoff Coefficient = 0.807
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 foz soil(AMC 2) = 82.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 2.555(In/Hr) for a 100.0 year etorm
Subarea runoff = 39.199(CFS) for 19.000(Ac.)
' Total runoff = 62.203(CFS) Total area = 29.000(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CHANNBL TIMII + SUBARBA FLOW ADDITION ***•
~ Top of natural channel elevation = 1122.800(Ft.)
8nd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
~ Bstimated mean flow rate at midpoint of channel = 82.580(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 = 4.75(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0112
~ Corrected/adjusted channel slope = 0.0112
Travel time = 3.68 min. TC = 21.25 min.
1 Adding area flom to channel
UNDSVBLOPBD (poor cover) aubarea
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.)
Totai runoff = 96.023lCFS) Total area = 48.000(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 114.000 to Point/Station 114.000
**** CONFLUSNCS OF MINOR STREAMS •**•
~ Along Main Stream number: 2 in noxmal atream number 1
Stream flow area = 48.000(AC.) p4
~ Runoff from this atream = 96.023(CFS) `
~ /"
Time of concentration = 21.25 min.
Rainfall intensity = 2.301(In/Hr)
1~,
++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.100
~ **** INITIAL ARBA EVALIIATION ****
~ 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.)
L Slope = 0.01429 s(percent)= 1.43
TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 17.69~ min.
Rainfall intensity = 2.544(In/Hr) for a 100.0 year storm
~ UNDSVELOPSD (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 stream area = 9.800(Ac.)
~, Pervious area fraction = 1.000
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
_ Process from Point/Station 115.100 to Point/Station 116.000
**** NATURAL CHANNBL TIMB + SUBAR$A FLOW ADDITION ****
, Top of natural channel elevation = 1130.OOOfFt.)
8nd of natural channel elevation = 1106.500(Ft.)
, Length of natural channel = 1340.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 30.806(CFS)
Natural valley channel type used
~ L.A. County flood control district fornrula for channel velocity:
Velocity(ft/s) _ (7 + S(q(Snglish Units)".352)(slope"0.5)
Velocity uaing mean channel flow = 4.47(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalle (Plate D-6.2)
' Normal channel slope = 0.0175
Corrected/adjusted channel slope = 0.0175
Travel time = 5.00 min. TC = 22.70 min.
~
~
~~
~
Adding area flow to channel
UNDBVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.795
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Penrious area fractio~
Rainfall intensity =
group A = 0.000
group B = 0.500
group C = 0.500
group D = 0.000
2) = 82.00
i= 1.000; Impervious fraction = 0.000
2.219(In/Hr) for a 100.0 year storm
~
~, t~2
Subarea runoff = 18.350(CFS) for 10.400(AC.)
Total runoff = 38.476(CFS) Total area = 20.200(Ac.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++t++++++++t++++++++
~ Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUSNC$ 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/Hr)
_ Summary of stream data:
~, Stream Flow rate TC Rainfall Intenaity
No. (CFS) (min) (In/Hr)
~ 1 96.023 21.25 2.301
2 38.476 22.70 2.219
L~argest stream flow has longer or shorter time of concentration
' 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.
, Sffective stream area after confluence = 68.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++
~ Process from Point/Station 116.000 to Point/Station 123.000
**** IMPROVBD CHANNSL TRAVEL TIMB *+**
~ 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 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. i Critical depth = 0.898(Ft.)
' ' ' ' Critical flow top width = 40.273(Ft.) ~
' 113
' ' ' Critical flow velocity= 4.847(Ft/s)
~ ~ ' Critical flow area = 29.322(Sq.Ft)
1 Adding area flow to channel
UND8V8LAPBD (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 etorm
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
~ **** CONFLUBbTCH OF MAIN STRBAMS ****
The following data inside Main Stream is lieted:
I 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
r +++++++++++++++++++++++++++++++++++++++++++;+;++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 117.000
' **** USBR DSFINSD FLOW INFORMATION AT A POZNT +***
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 soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soii(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)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 Process from Point/Station 117.000 to Point/Station 118.000
**** NATIJRAL CHANNSL TIMB + SUBARfiA FLOW ADDITION ****
~ Top of natural channel elevation = 1118.000(Ft.)
Snd of natural channel elevation = 1101.000(Ft.)
Length of natural channel = 790.000(Ft.)
$stimated 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:
' Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(elope"0.5) ~
~ Velocity using mean channel flow = 7.68(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0215
j Corrected/adjusted chaanel slope = 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; Impezvious 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.)
il4
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 121.000
1 **** NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1101.000(Ft.)
~ Bnd of natural channel elevation = 1090.500(Ft.)
Length of natural channel 980.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 156.251(CPS)
~ Natural valley channel type uaed
L.A. County flood control district foxmula 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)
~ Nozmal channel slope = 0.0107
Corrected/adjusted channel slope = 0.0107
Travel time = 2.90 min. TC = 21.44 min.
~ Adding area flow to channel
' UNDEVBLOPED (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
1 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.)
+++++++++++++++++++++++++++++t+++++++++++t++++++++++++++++++++++++++++
' Process from Point/Station 121.000 to Point/Station 121.000 ~
' I15
**** CONFLOSNCS OF MINOR STRBAMS ****
~ Along Main Stream number: 3 in normal 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 ARSA SVALUATION *+*+
~ 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 atoxm
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 = 0.600; 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 CHANNSL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1094.000(Ft.)
j Snd of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
Bstimated 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 + S(q(Snglish 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 waterfalis (Plate D-6.2)
Noxmal channel slope = 0.0063
Corrected/adjusted channel slope = 0.0063
I Travel time = 4.78 min. TC = 17.25 min.
~ Adding area flow to channel
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000 2~
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) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(in/Hr) for a 100.0 year stozm
Subarea runoff = 4.460(CFS) for 2.200(AC.)
Total runoff = 11.545{CFS) Total area = 5.400(AC.)
ii~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 121.000 to Point/Station 121.000
**** CONFLUSNCS OF MINOR STREAMS *+**
Along Main Stream number: 3 in normal etream number 2
Stream flow area = 5.400(AC.)
Runoff from this stream = 11.545iCFS)
Time of Concentration = 17.25 min.
Rainfall intensity = 2.581(In/Hr)
Su~nary of etream data:
Stream Flow rate TC
No. (CFS) (min)
1 163.439 21.44
2 11.545 17.25
Largest etream flom has longer
Qp = 163.439 + sum of
Qb Ia/Ib
11.545 * 0.887 =
Qp = 173.682
Rainfall Intensity
(in/Hr)
2.290
2.581
time of concentration
10.243
Total of 2 atreams to confluence:
Flow rates before confluence point: ~
163.439 11.545
Area of streams before confluence:
81.300 5.400
Reeults of confluence:
Total flow rate = 173.682(CFS)
Time of concentration = 21.438 min.
Bffective stream area after confluence = 86.700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNSL TIMB + SUBARBA FLOW ADDITION +***
Top of natural channel elevation = 1090.500(Ft.)
Snd of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.) 192.512(CFS)
$stimated mean flow rate at midpoint of channel =
Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Englieh Units)".352)tslope"0.5)
Velocity ueing mean channel flow = 3.93(Ft/s)
Correction to map slope used on extremely rugged channels with
dropa and waterfails (Plate D-6.2)
Nozmal channel slope = 0.0046
Z'~~
! "'
Corrected/adjusted channel slope = 0.0046
' Travel time = 3.14 min. TC = 24.58 min.
Adding area flow to channel
1 UNDSVSLOPSD (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 eoil 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 atorm
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 CHANNBL TIMB + SIISARSA FLOW ADDITION ****
I Top of natural channel elevation = 1087.100(Ft.)
Bnd 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 foxmula for channel velocity:
Velocity(ft/s) _ (7 ~ 8(q(Snglish Unita)".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
UNDSVBLOPED (poor cover) subarea
Runoff Ccefficient = 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 storm
' 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
' ***+ CONFLUBNCB OF MAIN STRSANIS ****
The following data inaide Main Stream is listed:
In Main Stream number: 3 ~
' Stream flow area = 114.900(AC.)
, 118
Runoff from this stream = 217.127(CFS)
' Time of concentration = 31.94 min.
Rainfall inteneity = 1.839(In/Hr)
Sua¢naxy of stream data:
, Stream Flow rate TC Rainfall intenaity
No. (CFS) (min) (Zn/Hr)
f 1 198.907 32.89 1.809
2 147.385 28.58 1.955
3 217.127 31.94 1.839
~ L
arge at stream flow has longer or shorter time of concentration
~
= 217.127 + sum of
Qa Tb/Ta
198.907 * 0.971 = 193.139
, Qb Ia/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
~ Results of confluence:
~ Total flow rate = 548.922(CFS) _
Time of concentration = 31.940 min.
Bffective stream area after confluence - 316.000(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 129.000
' **** ZMPROVSD CHANNSL TRAVSL TIMS ****
Upstream point elevation = 1083.500(Ft.)
Downstream point elevation = 3061.500(Ft.)
' Channel length thxv 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 midth = 19.142(Ft.)
~ Flom Velocity_= 12.60(Pt/s)
Travel time 1.20 min.
Time of concentration = 33.14 min.
' 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 = 59.683(Sq.Ft)
Adding area flow to channel 21
' UNDSVELOPfiD (poor cover) aubarea
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 intensity = 1.802(In/Hr) for a 300.0 year stozm
' 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
**** CONFLUBNCS OF MAIN STRBAMS ****
' The following data inside 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 starting with Main Stream No. 2
' ++++++++++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 124.000
**** INITIAL AREA BVALUATION ****
, initial area flow distance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
sottom (of initial area) elevation = 1088.oo0(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 atorm
UNDSVSLOPED (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 eoil group D= 0.000
RI index for soil(AMC 2) = 76.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
, Initial subarea runoff = 7.724(CFS)
Total initial stream area = 3.200(AC.)
Pervioua area fraction = 1.000
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
, ***• IMPROVSD CHANNSL TRAVSL TIMS ****
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 ~j
' Slope or 'Z' of right channel bank = 5.000
~ ~20
Sstimated 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)
' Chdnnel flOW tOp width a 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
~ Time of concentration = 15.60 min.
Sub-Channel No. i 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
UNDBVELOPSD (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 stoxm
' 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
**** CONFLUSNCB OF MINOR STRBANlS ****
' 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
' **** USBR D$FINBD FLOAi INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Ar) for a 100.0 year etozm
' SINGLE3 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 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 ~
, izi
**** CONFLUENCS OF MINOR STRBAMS ****
' Along Main Stream number: 2 in noxmal atream 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)
Summaxy of atream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 9.450 15.60 2.727
2 293.200 25.00 2.104
' L~argest stream flow has longer time of concentration
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.
' $ffective stream area after confluence = 122.000(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 126.000
**** IMPROVSD CHANNBL TRAVEL TIMB ****
' 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
' Betimated mean flow rate at midpoint of channel = 319.211(CFS)
Manning~e 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
' Flow(q) thru subarea = 319.211(CFS)
Depth of flow a 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
~ ~
,
,
'
i Critical depth =
' Critical flow
' Critical flow
' Critical flow
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.757
2.656(Ft
top width =
velocity=
area =
28.906(Ft.)
7.089(Ft/s)
45.032(Sq.Ft)
~
, (22
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 stoxm
Subarea runoff = 22.927(CFS) for 15.200(AC.)
, Total runoff = 323.419(CFS) Total area = 137.200(Ac.)
+++++++++++++++++++~t~++++++++++++++++++++++++++++++++++++++++++++++++
' Procesa from Point/Station 126.000 to Point/Station 127.000
**+* IMPROVSD CHANNSL TRAVSL TIMB ****
~ Upetream point elevation = 1073.700(Ft.)
Downetream point elevation = 1072.300(Ft.)
Channel length thzu 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 = 2.750(Ft.)
' ' ' ' Critical flow top width = 29.750(F[.)
' ' ' Critical flow velocity= 7.139(Ft/e)
' ' ' Critical flow area = 47.781(Sq.Ft)
' Adding area flow to channel
UNDSVBLOP$D (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; Impenrious fraction = 0.000
, Rainfall intensity = 1.900(In/Hr) for a 100.0 year etorm
Subarea runoff = 21.418(CFS) for 15.000(AC.)
Total runoff = 344.837(CFS) Total area = 152.200(Ac.y
' +++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
' **** IMPROVSD CHANNSL TRAVEL TIMB ****
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
' $stimated mean flow rate at midpoint of channel = 359.564(CFS)
, Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 359.564(CFS)
Depth of flow = 1.690(Ft.), Average velocity = 3.721(Ft/s)
' Channel flow top width = 94.361(Ft.)
Flow Velocity = 3.72(Ft/s)
Travel time = 2.78 min.
' Time of concentration = 32.86 min.
Sub-Channel No. i Critical depth = 1.367(Ft.)
' ' ' Critical flow top width = 80.156(Ft.)
, ' ' ' Critical flow velocity= 5.252(Ft/s)
' ' ' Critical flow area = 68.466(Sq.Ft)
, Adding area flow to channel
UNDBVSLOP~ (poor cover) subarea
Runoff Coefficient = 0.745
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D~ 0.000
' RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.810(In/Hr) for a 100.0 year etorn-
' Subarea runoff = 17.538(CFS) for 13.000(AC.)
Total runoff = 362.376(CFS) Total area = 165.200(Ac.)
'
,
'
,
'
'
,
'
'
1
~Z3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
**** IMPROVSD CHANN$L TRAVSL TIMB *+t*
Upstream point elevation = 1068.900(Ft.)
Downetream 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
Bstimated 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. i Critical depth = 2.906(Ft.)
' ' ' Critical flow top width = 21.625(Ft.)
' ' ' Critical flow velocity= 8.220(Ft/s)
' ' ' Critical flom area = 45.955(Sq.Ft)
Adding area flow to channel
UNDBVSLOPSD (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
3''
~ ~~~
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 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
**** CONFLUENCB OF MAIN STRSAMS ****
, The following data inside Main Stream is listed:
Zn 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
,
++++++t+++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++++++
~ Process from Point/Station 129.000 to Point/Station 129.000
**t* USBR DBFINSD FLOW INFORMATION AT A POINT ****
' Rainfall inteneity = 2.787(in/Hr) for a 100.0 year atorm
CONIl~IBRCIAL aubarea 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 apecified values are as follows:
TC = 15.00 min. Rain intensity = 2.79(In/Hr)
' Total area = 87.00(AC.) Total runoff = 108.00(CPS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUSNCS 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)
' Summary of stream data:
Stream Flow 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
~rgest stream flow has longer or shorter time of concentration ~Yj
' 553.618 + sum of
'
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 streams to confluence:
Flow rates before confluence point:
553.618 380.700 106.000
' 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. _
Sffective stream area after confluence 585.700(AC.)
Snd of computations, total study area = 585.70 (Ac.)
' Ttie following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.711
, Area averaged RI index number = 69.7
'
,
'
'
,
'
'
,
,
'
'
izs
~
,
,
1
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,
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,
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,
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'
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~
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1
150
3~'
~
' (5!
' Riverside County Rational Hydrology Program
CIVILCADD/CIVILD&SIGN Sngineering Software,(c) 1989 - 2001 Vereion 6.4
Rational Hydrology Study Date: 02/06/03 File:798ASX.out
, ------------------------------------------------------------------------
TR 29798 SXISTING CONDITION HYDROLOGY BXCLUDING OFF-SITBS
100 YSAR STORM
' JN 32006
------------------------------------------------------------------------
****+**** Hyd2'OlOgy Study COnti'O1 InfOrnldtiOn •*****'****
' 8nglish (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 inteneity-duration curves data (Plate D-4.1)
' For the ( Murrieta,7tnc,Rnch CaNorco ] area used.
10 year stonn 10 minute intensity = 2.360(In/Hr)
10 year stozm 60 minute intensity = 0.880(In/Hr)
' 100 year storm 10 minute intensity = 3.480(In/Hr)
100 year stozm 60 minute intensity = 1.300(In/Hr)
Stonn event year = 100.0
' Calculated rainfall intenaity data:
1 hour intensity = 1.300(In/Hr)
Slope of intenaity duration curve = 0.5500
1
'
'
,
~
'
~
++++++++++++++++++++++++++++++++++++++t++++++++++++++t++++++++++++++++
Process from Point/Station 100.000 to Point/Station 501.000
**** INITIAL ARSA BVALUATION ****
Initial area flow distance = 765.000(Ft.)
Top (of initial area) elevation = 1084.000(Ft.)
sottom (of initial area) elevation = 1067.5o0(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
UNDSVELOPED (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
Decimal fzaction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
year stoztn
' Pexvious area fraction = 1.000; Impervious fraction = 0.000
~
, i5z
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 CHANNBL TIMB + SUBARSA FLOW ADDITION ****
' Top of aatural channel elevation = 1067.500(Ft.)
Snd of natural channel elevation = 1055.700(Ft.)
' Length of natural channel = 1255.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 37.643(CFS)
Natural valley channel type used
, L.A. County flood control diatrict fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglish IInita)".352)(slope"0.5)
Velocity using mean channel flow = 3.46(Ft/s)
' Correction to map slope used on extremely rugged channels with
drops and waterfalis (Plate D-6.2)
Noxmal channel slope = 0.0094
, Corrected/adjusted channel slope = 0.0094
Travel time = 6.04 min. TC = 22.30 min.
' Adding area flow to channel
UNDSVSLOP$D (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.)
' +++++++++++++++++++++++++++++t++*+++++++++++++++++++++++++~++~++++++++
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.)
, 8nd of natural channel elevation = 1055.000(Ft.)
Length of natural channel 370.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 66.102(CFS)
, ~ Natural valley channel type used
L.A. County flood control district foxmula 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
' drope and waterfalis (Plate D-6.2)
Nozmal channel slope = 0.0019
Corrected/adjusted channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min. ~`~
'
'
'
'
:~
!
~
'
~
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Ccefficient = 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 e 0.000
Rainfall intensity = 2.073(In/Hr) for a 100.0 year atonn
Subarea runoff = 30.012(CPS) for 19.000(Ac.)
Total runoff = 78.324(CFS? Total area = 44.800(Ac.)
153
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 104.000
**** NATURAL CHANNBL TIMB + SUSAR&A PLOW ADDITION ****
Top of natural channel elevation = 1055.000(Ft.)
Snd of natural channel elevation = 1051.600(Ft.)
Length of natural channel = 720.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 94.059(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 = 3.20(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0047
I Corrected/adjusted channel slope = 0.0047
Travel time = 3.75 min. TC = 29.42 min.
' Adding area flow to channel
UNDEVBLOPSD (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 eoil 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
~ **** NATURAL CHANNBL TIMS + SUBARSA 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 ~
~ ~h4
L.A. County flood control district foxmula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(Bnglish 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)
Noxtaal channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
Travel time = 2.65 min. TC = 32.07 min.
