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UNDEVELOPED HYDROLOGIC ANALYSIS
FOR WOLF VALLEY SPECIFIC PLAN
CITY OF TEMECULA
TRACT 29798 AND TRACT 30264
FEBRUARY 7, 2003
CASE I- HYDROLOGIC CALCULATIONS FOR
EXISTING CONDITIONS
NORTH HALF OF WOLF CREEK
(SOUTH HALF UNDEVELOPED)
~
ian S. Hovagimyan `A
No. 20278
Exp.33a05 *
Civil
~P
,~F CAUF~
PREPARED BY
:: Lohr + Associates Inc
Lend Plenning 43513 Ridge Park Drlve
Clvil Engineering Temecula CA 92590
Survayiny Ph.908676-6726 Fe:909699-0896
ATTENTION: HERMAN HOVAG~MYAN
TELEPHONE: (909) 676-6726
1
`~ LOHR+ASSOCIATESINC. . T~F?~jl~ ~ Tk'^~_'~!=
435 JOBNo. 3aaaG
13 RIDGE PARK DRIVE BY uFQ~~
7EMECULA,CA92590
-- DATE i2 /8 n~
; PH.909~76-6726
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fAX 909~99-0896 SHT. /
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~ ~ECeNO HYDROLOGIC SOILS GROUP MAP
-- SOII$ GROUP BOUNO~R~
• SOIL4 GROUP OESIGMATIOM FOR
R C F C~ W C D ~ PECHANGA ~
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LIMITATIONS~
1, Moximum lenqfh =1000 Feet
2. Ma:imum arsa + 10 Acr~a
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EXAMPLE~
5 ( i) L= 550~, H= 5.0~, K= Sinqle Family (5-7 Du/AC)
Development, Tc=12.6 mi~.
4 (2 ) L= 550~, H= 5.0~, K= Commercial
Devalopment, Tc=9.7 min.
SAN BERNARDINO COUNTY TIME OF corvcE
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- R UNOFF COEFFICIENT CURVES
SOIL GROUP-C
_ COVER TYPE-URBAN LANDSCAPING
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AMC-II
(RUN
OFF INDEX NUMBER 69)
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Riverside County Rational Hydrology Program
~ CIVILCADD/CIVILDSSIGN Sngineering Software,(c) 1989 - 2001 Version 6.4
________Rational Aydrology Study ___-___Date:_02/06/03 File:264SX.out
~ ---------------------- ------------------------
TR 30264 BXISTING CONDITION INCLUDING OFF-SITES
100 Y8AI2 STORM
JN 32006
~ ------------------------------------------------
------------------------
********* HydrOlogy Study COntr01 InfOZmatiOn +*++******
~: Englieh (in-lb) Units used in input data file
~ --------------------------------------------
----------------------------
Lohr & Asaociates, Inc., Temecula, CA - S/N 773
------------------------------------------------=-
---------------------
Rational Method Hydrology Program based on
~ Rivereide County Flood Control & Water Consexvation Diatrict
1978 hydrology manual
Stozm 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 stoxm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute inteneity ~ 0.880(In/Hr)
100 year storm 10 minute inteneity = 3.480(In/Hr)
~ 100 year storm 60 minute inteneity = 1.300(In/Hr) °~
Stoxm event year = 100.0
Calculated rainfall intensity data:
~, 1 hour intensity = 1.300(In/Hr) J-
Slope of intensity duration curve = 0.5500
~
~ ++++++++++++++++++++++++++++++++++++++++++++t+++++++++++++++++++++++++
- Process from Point/Station 100.000 to Point/Station 101.000
***• INITIAL ARSA SVAI,UATION ****
~ Initial area flow diatance = 1000.000(Ft.)
Top (of initial area) elevation = 1148.000(Ft.)
Bottom (of initial area) elevation = 1130.300(Ft.)
~' Difference in elevation = 17.700(Ft.)
Slope = 0.01770 s(percent)= 1,~7
~ 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 etorm
UNDSVSLOPSD (poor cover) aubarea
Runoff Coefficient = 0.781
~ Decimal fraction soil group A a 0.000
Decimal fraction soil group B= 1.000
Decimal fr
~ action soil 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 ti~
Zo 2
Initial subarea runoff = 19.200(CFS)
Total initial stream area = 10.000(AC.)
Pervioue area fraction = 1.000
~
~ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~++
Procesa from Point/Station 101.000 to Point/Station 102.000
**** NATURAL CHANNSL TIM$ + SUBARSA FLOW ADDITION ***~
~ Top of natural channel elevation = 1130.300(Ft.)
find of natural channel elevation = 1115.000(Ft.)
Length of natural channel = 980.000(Ft.)
, Estimated meaa flow rate at midpoint of channel = 37.440(CFS)
~ Natural valley channel type used
~ L.A. County flood control district foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 4.45(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalle (Plate D-6.2)
Nozmal channel slope = 0.0156
~ Corrected/adjusted channel slope = 0.0156
Travel time = 3.67 min. TC = 22.g9 min.
~ Adding area flow to channel
UNDEVSLOPBD (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 etorm
~ Subarea runoff = 32.632(CFS) for 19.000(Ac.)
Total runoff = 51.832(CFS) Total area = 29.000(Ac.)
+++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 102.000 to Point/Station i03.000
*''+* N3~,T~1RA1+ CHANNSL TIMS + SUBARSA FLOW ADDITION t***
~ Top of natural channel elevation = 1115.000(Ft.)
$nd of natural channel elevation = 1100.500(Ft.)
Length of natural channel = 1020.000(Ft.)