,~~
Adding area flow to channel
' UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.747
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) = 78.00
' Pervious area fraction = 1.000; Impervioue fraction = 0.000
Rainfall intensity = 1.835(In/Hr) for a 100.0 year etorm
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 CHANNSL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1050.600(Ft.)
~ $nd of natural channel elevation = 1048.000(Ft.)
Length of natural channel = 650.000(Ft.)
Batimated mean flow rate at midpoint of channel = 149.367(CFS)
~'
Natural valley channel type uaed
~ L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($ngliah Unita)".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)
Normal channel slope = 0.0040
~ Corrected/adjusted channel slope = 0.0040
Travel time = 3.20 min. TC = 35.27 min.
~ Adding area flow to channel
UNDSV8LOP8D (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=
RI index for soil(AMC 2) = 80. 0.000
40
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.741( In/Hr) for a 100.0 year stonn
, Subarea runoff = 28.261(CFS) for 21.400(Ac.)
Total runoff = 160.608(CFS) Total area = 104.600(AC.)
~~
~
~ 155
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~++~+++++++
~ Process from Point/Station 106.000 to Point/Station 106.000
*+** CONFLUSNCS OF MINOR STR$AMS ****
Along Main Stream number: 1 in normal atream number 1
Stream flom area = 104.600(AC.)
~ Runoff from this etream = 160.608(CFS)
Time of concentration = 35.27 min.
~ Rainfall inteneity = 1.741(In/Sr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 Procese from Point/Station 107.000 to Point/Station 107.000
**** USSR DBFINSD FLOW INFORMATION AT A POINT ****
Rainfall intensity = 1.773(In/Hr) for a 100.0 year storm
~ UNDSVBLOPSD (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 folloms:
~~ 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 ****
~j 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
$stimated mean flow rate at midpoint of channel = 1000.000(CFS)
Manning's 'N~ = 0.030
Ma~cimum depth of channel = 7.200(Ft.)
~ Flow(q) thru subarea = 1000.000(CFS)
Depth of flow = 5.615(Ft.), Average velocity = 10.974(Ft/s)
Channel flow top width = 27.459(Ft.)
~ Flow Velocity_= 10.97(Ft/s)
Travel time 2.51 min.
Time of concentration = 36.65 min.
~I Sub-Channel No. 1 Critical depth = 5.750(Ft.)
~ ' ' Critical flow top width = 28.000(Ft.)
~ ~ ~ Critical flow velocity= 10.540(Ft/s)
u ~ ~ ' Critical flow area = 94.875(Sq.Ft)
L
Adding area flow to channel
~ UND$V8LOP8D (poor 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(In/Hr) for a 100.0 year stoxm
Subarea runoff = 15.715(CFS) for 12.000(Ac.)
~ Total runoff ~ 1005.575lCFS) Total area = 597.700(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 108.000
**** CONFLUSNCS OF MINOR STRSAMS ****
~ Along Main Stream number: 1 in nox~nal stream number 2
Stream flrnv area = 597.700(AC.)
Runoff from this stream = 1005.575(CFS)
~ Time of concentration = 36.65 min.
Rainfall intensity = 1.705(In/Hr}
Sunnnary of stream data:
~ Stream Flow rate TC Rainfall intensity
No. (CFS) (s~n) (Zn/Hr)
~ 1 160.608 35.27 1.741
2 1005.575 36.65 1.705
~ Largest stream flow has longer time of concentration
Qp = 1005.575 + sum of
Qb Ia/Ib
160.608 * 0.979 = 157.249
~ Qp = 1162.824
Total of 2 streams to confluence:
~ Flow rates before confluence point:
~ 160.608 1005.575
Area of streams before confluence:
~ 104.600 597.700
Results of confluence:
Total flow rate = 1162.824(CFS)
Time of concentration = 36.650 min.
/ 8ffective stream area after confluence = 702.300(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 108.000 to Point/Station 109.000
**** IMPROVBD CHANNSL TRAVSL 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
U Bstimated mean flom rate at midpoint of channel =~1177.725(CFS)
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 = 16.116(Ft/s)
Channel flow top width = 24.691(Ft.)
Flow Velocity = 16.12(Ft/s) ~`
,~ Travel time = 2.43 min.
~ Time of concentration = 39.08 min.
__. _
I 57
~' Sub-Channel No. 1 Critical depth = 6.250(Ft.)
~ ~ ' Critical flow top width = 30.000(Pt.)
~ ~ ~ Critical flow velocity= 10.768(Ft/s)
;~ ~ ~ ~ Critical flow area = 109.375(Sq.Pt)
~' Adding area flow to channel
~ UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.764
~` 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; Impezvious fraction = 0.000
Rainfall intenaity = 1.646(In/Hr) for a 100.0 year etoxm
Subarea runoff = 22.635(CFS) for 18.000(Ac.)
Total runoff = 1185.459(CFS) Total area = 720.300(AC.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 109.000 to Point/Station 109.000
**** CONFLLTSNCS OF MAIN STREAMS ****
~ 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 intensity = 1.646(In/Ar)
Program is now atarting with Main Stream No. 2
~' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++
~ Process from Point/Station 110.000 to Point/Station 111.000
**** INITIAL AREA SVALUATION ****
Initial area flow dietance = 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(Zn/Hr) for a 100.0 year storm
~ UNDBVSLOPBD (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
~ Pezvious area fraction = 1.000; Impervioue fraction = 0.000
Initial aubarea runoff = 12.765(CFS)
Total initial etream area = 6.700(AC.)
~ Pervious area fraction = 1.000
~v
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~.
LJ
~
1-
.~
:~
Process from Point/Station 111.000 to Point/Station 112.000
**** NATURAL CHANNBL TII~ + SUSAR$A FLOW ADDITION ****
158
Top of natural channel elevation = 1045.000(Ft.)
Snd of natural channel elevation = 1037.000(Ft.)
Length of natural channel m 960.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 19.909(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s? _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.73(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0083
Corrected/adjusted channel slope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
`~ Adding area flow to channel
UNDBVELOPBD (poor cover) subarea
~ Runoff Coefficient = 0.788
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
~ Decimal fraction soil group D= 0.000
- RI index for soil(AMC 2) = 82. 00
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 2.065( In/Hr) for a 100.0 year storm
Subarea zunoff = 12.205(CFS) for 7.500(Ac.)
Total runoff = 24.970(CFS) Total area = 14.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 112.000 to Point/Station 115.000
**** NATURAL CHANNEL TIMB + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1037.000(Ft.)
Bnd of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 560.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 27.783(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
~ Velocity(ft/s) _ (9 + 8(q($nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 2.63(Ft/s)
Correction to map slope uaed on extremely rugged channels with
drops and waterfalla (Plate D-6.2)
No=mal channel slope = 0.0064
Corrected/adjusted channel slope = 0.0064
:i Travel time = 3.55 min. TC = 29.43 min.
~ Adding area flow to channel
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000 Q3
Decimal fraction soil group B= 0.500
~
~~
.~
~.
~'
~
~
~
~
~
,~,
~.
,~,
~.
~
~
~'
,'
~
I5~
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 = 1.924(In/Hr) for a 100.0 year stozm
Subarea runoff = 4.808(CFS) for 3.200(AC.)
Total runoff = 29.778(CPS) Total area = 17.400(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
***• CONFLUSNCE3 OF MINOR STRSAMS ***•
Along Main Stream number: 2 in noxmal 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)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 113.000 to Point/Station 114.000
**** INITIAL ARIIA BVALUATION ****
Initial area flow distance = 670.000(Ft.)
Top (of initial area? elevation = 1055.200(Ft.)
Bottom (of initial area) elevation = 3047.000(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 intenaity = 2.579(In/Hr) for a 100.0 year stoxm
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.808
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 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 CHANNSL TIMII + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1047.000(Ft.)
Snd of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 1300.000(Ft.)
Sstimated 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(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.60(Ft/s)
Correction to map slope used on extremely rugged channels with ~
~.
~
~.
~'
`~
~
~
~
~
~"
drops and waterfalls (Plate D-6.2)
Noxmal channel alope = 0.0105
Corrected/adjusted 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
Rainfall intensity = 2.188lIn/Hr) for a 100.0
Subarea runoff = 25.189(CFS) for 14.500(Ac.)
Total runoff = 46.036(CFS) Total area = 24
= 0.000
year storm
500(AC.)
(Go
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLUSNCB OF MINOR STRSAMS +***
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 etream flow has longer or ahorter 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 =
Time of concentration
Sffective stream area
~'
~'
69.590(CFS)
= 23.277 min.
after confluence = 41.900(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 118.000
**** NATURAL CHANNSL TIME + SUBARSA FLOW ADDITION ****
Top of natural channel elevation =
~
Bnd
of
natural
channel 1033.400(Ft.)
elevation = 1030.500(Ft.) ~-j
~ Length of natural channel = 730.000(Ft.)
~ Bstimated mean flow rate at midpoint of channel = 71.251(CFS)
Natural valley channel type uaed
L.A. County flood control diatrict fozmula 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/adjusted channel slope = 0.0040
~' Travel time = 4.50 min. TC = 27.78 min.
J Adding area flow to channel
UNDEVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.784
Decimal fraction soil group A= 0.000
~~ Decimal fraction soil group 8= 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 a 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.)
IG~
~~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 118.000
**** CONFLUBNCS OF MINOR STREAMS ****
~ Along Main Stream number: 2 in normal stream number i
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.)
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 atorm
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
1
~
~~
~'
~
~
~
,~
~
,'
~
~
~
L~
Initial subarea runoff = 17.473(CFS)
Total initial stream area = 9.300(AC.)
Pervious area fraction = 1.000
~~z
++++++++t+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 118.000
*~** NATURAL CHANNHL TIM$ + SUBARSA FIAW ADDITION *++'•
Top of natural channel elevation = 1042.300(Ft.)
Bnd of natural channel elevation = 1030.500(Ft.)
Length of natural channel = 1430.000(Ft.)
8atimated 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(Bnglish 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)
Noxmal channel slope = 0.0083
Corrected/adjuated channel slope = 0.0083
Travel time = 7.79 min. TC = 28.27 min.
Adding area flow to channel
UNDEVSLOPED (poor cover) subarea
Runoff Coefficient 3 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 stoxm
Subarea runoff = 21.567(CFS) for 14.000(AC.)
Total runoff = 39.040(CFS) Total area = 23.300(Ac.)
+++++++++++++++++++++++++++++++++++++++f++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 118.000
**** CONFLU8NC8 OF MINOR STREAMS ****
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 intensity = 1.966(In/Hr)
Sunanazy of stream data:
Stream Flow rate TC Rainfall Inteneity
No. (CFS) (min) (In/Hr)
1 72.705 27.78 1.986
2 39.040 28.27 1.966
Largeat stream flow has longer or ahorter time of concentration
Qp = 72.705 + sum of
Qa Tb/Ta
~~
~ 1~3
39.040 * 0.982 = 38.353
Qp = 111.058
~ Total of 2 streame to confluence:
Flow rates before confluence point:
~ '72.705 39.040
Area of atreams before confluence:
43.900 23.300
Reaults of confluence:
~ Total flow rate = 111.058(CPS)
Time of concentration = 27.775 min.
Sffective etream area after confluence = 67.200(Ac.)
~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 122.000
~. **+* NATURAL CHANN$L TIMS + SUBARBA FLOW ADDITION +***
Top of natural channel elevation = 3030.500(Ft.)
,~ Snd 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 forniula for channel velocity:
" Velocity(ft/s) _ (7 + 8(q(Snglish 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)
Nornial channel slope = 0.0025
Corrected/adjusted channel slope = 0.0025
~ Travel time = 6.61 min. TC = 34.39 min.
~ Adding area flow to channel
uNDBVSLOPED (poor cover) subarea
Runoff Coefficient = 0.772
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 = 1.766(In/Hr) for a 100.0 year stoxm
~ Subarea runoff = 8.178(CFS) for 6.000(Ac.)
Total runoff = 119.236(CFS) Total area = 73.200(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
r~. Proceas from Point/Station 122.000 to Point/Station 122.000
**** CONFLUSNCS OF MINOR STRBAMS ***+
,, 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 inteneity = 1.766(In/Hr)
~ L~,a
~ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++1+ ~
Process from Poiat/Station 119.000 to Point/Station 120.000
~ **** INITIAL ARBA SVALUATION **++
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)]"0.2
Initial area time of concentration = 16.313 min.
Rainfall intensity = 2.661(In/Hr) for a 100.0 year stoxm
~ UNDSVSLOPSD (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
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
,~ Proceas from Point/Station 120.000 to Point/Station 121.000
**** NAT[JRAL CHANNBL TIN1B + 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.>
~ Setimated 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(Bnglieh 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/adjuated channel elope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
~ Adding area flow to channel
UNDBVELOPBD (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.)
~~
i~s
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Procese from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1038.000(Ft.)
$nd of natural channel elevation = 1028.000(Ft.)
,~. Length of natural channel = 1140.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 66.998(CPS)
~ Natural valley channel type used
L.A. County flood control district foimula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 3.95(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
,~. Noxmal channel slope = 0.0088
Corrected/adjusted channel slope = 0.0088
_ Travel time = 4.81 min. TC = 25.48 min.
Adding area flow to channel
~ UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
~ Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 8z.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 2.082(In/Hr) for a 100.0 year stoxm
Subarea runoff = 27.599(CFS) for 16.800(AC.)
^ Total runoff = 77.947(CFS) Total area = 42.200(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
**~* CONFLUSNC$ OF MINOR STRBAMS ****
i~ Along Main Stream number: 2 in noxmal 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 Inteneity
No. (CFS) (min) (In/Hr)
.~ 1 119.236 34.39 1.766
2 77.947 25.48 2.082
Largest stream flow rias longer time of concentration
~. Qp = 119.236 + sum of
Qb ia/ib
77.947 + 0.848 = 66.102
~ Qp = 185.338
Total of 2 atreams to confluence:
~ Flow rates before confluence point: ~
'
~~
~
~
~
'~
r
~
~
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.
Bffective stream area after confluence = 115.400(Ac.)
IGG
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 122.000 to Point/Station 122.000
~**• CONFLURNCB 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)
Su~nary of stream data:
Stream Flow rate TC
No. (CPS) (mi.n)
1 1 185.459 39.08
2 185.338 34.39
Largest atream flow has longer
Qp = 1185.459 + sum of
Qb Ia/Ib
185.338 * 0.932 =
Qp = 1358.212
Rainfall Intensity
(In/Hr)
1.646
1.766
time of concentration
172.753
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
835.700(Ac.)
835.70 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Results of confluence:
Total flow rate = 1358.212(CFS)
Time of concentration = 39.080 min.
Bffective stream area after confluence
$nd of computations, total study area
Area averaged pervious area fraction(Ap) = 1.000
Area averaged RI index number = 79.3
~
' 200
'
r
i
~
~
~
~
t
~
~
~
~
r
~
~2
~ ~
' Zo(
~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDSSIGN Bngineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:264BX.out
~ ------------------------------------------------------------------------
TR 30264 fiXISTING CONDITION INCLUDING OFF-SITSS
lU0 YEAR STORM
~ JN 32006
------------------------------------------------------------------------
•**+***** Hydrology Study Control Infom~ation **********
~ Bnglieh (in-lb) Units used in input data file
Lohr & Associates, Inc., Temecula, CA - 5/N 773
~ Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Stoxm event (year) = 300.00 Antecedent Moisture Condition = 2
Standard inteneity-duration curves data (Plate D-4.1)
' For the [ Murrieta,Tmc,Rnch CaNOrco J area used.
10 year stozm 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 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 100.000 to Point/Station 101.000
~ ***+ INITIAL ARSA SVALUATION ****
Initial area flow distance = 1000.000(Ft.)
~ Top (of initial area) elevation = 1148.000(Ft.)
sottom (of initial area) elevation = 1130.3o0(Ft.>
Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1.77
1 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 stoxzn
~ 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 ~~
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
I 202
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
**** NATIJRAL CHANNSL TIMS + SUBARBA FLOW ADDZTION ****
~ Top of natural channel elevation = 1130.300(Ft.)
Snd of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
' Betimated 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 + S(q(8nglish Units3".352)(elope"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 500.0 year stoxm
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
**** NATIJRAL CHANNSL TIMB + SUBARBA 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.)
&stimated 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(Bnglieh 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 waterfalis (Plate D-6.2)
Nozmal channel slope = 0.0142
Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.87 min.
~
,
~
,
~
Adding area flow to channel
UNDBVBLOP~ (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
Rainfall intensity = 2.065(In/Hr) for
Subarea runoff = 27.039(CFS) for 17
Total runoff = 78.870(CFS) Total area
fraction = 0.000
3 100.0 year etorm
.200(Ac.)
= 46.200(AC.)
Zo3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
+'*** NAT[JRAL CHANNBL TIME + SUBARSP, 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.)
Estimated 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(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.
' Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.758
~ 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 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.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 107.000 to Point/Station 107.000
~ **+* CONFLUENCS OF MINOR STREAMS ***;
Along Main Stream number: 1 in noxmal stream number 1
~ Stream flow area = 46.700(Ac.)
Runoff from this stream = 79.629tCFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(In/Hr) ~~
~
'
M
~
~
~
~
[-J
,
~
~
,
~
'
Zo q.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+
Process from Point/Station 104.000 to Point/Station 105.000
***• INITIAL ARSA SVALUATION **+*
year stoxm
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 20.410(CFS)
Total initial etream area = 10.000(Ac.)
Pervious area fraction = 1.000
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
UNDEVPsLOPBD (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction eoil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procees from Point/Station 105.000 to Point/5tation 106.000
**** NATURAL CHANNSL TIMS + SUBARRA 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.)
Betimated 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(Snglieh 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)
Noxmal channel slope = 0.0145
Corrected/adjusted channel alope = 0.0145
Travel time = 4.75 min. TC = 21.81 min.
Adding area flow to channel
UNDBVBLOPSD (poor cover) aubarea
Runoff Coefficient = 0.772
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; Impervioua fraction
Rainfall intensity = 2.268(In/Hr) for a 100.0
Subarea runoff = 21.013(CFS) for 12.000(Ac.)
Total runoff = 41.423(CFS) Total area = 22
,
= 0.000
year stozm
000(AC.) ~
' Zo5
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 106.000 to Point/Station 107.000
**+* NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION ****
1 Top of natural channel elevation = 1116.000(Ft.)
End 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 formula for channel velocity:
Velocity(ft/s) _ (7 + 8{q{gnglieh Units)".352)(slope"0.5)
_ Velocity using mean channel flow = 4.91(Ft/s)
~ Correction to map elope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0160
~ Corrected/adjusted channel elope = 0.0160
Travel time = 4.28 mi.n. TC = 26.08 min.
~
~
~
,
~
~
,
Adding area flow to channel
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.761
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.056(In/Hr) for a 100.0 year etoLm
Subarea runoff = 14.857(CFS) for 9.500(Ac.)
Total runoff = 56.279(CFS) Total area = 31.500(AC.)
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) = 76.00
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
~*** CONFLUSNCB OF MINOR STR&AMS ****
Along Main Stream number: 1 in noxmal stream number 2
Stream flow area = 31.500(Ac.)
Runoff from this stream = 56.279(CFS)
Time of concentration = 26.08 min.
Rainfall inteneity = 2.056(In/Hr)
Summazy of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 79.629 27.36
2 56.279 26.08
L
argest stream flow has longer
~
= 79.629 + sum of
Qb Ia/ib
56.279 * 0.974 =
Qp = 134.443
2.002
2.056
time of concentration
54.815
^ Total of 2 streams to confluence: J~
~I
, 20~
Flow rates before confluence point:
79.629 56.279
1 Area of streams before confluence:
46.700 31.500
Results of confluence:
~ Total flow rate = 134.443(CFS)
Time of concentration = 27.365 min. 78.200(Ac.)
Sffective stream area after confluence =
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 110.000
' **** NATURAL CHANNBL TIME + SUBARSA FLOW ADDITION *t**
Top of natural channel elevation = 1095.800(Ft.)
~ $nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 910.000(Ft.)
Satimated mean flow rate at midpoint of channel = 143.899(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
~ Velocity ueing mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
,, Normal channel slope = 0.0091
Corrected/adjusted channel siope = 0.0091
Travel time = 3.00 min. TC = 30.36 mi.n.
Adding area flow to channel
~ UNDSVSLOPED (poor cover) subarea
Runoff Coefficient = 0.751
Decimal fraction soil group A= 0.000
, Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 1.891(In/Hr) for a 100.0 year storm
Subarea runoff = 15.614(CFS) for 11.000(AC.)
~ Total runoff = 150.057(CFS) Total area = 89.200(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUBNCS OF MINOR STR$AMS ****
~ 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(Zn/Hr)
, +++++++++++++++++++++++++++++~++++++++++++++++++++t+++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**+* INITIAL ARBA BVALUATION **** ~J,
, J~,
~ , 207
initial area flow diatance = 710.000(Ft.)
~ Top (of initial area) elevatioa = 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 intenaity = 2.639(In/Hr) for a 100.0 year stozm
~ UNDBVBLOPSD (poor cover) aubarea
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 m 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 CHANNSL TIMS + SUBARBA FLOW ADDITZON ****
~ Top of natural channel elevation = 1100.000(Ft.)
$nd of natural channel elevation = 1087.500(Ft.)
Length of natural channel = 1030.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 25.046(CPS)
~ Natural valley channel type used
L.A. County flood control diatrict foxmula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.51(Ft/s)
1 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
UNDEVSLOP~ (poor cover) subarea
Runoff Coefficient = 0.773
~ Decimal fraction soil group A= 0.000
Decimal fraction aoil 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
1 Subarea xunoff = 12.206(CFS) for 6.900(AC.)
Total runoff = 30.081(CFS) Total area = 15.500(Ac.)
j ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUBNCS OF MINOR STRSAMS **** ~
~
~ Along Main Stream aumber: 1 in normal stream number 2
Stream flow area = 15.500(Ac.)
~ Runoff from this stream = 30.081(CPS)
Time of concentration = 21.46 min.
Rainfall intenaity = 2.289(In/Hr)
~ Sutmnary of stream data:
Stream Flow rate TC Rainfall Intenaity
~ 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
Resulte of confluence:
~ Total flow rate = 174.910(CFS)
Time of concentration = 30.362 min.
Bffective stream area after confluence = 104.700(AC.)
~
,
~
~
~
,
~
Zo8
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~++++++++++
Process from Point/Station 110.000 to Point/Station 123.000
+*** NAT~TRAL CHANNSL TIMS + SUBARSA FLOW ADDITION ****
Top of natural channel elevation = 1087.500(Ft.)
Bnd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 675.000(Ft.)
Sstimated 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(Snglish 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)
Noxmal channel slope = 0.0059
Corrected/adjuated channel slope = 0.0059
Travel time = 2.53 min. TC = 32.89 mi.n.
Adding area flow to channel
UNDB~BLOPBD (poor cover) subarea
Runoff Coefficient = 0.745
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fractio~
group A = 0.000
group B = 1.000
group C = 0.000
group D = 0.000
2) = 78.00
i = 1.000; Impervious
fraction = 0.000 ~
, 209
Rainfall intensity = 1.809(In/Hr) for a 100.0 year stoxm
~ Subarea runoff = 23.997(CFS) for 17.800(Ac.)
Total runoff = 198.907(CFS) Total area = 122.500(AC.)
, +++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process fzom Point/Station 123.000 to Point/Station 123.000
**** CONFLU8NC8 OF MAIN STRSAMS ****
' The following data inside Main Stream is liated:
in Main Stream number: 1
Stream flow area = 122.500(Ac.)
' Runoff from this atream = 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 ARBA 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 inteneity = 2.821(In/Hr) for a 100.0 year etorm
_ UNDSVSLOPSD (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
' **** NATURAL CHANNSL TIMS + SUBAREA 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.)
Sstimated mean flow rate at midpoint of channel = 44.858(CFS)
' Natural valley channel type used
L.A. County flood control district fomiula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglieh Units)".352)(slope"0.5)
' Velocity using mean channel flom = 4.66(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalle (Plate D-6.2) (a~
~ Normal channel slope = 0.0154
,
~
~
'
,
~
~
,
~
'
Corrected/adjusted channel slope e 0.0154
Travel time = 2.90 min. TC = 17.56
Adding area flow to channel
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.807
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 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
Rainfall intensity = 2.555(In/Hr) for
Subarea runoff = 39.199(CFS) for 19
Total runoff = 62.203(CFS) Total area
min.
fraction = 0.000
a 100.0 year etorm
.000(AC.)
= 29.000(AC.)
210
+++++++++++++++++++++++++++++++++++++++t++++++++++++++++++++++++++++++
Process from Point/Station 113.000 to Point/Station 114.000
**** NATURAL CFiANNSL TIMS + SUBARRA PLOW ADDITI023 •***
Top of natural channel elevation = 1122.800(Ft.)
Snd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 82.580(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 = 4.75(Ft/s)
~ Correction to map slope used on extremely
drops and waterfalis (Plate D-6.2)
Normal channel slope = 0.0112
Adding area flow to channel
UND8V8LOPSD (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
Pervioue area fraction = 1.000; Impervious
Rainfall intensity = 2.301(In/Hr) for
Subarea runoff = 33.820(CFS) for 19
Total runoff = 96.023(CFS) Total area
~ Corrected/adjusted channel slope = 0.0112
Travel time = 3.68 min. TC = 21.25
~~
~
~
~
,
~
~
rugged channels with
min.
fraction = 0.000
a 100.0 year storm
.000(AC.)
= 48.000(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 114.000 to Point/Station 114.000
•*** CONFLUSNCB OF MINOR STRBAMS •***
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 48.000(Ac.) r~~
Runoff from this atream = 96.023(CFS) `~"
~ ZI1
Time of concentration = 21.25 min.
~ Rainfall intensity = 2.301(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Procesa from Point/Station 115.000 to Point/Station 115.000
**** USSR DBFINBD PLOW INFORMATION AT A POINT ****
~ Rainfall inteneity = 2.017(In/Hr) for a 100.0 year storm
UNDBVSLOPBD (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 = 27.00 min. Rain intensity = 2.02(In/Hr)
~ Total area = 469.20(AC.) Total runoff = 663.00(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 116.000
**** IMPROVSD CHANNBL TRAVBL TIMS ****
~ 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
' $stimated mean flow rate at midpoint of channel = 677.272(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 7.000(Ft.)
, Flow(q) thru aubarea = 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. 1 Critical depth = 3.531(Ft.)
' ' ' Critical flow top width = 34.719(Ft.)
~ ~ ' Critical flow velocity= 8.578(Ft/s)
~ ' ' Critical flow area = 78.957(Sq.Ft)
' Adding area flow to channel
UNDSVBLOPED (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 storm
Subarea runoff = 29.815(CFS) for 20.200(AC.) ~
Total runoff = 692.815(CFS) Total area = 489.400(Ac.)
,
1
2~z
++++++++++++++++++++~+++++++++++++++++++++++++++++++~+++++++++++++++++
~ Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUSNCS OF MINOR STRSAMS "'**
~ 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 = 1.88'7(In/Hr)
Summary of stream data:
' Stream Flow rate TC Rainfall Inteneity
No. (CFS) (min) (Zn/Hr)
' 1 96.023 21.25 2.301
2 692.815 30.46 1.887
' Largest atream flow has longer time of concentration
Qp = 692.815 + sum of
Qb Ia/Ib
96.023 * 0.820 = 78.765
, Qp = 771.580
Total of 2 streams to confluence:
~ Flow rates before confluence point:
96.023 692.815
Area of atreams before confluence:
48.000 489.400
/ Results of confluence:
Total flow rate = 771.580(CFS)
Time of concentration = 30.460 min.
' Effective stream area after confluence = 537.400(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 123.000
**** IMPROVSD CHANNSL TRAVBL TIMS +'***
, Upstream point elevation = 1106.500(Ft.)
Downstream point elevation = 3083.500(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 = 779.046(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 2.500(Ft.)
Flow(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. 1 Critical depth = 2.375(Ft.)
~ ' ' ' Critical flow top width = 65.375(Ft.)
~ ~ ' Critical flow velocity= 7.259(Ft/s)
~ ~ ~ Critical flow area = 107.320(Sq.Ft) ~~
'
, 213
Adding area flow to channel
, Ut~mSVSLOPBD (poor cover) aubarea
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 eoil(AMC 2) = 78.00
' Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall inteneity = 1.751(In/Hr) for a 100.0 year atoxm
Subarea runoff = 13.490(CFS) for 10.400(Ac.)
Total runoff = 785.070(CFS) Total area = 547.800(AC.)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 123.000 to Point/Station 123.000
**** CONFLUSNCB OF MAIN STRHAMS ****
' The following data inside Main Stream is liated:
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 DBFINSD FLOW INFORMATION AT A POINT ****
Rainfall inteneity = 2.617(In/Hr) for a 100.0 year stozm
, 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 epecified values are as followa:
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 CHANNSL TIMS + SUSARSA 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.)
, Bstimated 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:
~ Velocity(ft/s) _ (7 + 8(q(Snglish Units)".352)(slope"0.5)
Velocity ueing mean channel flow = 7.68(Ft/s) ~
, Correction to map slope used on extremely rugged channels with ~
___
Z~4
, 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
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 a 1.000; Impervious fraction = 0.000
' Rainfall intensity = 2.480(In/Hr) for a 100.0 year stoxm
Subarea runoff = 17.447(CFS) for 9.000(Ac.)
Total runoff = 146.447tCFS) Total area = 71.700(AC.)
, ++++++++++++++++++++++++++++++t+++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 121.000
' **** NATURAL CHANNSL TIMB + SiTBARBA PLOW ADDITION •***
Top of natural channel elevation = 1101.000(Ft.)
~ End 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 district fonnula 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 uaed on extremely xugged 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
' UNDEV$LOPBD (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 m 1.000; Impezvious 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
**** CONFLUSNCS OF MINOR STREAMS ***; ~n
' Along
number: 3 in normal stream number 1
, 215
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)
' +++++++++++++++++++++t~+++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 119.000 to Point/Station 120.000
, **** INITIAL ARSA SVALUATION ***+
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 stoxln
, SINGLS 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 atream area = 3.200(Ac.)
Pervious area fraction = 0.800
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNSL TIMB + SUBARSA FLOW ADDITION *+**
, Top of natural channel elevation = 1094.000(Ft.)
Bnd of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 9.520(CFS)
, Natural valley channel type uaed
L.A. County flood control diatrict foxmula for channel velocity:
, Velocity(ft/s) = t7 + 8(q(8ngliah Units)".352)(slope"0.5)
Velocity uaing 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
UNDSVSLOPSD (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
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.)
216
+++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
*~** CONFLLJENCB OF MINOR STRSAMS •***
Along Main Stream number: 3 in normal etream number 2
Stream flow area = 5.400(AC.)
Runoff from this stream = 11.545(CFS)
Time of concentration = 17.25 min.
Rainfall intenaity = 2.581(In/Hr)
Su~nary of stream data:
Stream Flow rate TC
No. (CFS) (min)
Rainfall Intenaity
(In/Hr)
1 163.439 21.44 2.290
2 11.545 17.25 2.581
Largest atream 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.
Bffective stream area after confluence = 86.700(Ac.)
+++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNSL TIMS + SUBARBA FLOW ADDITION ****
Top of natural channel elevation = 1090.500(Ft.)
find of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.)
Betimated 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($nglish 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.
'
Cv~
, Z~~
' 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) _ ~8.00
Pezvious area fraction = 1.000; Imperviou6 fraction = 0.000
Rainfall intenaity = 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.)
' +~+++++++++++++++++++++++++++++++++++++++t++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
**** NATURAL CHANNSL TIMB + SUBARBA FLOW ADDITION ****
' Top of natural channel elevation = 1087.100(Ft.)
8nd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
~ Bstimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type used
' L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bngiish 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
UNDEVSLOPSD (poor cover) subarea
Runoff Ccefficient = 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 stoxm
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
' **** CONFLUSNCS OF MAIN STRBAMS ****
The following data ineide 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. ~a
' Rainfall intensity = 1.839(In/Hr)
, Su~ary of stream data:
' Stream Flow rate TC
No. (CFS) (min)
'
,
~
'
,
'
,
u
LJ
'
'
~
'
,
'
'
1 198.907 32.89
2 785.070 34.92
3 217.127 31.94
Largest stream fl ow has longer
Qp = 785.~70 + sum of
Qb Ia/Ib
198.907 ~ 0.968 =
Qb Ia/Ib
217.127 + 0.952 =
Qp = 1184.275
Rainfall Inteneity
(in/Hr)
1.809
1.751 -
1.839
time of concentration
192.474
206.732
Total of 3 main streams to confluence:
Flow rates before confluence point:
198.907 785.070 217.127
Area of streame before confluence:
122.500 547.800 114.900
Results of confluence:
Total flow rate = 1184.275(CFS)
Time of concentration = 34.920 min.
Sffective stream area after confluence = 785.200(Ac.)
2~$
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 129.000
**** IMPROVSD CHANNSL TRAVEL TIMH •***
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
8stimated mean flow rate at midpoint of channel =
Manning's 'N' = 0.030
Maximum depth of channel = 10.000(Ft.)
Plow(q) thru subarea = 1186.915(CFS)
Depth of flow = 5.310(Ft.), Average velocity =
Channel flow top width = 25.238(Ft.)
Flow Velocity = 15.29(Ft/s)
Travel time = 0.99 min.
Time of concentration a 35.91 min.
Sub-Channel No. 1 Critical depth = 6.438(Ft.)
~ ~ ~ Critical flow top width =
' ' ' Critical flow velocity= 10
' ' ' Critical flow area = 108.
Adding area flosv to channel
UNDBVSIAPSD (poor cover) subarea
Runoff Coefficient = 0.739
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
1186.915(CFS)
15.291(Ft/e)
29.750(Ft.)
.926(Ft/8)
633(Sq.Ft)
~
1
'
,
,
,
'
1
z~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 500.0 year storm
Subarea runoff = 4.458(CFS) for 3.500(Ac.)
Total ruaoff = 1188.734(CFS) Total area = 788.700(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process fram Point/Station 129.000 to Point/Station 129.000
**** CONFLUSNCB OF MAIN STRBAMS ***•
The following data inside 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 intensity = 1.724(In/Hr)
Program is now starting with Main Stream No. 2
' +++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 119.000 to Point/Station 124.000
**** INITIAL ARBA BVALUATION •+'**
' Initial area flow dietance = 860.000(Ft.)
Top (of initial area) elevation = 1160.OOOiFt.)
' Bottom (of initial area) elevation = 1088.000(Ft.)
Difference in elevation = 72.OOOtFt.)
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
UNDSVSLOPSD (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 aubarea runoff = 7.724(CFS)
Total initial stream area = 3.200(AC.)
Pervious area fraction = 1.000
t ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
, **** IMPROVED CHANNBL TRAVSL TIMS ****
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
Sstimated mean flow rate at midpoint of channel = 8.690(CFS) -~~
Manning's 'N' = 0.030
' Maximum depth of channel = 1.000(Ft.)
,
r,
~~i
,
~
J
Flow(q) thru subarea = 8.690(CFS)
Depth of flow = 0.198(Ft.), Average
Channel flow top width = 18.384(Ft.)
Flow Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
Time of concentration = 15.60 min.
velocity =
Sub-Channel No. 1 Critical depth = 0.199(Ft
~ ' ' Critical flow top width =
~ ~ ~ Critical flow velocity=
~ ~ ' Critical flow area =
2.484(Ft/8)
18.395(Ft
2.465(Ft/s}
3.526(Sq.Ft)
, Adding area flow to channel
UNDBVSLOPSD (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; Impezvious fraction
Rainfall intenaity = 2.727(In/Hr) for a 100.0
' Subarea runoff = 1.725(CFS) for 0.800(AC.)
Total runoff = 9.450(CFS) Total area = 4
,
n
I'~
,
~
~
'
1
~
` JI
~
,
,
= 0.000
year atoxm
000(AC.)
ZZ o
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 125.000 to Point/Station 125.000
**** CONFLUSNCS OF MINOR STR8AM5 t***
Along Main Stream number: 2 in noxmal stream number 1
Stream flow area = 4.000(Ac.)
Runoff from this etream = 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
**** USBR DSFINBD PLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.104(In/Hr) for a 100.0 year storm
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
***t CONFLUBNC33 OF MINOR STREAMS **~* ,v
Along Main Stream number: 2 in nozmal stream number 2
,
Stream flow area = 118.000(Ac.)
Runoff from this etream = 293.200(CFS)
' Time of concentration = 25.00 min.
Rainfall intensity = 2.104(In/Hr)
Sutrnnaxy of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (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 + eum of
Qb Ia/Ib
9.450 • 0.772 = 7.292
~ Qp = 300.492
~ Total of 2 atreams 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.
~ Sffective stream area after confluence = 122.000(Ac.)
~2~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 125.000 to Point/Station 126.000
**** IMPROVED CHANNSL TRAVSL TIMB ***;
~
LJ
~
,
~
~
'
'
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
Bstimated mean flow rate at audpoint 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. i 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
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
' 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 = 137.200(Ac.)
~'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
,; Process from Point/Station 126.000 to PointJStation 127.000
•*+* ZMPROVSD CHANNSL TRAVBL TIMB ****
~ Upatream point elevation = 1073.700(Ft.)