~ Estimated mean flom rate at midpoint of channel = 67.203(CFS)
Natural valley channel type used
~ L.A. County flood control dietrict foxmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(gnglish Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.03(Ft/s)
Correction to map slope used on extremely rugged channels mith
drops and waterfa118 (Plate D-6.2)
Normal channel slope = 0.0142
~ Corrected/adjusted channel slope = 0.0142
Travel time = 3.38 min. TC = 25.8'7 min.
~ ~~
~
~
~
~
~
Adding area flow to
UNDSVSLOPED (poor cove
Runoff Coefficient = 0
Decimal fraction soil
channel _
r) subarea
.761
group A = 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction eoil group D= 0.000
RI index for soil(AMC 2) = 78,00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intensity = 2.065(In/Hr) for a 100.0 year stoxm
Subarea runoff = 27.039(CFS) for 17:200(AC.)
Total runoff = 78.870(CFS) Total area = 46.200(Ac.)
Zo3
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 107.000
**** NATURAL CHANNBL TIMB + SUBAREA FLOW ADDITION +***
Top of natural channei elevation = 1100.500(Ft.)
Bnd of natural channel elevation = 1095.800(Ft.)
Length of natural channel = 420.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 79.297(CFS)
Natural valley channel type used
L.A. County flood control diatrict formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(gnglish Units)".352)(slope"0.5)
Velocity using mean channel flom = 4.69(Ft/s)
~ Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0112
~ Corrected/adjusted channel slope = 0.0112
Travel time = 1.49 min. TC = 27.36 min.
~
~~
~
~
~
Adding area flow to
UND$VBLOPSD (poor cov
Runoff Coefficient =
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fractio
Rainfall intenaity =
Subarea runoff =
Total runoff = 79.
channel
er) subarea
0.758
group A = 0.000
group B = 1.000
group C =.0.000
group D = 0.000
2) = 78.00
n = 1.000; Impervious fraction
2.002(In/Hr) for a 100.0
0.758(CFS) for 0.500(Ac.)
629(CFS) Totai area = 46
= 0.000
year storm
700(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUSNCB OF MINOR STRfiAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 46.700(AC.)
Runoff from this stream = 79.629(CFS)
Time of concentration = 27.36 min.
Rainfall intensity = 2.002(In/Hr) `Z
~ 2a ~p
++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 104.000 to Point/Station 105.000
*+** INITIAL ARBA SVALUATION ****
Initial area flow distance = 785.000(Ft.)
~ Top (of initial ares) elevation = 1147.000(Ft.)
Bottom (of initial area) elevation = 1133.OOOtFt.)
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 storni
UNDEV$LOPSD (poor cover) subarea
Runoff Coefficient = 0.786
Decimal fractipn soil group A= 0.000
~, Decimal fraction soil group B= 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
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++t+++++++++++++
ProCess from Point/Station 105.000 to Point/Station 106.000
`*** NATURAL CHANNSL TIMB + SUBARIIA 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.)
8stimated 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(Snglish Units)".352)(slope"0.5)
Velocity ueing 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 slope = 0.0145
Travel time = 4.75 min. TC = 21.81 min.
~ Adding area flow to channel
UNDSVBLOPSD (poor cover) aubarea
Runoff Coefficient = 0.772
~ 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 = 2.268(In/xr) for a 100.0 year storm
Subarea runoff = 21.013(CFS) for 12.000(Ac.)
Total runoff = 41.423(CFS) Total area = 22.000(AC.)
~ `3
~ Zo5
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 106.000 to Point/Station 107.000
**** NATURAL CHANNBL TIMS + SUBARBA 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.)
~ Batimated mean flow rate at midpoint of channel = 50.366(CFS)
__. Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q($nglieh Units)".352}(slope"0.5)
_ Velocity using mean channel flow = 4.91(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0160
Corrected/adjusted channel alope = 0.0160
,~ Travel time = 4.28 mi.n. TC = 26.08 min.
~ Adding area flow to channel
UNDHVSIAP~ (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; Impervioue fraction = 0.000
Rainfall intensity = 2.056(In/Hr) for a 100.0 year etoxm
~ Subarea runoff = 14.857(CFS) for 9.500(AC31.500(Ac.)
Total runoff = 56.279(CFS) Total area =
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 107.000 to Point/Station 107.000
**** CONFLUSNCB OF MINOR STRBAMS ****
~: Along Main Stream number: 1 in norn~al stream number 2
Stream flow area = 31.500(Ac.)
Runoff from thie stream = 56.2'79(CPS)
~ Time of concentration = 26.08 min.
Rainfall intenaity = 2.056(In/Hr)
Summary of stream data:
~ Stream Flow rate TC Rainfall Intensity
No. (CFS) (min) (In/Hr)
, 1 79.629 27.36 2.002
2 56.279 26.08 2.056
~ L~argest stream flow has longer time of concentration
79.629 + sum of
Qb Ia/ib
~ 56.279 * 0.974 = 54.815
Qp = 134.443
~ Total of 2 streams to confluence: ~
20~
1 Flow rates before confluence point:
79.629 56.279
~ Area of etreams before confluence:
46.700 31.500
Resulta of confluence:
~ Total flow rate = 134.443(CFS)
Time of concentration = 27.365 min.
Effective atream area after confluence = 78.200(AC.)
I ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process•from Point/Station 107.000 to Point/Station 110.000
~ **** NATt7RAL CHANNSL TIMS + SUBARSP, FLOW ADDITION ****
Top of natural channel elevation = 1095.800(Ft.)
~ Snd of natural channel elevation = 1067.500(Ft.)