Downstream point elevation = 1072.300(Pt.)
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
1 8stimated 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
UND$VSLOPBD (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 atoim
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
~ **+* ZMPROVSD CHANNBL TRAVBL TIMB **+*
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
Bstimated mean flow rate at midpoint of channel = 359.564(CPS)
Manning's 'N' = 0.030 `~Q,
' Maximum depth of channel = 6.000(Ft.)
~ ~ ~3
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)
~ Adding area flow to channel
UNDSVSLOPSD (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 100.0 year stoxm
~ Subarea runoff = 17.538(CFS) for 13.000(Ac.)
Total runoff = 362.376(CFS) Total area = 165.200(Ac.)
~ ++++++++++++++++++++++++++++++++~++++t++++++++++++++++++++++++++++++++
Process from Point/Station 128.000 to Point/Station 129.000
' **** ZMPROVBD CHANNBL TRAVSL TIMI3 **++
Upstream point elevation = 1068.900(Ft.)
Dovrnstream 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
Betimated 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.)
~ Plow 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
1 UNDSVSLOPBD (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 ~~
i Pervious area fraction = 1.000; Impervious fraction = 0.000
, ZZ~.
Rainfall intensity = 1.764(In/Hr) for a 100.0 year atozm
~ Subarea zvnoff = 18.324(CPS) for 14.000(AC.)
Total runoff = 380.700(CFS) Totai area = 179.200(AC.)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++t++++++++++
Process fram Point/Station 129.000 to Point/Station 129.000
;*** CONFLUSNCS OF MAIN STREAMS ****
~ The following data inside Main Stream is liated:
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 etarting with Main Stream No. 3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** US13R DSFINBD FLOW INFORMATION AT A POINT *+'**
' Rainfall intensity = 2.787(In/Hr) for a 100.0 year storm
CO1~Il~ISRCZAL subarea type
Runoff Coefficient = 0.875
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 index for soil(AMC 2) 56.00
Pervious area fraction = 0.100; Zmpervious frac[ion = 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)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 129.000 to Point/Station 129.000
*~~~ CONFLUSNCB OF MAIN STRSAMS ****
''
'
~
~
~
i
'
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 intensity = 2.787(InJHr)
Su~nary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 1188.734 35.91
2 380.700 34.44
3 108.000 15.00
Large st etream fl ow has longer
Qp = 1188.734 + sum of
Qb Za/Ib
380.700 * 0.977 =
Qb ia/Ib
1.724
1.764
2.787
time of concentration
372.013
~~
225
,
~~ I
~
~
~
~
,
~
,
~
~
~
~
~
~
108.000 * 0.619 = 66.817
Qp = 1627.564
Total of 3 main atreams to confluence:
Flom rates before confluence point:
1188.734 380.700 108.000
Area of streams before confluence:
788.700 179.200 87.000
Results of confluence:
Total flow rate = 1627.564(CFS)
Time of concentration = 35.912 min.
Sffective atream area after confluence = 1054.900(Ac.)
Snd of computations, total study area = 1054.90 (AC.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pezvious area fraction(Ap) = 0.840
Area averaged RI index number = 77.0
11
~
~ z~o
~
0
~
~
~
~
,
i
~
1
1
~~
0
!
' ~,g
~ 25~
Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDBSIGN Bngineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:798SX.out
' ------------------------------------------------------------------------
TR 29798 BXISTING CONDITION INCLUDING OFF-SITB (NO DSTSNTION)
100 YBAR STORM
~ JN 32006
------------------------------------------------------------------------
********* HydZ'olOgy Study COntI'ol InfOxmdtiOn ****~*+*+•
' 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(Zn/Hr)
' 100 year storm 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
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
~ **** INITIAL ARBA SVALUATION **t*
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 100.0 year atoxm
~ UNDSVELOPBD (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.)
' Pervioue area fraction = 1.000
I ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 101.000 to Point/Station 102.000
' **** NATURAL CHANNBL TIMB + SUBARBA FLOW ADDITION •***
' Top of natural channel elevation = 1067.500(Ft.)
Snd of natural channel elevation = 1055.700(Ft.)
Length of natural channel = 1255.000(Ft.)
' Sstimated 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 + 8(q(F3nglieh 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)
Noxmal channel slope = 0.0094
1 Corrected/adjusted channel slope = 0.0094
Travel time = 6.04 min. TC = 22.30 min.
' Adding area flow to channel
UNDSVSLOPBD (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
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 = 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.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 102.000 to Point/Station 103.000
1 **** NATURAL CHANNSL TIMB + SUBARSA 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.)
Eetimated mean flow rate at midpoint of channel = 66.102(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 = 1.83(Ft/s)
Correction to map slope used on extremely rugged channels wlth
' drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0019
Corrected/adjusted channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min. f~j
~
~
2y3
~ 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
Pervioua area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 2.073(In/Hr) for a 100.0 year etorm
' Subarea runoff = 30.012(CFS) for 19.000(AC.)
Total runoff = 78.324(CFS) Total area = 44.800(Ac.)
' ++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 103.000 to Point/Station 104.000
**** NATURAL CHANNBL TIME + SUSARfiA FLOW ADDITZON ****
, Top of natural channel elevation = 1055.000(Ft.)
Bnd of natural channel elevation = 1051.600(Ft.)
Length of natural channel = 720.000(Ft.)
' Bstimated mean flo~r rate at midpoint of channel = 94.059(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 = 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.
' Adding area flow to channel
UNDBVRLOPBD (poor cover) subarea
~ Runoff Coefficient = 0.753
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 intensity = 1.924(In/Hr) for a 100.0 year stoxm
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 CHANNSL TIME + SUBARSA FIAW ADDITION ****
Top of natural channel elevation = 1051.600(Ft.)
' $nd of natural channel elevation = 1050.600(Ft.)
Length of natural channel = 400.000(Ft.)
fistimated mean flow rate at midpoint of channel = 121.348(CFS)
' ~L
Natural valley channel type used
i Zy~
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unita)".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)
Nozmal channel slope = 0.0025
- Corrected/adjusted channel slope = 0.0025
' Travel time = 2.65 min. TC = 32.07 min.
Adding area flow to channel
' UNDSVSLOPBD (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 a 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.835(In/Hr) for a 100.0 year stozm
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
**** NATURP,L CHANNSL TIMS + SUBARSA 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.)
~ Sstimated mean flow rate at midpoint of channel = 149.367(CFS)
Natural valley channel type used
~ L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglieh Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.39(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2)
Nozmal channel slope = 0.0040
' Corrected/adjusted channel slope = 0.0040
Travel time = 3.20 min. TC = 35.27 snin.
I Adding area flow to channel
UNDBVBLOPSD (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.)
, ~v
~
'
~
,
'
'
'
~
'
'
~
~
~
'
~
'
~
,
'
Z55
++++++++++++++++++++++++++++++++++~+~+++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 106.000
*~** CONPLUBNCB OF MINOR STRBAMS •*+•
Along Main Stream number: 1 in nozmal stream number 1
Stream flom area = 104.600(AC.)
Runoff from this stream = 160.608(CFS)
Time of concentration = 35.27 min.
Rainfall inteneity = 1.741(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** USBR DSFINSD FLOW INFORMATION AT A POINT **~*
Rainfall intensity = 1.724(In/Hr) for a 100.0 year stozm
UND8v8LOPSD (poor cover) subarea
Runoff Coefficient = 0.768
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
RZ index for soil(AMC 2) = 81.76
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
TC = 35.91 min. Rain intensity = 1.72(In/Hr)
Total area = 1054.90(AC.) Total runoff = 1627.56(CFS)
+++++++++++++++++++++++++++++++t++++++t+++++++++++++++++++++++++++++++
Proceas from Point/Station 107.000 to Point/Station 108.000
**** IMPROVSD CHANNBL TRAVSL TIME3 *t+*
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
Bstimated mean flow rate at midpoint of channel =
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 =
Channel flow top width = 32.847(Ft.)
Flow Velocity = 12.42(Ft/s)
Travel time = 2.21 min.
Time of concentration = 38.13 min.
1636.817(CFS)
12.425(Ft/s)
Sub-Channel No. 1 Critical depth = 7.250(Ft.)
' ' ' Critical flow top width = 33.800(Ft.)
' ' ' Critical flow velocity= 11.578(Ft/s)
' ' ~ Critical flom area = 141.3'70(Sq.Ft)
Adding area flow to channel
UNDBVELOPBD (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
~~
256
, 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 = 1.668(In/Hr) for a 100.0 year atozm
Subarea runoff = 15.328(CFS) for 12.000(AC.)
, Total runoff = 1642.888(CFS) Total area = 1066.900(AC.)
' +++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 108.000
*~** CONFLUSNCB OF MINOR STREAMS ****
' Along Main Stream number: 1 in nozmal etream 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)
Sununary of stream data:
1 Stream Flow rate TC Rainfall Intenaity
No. (CFS) (min) (In/Hr)
'
1 160.608 35.27
2 1642.888 38.13
Large st 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
l~
,
~
~
L~I
'
'
~
'
,
153.873
Total of 2 etreams to confluence:
Flow rates before confluence point:
160.608 1642.888
Area of streams before confluence:
104.600 1066.900
Results of confluence:
Total flow rate = 1796.760tCFS)
Time of concentration = 38.125 min.
Sffective stream area after confluence = 1171.500(AC.)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++t
Process from Point/Station 108.000 to Point/Station 109.000
•*** IMPROVSD CHANNBL TRAVSL TIMB ****
Upstream point elevation = 1041.500(Ft.)
Downatream 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
Bstimated mean flow rate at midpoint of channel = 1810.564(CPS)
Manning'e 'N' = 0.015
Maximum depth of channel = 8.000(Ft.)
Flow(q) thru aubarea = 1810.564(CFS)
Depth of flow = 5.957(Ft.), Average velocity = 17.968(Ft/s)
Channel flow top width = 28.829(Ft.)
Flow VelOCity = 17.97(Ft/8) gj~
Travel time = 2.18 min.
, 27~
Time of concentration = 40.31 min.
1 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
, UNDEVSLOPSD (poor cover) aubarea
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/Hr) for a 100.0 year stoxm
Subarea runoff = 22.196(CFS) for 18.000(AC.)
, Total runoff = 1818.957(CFS) Total area = 1189.500(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 109.000 to Point/Station 109.000
**** CONFLUSNCB OF MAIN STR$AMS *~**
' The following data inaide 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 intensity = 1.618(In/Hr)
Program is now starting with Main Stream No. 2
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 110.000 to Point/Station 111.000
***~ INITIAL ARSA SVALUATION ****
initial area flom distance = 1000.000(Ft.)
~ Top (of initial area) elevation = 1058.000(Ft.)
sottom (of initial area) elevation = 1045.oo0(Ft.)
Difference in elevation = 13.000(Ft.)
' Siope = 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 atozm
UNDEVHLOPBD (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 eubarea runoff = 12.765(CFS)
Total initial stream area = 6.700(AC.)
~ Pervious area fraction = 1.000 ~s
' +++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++
, 25~
Proceas from Point/Station 111.000 to Point/Station 112.000
' ***+ NATURAL CHANNSL TIMB + SUBARBA 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.) 19.909(CFS)
Bstimated mean flow rate at midpoint of channel =
' 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 uaing mean channel flow = 2.73(Ft/s)
Correction to map slope used on extremely rugged channels with
drope and waterfalla (Plate D-6.2)
' Nora~al chanael slope = 0.0083
Corrected/adjusted channel slope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
' Adding area flow to channel
UNDEVSLOPSD (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/Ar) for a 100.0 year storm
Subarea runoff = 12.205(CFS) for 7.500(Ac.)
Total nu-off = 24.970(CFS) Total area = 14.200(Ac.)
'
+++++++++++++++++++++++++++++~++++++++++++++++++~+++++++++++++++++++++
' Process from Point/Station 112.000 to Point/Station 115.000
**** NATURAL CHANNSL TIM$ + SUBARBA FLOW ADDITION t***
Top of natural channel elevation = 1037.000(Ft.)
~ 8nd of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 560.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 27.783(CFS)
' Natural valley channel type used
L.A. County flood control district foimula for channel velocity:
' Velocity(ft/s) _ (7 + S(q(English Units)".352)(slope"0.5)
Velocity ueing mean channel flow = 2.63(Ft/s)
Correction to map slope used on extremely rugged channels with
' drops and waterfalle (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 flom to channel
UNDSVELOPSD (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
' Decimal fraction soil group B= 0.500
~
,
'
1
1
'
'
,
'
'
'
'
'
i
'
'
~
'
~
lJ
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
Pexvioue area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.924(In/Hr) for a 100.0 year etorm
Subarea runoff = 4.808(CFS) for 3.200(AC.)
Total runoff = 29.778(CFS) Total area = 17.400(Ac.)
25q
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLU8NC8 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)
++t+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 inteneity = 2.579(In/Hr) for a 100.0 year storni
UNDSVSLOPBD (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
RZ index for eoil(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.)
Pervioua area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++++++++++++
Proceas from Point/Station 114.000 to Point/Station 115.000
•*** NATURAL CHANNSL TIMB + SUBARIIA FLOW ADDITION ****
Top of natural channel elevation = 1047.000(Ft.)
Bnd of natural channel elevation = 1033.400(Ft.)
Length of natural channel = 1300.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 35.962(CFS)
Natural valley channel type ueed
L.A. County flood control district fonnula for channel velocity:
Velocity(ft/s) _ (9 + 8(q(Snglish Unite)".352)(slope"0.5)
Velocity using mean channel flow = 3.60(Ft/s) ~'~
Correction to map slope used on extremely rugged channels with
,
'
I~
'
,
u
'
u
'
CJ
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
UNDHVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.794
Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 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 runoff = 46.036(CFS) Total area = 24.500(Ac.)
2~0
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
***+ CONFLUSNCB OF MINOR STREAMS *tt*
Along Main Stream number: 2 in normal etream 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
' No. (CFS) (min)
Rainfall Intensity
(In/Hr)
1 29.778 29.43 1.924
' 2 46.036 23.28 2.188
Large st atream flow has longer or shorter time
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:
,
Area 29.778 46.036
of etreams before confluence:
17.400 24.500
Reaults of confluence:
' Total flow rate = 69.590(CFS)
Time of concentration = 23.277 min.
Sffective stream area after confluence
~
J
C
of concentration
41.900(AC.)
+++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 118.000
+'**t NATURAL CHANNSL TIME + SUBAR$A FLOW ADDITION ****
Top of natural channel elevation = 1033.400(Ft.)
Snd of natural channel elevation = 1030.500(Ft.) ~
, Length of natural channel = 730.000(Ft.)
' 8stimated mean flow rate at midpoint of channel = 71.251(CFS)
Natural valley channel type used
L.A. County flood control district fozmula for channel velocity:
, Velocity(ft/s) ~ (7 + 8(q(8nglieh 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.
z~~
' Adding area flow to channel
UNDHVHLOPSD (poor cover) eubarea
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 m 0.000
Rainfall intensity = 1.986(In/Hr) for a 100.0 year etoxm
, 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
**** CONFLUfiNCB OF MINOR STREAMS ****
, Along Main Stream number: 2 in nozmal 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
' t*** INITIAL ARBA SVALUATION *t**
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
Znitial area time of concentration = 20.483 min.
Rainfall inteneity = 2.348(In/Hr) for a 100.0 year storm
' UNDSt1SLOPSD (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 = 17.473(CFS)
Total initial stream area = 9.300(AC.)
Pexvious area fraction = 1.000
26 2
~+++++++++++++~++++++++++++++++++++++a++++++++++++++++++++++++++++++++
Procese from Point/Station 117.000 to Point/Station 118.000
**** NATURAL CHANNSL TSNIE + SUBARSA FIAW ADDITION ****
Top of natural channel elevation = 1042.300(Ft.)
Snd 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 formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Snglish Unite?".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)
Nornial channel slope = 0.0083
' Corrected/adjusted channel slope = 0.0083
Travel time = 7.79 min. TC = 28.27 min•
'
'
'
'
'
'
~
I_J
,
'
'
Adding area flow to channel
UNDBVSLOPBD (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; Zmpervious fraction = 0.000
Rainfall intensity = 1.966(In/Hr) for a 100.0 year atorm
Subarea runoff = 21.567(CFS) for 14.000(Ac.)
Total runoff = 39.040(CPS) Total area = 23.300(AC.)
+++++++++++++++++++++++~+++++++++++t++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 118.000
**** CONFLUBNCS 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 Inteneity
(In/Hr)
1.986
1.966
or shorter time of concentration
~
~
'
~I
'
,
'
'
'
,
J
u
,
,
~
,
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 etreams before confluence:
43.900 23.300
Reaults of confluence:
Total flow rate = 111.058(CFS)
Time of concentration = 29.775 min.
Bffective atream area after confluence = 67.200(Ac.)
26j
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 118.000 to Point/Station 122.000
*+'*• NATURAL CHANNSL TIMS + SUBARBA 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.)
$atimated 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(Snglieh IInits)".352)(slope"0.5)
Velocity using mean channel flow = 2.49(Ft/s)
Correction to map elope 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.
P,dding area flow to channel
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.772
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fractio
Rainfall intensity =
Subarea runoff =
Total runoff = 119.
group A = 0.000
group B = 0.500
group C = 0.500
group D = 0.000
2) = 82.00
n = 1.000; Iirtpervious fraction
1.766(In/Hr) for a 100.0
8.178(CFS) fOr 6.000(AC.)
236(CPS) Total area = 73
= 0.000
year storm
200lAC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
*+** CONFLUBNCB OF MINOR STRSAMS ****
' Along Nlain Stream number: 2 in noxmal 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)
' ~
'
'
'
'
'
'
'
~
'
'
'
Z6~
++++++++++++++++++++++++++++++++++++++++++~+++++++++++++++++++++++++~+
Process from Point/Station 119.000 to Point/Station 120.000
**** INITIAL ARBA SVALUATION ****
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 sipercent)= 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
UNDBVBIAPED (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.)
Pezvious area fraction = 1.000
+++++++++++++++++++++++++t+++++++++++++++~++++++++++++++++++++++++++++
Procesa from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNSL TIME + SUBARBA PLOW ADDZTION *+**
Top of natural channel elevation = 1045.500(Ft.)
Bnd of natural channel elevation = 1038.000(Ft.)
Length of natural channel = 870.000(Ft.)
8atimated mean flow rate at midpoint of channel = 38.188(CPS)
Natural valley channel type uaed
' 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 = 3.33(Ft/s)
' Correction to map slope uaed on e~ctremely rugged channels with
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0086
' Corrected/adjusted channel slope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
' Adding area flow to channel
UNDBVBLOPBD (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; Impezvious 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
~~
, 2~5
+++++++++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++++
' Process from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNSL TII~ + SUBARSA 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.)
Bstimated mean flow rate at midpoint of channel = 66.998(CPS)
' Natural valley channel type used
L.A. County flood control dietrict formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(8nglish Unita)".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 materfalls (Plate D-6.2)
Normal channel slope = 0.0088
Corrected/adjusted channei slope = 0.0088
, Travel time = 4.81 min. TC = 25.48 min.
Adding area flow to channel
, UNDSVBLOPED (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 etorm
Subarea runoff = 27.599(CFS3 for 16.800(AC.)
' TOtdl runoff = 77.947(CFS) Totdl area = 42.200(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceae from Point/Station 122.000 to Point/Station 122.000
**** CONFLUSNCS OF MINOR STREAMS ****
' Along Main Stream number: 2 in nozmal 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 2.082
' Largest stream flow hae 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 ratea before confluence point:
~~
' 2~G
119.236 '77.947
I~ Area of streams before confluence:
73.200 42.200
Results of confluence:
~ Total flow rate = 185.338(CFS)
Time of concentration = 34.390 min.
Sffective stream area after confluence = 115.400(AC.)
~~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
' **** CONFLUENCS OF MAIN STREAMS ****
The following data ineide 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 intensity = 1.766(In/Hr)
Su~nary of stream data:
' Stream Flow rate TC Rainfall Inteneity
No. (CPS) (min) (In/Hr)
~~' 1 1818.957 40.31 1.618
2 185.338 34.39 1.766
~ L~argest atream flow has longer time of concentration
1818.957 + sum of
Qb Ia/Ib
185.338 * 0.916 = 169.846
, QP = 1988.802
Total of 2 main streama to confluence:
~ Flow rates before confluence point:
1818.957 185.338
Area of streams before confluence:
1189.500 115.400
~
Resulta of confluence:
' Total flow rate = 1988.802(CFS)
Time of concentration = 40.305 min.
Sffective stream area after confluence = 1304.900(AC.)
1 ,
~ _
~
' 3nl
~ Riverside County Rational Hydrology Program
C.T.VILCADD/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
---------------------------
********* HydTOlOgy Study COritY01 InfOrmdtiOn **********
~' 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
V Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
~ For the
10 year [ Murrieta,Tmc,Rnch CaNOrco
stornt 10 minute intensity = ] area used.
2.360(In/Hr)
10 year stornt 60 minute intensity = 0.880(In/Ar)
100 year storm 10 minute intensity = 3.480(In/Hr)
~' 100 year storm 60 minute intensity = 1.300(In/Ar)
Storm event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Ar)
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
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
a5
1
~
~
~ Adding area flow to channel
~ UNDEVELO PED (poor cover) subarea
_ Runoff C oefficient = 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
I Subarea runoff = 27.039(CFS) for 17.200(AC.)
, ~ Total ru noff = 78.870(CFS) Total area = 46
- 0.000
year storm
200(AC.)
3a3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 forntula 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)
Noxmal channel slope = 0.0112
~ Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
,~
~
~
~
i
~,
,~
.1
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; Impenrious 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 norntal 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)
a~
~ 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 = 1133.000(Ft.)
Difference in elevation = 14.000(Ft.)
'i 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 stoxm
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 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
formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
_ Velocity using mean channel flow = 4.12(Ft/s)
i' 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
' Rainfall intensity = 2.268( In/Hr) for a 100.0
Subarea runoff = 21.013(CFS) for 12.000(AC.)
Total runoff = 41.423(CFS) Total area = 22
~
- 0.000
year storm
000(AC.) ~~
' 3n5
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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)
;~
,~
~
1
~
~
~
~
~
~.
~
Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nonnal 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; Impervious fraction
Rainfall intensity = 2.056(In/Hr) for a 100.0
Subarea runoff = 14.857(CFS) for 9.500(AC.)
Total runoff = 56.279(CFS) Total area = 31
= 0.000
year stozm
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 56.279 26.08
Largest stream flow has longer
Qp = 79.629 + sum of
Qb Ia/Ib
56.279 * 0.974 =
Qp = 134.443
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.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 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)
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
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
**** CONFLUENCfi 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)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA EVALUATION ****
~ ~~
~ 3~e
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.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 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)
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
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)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA EVALUATION ****
~ \b~
3°~
~ 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 stonn
~ 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 forniula for channel velocity:
' Velocity(ft/s) _ (7 + S(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)
Noxmal channel slope = 0.0121
Corrected/adjusted channel slope = 0.0121
~ Travel time = 4.89 min. TC = 21.46 min.
Adding area flow to channel
I UNDEVELO PED (poor cover) subarea
Runoff C oefficient = 0.773
~ Decimal
Decimal fraction soil
fraction soil group A=
group B= 0.000
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 ru noff = 30 .081(CFS) Total area = 15.500(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 110.000
**** CONFLUENCE OF MINOR STREAMS ****
~ lOI
LJ
~
~'
~~
~
~
~~,
lJ
~
~
~
~
~
i
~
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 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.)
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 fornrula 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 min.
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
GOZ
3a~
~ Rainfall intensity = 1.809(In/Hr) for a 100.0 year stoxin
~ 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
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 ****
~ Initial area flow distance = 500.000(Ft.)
Top (of initial area) elevation = 1143.000(Ft.)
Bottom (of initial area) elevation = 1135.3o0(Ft.)
, Difference in elevation = 7.700(Ft.)
Slope = 0.01540 s(percent)= 1.54
TC = k(0.530)*[(length"3)/(elevation change)7~0.2
~ 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
~ 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
**** 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 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 ~b3
~ 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
E 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.)
31d
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 fonnula 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)
Norntal 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.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
- 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) ~f~
J r~
~ Time of concentration = 21.25 min.
~ Rainfall intensity = 2.301(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ 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 storm
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 CFIANNEL TRAVEL 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 = 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 = 7.840(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
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; Impexvious fraction = 0.000
Rainfall intensity = 1.874(In/Iir) 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.) ~Os.
,
~ 312
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 116.000 to Point/Station 116.000
**** CONFLUENCE 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 Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 96.023 21.25 2.301
2 353.570 30.87 1.874
~ Largest 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 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 ****
i
1
~
'
,
~
'
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 min.
439.634(CFS)
6.268(Ft/s)
Sub-Channel No. 1 Critical depth = 1.734(Ft.)
' ' ' Critical £ibw top width = 54.484(Ft.)
' ' ' Critical f~bw velocity= 6.378(Ft/s)
' ' ' Critical f1`x5w area = 68.928(Sq.Ft)
~C~
/ ~ !3
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 = 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.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, 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 INFORMATION AT A POINT ****
Rainfall intensity = 2.617(In/Hr) for a 100.0 year stornt
~ 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 Praction = 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 foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Units)".352)(slope"0.5)
Velocity using mean channel flow = 7.68(Ft/s)
, Correction to map slope used on extremely rugged channels with ~p~,
~ 3(~
drops and waterfalls (Plate D-6.2)
, Nozmal 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 stoxin
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 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 = 2.290(In/Hr) for a 100.0 year storm
Subarea runoff = 16.992(CFS) for 9.600(Ac.)
I 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 nozmal stream number 1 ~~
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 stoxm
~ 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
1 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
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 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 + S(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)
Nozmal channel slope = 0.0063
Corrected/adjusted channel slope = 0.0063
' Travel time = 4.78 min. TC = 17.25 min.
, Adding area flow to channel
UNDE\IELOPED (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 ~-y~
, RI index for soil(AMC 2) = 78.00 {~v~
~
,
~
~
'
r
~
'
'
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.581(In/Hr) for a 100.0 year stornt
Subarea runoff = 4.460(CFS) for 2.200(Ac.)
Total runoff = 11.545(CFS) Total area = 5.400(Ac.)
3 ~6
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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
No. (CFS) (min)
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
Rainfall Intensity
(In/Hr)
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 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 =
,
IJ
~
~
~
,
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)
Normal channel slope = 0.0046
Corrected/adjusted channel slope = 0.0046
Travel time = 3.14 min. TC = 24.58 min.
\~O
~
~ 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 stonn
' Subarea runoff = 30.531(CFS) for 18.800(AC.)
Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
='7
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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)
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 storm
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
I, **** 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/Ar)
~ Summary of stream data:
, Stream Flow rate TC
No. (CFS) (min)
~
'
~
I
u
i
,
'
1 198.907 32.89
2 444.963 36.10
3 217.127 31.94
Largest stream fl ow 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
. Ip
Results of confluence:
' Total flow rate = 836.913(CFS)
Time of concentration = 36.105 min.
Effective stream area after confluence = 533.000(Ac.)
' ++++++++++++i~++~F+++i++i++++++++++++++++++++++++++~-+t+t++i
Process from Point/Station 123.000 to Point/Station
~ **** IMPROVED CHANNEL 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 =
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/S)
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
~~~
~ 39
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 stoztn
' 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:
Zn 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
I 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.OQ0 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 = 8.690(CFS)
Manning~s 'N' = 0.030 `t3
, Maximum depth of channel = 1.000(Ft.)
~ J_'o
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.)
t ' ' ' 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
'I , 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.)
ii ' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 ****
l1~
~ Along Main Stream number: 2 in normal stream number 2
'
~1
~
'
,
,
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
Largest stream flow has longer
Qp = 293.200 + sum of
Qb Za/Ib
9.450 * 0.772 =
Qp = 300.492
Rainfall Intensity
(In/Hr)
2.727
2.104
time of concentration
7.292
, Total
Flow of 2 streams to confluence:
rates before confluence point:
9.450 293.200
Area of streams before confluence:
' 4.000 118.000
Resul ts of confluence:
Total flow rate = 300.492(CFS)
Time of concentration = 25.000 min.
' Effec tive stream area after confluence = 122.000(Ac.)
z~~
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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.
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
`~ J~
, Decimal fraction soil group D= 0.000 ~z
, 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 =
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 =
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
' Travel time = 2.47 min.
Time of concentration = 30.08 min.
341.099(CFS)
3.976(Ft/s)
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
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 stonn
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 = 359.564(CFS)
Manning's 'N' = 0.030 ~~6
Maximum depth of channel = 6.000(Ft.)
, ~ ~3
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)
, 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/Hr) for a 100.0 year stornt
' 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
I' ' **** 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
, Rainfall intensity
' Subarea runoff =
Total runoff =
= 1.764(In/Hr)
18.324(CFS) for
380.700(CFS) Total
for a 100.0
14.000(Ac.)
area = 179
year storm
200(AC.)
J ~~
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUENCE OF MAIN STREAMS ****
L__l
,
'
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 ****
'
'
,
,
'
'
C'
,
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 = 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
' 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/xr)
1.691
1.764
2.787
time of concentration
364.944
~~~
, 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
'
'
,
'
'
I'~ 1
'
'
1
325
~~9
, 350
'
,
'
'
1
'
'
'
~
'
1
'
'
'
1
'
'
' ~Z~
, 3 51
~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:798BEX.out
^f ------------------------------------------------------------------------
TR 29798 EXISTING CONDITION INCLUDING OFF-SITES DETAINED
100 YEAR STORM
'' JN 32006
------------------------------------------------------------------------
******~~~ HydrOlOgy Study COIItr01 InfOrntdtiOn **********
' English (in-lb) Units used in input data file
I ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
' Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Storn1 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 stozm 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
'
~
~
~
~
~
LJ
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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
0 year storm
Pervious area fraction = 1.000; Impervious fraction = 0.000
~~
~ 352
Initial subarea runoff = 21.029(CFS)
~ Total initial stream area = 10.000(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
I ~
Process from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
i~. 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
1 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
drops and waterfalls (Plate D-6.2)
Noxznal 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 stornt
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 forntula for channel velocity:
Velocity(ft/s) _ (7 + S(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)
Normal channel slope = 0.0019
Corrected/adjusted channel slope = 0.0019
Travel time = 3.38 min. TC = 25.68 min.
~~
~ 353
I~ Adding area flow to channel
UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.762
Decimal fraction soil group A= 0.000
II ~ 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
i Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.073(In/Hr) for a 100.0 year storm
~ 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 CHANNEL TIME + SUBAREA FLOW ADDITION ****
I~ 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 + S(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
1~
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
UNDEVELOPED (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 ~~
35~
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 = 2.52(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 + 8(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)
Normal 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
1~ RI index for soil(AMC 2) = 80.40
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.741(In/Ar) for a 100.0 year storm
' Subarea runoff = 28.261(CFS) for 21.400(Ac.)
I Total runoff = 160.608(CFS) Total area = 104.600(Ac.)
~`
~~
, ~ 355
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 106.000
~ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal 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 ****
,s 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)
1~
' ' '
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
~!~
~ 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 = 1.635(In/Hr) for a 100.0 year storm
, Subarea runoff = 14.978(CFS) for 12.000(AC.)
Total runoff = 1286.738(CFS) Total area = 814.700(Ac.)
~`
35~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~~ Process from Point/Station 108.000 to Point/Station 108.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal 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 1.741
2 1286.738 39.54 1.635
Large st stream flow has longer time of concentration
~ Qp = 1286.738 + sum of
Qb Ia/Ib
Qp = 160.608 * 0.939 = 150.818
1437.556
~ Total of 2 streams to confluence:
Flow rates before confluence point:
160.608 1286.738
" Area of streams before confluence:
~~
Resul 104.600 814.700
ts of confluence:
Total flow rate = 1437.556(CFS)
Time of concentration = 39.541 min.
,~
~ Effec tive stream area after confluence = 919.300(AC.)
,
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, i Process from Point/Station 108.000 to Point/Station 109.000
**** ZMPROVED CHANNEL TRAVEL TIME ****
,~
~
a
~.
,~
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)
~~
3s7
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
RZ index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.585(In/xr) 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.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 109.000 to Point/Station 109.000
:~, **** CONFLUENCE OF MAIN STREAMS ****
- The following data inside Main Stream is listed:
~F In Main Stream number: 1
I 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 EVALUATION ****
~
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.)
;i 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
t 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
•L
~2~
_^.
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~.
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 formula 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
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 = 2.065(In/Hr) for a 100.0 year storm
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 CHANNEL TIME + 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"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)
Nornial 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) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000 ~
Decimal fraction soil group B= 0.500
~ Decimal fraction soil
Decimal fraction soil
RI index for soillAMC
~' Pervious area fractio
~ Rainfall intensity =
Subarea runoff =
~!~ Total runoff = 29.
group C = 0.500
group D = 0.000
2) = 82.00
n = 1.000; Impervious fraction
1.924(In/Hr) for a 100.0
4.808(CFS) for 3.200(Ac.)
778(CFS) Total area = 17
= 0.000
year stozm
400(AC.)
?5~
~, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
Stream flow area = 17
Runoff from this stream =
Time of concentration =
Rainfall intensity =
2 in normal stream number 1
400(AC.)
29.778(CFS)
29.43 min.
.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.
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
0 year storm
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 fornlula 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 1~
3~v
drops and waterfalls (Plate D-6.2)
Noxmal 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 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 = 2.188(In/Hr) for a 100.0
Subarea runoff = 25.189(CFS) for 14.500(Ac.)
Total runoff = 46.036(CFS) Total area = 24
= 0.000
year storm
500(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 115.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number:
Stream flow area = 24
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
2 in norntal stream number 2
.500(AC.)
46.036(CFS)
23.28 min.
2.188(In/Hr)
Stream Flow rate TC
~: No. (CFS) (min)
~
I'
~
~~
~'
~
Rainfall Intensity
(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.
Effective stream area after confluence = 41.900(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 115.000 to Point/Station 118.000
**** NA`I'tTRAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1033.400(Ft.)
End of natural channel elevation = 1030.500(Ft.)
~~
~ 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 fonnula 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; Zmpervious fraction = 0.000
Rainfall intensity = 1.986(In/Hr) for a 100.0 year stornt
~ 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
I **** CONFLUENCE OF MINOR STREAMS ****
3~1
118.000
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.)
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.
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
0 year storm
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
~3~
~ Initial subarea runoff =
II ~ Total initial stream area
Pervious area fraction = 1
17.473(CFS)
= 9.300(AC.)
.000
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 fonnula 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.
~ Adding area flow to channel
UNDEVELOPED (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 stornt
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
~ **** CONFLUENCE OF MINOR STREAMS ****
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)
~ Summaxy of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (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 13Z
3c3
' ~ 39.040 * 0.982 = 38.353
I ~ Qp = 111.058
Total of 2 streams to confluence:
Flow rates before confluence point:
I ~ 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.)
~,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 118.000 to Point/Station 122.000
III ~ **** NATURAL CHANNEL TIME + SUBAREA 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.)
Estimated mean flow rate at midpoint of channel = 116.016(CFS)
~ Natural valley channel type used
L.A. County flood control district foxznula 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
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 = 8.178(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)
, f 33
~ 3ca
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ 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)]"0.2
Initial area time of concentration = 16.313 min.
Rainfall intensity = 2.661(In/Hr) for a 100.0 year storm
~ UNDEVELOPED (poor cover) subarea
Runoff Coefficient = 0.811
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
,t- 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 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
1 Corrected/adjusted channel slope = 0.0086
Travel time = 4.36 min. TC = 20.67 min.
I 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.)
~ ~34.
~~
~
'~
~'
~
~
~
~
,'
3~5
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 121.000 to Point/Station 122.000
+~** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
Top of natural channel elevation = 1038.000(Ft.)
End of natural channel elevation = 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)
1 119.236 34.39
2 77.947 25.48
Largest stream flow has longer
Qp = 119.236 + sum of
Qb Ia/Ib
77.947 * 0.848 =
Qp = 185.338
1.766
2.082
time of concentration
66.102
Total of 2 streams to confluence:
'
Flow
rates
before ~3~
confluence point:
3G~
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 ****
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:
The following data inside Main Stream is listed:
In Main Stream number: 2
Stream Flow rate TC
~' No. ~ (CFS) (min)
~
1 1 459.230 41.85
~ 2 185.338 34.39
Largest stream flow has longer
Qp = 1459.230 + sum of
~ Qb Ia/Ib
185.338 * 0.898 =
Qp = 1625.607
~
~
~
~
Rainfall Intensity
(In/Hr)
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
The following figures may
be used for a unit hydrograph study of the same area.
Results of confluence:
Total flow rate = 1625.607(CFS)
Time of concentration = 41.846 min.
Effective stream area after confluence = 1052.700(AC.)
End of computations, total study area = 1052.70 (Ac.)
Area averaged pervious area fraction(Ap) = 1.000
Area averaged RI index number = 81.5
~ ~3~
' ~ Qn~
i~ Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
' Rational Hydrology Study Date: O1/23/03 File:305BCH.out
~ ------------------------------------------------------------------------
TR 29798 (NORTH HALF) & TR 30264 (SOUTH HALF) DEVELOPED (NO OFF-SITES)
100 YEAR STORM
JN 32006
~- ~
------------------------------------------------------------------------
********* HydZ'ology Study COnti01 InforntHtiOn **********
~ 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,'Itnc, Rnch CaNorco ] area used.