Length of natural channel = 910.000(Ft.)
Betimated 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(Bngliah Units)".352)(slope"0.5)
~ Velocity using mean channel flow = 5.06(Ft/s)
Correction to map slope used on extremely rugged channela with
drops and waterfalls (Plate D-6.2)
~ Normal channel slope = 0.0091
Corrected/adjusted channel alope = 0.0091
Travel time = 3.00 min. TC = 30.36 min.
~ Adding ares flow to channel
, UNDEVSLOPED (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 eoil(AMC 2) = 78.00
Pervious area fraction a 1.000; Impervious fraction = 0.000
~; Rainfall intensity = 1.891(In/Hr) for a 100.0 year storni
Subarea runoff = 15.614(CFS) for 11.000(Ac.)
Total runoff ~ 150.057(CFS) Total area = 89.200iAC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Proceae from Point/Station 110.000 to Point/Station 110.000
**i* CONFLUSNCB OF MINOR STRSAMS ****
' Along Main Stream number: 1 in normal stream number 1
Stream flom area = 89.200(AC.)
Runoff from thie stream = 150.057(CFS)
Time of concentration = 30.36 min.
~ Rainfall intensity = 1.891(in/Hr)
1 ++~+++++++++++++++++++++++t+++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA SVALUATION *+**
~ ~'~
~ Zo8
Along Main Stream number: 1 in noz~aal stream number 2
Stream flow area = 15.500(Ac.)
~ Runoff from this stream = 30.081(CFS)
Time of concentration = 21.46 min.
Rainfall inteneity = 2.289(In/Hr)
~ Su~nary of stream data:
Stream Flom rate TC Rainfall intenaity
No. (CFS) (min) (In/Hr)
1 150.057 30.36 1.891
I 2 30.081 21.46 2,2g9
L~argest stream flow hae longer time of concentration
150.057 + sum of
~ Qb Ia/ib
30.081 * 0.826 = 24.853
Qp = 174.910
~ Total of 2 streama to confluence:
Flow rates before confluence point:
150.057 30.081
~ Area of streame before confluence:
89.200 15.500
Results of confluence:
' Total flow rate = 174.910(CPS)
Time of concentration = 30.362 min.
Bffective stream area after confluence = 104.700(AC.)
~ +++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 110.000 to Point/Station 123.000
'*+* NATURAI, CHANNBL 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(English Units)".352)(slope"0.5)
velocity using mean channel flow = 4.44(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
~ Normal channel elope = 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
Decimal fraction soil
Decimal fraction soil
~ Decimal fraction soil
RI index for soil(AMC
~ Pervious area fraction
group A = 0.000
group B = 1.000
group C = 0.000
group D = 0.000
2) = 78.00
= 1.000; Impervious
fraction = 0.000 tr
v~
2a9
~' 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.)
II ~ +++++++++++++++++++t++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 123.000 to Point/Station 123.000
*~** CONFLUSNCB OF MAIN STR$AMS ****
~ The following data inaide Main Stream is listed:
In Main Stream number: 1
Stream flow area = 122.500(Ac.)
~ Runoff from this stream = 198.907(CFS)
Time of concentration = 32.89 min.
Rainfall intenaity = 1.809(In/Hr)
~ Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 111.000 to Point/Station 112.000
**** INITIAL ARSA SVALUATION ****
~ Initial area flom 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 concentratioa = 14.668 min.
~ Rainfall intensity = 2.821(In/Hr) for a 100.0 year etorm
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.815
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group S= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 82.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff = 23.004(CFS)
~ Total initial stream area = 10.000(Ac.)
Pezvious area fraction = 1.000
~ +++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 112.000 Co Point/Station 113.000
~*** NATURAL CHANNBL TIMB + SUBARSA FLOW ADDITION ****
~ Top of natural channel elevation = 1135.300(Ft.)
End of natural channel elevation = 1122.800(Ft.)
' Length of natural channel = 810.000(Ft.)
Estimated mean flow rate at midpoint of channel = 44.858(CFS)
, Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Unita)".352)(slope"0.5)
Velocity using mean channel flom = 4.66(Ft/s)
~ Correction to map slope used on extremely rugged channele with
drops and waterfalis (Plate D-6.2) ~-~,
~ Noxmal channel slope = 0.0154
~ zto
Corrected/adjuated channel alope = 0.0154
Travel time = 2.90 min. TC = 17.56 min.
r
Adding area flow to channel
~ UNDSVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.80'l
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 soiltAMC 2) = 82.00 ~
~. Pexvious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 2.555(In/Hr) for a 100.0 year stozm
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 CHANNSL TIMB + SUBAREA FLOW ADDITI013 ***~
~ Top of natural channel elevation = 1122.800(Ft.)
Bnd of natural channel elevation = 1111.000(Ft.)
Length of natural channel = 1050.000(Ft.)
~ Esstimated mean flow rate at midpoint of channel = 82.580(CFS)
Natural valley channel type used
L.A. County flood control district foxmula for channel velocity:
~ Velocity(ft/s) _ (7 + 8(q(8nglieh Units)".352)(aiope"0.5)
Velocity using mean channel flom = 4.75(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Nornial channel slope = 0.0112
~ Corrected/adjusted channel alope = 0.0112
Travel time = 3.68 min. TC = 21.25 mia.
~ Adding area flow to channel
UND$VBLOP$D (poor cover) subarea
Runoff Coefficient = 0.774
~ Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
_ Decimai fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
~ RI index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impexvious fraction = 0.000
Rainfall intensity = 2.301(In/Hr) for a 100.0 year atoxm
~ Subarea runoff = 33.820(CFS) for 19.000(Ac.)