~
10 year storm 10 minute intensity = 2.360(In/Hr)
• 10 year stoxm 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)
Stonn event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(Zn/Hr)
Slope of intensity duration curve = 0.5500
,,
~
~
~
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 80.000 to Point/Station 81.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 127.80o(Ft.)
Bottom (of initial area) elevation = 113.60o(Ft.)
Difference in elevation = 14.200(Ft.)
Slope = 0.01420 s(percent)= 1.42
TC = k(0.940)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 34.888 min.
Rainfall intensity = 1.752(In/Hr) for a 100.
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.605
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
0 year stonn
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
~31
402
Initial subarea runoff = 3.287(CFS)
Total initial stream area = 3.100(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 81.000 to Point/Station 81.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in noxmal stream number 1
Stream flow area = 3.100(AC.)
Runoff from this stream = 3.287(CFS)
Time of concentration = 34.89 min.
Rainfall intensity = 1.752(In/Hr)
Process from Point/Station 1.020 to Point/Station 1.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.675(In/Hr) for a 100.0 year storm
UNDEVELOPED (fair cover) subarea
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
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 74.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
TC = 16.16 min. Rain intensity = 2.67(In/Hr)
Total area = 40.85(Ac.) Total runoff = 81.50(CFS)
~ Process from Point/Station 1.020 to Point/Station 1.020
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
~ Stream flow area = 40.850(AC.)
Runoff from this stream = 81.500(CFS)
Time of concentration = 16.16 min.
~ Rainfall intensity = 2.675(In/Ar)
Summary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
~ 1 3.287 34.89 1.752
~ 2 81.500 16.16 2.675
Largest stream flow has longer or shorter time of concentration
, Qp = 81.500 + sum of
Qa Tb/Ta
3.287 * 0.463 = 1.523
1 Qp = 83.023
Total of 2 streams to confluence:
Flow rates before confluence point:
~ 3.287 81.500 ~~J~j
,
Area of streams before
3.100 40
~ Results of confluence:
Total flow rate =
Time of concentration
'' , Effective stream area
confluence:
850
83.023(CFS)
= 16.160 min.
after confluence = 43.950(AC.)
4o j
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 81.000 to Point/Station 82.000
- **** IMPROVED CHANNEL TRAVEL TIME ****
~ Upstream point elevation = 113.200(Ft.)
Downstream point elevation = 102.800(Ft.)
Channel length thru subarea = 890.000(Ft.)
Channel base width = 38.000(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 = 85.478(CFS)
_
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 85.478(CFS)
~ Depth of flow = 0.564(Ft.), Average velocity = 3.767(Ft/s)
Channel flow top width = 42.510(Ft.)
Flow Velocity = 3.77(Ft/s)
Travel time = 3.94 min.
~ Time of concentration = 20.10 min.
Sub-Channel No. 1 Critical depth = 0.531(F t.)
~ ' ' Critical flow top width = 42.250(Ft.)
' ~ ~ ~ Critical flow velocity= 4.010(Ft/s)
,. ~ ~ ~ Critical flow area = 21.316(Sq.Ft)
~
~
~
~
1
~
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.662
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 = 2.372(In/Hr) for a 100.0 year stonn
Subarea runoff = 4.084(CFS) for 2.600(AC.)
Total runoff = 87.107(CFS) Total area = 46.550(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 82.000 to Point/Station 82.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in norntal stream number 1
Stream flow area = 46.550(Ac.)
Runoff from this stream = 87.107(CFS)
Time of concentration = 20.10 min.
Rainfall intensity = 2.372(In/Hr)
~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.010 to Point/Station 2.010
'
~
~
'
~
~
,
,
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.581(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
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) = 62.50
Pexvious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 17.24 min. Rain intensity = 2.58(In/Hr)
Total area = 27.00(AC.) Total runoff = 59.45(CFS)
40~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.010 to Point/Station 2.010
**** CONFLUENCE OF MZNOR STREAMS ****
Along Main Stream number:
Stream flow area = 27
Runoff from this stream =
Time of concentration =
Rainfall intensity =
Summary of stream data:
1 in normal stream number 2
.000(Ac.)
59.450(CFS)
17.24 min.
2.581(In/Hr)
Stream Flow rate TC
No. (CFS) (min)
1
~ 2
Largest
4P =
~ 4P =
87.107 20.10
59.450 17.24
stream flow has longer
87.107 + sum of
Qb Ia/Ib
59.450 * 0.919 =
141.747
Rainfall Intensity
(In/Hr)
2.372
2.581
time of concentration
54.641
~ Total of 2 streams to confluence:
Flow rates before confluence point:
87.107 59.450
Area of streams before confluence:
~ 46.550 27.000
-' Results of confluence:
~ Total flow rate = 141.747(CFS)
Time of concentration = 20.098 min.
Effective stream area after confluence =
~
~
73.550(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 82.000 to Point/Station 83.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 102.800(Ft.)
Downstream point elevation = 79.200(Ft.)
Channel length thru subarea = 1360.000(Ft.)
Channel base width = 38.000(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 = 145.602(CFS)
Manning's 'N' = 0.028
1 Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 145.602(CFS)
Depth of flow = 0.687(Ft.), Average velocity = 5.199(Ft/s)
, Channel flow top width = 43.498(Ft.)
Flow Velocity = 5.20(Ft/s)
Travel time = 4.36 min.
~ Time of concentration = 24.46 min.
Sub-Channel No. 1 Critical depth = 0.750(Ft.)
' ' ' Critical flow top width = 44.000(Ft.)
~ ' ' ' Critical flow velocity= 4.735(Ft/s)
' ' ' Critical flow area = 30.750(Sq.Ft)
, Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.643
~ 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 = 2.130(In/Hr) for a 100.0 year stoxm
1 Subarea runoff = 5.475(CFS) for 4.000(AC.)
Total runoff = 147.223(CFS) Total area = 77.550(AC.)
405
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 83.000 to Point/Station 83.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 1
" Stream flow area = 77.550(AC.)
~ Runoff from this stream = 147.223(CFS)
Time of concentration = 24.46 min.
• Rainfall intensity = 2.130(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.040 to Point/Station 2.040
~ **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.382(In/Hr) for a 100.0 year storm
~ SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.763
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; Zmpervious fraction = 0.500
User specified values are as follows:
- TC = 19.95 min. Rain intensity = 2.38(In/Hr)
Total area = 30.90(AC.) Total runoff = 59.63(CFS)
~ ~~~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 2.040 to Point/Station 2.040
I~ **** CONFLUENCE OF MINOR STREAMS ****
I %
'
~
~
~
r
~
'
4 ~G
Along Main Stream number: 1 in norntal stream number 2
Stream flow area = 30.900(AC.)
Runoff from this stream = 59.630(CFS)
Time of concentration = 19.95 min.
Rainfall intensity = 2.382(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 147.223 24.46
2 59.630 19.95
Largest stream fl ow has longer
Qp = 147.223 + sum of
Qb Ia/Ib
59.630 * 0.894 =
Qp = 200.532
2.130
2.382
time of concentration
53.310
Total of 2 streams to confluence:
Flow rates before confluence point:
147.223 59.630
Area of streams before confluence:
77.550 30.900
Results of confluence:
Total flow rate = 200.532(CFS)
Time of concentration = 24.457 min.
Effective stream area after confluence =
108.450(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 83.000 to Point/Station 84.000
**** IMPROVED CHANNEL TRAVEL TIME ****
,
~
~
~
~
~
Upstream point elevation = 79.200(Ft.)
Downstream point elevation = 59.600(Ft.)
Channel length thru subarea = 1300.000(Ft.)
Channel base width = 38.000(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 = 204.138(CFS)
Depth of flow = 0.874(Ft.), Average velocity =
Channel flow top width = 44.994(Ft.)
Flow Velocity = 5.63(Ft/s)
Travel time = 3.85 min.
Time of concentration = 28.31 min.
204.138(CFS)
5.627(Ft/s)
Sub-Channel No. 1 Critical depth = 0.938(Ft.)
' ' ' Critical flow top width = 45.500(Ft
' ' ' Critical flow velocity= 5.216(Ft/s)
' ' ' Critieal flow area = 39.141(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.628
~Z
~
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; Impexvious fraction
, Rainfall intensity = 1.965( In/Hr) for a 100.0
Subarea runoff = 4.811(CFS) for 3.900(AC.)
, Total ru noff = 205. 343(CFS) Total area = 112
= 0.000
year storm
350(Ac.)
40~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 84.000 to Point/Station 84.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 112.350(Ac.)
Runoff from this stream = 205.343(CFS)
Time of concentration = 28.31 min.
Rainfall intensity = 1.965(In/Hr)
'
,
~
1
~
~
~
~
~
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.050 to Point/Station 2.050
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.817(In/Hr) for a 100.0 year storni
APARTMENT subarea type
Runoff Coefficient = 0.851
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) = 56.00
Pervious area fraction = 0.200; Impervious fraction = 0.800
User specified values are as follows:
TC = 14.71 min. Rain intensity = 2.82(In/Hr)
Total area = 19.10(AC.) Total runoff = 47.36(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.050 to Point/Station 2.050
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 19.100(Ac.)
Runoff from this stream = 47.360(CFS)
Time of concentration = 14.71 min.
Rainfall intensity = 2.817(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 205.343 28.31 1.965
2 47.360 14.71 2.817
Largest stream flow has longer time of concentration
Qp = 205.343 + sum of
Qb Ia/Ib
Rainfall Intensity
(In/Hr)
~3
'
47.360 * 0.698 = 33.041
Qp = 238.384
1
Total of 2 streams to confluence:
Flow rates before confluence point:
205.343 47.360
~ Area of streams before confluence:
112.350 19.100
, Resul
Total ts of confluence:
flow rate = 238.384(CFS)
Time of concentration = 28.308 min.
Effec tive stream area after confluence =
,
~~
~
~
,
1
~
'
~
'
~
r
131.450(AC.)
408
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 131.450(AC.)
Runoff from this stream = 238.384(CFS)
Time of concentration = 28.31 min.
Rainfall intensity = 1.965(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1202.000 to Point/Station 1202.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
TC = 15.00 min. Rain intensity = 2.79(In/Hr)
Total area = 93.62(AC.) Total runoff = 114.63(CFS)
Rainfall intensity = 2.787(In/Hr) for a 100.0 year stozm
COI~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:
Process from Point/Station 1202.000 to Point/Station
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nornlal stream number 2
Stream flow area = 93.620(AC.)
Runoff from this stream = 114.630(CFS)
Time of concentration = 15.00 min.
Rainfall intensity = 2.787(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 238.384 28.31 1.965
2 114.630 15.00 2.787
1202.000
Y'~
, Largest stream flow has longer time of concentration
' Qp = 238.384 + sum of
Qb Ia/Ib
114.630 * 0.705 = 80.835
Qp = 319.219
~ Total of 2 streams to confluence:
Flow rates before confluence point:
, 238.384 114.630
Area of streams before confluence:
131.450 93.620
Results of confluence:
~ Total flow rate = 319.219(CFS)
Time of concentration = 28.308 min.
Effective stream area after confluence = 225.070(Ac.)
~
40~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 84.000 to Point/Station 84.000
**** CONFLUENCE OF MZNOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
' Stream flow area = 225.070(Ac.)
Runoff from this stream = 319.219(CFS)
Time of concentration = 28.31 min.
~ Rainfall intensity = 1.965(In/Hr)
i ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 4.080 to Point/Station 4.080
**** USER DEFINED FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 2.230(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= 0.500
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 = 22.49 min. Rain intensity = 2.23(In/Hr)
Total area = 507.92(Ac.) Total runoff = 697.32(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
PrOCess from Point/Station 4.080 to Point/Station 4.080
**** CONFLUENCE OF MINOR STREAMS ****
~
'
~
,
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 507.920(AC.)
Runoff from this stream = 697.320(CFS)
Time of concentration = 22.49 min.
Rainfall intensity = 2.230(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity /
No. (CFS) (min) (In/Hr) m~
it
1 319.219 28.31
~ 2 697.320 22.49
Largest stream flow has longer
Qp = 697.320 + sum of
Qa Tb/Ta
~ 319.219 * 0.794 =
Qp = 950.933
1.965
2.230
or shorter time
253.613
of concentration
, Total of 2 streams to confluence:
Flow rates before confluence point:
319.219 697.320
' Area of streams before confluence:
225.070 507.920
Results of confluence:
~ Total flow rate = 950.933(CFS)
Time of concentration = 22.490 min.
Effective stream area after confluence = 732.990(AC.)
~ro
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 85.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 59.000(Ft.)
Downstream point elevation = 53.100(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 = 952.017(CFS)
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 952.017(CFS)
Depth of flow = 2.334(Ft.), Average velocity = 8.266(Ft/s)
Channel flow top width = 58.675(Ft.)
Flow Velocity = 8.27(Ft/s)
Travel time = 1.19 min.
Time of concentration = 23.68 min.
Sub-Channel No. 1 Critical depth = 2.391(Ft.)
' ' ' Critical flow top width = 59.125(Ft
' ' ' Critical flow velocity= 8.035(Ft/s)
' ' ' Critical flow area = 118.485(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.646
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 = 2.168(In/Hr) for a 100.0 year stortn
Subarea runoff = 2.339(CFS) for 1.670(AC.)
Total runoff = 953.272(CFS) Total area = 734.660(AC.)
\~~P
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, 4!I
Process from Point/Station 85.000 to Point/Station 85.000
, *~** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 734.660(Ac.)
Runoff from this stream = 953.272(CFS)
, Time of concentration = 23.68 min.
Rainfall intensity = 2.168(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
' 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)
1 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 normal 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)
~ 1 953.272 23.68 2.168
2 21.500 11.62 3.207
~ Largest stream flow has longer time of concentration
Qp = 953.272 + sum of
Qb Ia/Ib
21.500 * 0.676 = 14.534
, Qp = 967.806
Total of 2 streams to confluence:
~ Flow rates before confluence point:
953.272 21.500
Area of streams before confluence:
734.660 7.600
~ Results of confluence:
Total flow rate = 967.806(CFS) e4~
Time of concentration = 23.680 min. ~
, Effective stream area after confluence = 742.260(AC.)
,
,
~
~
'
i
~
'
'
,
~
'
412
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 85.000 to Point/Station 86.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 53.100(Ft.)
Downstream point elevation = 42.300(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 = 969.795(CFS)
Depth of flow = 2.353(Ft.), Average velocity =
Channel flow top width = 58.822(Ft.)
Flow Velocity = 8.34(Ft/s)
Travel time = 2.14 min.
Time of concentration = 25.82 min.
969.795(CFS)
8.342(Ft/s)
Sub-Channel No. 1 Critical depth = 2.406(Ft.)
' ' ' Critical flow top width = 59.250(Ft.)
' ' ' Critical flow velocity= 8.122(Ft/s)
' ' ' Critical flow area = 119.410(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.687
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 = 2.067(In/Hr) for a 100.0 year stornt
Subarea runoff = 4.330(CFS) for 3.050(AC.)
Total runoff = 972.136(CFS) Total area = 745.310(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 = 745.310(AC.)
Runoff from this stream = 972.136(CFS)
Time of concentration = 25.82 min.
Rainfall intensity = 2.067(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 stozm
APARTMENT subarea type
Runoff Coefficient = 0.860 ~
Decimal fraction soil group A= 0.000
, Ti3
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) 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 nonnal 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
' No. (CFS) (min) (In/Hr)
' 1 972.136 25.82 2.067
2 33.810 14.94 2.793
Largest stream flow has longer time of concentration
~ Qp = 972.136 + sum of
Qb Ia/Ib
33.810 * 0.740 = 25.026
4p = 997.162
, Total of 2 streams to confluence:
Flow rates before confluence point:
~ 972.136 33.810
Area of streams before confluence:
745.310 14.500
Results of confluence:
~ Total flow rate = 997.162(CFS)
Time of concentration = 25.817 min.
Effective stream area after confluence = 759.810(AC.)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 86.000 to Point/Station 87.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 42.300(Ft.)
~ Downstream point elevation = _ 37.000(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 = 998.179(CFS)
, Manning's 'N' = 0.028 _
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 998.179(CFS)
Depth of flow = 2.398(Ft.), Average velocity = 8.395(Ft/s) ~c`
' Channel flow top width = 59.182(Ft.)
, 4~4
Flow Velocity = 8.39(Ft/s)
Travel time = 1.05 min.
I~ Time of concentration = 26.87 min.
Sub-Channel No. 1 Critical depth = 2.469(Ft.)
~ ' ' Critical flow top width = 59.750(Ft.)
~ ~ ~ ~ Critical flow velocity= 8.107(Ft/s)
~ ~ ' Critical flow area = 123.129(Sq.Ft)
I' Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.683
', 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 = 2.022(In/Hr} for a 100.0 year stornl
Subarea runoff = 2.141(CFS) for 1.550(AC.)
Total runoff = 999.303(CFS) Total area = 761.360(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 = 761.360(AC.)
Runoff from this stream = 999.303(CFS)
Time of concentration = 26.87 min.
Rainfall intensity = 2.022(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; Zmpervious 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 norntal stream number 2
Stream flow area = 5.500(AC.)
Runoff from this stream = 12.620(CFS) ~
' Time of concentration = 14.47 min.
' 4i~
Rainfall intensity = 2.842(In/Hr)
, Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
,
1 999.303 26.87 2.022
' 2 12.620 14.47 2.842
Largest stream flow has longer time of concentration
Qp = 999.303 + sum of
, Qb Ia/Ib
12.620 * 0.711 = 8.979
Qp = 1008.282
, Total of 2 streams to confluence:
Flow rates before confluence point:
999.303 12.620
' Area of streams before confluence:
761.360 5.500
Results of confluence:
Total flow rate = 1008.282(CFS)
' Time of concentration = 26.870 min.
Effective stream area after confluence = 766.860(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 87.000 to Point/Station 88.000
**** IMPROVED CHANNEL TRAVEL TIME ****
, Upstream point elevation = 3~.000(Ft.)
Downstream point elevation = 28.500(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 = 1009.906(CFS)
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
~ Flow(q) thru subarea = 1009.906(CFS)
Depth of flow = 2.422(Ft.), Average velocity = 8.393(Ft/s)
Channel flow top width = 59.373(Ft.)
, Flow Velocity-= 8.39(Ft/s)
Travel time 1.71 min.
Time of concentration = 28.58 min.
~ Sub-Channel No. 1 Critical depth = 2.469(Ft.)
' ' ' Critical flow top width = 59.750(Ft.)