Total runoff = 96.023(CFS) Total area = 48.000(Ac.)
~ +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++~
Process from Point/Station 114.000 to Point/Station 114.000
**** CONFLUBNCS OF MINOR STRBAMS ****
~ Along Main Stream number: 2 in noxmal etream number 1
Stream flow area = 48.000(Ac.)
~ Runoff from this atream = 96.023(CFS) ~
Z 1~
~ Time of concentration = 21.25 min.
Rainfall intensity = 2.301(In/Hr)
'
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Process from Point/Station 115.000 to Point/Station 115.000
*~** USSR DBFINED FLOW INFORMATION AT A POINT ****
~ Rainfall intensity = 2.017(In/Hr) for a 100.0 year storm
UNDSVSLOPBD (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 CHANNSL TRAVSL TIMB ****
' Upstream point elevation = 1133.000(Ft.)
Downatream point elevation = 1306.500(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
~ Sstimated mean flow rate at midpoint of channel = 677.272(CFS)
Manning~a 'N' = 0.030
Maximum depth of channel = 7.000(Ft.)
Flow(q) thru subarea = 677.272(CFS)
~ Depth of flow = 3.319(Ft.), Average velocity = 9.442(Ft/s)
Channel flow top width = 33.230(Ft.)
Flow Velocity = 9.44(Ft/s)
~ Travel time = 3.46 min.
Time of concentration = 30.46 min.
~ Sub-Channel No. 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
UNDSVBLOPSD (poor cover) subarea
' Runoff Coefficient = 0.782
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.450
Decimal fraction soil group C= 0.550
, Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.40
Pervious area fraction = 1.000; Impervious fraction = 0.000
~ Rainfall intensity = 1.887(In/Hr) for a 100.0 year etorm
Subarea runoff = 29.815(CFS) for 20.200(Ac.)
Total runoff = 692.815(CFS) Total area = 489.400(AC.) p~
~ Yv
2l2
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Proceas from Point/Station 116.000 to Point/Station 116.000
**** CONFLUSNCS OF MINOR STREAMS ***•
, Along Main Stream number: 2 in normal stream number 2
Stream flow area = 489.400(Ac.)
Runoff from this atream = 692.815(CFS)
Time of concentration = 30.46 min.
' Rainfall intensity = 1.887(In/Hr)
Summa=y of stream data:
' Stream Flow rate TC Rainfall intenaity
No. (CFS) (min) (In/Hr)
LJ
~
1
2
Largest
4P =
4P
96.023 21.25
692.815 30.46
2.301
1.887
time of concentration
~
~
~
,
~
~
~
'
,
~
stream flow has longer
692.815 + sum of
Qb Ia/Ib
96.023 * 0.820 =
771.580
78.765
Total of 2 streams to confluence:
Flom ratea before confluence point:
96.023 692.815
Area of streams before confluence:
48.000 489.400
Reaults of confluence:
Total flow rate = 771.580(CFS)
Time of concentration = 30.460 min.
Effective etream area after confluence = 537.400(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceae from Point/Station 116.000 to Point/Station 123.000
**** IMPROV~ CHANNSL TRAVSL TIMB ****
Upatream point elevation = 1106.500(Ft.)
Downatream 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
8etimated mean flow rate at midpoint of channel = 779.046(CFS)
Manning'e '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 midth = 64.988(Ft.)
Flom 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 flom velocity= 7.259(Ft/s)
~ ~ ' Critical flow area = 107.320(Sq.Ft)
~
"L(3
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 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 = 1.751(In/Hr) for a 100.0 year etorm
Subarea runoff = 13.490(CFS) for 10.400(Ac.)
Total runoff = 785.070(CFS) Total area = 547.800(AC.)
Adding area flow to channel
UNDSVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.741
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Process from Point/Station 123.000 to Point/Station 123.000
* *+* CONFLiJSNC$ OF MAIN STR.SAMS * * * *
The following data inside Main Stream is liated:
, In Main Stream number: 2
Stream flow area = 547.800(AC.)
Runoff from this atream = 785.070(CFS)
~ Time of concentration = 34.92 min.
Rainfall intensity = 1.751(In/Hr)
Program is now atarting with Main Stream No. 3
~
~
~
~
~
~
~
~
~
,
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 117.000 to Point/Station 117.000
**** USSR DSFINSD FLOW INPORMATION AT A POINT **+'•
Rainfall intensity = 2.617(In/Hr) for a 100.0 year etozm
SINGLS 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 apecified valuea are as follows:
TC = 16.82 min. Rain intensity = 2.62(In/Hr)
Total area = 62.70(AC.) Total runoff = 129.00(CFS)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceae from Point/Station 117.000 to Point/Station 118.000
+~** NATURAL CHANNSL TIMS + SUBARSA 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.)
Eatimated 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(8nglish Units)".352)(slope"0.5)
Velocity ueing mean channel flow = 7.68(Ft/s)
~ Correction to map slope uaed on extremely rugged channels with ~,
z~~
, drope and waterfalls (Plate D-6.2)
Normal channel elope = 0.0215
, Corrected/adjusted channel slope = 0.0215
Travel time = 1.71 min. TC = 18.53 min.
, Adding area flow to channel
UNDSVSLOPBD (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 atorm
Subarea runoff = 17.447(CFS) for 9.000(Ac.)
Total runoff = 146.447(CFS) Total area = 71.700(AC.)
~ +++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++++++
Procesa from Point/Station 118.000 to Point/Station 121.000
, **** NATURAL CHANNSL TIMB + SIIBARSA FLOW ADDITION **+*
Top of natural channel elevation = 1101.000(Ft.)
~ Snd of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 980.000(Ft.)
Sstimated mean flow rate at midpoint of channel = 156.251(CFS)
~ Natural valley channel type used
L.A. County flood control district formula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(8nglieh Unita)".352)(slope"0.5)
' Velocity using mean channel flow = 5.63(Ft/s)
Correction to map elope used on extremely xvgged channele with
drops and waterfalla (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
, UNDSV8LOP8D (poor cover) subarea
Runoff Coefficient = 0.773
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
, Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 78.00
' Pervious area fraction = 1.000; impervious fraction = 0.000
Rainfall intensity = 2.290(In/Hr) for a 100.0 year stoxm
Subarea runoff = 16.992(CPS) for 9.600(Ac.)
Total runoff = 163.439(CFS) Total area = 81.300(Ac.)
~
++++++++++++++++++++++++++++++++++++++++++++++++++++f+++++++++++++++++
~ Process from Point/Station 121.000 to Point/Station 121.000
**** CONFLUSNCB OF MINOR STRBAMS ****
' Along Main Stream number: 3 in normal stream number 1 2~
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)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 119.000 to Point/Station 120.000
**** INITIAL ARBA 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 inteneity = 3.086(In/Hr) for a 100.0 year etorm
SINGLS FAMILY (1 Acre Lot)
' Runoff Coefficient = 0.718
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 a 0.000
RI index for soiliAMC 2) ffi 56.00
~ Pervious area fraction = 0.800; Impervious fraction = 0.200
Initial subarea runoff = 7.085(CFS)
Total initial stream area = 3.200(Ac.)
Pervioua area fraction = 0.800
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Proceae from Point/Station 120.000 to Point/Station 121.000
**** NATURAL CHANNSL TIMS + SUBARfiA FLOW ADDITION •**•
Top of natural channel elevation = 1094.000(Ft.)
' Snd of natural channel elevation = 1090.500(Ft.)
Length of natural channel = 560.000(Ft.)
$stimatefl mean flow rate at midpoint of channel = 9.520(CFS)
, Natural valley channel type used
L.A. County flood control district formula for channel velocity:
' Velocity(ft/s) _ (7 + 8(q(Bnglish Units)".352)(slope"0.5)
Velocity using mean channel flom = 1.95(Ft/s)
Correction to map slope ueed on extremely rugged channels with
' drops and waterfalla (Plate D-6.2)
Normal channei slope = 0.0063
Corrected/adjuated channel slope = 0.0063
~ 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
, Decimal fraction soil group B= 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.)
21~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++~+++++++++++++
Process from Point/Station 121.000 to Point/Station 121.000
•*** CONFLUBNCB OF MINOR STREAMS ****
Along Main Stream number: 3 in normal atream number 2
Stream flow area = 5.400(AC.) •
Runoff from this etream = 11.545(CFS)
Time of concentration = 17.25 min.
Rainfall inteneity = 2.581(In/Hr)
Suartnary of stream data:
Stream Flow rate TC
No. (CFS) (min)
Rainfall Intensity
(In/Hr)
1 163.439 21.44 2.290
2 11.545 17.25 2.581
L~argest stream flow has longer time of concentration
163.439 + sum of
Qb Ia/ib
11.545 * 0.887 = 10.243
Qp = 173.682
Total of 2 streams to confluence:
Flom ratea before confluence point:
163.439 11.545
Area of atreams before confluence:
81.300 5.400
Resulte of confluence:
Total flow rate = 173.682(CFS)
Time of concentration = 21.438 min.
Sffective stream area after confluence = 86.700(Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 121.000 to Point/Station 122.000
**** NATURAL CHANNSL TIMB + SUBAREA FLOW ADDITION *t+•
Top of natural channel elevation = 1090.500(Ft.)
Snd of natural channel elevation = 1087.100(Ft.)
Length of natural channel = 740.000(Ft.)
Bstimated mean flow rate at midpoint of channel = 192.512(CPS)
Natural valley channel type used
L.A. County flood control district forn~ula 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/adjueted channel slope = 0.0046
Travel time = 3.14 min. TC = 24.58 min.
za
, Z~~
, Adding area flow to channel
UNDSVBLOPED (poor cover) subarea
Runoff Coefficient = 0.765
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
Pervious area fraction = 1.000; Impezvious fraction = 0.000
Rainfall intensity = 2.124(In/Hr) for a 100.0 year storm
' Subarea runoff = 30.531(CFS) for 18.800(AC.)
Total runoff = 204.212(CFS) Total area = 105.500(Ac.)
' ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 123.000
* rr++ Np,Tf7g,AL CHANNgL TIN~ + SUBAR$P, FLOW ADDITION ****
' Top of natural channel elevation = 1087.100(Ft.)
Snd of natural channel elevation = 1083.500(Ft.)
Length of natural channel = 1360.000(Ft.)
' Bstimated mean flow rate at midpoint of channel = 213.310(CFS)
Natural valley channel type used
' L.A. County flood control district fozmula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(8nglish Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.08(Ft/s)
, Correction to map slope used on extremely rugged channels with
drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0026
~ Corrected/adjusted channel slope = 0.0026
Travel time = 7.36 min. TC = 31.94 min.
' Adding area flow to channel
UNDEVBLOP~ (poor cover) aubarea
Runoff Coefficient = 0.747
' Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D= 0.000
RI index for soiltAM1C 2) 78.00
Pervious area fraction = 1.000; is~ervious fraction = 0.000
~ Rainfall intensity = 1.839(In/Hr) for a 100.0 year storm
Subarea runoff = 12.915(CFS) for 9.400(AC.)