' ' ' Critical flow velocity= 8.202(Ft/s)
' ' ' ' Critical flow area = 123.129(Sq.Ft)
Adding area flow to channel
' UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.678
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 `,!J'~
, Pervious area fraction = 1.000; Impervious fraction = 0.000
, 4 iG,
Rainfall intensity = 1.955(In/Hr) for a 100.0 year stonn
, Subarea runoff = 3.271(CFS) for 2.470(Ac.)
Total runoff = 1011.553(CFS) Total area = 769.330(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 1 in norntal stream number 1
Stream flow area = 769.330(Ac.)
' Runoff from this stream = 1011.553(CFS)
Time of concentration = 28.58 min.
Rainfall intensity = 1.955(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 stoxm
SINGLE FAMILY (1/4 Acre Lot)
, 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)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process Prom 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 Rainfall Intensity
No. (CFS) (min) (In/Hr)
,
'
,
L
1 1011.553 28.58 1.955
2 21.580 16.71 2.626
Largest stream flow has longer time of concentration
Qp = 1011.553 + sum of
Qb ia/Ib
21.580 * 0.744 = 16.065
Qp = 1027.618
Total of 2 streams to confluence:
Flow rates before confluence point:
1011.553 21.580
V~ `
, -.i~
Area of streams before confluence:
, 769.330 13.040
Results of confluence:
Total flow rate = 1027.618(CFS)
Time of concentration = 28.577 min.
, Effective stream area after confluence = 782.370tAc.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in noxmal stream number 1
Stream flow area = 782.370(AC.)
Runoff from this stream = 1027.618(CFS)
' Time of concentration = 28.58 min.
Rainfall intensity = 1.955(In/Hr)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 8.050 to Point/Station 8.050
**** USER DEFINED FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 2.139(In/Hr) for a 100.0 year storni
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 1027.618 28.58 1.955
2 200.350 24.26 2.139
Largest stream flow has longer time of concentration
' Qp = 1027.618 + sum of
Qb Ia/Ib
200.350 * 0.914 = 183.091
4P = 1210.709 ~$`~
,
,
'
,
'
Total of 2 streams to confluence:
Flow rates before confluence point:
1027.618 200.350
Area of streams before confluence:
782.370 110.760
Results of confluence:
Total flow rate = 1210.709(CFS)
Time of concentration = 28.577 min.
Effective stream area after confluence =
4~t~
893.130(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 88.000 to Point/Station 89.000
**** IMPROVED CHANNEL TRAVEL TIME ****
' Upstream point elevation = 28.100(Ft.)
Downstream point elevation = 20.600(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 = 1212.539(CFS)
' Manning's 'N' = 0.028 -
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 1212.539(CFS)
, Depth of flow = 2.702(Ft.), Average velocity = 8.189(Ft/s)
Channel flow top width = 65.613(Ft.)
Flow Velocity = 8.19(Ft/s)
Travel time = 1.87 min.
, Time of concentration = 30.45 min.
Sub-Channel No. 1 Critical depth = 2.625(Ft.)
' ' ' ' Critical flow top width = 65.000(Ft.)
' ' ' Critical flow velocity= 8.476(Ft/s)
' ' ' Critical flow area = 143.063(Sq.Ft)
, Adding area flow to channel
UNDEVELO PED (good cover) subarea
Runoff Coefficient = 0.672
, 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
t RI index for soil(AMC 2) 67. 50
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 1.888( In/Hr) for a 100.0 year storm
' Subarea runoff = 3.423(CFS) for 2.700(Ac.)
Total ru noff = 1214.133(CFS) Total area = 895.830(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 = 895.830(Ac.)
Runoff from this stream = 1214.133(CFS)
Time of concentration = 30.45 min.
Rainfall intensity = 1.888(In/Hr) ~
'
1 ~' ~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, 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)
,
'
'
J
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 9.020 to Point/Station 9.020
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nonnal stream number 2
Stream flow area = 31.980(AC.)
Runoff from this stream = 51.170(CFS)
Time of concentration = 14.86 min.
Rainfall intensity = 2.801(In/Hr)
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
Rainfall Intensity
(In/Hr)
1 1214.133 30.45 1.888
' 2 51.170 14.86 2.801
Largest stream flow has longer time of concentration
Qp = 1214.133 + sum of
Qb Ia/Ib
, 51.170 * 0.674 = 34.487
Qp = 1248.620
' Total of 2 streams to confluence:
Flow rates before confluence point:
1214.133 51.170
, Area of streams before confluence:
895.830 31.980
Results of confluence:
Total flow rate = 1248.620(CFS)
, Time of concentration = 30.450 min.
Effective stream area after confluence = 927.810(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 = 927.810(AC.)
' Runoff from this stream = 1248.620(CFS) ~~^~
'
,
'
~
'
'
'
1
'
,
'
'
'
'
420
Time of concentration = 30.45 min.
Rainfall intensity = 1.888(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 stornl
CO[~IERCIAL 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)
Total area = 7.22(AC.) Total runoff = 14.56(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 7.220(Ac.)
Runoff from this stream = 14.560(CFS)
Time of concentration = 28.82 min.
Rainfall intensity = 1.946(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 1248.620 30.45
2 14.560 28.82
Largest stream flow has longer
Qp = 1248.620 + sum of
Qb Ia/Ib
14.560 * 0.970 =
Qp = 1262.746
1.888
1.946
time of concentration
14.126
' Total of 2 streams to confluence:
Flow rates before confluence point:
1248.620 14.560
Area of streams before confluence:
, 927.810 7.220
Results of confluence:
Total flow rate = 1262.746(CFS)
Time of concentration = 30.450 min.
' Effective stream area after confluence =
,
'
935.030(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
**** CONFLUENCE OF MINOR STREAMS **** `~
,
'
'
~
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 935.030(AC.)
Runoff from this stream = 1262.746(CFS)
Time of concentration = 30.45 min.
Rainfall intensity = 1.888(In/Hr)
~z i
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 11.050 to Point/Station 11.050
**** USER DEFINED 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)
' 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 nonnal stream number 2
Stream flow area = 52.750(AC.)
Runoff from this stream = 103.620(CFS)
Time of concentration = 19.53 min.
, Rainfal l intensity = 2.410(In/Hr)
Summary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
'
'
'
,
,
'
'
1 1262.746 30.45 1.888
2 103.620 19.53 2.410
Largest stream flow has longer time of concentration
Qp = 1262.746 + sum of
Qb Ia/Ib
103.620 * 0.783 = 81.163
Qp = 1343.909
Total of 2 streams to confluence:
Flow rates before confluence point:
1262.746 103.620
Area of streams before confluence:
935.030 52.750
Results of confluence:
Total flow rate = 1343.909(CFS)
Time of concentration = 30.450 min.
Effective stream area after confluence
End of computations, total study area =
The following figures may
be used for a unit hydrograph study of
= 987.780(AC.)
987.78 (AC.)
the same area.
~5 ~
' ~v_
' Area averaged pervious area fraction(Ap) = 0.471
Area averaged RI index number = 61.6
'
'
,
,
,
'
J
'1
1
1
i
1
1
1
1
1
1 ~'
So~
~
' Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDESIGN Engineering Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: O1/22/03 File:305ACH.out
- ------------------------------------------------------------------------
' TR 29798 (NORTH HALF) & TR 30264 (SOUTH HALF) DEVELOPED W/oFF-5~'t'E5
100 YEAR STORM
' JN 32006
--------------------------------------------------- - ------------------
********* HydrOlOgy Study Contr0l IrifOrntatiOn *****~****
' English (in-lb) Units used in input data file
1 ------------------------------------------------------------------------
Lohr & Associates, Inc., Temecula, CA'- S/N 773
------------------------------------------------------------------------
' Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
~ Stoxin event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves
~ For the [ Murrieta,Tmc,Rnch CaNOrco
10 year storm 10 minute intensity =
/~ 10 year storm 60 minute intensity =
~ 100 year storm 10 minute intensity
~` 100 year storm 60 minute intensity
,
Storm event year = 100.0
~ Calculated rainfall intensity data:
1 hour intensity = 1.300(In/Hr)
Slope of intensity duration curve =
,
~
1~
~1
~~~
;~
; _
'L
I'
Y '
1
data (Plate D-4.1)
] area used.
2.360(In/Hr)
0.880(In/Ar)
= 3.480(In/Ar)
= 1.300(In/Hr)
0.5500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 80.000 to Point/Station 80.000
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.029(In/Hr) for a 100.0 year stonn
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.797
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) = 69.00
Pervious area fraction = 0.500; Impervious fraction = 0.500
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 80.000 to Point/Station 51.000,~p
~/ 1
' Jf 0 %
**** IMPROVED CHANNEL TRAVEL TIME ****
~ Upstream point elevation = 127.800(Ft.)
Downstream point elevation = 113.600(Ft.)
Channel length thru subarea = 1122.000(Ft.)
' Channel base width = 24.000(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 = 326.314(CFS)
Manning~s 'N~ = 0.028
Maximum depth of channel = 6.000(Ft.)
' Flow(q) thru subarea = 326.314(CFS)
Depth of flow = 1.545(Ft.), Average velocity = 6.998(Ft/s)
Channel flow top width = 36.360(Ft.)
Flow Velocity = 7.00(Ft/s)
' Travel time = 2.67 min.
Time of concentration = 29.37 min.
~ Sub-Channel No. 1 Critical depth = 1.625(Ft.)
' ' ' Critical flow top width = 37.000(Ft.)
~ ' ' Critical flow velocity= 6.584(Ft/s)
' ' ' Critical flow area = 49.563(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (good cover) subarea
, Runoff Coefficient = 0.624
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 = 1.926(In/Hr) for a 100.0 year storm
Subarea runoff = 3.724(CFS) for 3.100(Ac.)
Total runoff = 327.724(CFS) Total area = 220.100(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 81.000 to Point/Station 81.000
~ **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
' Stream flow area = 220.100(AC.)
Runoff from this stream = 327.724(CFS)
Time of concentration = 29.37 min.
~ Rainfall intensity = 1.926(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 1.020 to Point/Station 1.020
**** USER DEFINED FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 2.675(In/Hr) for a 100.0 year stonn
UNDEVELOPED (fair cover) subarea
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
Decimal fraction soil group D= 0.000
' RI index for soil(AMC 2) = 74.00 '(~p
'
~
,
~
~
~
~
'
~
~
'
'
'
~
Li
'
,
~
~
Sd3
Pervious area fraction = 1.000; Impervious fraction = 0.000
User specified values are as follows:
TC = 16.16 min. Rain intensity = 2.67(In/Hr)
Total area = 40.85(Ac.) Total runoff = 81.50(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1.020 to Point/Station 1.020
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal stream number 2
Stream flow area = 40.850(Ac.)
Runoff from this stream = 81.500(CFS)
Time of concentration = 16.16 min.
Rainfall intensity = 2.675(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 327.724 29.37 1.926
2 81.500 16.16 2.675
Largest stream flow has longer time of concentration
Qp = 327.724 + s um of
Qb Ia/Ib
81.500 * 0.720 = 58.673
Qp = 386.397
Total of 2 streams to confluence:
Flow rates before confluence point:
327.724 81.500
Area of streams before confluence:
220.100 40.850
Results of confluence:
Total flow rate = 386.397(CFS)
Time of concentration = 29.372 min.
Effective stream area after confluence = 260.950(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 81.000 to Point/Station 82.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 113.200(Ft.)
Downstream point elevation = 102.800(Ft.)
Channel length thru subarea = 890.000(Ft.)
Channel base width = 38.000(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 = 388.322(CFS)
Depth of flow = 1.371(Ft.), Average velocity =
Channel flow top width = 48.970(Ft.)
Flow Velocity = 6.51(Ft/s)
Travel time = 2.28 min.
Time of concentration = 31.65 min.
= 388.322(CFS)
6.512(Ft/s)
t61
, 50~
Sub-Channel No. 1 rritical depth = 1.406(Ft.)
' ' ' Critical flow top width = 49.250(Ft.)
, ~ ~ ' Critical flow velocity= 6.330(Ft/s)
~ ' ' Critical flow area = 61.348(Sq.Ft)
~ Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.616
~ 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 = 1.848(In/Hr) for a 100.0 year storm
' Subarea runoff = 2.959(CFS) for 2.600(AC.)
Total runoff = 389.356(CFS) Total area = 263.550(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 82.000 to Point/Station 82.000
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in nonnal stream number 1
Stream flow area = 263.550(Ac.)
a Runoff from this stream = 389.356(CFS)
Time of concentration = 31.65 min.
Rainfall intensity = 1.848(In/Hr)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.010 to Point/Station 2.010
, **** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.581(In/Hr) for a 100.0 year stonn
' SINGLE FAMILY (1/4 Acre Lot)
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) = 62.50
~ Pervious area fraction = 0.500; Impervious fraction = 0.500
User specified values are as follows:
TC = 17.24 min. Rain intensity = 2.58(In/Hr)
' Total area = 27.00(AC.) Total runoff = 59.45(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 2.010 to Point/Station 2.010
**** CONFLUENCE OF MINOR STREAMS ****
~ Along Main Stream number: 1 in normal stream number 2
Stream flow area = 27.000(AC.)
Runoff from this stream = 59.450(CFS)
' Time of concentration = 17.24 min.
Rainfall intensity = 2.581(Zn/Hr)
Summary of stream data:
, Stream Flow rate TC Rainfall Intensity ~~
' No. (CFS) (min)
'
~
~~
~
r
~
,
1 389.356 31.65
2 59.450 17.24
Largest stream fl ow has longer
Qp = 389.356 + sum of
Qb Ia/Ib
59.450 * 0.716 =
Qp = 431.920
(In/Hr)
1.848
2.581
time of concentration
42.564
Total of 2 streams to confluence:
Flow rates before confluence point:
389.356 59.450
Area of streams before confluence:
263.550 27.000
Results of confluence:
Total flow rate = 431.920(CFS)
Time of concentration = 31.650 min.
Effective stream area after confluence =
290.550(AC.)
~ ++++++++++++++++++++++++++++
Process from Point/Station
**** IMPROVED CHANNEL TRAVEL
~
'
,
'
~
~~'~
~
,
'
'
I,~
LJ
82.000 to Point/Station
TIME ****
Sdb
+++++++++++
83.000
Upstream point elevation = 102.800(Ft.)
Downstream point elevation = 79.200(Ft.)
Channel length thru subarea = 1360.000(Ft.)
Channel base width = 38.000(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 = 434.893(CFS)
Depth of flow = 1.306(Ft.), Average velocity =
Channel flow top width = 48.445(Ft.)
Flow Velocity = 7.71(Ft/s)
Travel time = 2.94 min.
Time of concentration = 34.59 min.
434.893(CFS)
7.706(Ft/s)
Sub-Channel No. 1 Critical depth = 1.516(Ft.)
' ' ' Critical flow top width = 50.125(Ft
' ' ' Critical flow velocity= 6.512(Ft/s)
' ' ' Critical flow area = 66.782(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.606
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 = 1.760(In/Hr) for a 100.0 year stonn
Subarea runoff = 4.268(CFS) for 4.000(Ac.)
Total runoff = 436.188(CFS) Total area = 294.550(AC.)
~~
'
~
'
'
~bl
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 83.000 to Point/Station 83.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 294.550(AC.)
Runoff from this stream = 436.188(CFS)
Time of concentration = 34.59 min.
Rainfall intensity = 1.760(In/Ar)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.040 to Point/Station
**** USER DEFINED FLOW INFORMFITION AT A POINT ****
~
~~
L
~
~
,
'
'
'
,
~
'
'
'
'
++++++++
2.040
Rainfall intensity = 2.382(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.763
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 = 19.95 min. Rain intensity = 2.38(In/Hr)
Total area = 30.90(AC.) Total runoff = 59.63(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.040 to Point/Station 2.040
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 30.900(AC.)
Runoff from this stream = 59.630(CFS)
Time of concentration = 19.95 min.
Rainfall intensity = 2.382(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 436.188 34.59
2 59.630 19.95
Largest stream flow has longer
Qp = 436.188 + sum of
Qb Ia/ib
59.630 * 0.739 =
Qp = 480.244
1.760
2.382
time of concentration
44.056
Total of 2 streams to confluence:
Flow rates before confluence point:
436.188 59.630
Area of streams before confluence:
294.550 30.900
Results of confluence:
Total flow rate = 480.244(CFS)
`~~
_
' SOB
Time of concentration = 34.591 min.
' Effective stream area after confluence = 325.450(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 83.000 to Point/Station 84.000
**** IMPROVED CHANNEL TRAVEL TIME ****
' Upstream point elevation = 79.200(Ft.)
Downstream point elevation = 59.600(Ft.)
Channel length thru subarea = 1300.000(Ft.)
Channel base width = 38.000(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 = 483.122(CFS)
' Manning's 'N' = 0.028 -
Maximum depth of channel 6.000(Ft.)
Flow(g) thru subarea = 483.122(CFS)
' Depth of flow = 1.446(Ft.), Average velocity = 7.633(Ft/s)
Channel flow top width = 49.564(Ft.)
Flow Velocity = 7.63(Ft/s)
Travel time = 2.84 min.
' Time of concentration = 37.43 min.
Sub-Channel No. 1 Critical depth = 1.609(Ft.)
' ' ' ' Critical flow top width = 50.875(Ft.)
' ' ' Critical flow velocity= 6.755(Ft/s)
' ' ' Critical flow area = 71.517(Sq.Ft)
' Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.598
' 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 = 1.685(In/Hr) for a 100.0 year stornl
' Subarea runoff = 3.928(CFS) for 3.900(Ac.)
Total runoff = 484.172(CFS) Total area = 329.350(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
' **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 329.350(AC.)
~ Runoff from this stream = 484.172(CFS)
Time of concentration = 37.43 min.
Rainfall intensity = 1.685(In/Hr)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 2.050 to Point/Station 2.050
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.817(In/Hr) for a 100.0 year storm
' APARTMENT subarea type ~~
' So~
Runoff Coefficient = 0.851
I, 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) = 56.00
Pervious area fraction = 0.200; Impervious fraction = 0.800
User specified values are as follows:
' TC = 14.71 min. Rain intensity = 2.82(In/Hr)
Total area = 19.10(AC.) Total runoff = 47.36(CFS)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 2.050 to Point/Station 2.050
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 1 in normal stream number 2
Stream flow area = 19.100(Ac.)
' Runoff from this stream = 47.360(CFS)
Time of concentration = 14.71 min.
Rainfall intensity = 2.817(In/Hr)
Summary of stream data:
' Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 484.172 37.43 1.685
' 2 47.360 14.71 2.817
Largest stream flow has longer time of concentration
Qp = 484.172 + sum of
Qb Ia/Ib
' 47.360 * 0.598 = 28.335
Qp = 512.508
' Total of 2 streams to confluence:
Flow rates before confluence point:
484.172 47.360
Area of streams before confluence:
329.350 19.100
Results of confluence:
Total flow rate = 512.508(CFS)
' Time of concentration = 37.430 min.