Total runoff = 217.127(CFS) Total area = 114.900(AC.)
' +++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++++++++++
Proceas from Point/Station 123.000 to Point/Station 123.000
' **** CONFLUSNCB OF MAIN STR$AMS ****
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 inteneity = 1.839(Ia/Hr)
'
,
~I
J
'
~
~
C
~
~
1
~
,
~
,
,
,
,
~
~
_ . ___ _
2~$
Summary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1 198.907 32.89
2 785.070 34.92
3 217.127 31.94
Largest stream flow has longer
Qp = 785.070 + sum of
Qb Ia/ib
198.907 * 0.968 =
Qb Ia/ib
217.127 * 0.952 ~
Qp = 1184.275
Rainfall Intensity
(In/Hr)
1.809
1.751
1.839
time of concentration
192.474
206.'732
Total of 3 main streame to confluence:
Flow rates before confluence point:
198.907 785.070 217.127
Area of etreams before confluence:
122.500 547.800 114.900
Reaults of confluence:
Total flow rate = 1184.275(CFS)
Time of concentration = 34.920 min.
Bffective stream area after confluence = 785.200(Ac.)
++++++++++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++
Proces8 from Point/Station 123.000 to Point/Station 129.000
**~* IMPROVBD CHANNSL TRAVBL TIMB ****
Upstream point elevation = 1083.500(Ft.)
Downstream point elevation ~ 1061.500(Ft.)
Channel length thru subarea = 910.000(Ft.)
Channel base width = 4.000(Ft.)
Slope or 'Z' of left channel barrk = 2.000
Slope or 'Z' of right channel bank = 2.000
8stimated mean flow rate at midpoint of channel = 1186.915(CFS)
Manning's 'N' m 0.030
Maximum depth of channel = 10.000(Ft.)
Flow(q) thru subarea = 1186.915(CFS)
Depth of flow = 5.310(Pt.), Average velocity = 15.291(Ft/s)
Channel flOw tOp width = 25.238(Ft.)
Flow Velocity = 15.29(Ft/s)
Travel time = 0.99 min.
Time of concentration = 35.91 min.
Sub-Channel No. 1 Critical depth = 6.438(Ft.)
~ ~ ~ Critical flow top width = 29.750(Ft.)
~ ~ ~ Critical flow velocity= 10.926(Ft/s)
~ ~ ' Critical flow area = 108.633(Sq.Ft)
Adding area flow to channel
UNDBVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.739
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
~
z~y
Decimal fraction soil
Decimal fraction soil
RI index for soil(AMC
Pervious area fraction
Rainfall intensity =
Subarea runoff =
Total runoff = 1188.
group C = 0.000
group D = 0.000
2) = 78.00
= 1.000; Impervious fraction = 0.000
1.724(In/Hr) for a 100.0 year storni
4.458(CFS) for 3.500(AC.)
734(CFS) Total area = 788.700(AC.)
+++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procese from Point/Station 129.000 to Point/Station 129.000
*'** CONFLUSNCB OF MAIN STRBAMS ****
The followi
In Main Str
Stream flow
g data inside Main Stream is lie
am number: 1
area = 788.700(Ac.)
Runoff from this stream = 1188.734(CFS)
Time of concentration = 35.91 min.
Rainfall intenaity = 1.724(In/Hr)
Program is now etarting with Main Stream No. 2
+++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 119.000 to Point/Station 124.000
•*** INITIAL ARBA SVALUATION ****
Initial area flow dietance = 860.000(Ft.)
Top (of initial area) elevation = 1160.000(Ft.)
Eottom (of initiai area) elevation = 1088.o0o(Ft.>
Difference in elevation = 72.000(Pt.)
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 stoxm
UNDRVfiLOPSD (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
RS index for soil(AMC 2) = 78.00
Pervious area fraction = 1.000; Impervious fraction = 0.000
Initial subarea runoff a 7.724(CFS)
Total initial stream area = 3.200(AC.)
Pervious area fraction = 1.000
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 124.000 to Point/Station 125.000
**** IMPROVSD CHANNSL TRAVSL TIMB *+**
Upstream point elevation = 1088.000lFt.)
Downetream point elevation = 1079.000(Ft.)
Channel length thru subarea = 390.000(Ft.)
Channel base width = 17.000(Pt.)
Slope or ~Z' of left channel bank = 2.000
Slope or 'Z' of right channel bank = 5.000
8etimated mean flow rate at midpoint of channel = 8.690(CFS)
Manning's 'N' = 0.030 ~-~
Maximum depth of channel = 1.000(Ft.)
i ~°
Flow(q) thru subarea = 8.690(CFS)
~ Depth of flom = 0.198(Ft.), Average velocity = 2.484(Ft/s)
Channel flow top width = 18.384(Ft.)
FlOw Velocity = 2.48(Ft/s)
Travel time = 2.62 min.
Time of concentration = 15.60 min.
, Sub-Channel No. 1 Critical depth = 0.199(Ft.)
, ' ' ' Critical flow top width = 18.395(Ft.)
~ ' ~ Critical flow velocity= 2.465(Ft/s)
' ' ' Critical flow area = 3.526(Sq.Ft)
, Adding area flow to channel
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.791
, Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
1 Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) 78.00
Penrious area fraction = 1.000; Impezvious fraction = 0.000
Rainfall intensity = 2.727(in/Hr) for a 100.0 year atozm
, Subarea zunoff.= 1.725(CFS) for 0.800(AC.)
Total runoff = 9.450(CFS) Total area = 4.000(Ac.)
, ++++++~+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 125.000 to Point/Station 125.000
**** CONFLUSNCS OF MINOR STRSAMS ****
, Along Main Stream number: 2 in nozmal 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)
' +++++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++
Proceae from Point/Station 125.000 to Point/Station 125.000
, **** USSR DBFINBD FLOW INFORMATION AT A POINT ****
Rainfall intenaity = 2.104(In/Hr) for a 100.0 year storm
' SINGLB FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
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 xunoff = 293.20(CFS)
+++++++++++++++++++++~++++++++++++++++++++++++++++++++++++t++++t++++++
' Procesa from Point/Station 125.000 to Point/Station 125.000
**** CONFLUBNCB OF MINOR STRBAMS ****
' Along Main Stream number: 2 in normal stream number 2 ~
~
,
,
1
'
~
'
,
'
~
'
1
,
'
'
'
'
'
'
Stream flow area = 118.000(Ac.)
Runoff from this stream = 293.200(CFS)
Time of concentration = 25:00 mia.
Rainfall intensity = 2.104(Yn/Hr)
Sunrtnary of stream data:
Stream Flow rate TC
No. (CFS) (min)
1
2
Largest
QP =
QP
Rainfall Zntensity
(In/Hr)
9.450 15.60 2.727
293.200 25.00 2.104
stream flow has longer time of concentration
293.200 +
Qb
9.450
300.492
sum of
Ia/Ib
0.772 =
7.292
Total of 2 streams to confluence:
Flow rates before confluence point:
9.450 293.200
Area of etreams before confluence:
4.000 118.000
Results of confluence:
Totai fiow rate = 300.492(CFS)
Time of concentration = 25.000 min.
Bffective stream area after confluence = 122.000(AC.)
22~
+++++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++++++++++
Procesa from Point/Station 125.000 to Point/Station 126.000
**** IMPROVSD CHANNBL TRAVSL TIMB ****
Upatream 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 midpoint of channel = 319.211(CFS)
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 = 5.561(Ft/s)
Channel flow top width = 32.532(Ft.)
Flow Velocity = 5.56(Pt/s)
Travel time = 2.61 min.
Time of concentration = 27.61 min.
Sub-Channel No. 1 Critical depth = 2.656(Ft.)
' ~ ' Critical flow top width = 28.906(Ft.)
' ' ' Critical flow velocity= 7.089(Ft/e)
' ~ ~ Critical flow area = 45.032(Sq.Ft)
Adding area flow to channel
UNDEVfiLOPBD (poor cover) aubarea
Runoff Coefficient = 0.757
Decimal fraction soil group A= 0.000
Decimal fraction eoii group B= 1.000
Decimal fraction soil group C= 0.000 Z~
~
'
'
~
'
'
C'
'
,
222
Decimal fraction soil
RI index for soil(AMC
Pervious area fractio
Rainfall intensity =
Subarea runoff =
Total runoff = 323
group D = 0.000
2) = 78.00
n= 1.000; Impervious fraction = 0.000
1.992(In/Hr) for a 100.0 year storm
22.927(CFS) for 15.200(Ac.)
.419(CFS) Total area = 137.200(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 126.000 to Point/Station 127.000
**** IMPROVSD CHANNSL TRAVBL TIMB ****
Upstream point elevation = 1073.700{Ft.)
Downstream point elevation = 1072.300(Ft.)
Channel length thru subarea = 590.000(Ft.)
Channel base width = 5.000(Ft.)
Slope or ~Z~ of left channel bank = 3.000
Slope or 'Z' of right channel bank = 6.000
Bstimated mean flow rate at midpoint of channel = 341.099(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.)
Flow(q) thru subarea = 341.099(CFS)
Depth of flow = 3.846(Ft.), Average velocity ~ 3.976(Ft/s)
Channel flow top width = 39.613(Ft.)
Flow Velocity = 3.98(Ft/s)
Travel time = 2.47 min.
Time of concentration = 30.08 min.
' Sub-Channel No. 1 Critical depth =
~ ~ ' Critical flow
~ ~ ~ Critical flow
~ ' ' Critical flow
'
'
'
'
'
,
,
~
'
29.750(Ft.)
7.139(Ft/s)
.781(Sq.Ft)
Adding area flow to channel
UNDBVELOPSD (poor cover) aubarea
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 storm
Subarea runoff = 21.418(CFS) for 15.000(A152.200(AC.)
Total runoff = 344.837(CFS) Total area =
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 127.000 to Point/Station 128.000
**** IMPROVBD CHANNBL TRAVSL TIMB ****
Upatream 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
Sstimated mean flom rate at midpoint of channel = 359.564(CFS)
Manning's 'N' = 0.030
Maximum depth of channel = 6.000(Ft.) ~
2.750(Ft.)
top width =
velocity=
area = 47
~
~
'l
ll
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 = 60.156(Ft.)
' ' ' Critical flow velocity= 5.252(Ft/s)
~ ~ ~ Critical flow area = 68.466(Sq.Ft)
, Adding area flow to channel
UNDSVBLOPSD (poor cover) subarea
Runoff Coefficient = 0.745
, Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 1.000
Decimal fraction soil group C= 0.000
' Decimal fraction soil group D e 0.000
RI index for soil(AMC 2) 78.00
Pervious area fraction = 1.000; Impervioue fraction
Rainfall intenaity = 1.810(In/Hr) for a 100.0
~ Subarea runoff = 17.538(CFS) for 13.000(AC.)