Effective stream area after confluence = 348.450(AC.)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 1 in normal stream number 1
Stream flow area = 348.450(Ac.)
' Runoff from this stream = 512.508(CFS)
Time of concentration = 37.43 min.
Rainfall intensity = 1.685(Zn/Hr)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1202.000 to Point/Station 1202.OOOtro
~ **** USER DEFINED FLOW INFORMATION AT A POINT **** `-~~
'
'
'
~
'
'
~I
L~
,
~
~
~
r
u
'
~
J
5 I c~
Rainfall intensity = 2.787(In/Hr) for a 100.0 year storm
CODM9ERCIAL 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 = 93.62(AC.) Total runoff = 114.63(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1202.000 to Point/Station 1202.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 93.620(Ac.)
Runoff from this stream = 114.630(CFS)
Time of concentration = 15.00 min.
Rainfall intensity = 2.787(In/Hr)
Summary of stream data:
Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
1 512.508 37.43
2 114.630 15.00
Largest stream flow has longer
Qp = 512.508 + sum of
Qb Ia/Ib
114.630 * 0.605 =
Qp = 581.831
1.685
2.787
time of concentration
69.323
Total of 2 streams to confluence:
Flow rates before confluence point:
512.508 114.630
Area of streams before confluence:
348.450 93.620
Results of confluence:
Total flow rate = 581.831(CFS)
Time of concentration = 37.430 min.
Effective stream area after confluence =
442.070(AC.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 84.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number:
Stream flow area = 442
Runoff from this stream =
' Time of concentration =
Rainfall intensity =
,
1 in normal stream number 1
070(AC.)
581.831(CFS)
37.43 min.
.685(In/Hr)
Y~o~
' S11
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 4.080 to Point/Station 4.080
**** USER DEFINED FLOW INFORMATION AT A POINT ****
Rainfall intensity = 2.230(In/Hr) for a 100.0 year stonn
' SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
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 = 22.49 min. Rain intensity = 2.23(In/Hr)
' Total area = 507.92(AC.) Total runoff = 697.32(CFS)
, ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 4.080 to Point/Station 4.080
**** CONFLUENCfi OF MINOR STREAMS ****
' Along Main Stream number: 1 in normal stream number 2
Stream flow area = 507.920(AC.)
Runoff from this stream = 697.320(CFS)
' Time of concentration = 22.49 min.
Rainfall intensity = 2.230(In/Hr)
Summary of stream data:
, Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
' 1 581.831 37.43 1.685
2 697.320 22.49 2.230
' Largest stream flow has longer or shorter time of concentration
Qp = 697.320 + sum of
Qa Tb/Ta
581.831 * 0.601 = 349.600
~ Qp = 1046.920
Total of 2 streams to confluence:
' Flow rates before confluence point:
581.831 697.320
Area of streams before confluence:
' 442.070 507.920
Results of confluence:
Total flow rate = 1046.920(CFS)
Time of concentration = 22.490 min.
' Effective stream area after confluence = 949.990(AC.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 84.000 to Point/Station 85.000
**** IMPROVED CHANNEL TRAVEL TIME ****
'
'
Upstream point elevation = 59.000(Ft.)
Downstream point elevation = 53.100(Ft.)
Channel length thru subarea = 590.000(Ft
Channel base width = 40.000(Ft.)
Y~/v
5~2
' 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 = 1047.840(CFS)
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
' Flow(q) thru subarea = 1047.840(CFS)
Depth of flow = 2.464(Ft.), Average velocity = 8.528(Ft/s)
Channel flow top width = 59.716(Ft.)
, Flow Velocity-= 8.53(Ft/s)
Travel time 1.15 min.
Time of concentration = 23.64 min.
' Sub-Channel No. 1 Critical depth = 2.531(Ft.)
~ ' ' Critical flow top width = 60.250(Ft.)
~ ' ' Critical flow velocity= 8.259(Ft/s)
' ~ ~ ~ Critical flow area = 126.879(Sq.Ft)
Adding area flow to channel
' UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.646
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
1 Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.170(In/Hr) for a 100.0 year storm
Subarea runoff = 2.341(CFS) for 1.670(AC.)
A Total runoff = 1049.261(CFS) Total area = 951.660(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 85.000 to Point/Station 85.000
**** CONFLUENCE OF MINOR STREAMS ****
' Along Main Stream number: 1 in normal stream number 1
Stream flow area = 951.660(AC.)
Runoff from this stream = 1049.261(CFS)
' Time of concentration = 23.64 min.
Rainfall intensity = 2.170(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
, 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 = 11.62 min. Rain intensity = 3.21(In/Hr)
Total area = 7.60(AC.) Total runoff = 21.50(CFS)
, ~
i~~
' +++++++++++++++++++++++4+++4+++++++t+++++++++++t++++++++++++++++++++++
, Process from Point/Station 5.000 to Point/Station 5.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal 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 1049.261 23.64 2.170
2 21.500 11.62 3.207
Largest stream flow has longer time of concentration
' Qp = 1049.261 + sum of
Qb Ia/Ib
21.500 * 0.677 = 14.547
Qp = 1063.807
~ Total of 2 streams to confluence:
Flow rates before confluence point:
~ 1049.261 21.500
Area of streams before confluence:
951.660 7.600
~ Results of confluence:
Total flow rate = 1063.807(CFS)
Time of concentration = 23.643 min.
Effective stream area after confluence = 959.260(Ac.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 85.000 to Point/Station 86.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 53.100(Ft.)
' Downstream point elevation = - 42.300(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 = 1065.499(CFS)
' Manning's 'N' = 0.028 _
Maximum depth of channel 6.000(Ft.)
Flow(q) thru subarea = 1065.499(CFS)
Depth of flow = 2.481(Ft.), Average velocity = 8.601(Ft/s)
' Channel flow top width = 59.850(Ft.)
Flow Velocity = 8.60(Ft/s)
Travel time = 2.07 min.
' Time of concentration = 25.72 min.
Sub-Channel No. 1 Critical depth = 2.563(Ft.)
~ ' ' Critical flow top width = 60.500(Ft.)
' ' ' ' Critical flow velocity= 8.275(Ft/s)
' ' ' Critical flow area = 128.766(Sq.Ft)
' Adding area flow to channel ~
1
Cli
~
~
'
~
~',
~
I~
~
'
'
'
,
~
~
u
'
i
'
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.687
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 = 2.072(In/Hr) for a 100.0 year storm
Subarea runoff = 4.341(CFS) for 3.050(AC.)
Total runoff = 1068.149(CFS) Total area = 962.310(AC.)
si~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 86.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal stream number 1
Stream flow area = 962.310(Ac.)
Runoff from this stream = 1068.149(CFS)
Time of concentration = 25.72 min.
Rainfall intensity = 2.072(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 storm
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
No. (CFS) (min) (In/Hr)
1 1068.149 25.72 2.072
2 33.810 14.94 2.793
Largest stream flow has longer time of concentration
V ~~
, /IJ
Qp = 1068.149 + sum of
' Qb Ia/Ib
33.810 * 0.742 = 25.080
Qp = 1093.228
' Total of 2 streams to confluence:
Flow rates before confluence point:
1068.149 33.810
~ Area of streams before confluence:
962.310 14.500
Results of confluence:
~ Total flow rate = 1093.228(CFS)
Time of concentration = 25.716 min.
Effective stream area after confluence = 976.810(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 86.000 to Point/Station 87.000
~ **** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 42.300(Ft.)
Downstream point elevation = 37.000(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 = 1094.096(CFS)
Manning's 'N' = 0.028
~ Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1094.096(CFS)
Depth of flow = 2.525(Ft.), Average velocity = 8.648(Ft/s)
Channel flow top width = 60.202(Ft.)
' Flow Velocity_= 8.65(Ft/s)
Travel time 1.02 min.
Time of concentration = 26.74 min.
' Sub-Channel No. 1 Critical depth = 2.594(Ft.)
' ' ' Critical flow top width = 60.750(Ft.)
~ ~ ' Critical flow velocity= 8.374(Ft/s)
' ~ ~ ' Critical flow area = 130.660(Sq.Ft)
Adding area flow to channel
' UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.684
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 = 2.028(In/Hr) for a 100.0 year stonn
Subarea runoff = 2.148(CFS) for 1.550(Ac.)
Total runoff = 1095.377(CFS) Total area = 978.360(Ac.)
~
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 `.~
_ _ __
' :; r~
Stream flow area = 978.360(AC.)
' Runoff from this stream = 1095.377(CFS)
Time of concentration = 26.74 min.
Rainfall intensity = 2.028(In/Hr)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 5.030 to Point/Station 5.030
~ **** USER DEFINED FLOW INFORMIITION AT A POINT ****
Rainfall intensity = 2.842(In/Ar) 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)
'
C
,
'
,
1
1 1095.377 26.74
2 12.620 14.47
Largest stream flo w has longer
Qp = 1095.377 + sum of
Qb Ia/Ib
12.620 * 0.713 =
Qp = 1104.380
2.028
2.842
time of concentration
9.003
Total of 2 streams to confluence:
Flow rates before confluence point:
1095.377 12.620
Area of streams before confluence:
978.360 5.500
Results of confluence:
Total flow rate = 1104.380(CFS)
Time of concentration = 26.738 min.
Effective stream area after confluence =
983.860(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
' Process from Point/Station 87.000 to Point/Station 88.000 ~j
~ **** IMPROVED CHANNEL TRAVEL TIME ****
'
~
'
'
'
~
~
'
~
517
IIpstream point elevation = 37.000(Ft.)
Downstream point elevation = 28.500!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 =
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1105.766(CFS)
Depth of flow = 2.549(Ft.), Average velocity =
Channel flow top width = 60.390(Ft.)
Flow Velocity = 8.64(Ft/s)
Travel time = 1.66 min.
Time of concentration = 28.40 min.
1105.766(CFS)
8.643(Ft/S)
Sub-Channel No. 1 Critical depth = 2.625(Ft.)
' ' ' Critical flow top width = 61.000(Ft.)
' ' ' Critical flow velocity= 8.341(Ft/s)
' ' ' Critical flow area = 132.563(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.678
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 = 1.962(In/Hr) for a 100.0 year storm
Subarea runoff = 3.286(CFS) for 2.470(AC.)
Total runoff = 1107.666(CFS) Total area = 986.330(Ac.)
- ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 88.000 to Point/Station 88.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nonnal stream number 1
' Stream flow area = 986.330(AC.)
Runoff from this stream = 1107.666(CFS)
Time of concentration = 28.40 min.
~ Rainfall intensity = 1.962(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 stoxnt
SINGLE FAMILY (1/4 Acre Lot)
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
, S I$
Pervious area fraction = 0.500; Impexvious 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 nonnal 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 Rainfall Intensity
~ No. (CFS) (min) (In/Hr)
1 1107.666 28.40 1.962
' 2 21.580 16.71 2.626
Largest stream flow has longer time of concentration
Qp = 1107.666 + sum of
' Qb Ia/Ib
21.580 * 0.747 = 16.121
Qp = 1123.787
1 Total of 2 streams to confluence:
Flow rates before confluence point:
1107.666 21.580
~ Area of streams before confluence:
986.330 13.040
Results of confluence:
Total flow rate = 1123.787(CFS)
~ Time of concentration = 28.396 min.
Effective stream area after confluence = 999.370(AC.)
I ~~
'
~
~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 = 999.370(Ac.)
Runoff from this stream = 1123.787(CFS)
Time of concentration = 28.40 min.
Rainfall intensity = 1.962(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 8.050 to Point/Station S.O50
**** USER DEFINED FLOW INFORMATION AT A POINT ****
' Rainfall intensity = 2.139(In/Hr) for a 100.0 year storni
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)
5!°
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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
No. (CFS) (min)
1 1 123.787 28.40
2 200.350 24.26
Largest stream flow has longer
Qp = 1123.787 + sum of
Qb Ia/Ib
200.350 * 0.917 =
Qp = 1307.519
Rainfall Intensity
(In/Hr)
1.962
2.139
time of concentration
183.733
Total of 2 streams to confluence:
~ Flow rates before confluence point:
1123.787 200.350
' Area of streams before confluence:
999.370 110.760
Results of confluence:
Total flow rate = 1307.519(CFS)
' Time of concentration = 28.396 min.
_ Effective stream area after confluence =
~
~
'
~
'
'
1110.130(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 88.000 to Point/Station 89.000
**** IMPROVED CHANNEL TRAVEL TIME ****
Upstream point elevation = 28.100(Ft.)
Downstream point elevation = 20.600(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 =
Manning's 'N' = 0.028
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 1309.109(CFS)
Depth of flow = 2.821(Ft.), Average velocity =
Channel flow top width = 66.568(Ft.)
Flow Velocity = 8.39(Ft/s)
1309.109(CFS)
8.394(Ft/s)
~~
I.~~
~
~~
O
~
~
u
~
,
,
~
~I
r
1
~
~
Travel time = 1.83 min.
Time of concentration = 30.22 min.
Sub-Channel No. 1 Critical depth = 2.750(Ft.)
' ' ' Critical flow top width = 66.000(Ft.)
' ' ' Critical flow velocity= 8.655(Ft/s)
' ' ' Critical flow area = 151.250(Sq.Ft)
Adding area flow to channel
UNDEVELOPED (good cover) subarea
Runoff Coefficient = 0.672
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 = 1.896(In/Hr) for a 100.0 year storm
Subarea runoff = 3.441(CFS) for 2.700(AC.)
Total runoff = 1310.960(CFS) Total area = 1112.830(AC.)
52v
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 = 1112.830(Ac.)
Runoff from this stream = 1310.960(CFS)
Time of concentration = 30.22 min.
Rainfall intensity = 1.896(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 ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 31.980(Ac.)
Runoff from this stream = 51.170(CFS)
Time of concentration = 14.86 min.
Rainfall intensity = 2.801(In/Hr) ~.~.
, Summary of stream data:
' Stream Flow rate
No. (CFS}
TC Rainfall Intensity
(min) (In/Hr)
` 1 1310.960 30.22 1.896
2 51.170 14.86 2.801
~ Largest stream flow has longer time of concentration
Qp = 1310.960 + sum of
- Qb Ia/Ib
51.170 * 0.677 = 34.629
' Qp = 1345.589
Total of 2 streams to confluence:
' Flow rates before confluence point:
1310.960 51.170
Area of streams before confluence:
' 1112.830 31.980
Results of confluence:
Total flow rate = 1345.589(CFS)
Time of concentration = 30.223 min.
~ Effective stream area after confluence = 1144.810(Ac.)
57f
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
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 = 1144.810(Ac.)
Runoff from this stream = 1345.589(CFS)
~ Time of concentration = 30.22 min.
Rainfall intensity = 1.896(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
COMMERCIAL 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)
Total area = 7.22(Ac.) Total runoff = 14.56(CFS)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
' **** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
' Stream flow area = 7.220 (AC. ) ,~,~,tj
, Runoff from this stream = 14.560(CFS)
, Time of concentration = 28.82 min.
Rainfall intensity = 1.946(In/Hr)
Summary of stream data:
, Stream Flow rate TC
No. (CFS) (min)
~
~
I~
~
~
'
~
I~
~
'~
L
'
u
~
,
,
1 1345.589 30.22
2 14.560 28.82
Larg est stream flow has longer
Qp = 1345.589 + sum of
Qb Ia/Ib
14.560 * 0.974 =
Qp = 1359.774
Rainfall Intensity
(In/Hr)
1.896
1.946
time of concentration
14.184
Total of 2 streams to confluence:
Flow rates before confluence point:
1345.589 14.560
Area of streams before confluence:
1144.810 7.220
Results of confluence:
Total flow rate = 1359.774(CFS)
Time of concentration = 30.223 min.
Effective stream area after confluence = 1152.030(AC.)
7 ~2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 1206.000 to Point/Station 1206.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in nozmal stream number 1
Stream flow area = 1152.030(AC.)
Runoff from this stream = 1359.774(CFS)
Time of concentration = 30.22 min.
Rainfall intensity = 1.896(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 11.050 to Point/Station 11.050
**** USER DEFINED 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)
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 **** '~`~
~
5?3
i~ Along Main Stream number: 1 in noYmal 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 1359.774 30.22 1.896
2 103.620 19.53 2.410
Largest stream flow has longer time of concentration
' Qp = 1359.774 + sum of
Qb Ia/ib
103.620 * 0.787 = 81.498
' Qp = 1441.271
Total of 2 streams to confluence:
Flow rates before confluence point:
~ 1359.774 103.620
Area of streams before confluence:
1152.030 52.750
' Results of confluence:
Total flow rate = 1441.271(CFS)
Time of concentration = 30.223 min.
' Effective stream area after confluence = 1204.780(AC.)
End of computations, total study area = 1204.78 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
, Area averaged pervious area fraction(Ap) = 0.476
Area averaged RI index number = 62.9
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Trapezoidal Channel Analysis & Design
Open Channel - Unifoxm flow
Worksheet Name: TR 29798 / JN 32006
Comment: EXISTING COVERD CHANNEL @ LOMA LINDA
Solve For Discharge
Given Input Data:
Bottom Width.....
Left Side Sl.ope..
Right Side S~.ope.
Manning's n......
Channel Slope....
Depth............
Computed Results:
Discharge........
Velocity.........
Flow Area........
Flow Top Width...
Wetted Perimeter.
Critical Depth...
Critical Slope...
Froude Number....
12.00 ft
z.oo:i (x:v>
2.00:1 (H:V)
0.027
0.0082 ft/ft
4.10 ft
806.28
9.74
82.82
28.40
30.34
4.11
O.OOI
1.00
cfs
fps
sf
ft
ft
ft
31 ft/ft
(flow is Critical)
' Open Channel Flow Module, Version 3.43 (c) 1991
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
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Open Channel - Unifoxm flow
Worksheet Name: TR 30264 / JN 32006
Comment: EXIST. DBL 15'WX5'H RCB @ WOLF VALLY
Solve For Depth
Given Input Data:
Bottom Width..... 15.00 ft
Manning~s n...... 0.014
Channel Slope.... 0.010 7 ft/ft
Discharge........ 814.00 cfs
Computed Results:
Depth............ 2.98 ft
Velocity......... 18.2o fps
Flow Area........ 44.73 sf
Flow Top Width... 15.00 ft
Wetted Perimeter. 20.96 ft
Critical Depth... 4.51 ft
Critical Slope... 0.003 2 ft/ft
Froude Number.... 1.86 (flow is Supercritical)
Open Channel Flow Module, Version 3.43 (c) 1991
Haestad Methods, Inc. * 37 Brookside Rd * Waterbury, Ct 06708
855
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