Total ninoff = 362.376(CFS) Total area = 165
,
'
'
'
'
'
~
'
~
r-
~
L~
~I,
y
= 0.000
year atoxm
200(AC.?
?23
++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++~+++++
Process from Point/Station 128.000 to Point/Station 129.000
**** IMPROVSD CHANNSL TRAVBL TIMS ****
Upstream point elevatioa = 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 aubarea = 377.731(CFS)
Depth of flow = 2.986(Ft.), Average velocity = 7.920(Ft/s)
Channel flow top width = 21.944(Ft.)
Fiow Velocity = 7.92(Ft/e)
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 flow area = 45.955(Sq.Ft)
Adding area flow to channel
UNDBVBLOPBD (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 3~
~ 27~(.
Rainfall intenaity = 1.764(In/Hr) for a 100.0 year storm
~ Subarea runoff = 18.324(CFS) for 14.000(AC.)
Total runoff = 380.700(CFS) Total area = 179.200(AC.)
' ~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
**** CONFLUBNCS OP MAIN STRBAMS *t**
~ 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 inteneity = 1.764(In/Hr)
~ Program ie now starting with Main Stream No. 3
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 129.000 to Point/Station 129.000
**** USER DBFINSD FIAW INFORMATION AT A POINT **+*
~ Rainfall intensity = 2.787(In/Hr) for a 100.0 year stoxm
COrM~IBRCiAL subarea type
Runoff Coefficient = 0.875
~ Decimal fraction eoil group A a 0.000
Decimal fraction soil group B a 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 = 0.300; Impervious fraction = 0.900
User specified valuea are as follows:
~ TC = 15.00 min. Raia inteneity = 2.79(In/Hr)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 129.000 to Point/Station 129.000
*t** CONFLUBNCS OF MAIN STRBAMS ***+
~ The following data inaide Main Stream is lieted:
In Main Stream number: 3
~ Stream flow area = 87.000(AC.)
Runoff from this stream s 108.000(CPS)
Time of concentration = 15.00 min.
~ Rainfall inteneity = 2.787(In/Hr)
Summazy of stream data:
Stream Flow rate TC Rainfall Intenaity
~ No. (CFS) (min) (In/Hr)
~ 1 1188.734 35.91 1.724
2 380.700 34.44 1.764
3 108.000 15.00 2,7g7
~ L~argest etream flow hae longer time of concentration
= 1188.734 + sum of
Qb Ia/Ib
380.700 * 0.977 = 372.013
~ Qb Ia/Ib ~?/
Total area = 87.00(AC.) Total runoff = 108.00(CFS)
II ~ 108.000 * 0.619 = 66.817
' Qp = 1627.564
Total of 3 main streams to confluence:
Flow rates before confluence point:
I ' 1188.734 380.700 108.000
Area of atreams before confluence:
788.700 179.200 87.000
' Results of confluence:
I' Total flow rate = 1627.564(CFS) _
Time of concentration = 35.912 min.
Bffective_atream area after confluence 1054.900(AC.)
Bnd of computations, total etudy area = 1054.90 (Ac.)
' The following figures may
be used for a unit hydrograph study of the same area.
' Area averaged pervious area fraction(Ap) = 0.840
Area averaged RI index number = 77.0
'
~
'
~
~
'
,
~
,
,
~
~
33
225
'
~
f
1
i
1
1
i
1
1
1
1
1
1
1
1
~
~
~ 3~
zs o
~ 25~
~ Rivereide County Rational Hydrology Program
CIVILCADD/CIVILDBSIGN Bngineeririg Software,(c) 1989 - 2001 Version 6.4
Rational Hydrology Study Date: 02/06/03 File:798SX.out
------------------------------------------------------------------------
~~ TR 29798 BXISTING CONDITION INCLUDING OFF-SZTE (NO DSTSNTION)
100 YSAR STORM
' JN 32006
------------------------------------------------------------------------
******+** HydrolOgy Study COntrol InfOrfnation **********
~ Bnglish (in-lb) Units used in input data file
, ------------------------------------------------------------------------
Lohr & Associates, inc., Temecula, CA - S/N 773
------------------------------------------------------------------------
~ Rational Method Hydrology Program based on
Rivereide County Flood Control & Water Conservation District
1978 hydrology manual
~ Stonn event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data .(Plate D-4.1)
~ For the [ Murrieta,Ttnc,Rnch CaNorco ] area used.
10 year storm 10 minute intensity = 2.360(In/Hr)
10 year etorm 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)
Stoxm event year = 300.0
~ Calculated rainfall intensity data:
1 hour inteneity = 1.300(in/Hr)
Slope of inteneity duration curve = 0.5500
~
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++t+++++++++++++++++
Process from Point/Station 100.000 to Point/Station 101.000
~ **** INITIAL AR$P, SVALUATION ****
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 stpercent>= 2.16
~ TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 16.255 min.
Rainfall intensity = 2.666(In/Hr) for a 100.0 year stoxm
~ UNDSVSLOPi3D (poor cover) subarea
Runoff Coefficient = 0.789
Decimal fraction aoil group A= 0.000
, Decimal fraction soil group B= 1.000
Decimal fraction soil group C= 0.000
Decimal fraction soil group D= 0.000 ~
RI index for soil(AMC 2) = 78.00 ~j~
Pervious area fraction = 1.000; Impervious fraction = 0.000
,
252
~ Initial aubarea runoff = 21.029(CFS)
~ Total initial etream 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 = 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 = 37.643fCFS)
~'
Natural valley channel type used
~ L.A. County flood control district forniula 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 xugged channels with
drope and waterfalls (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
UNDBVSLOPSD (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 stoxm
~ 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 CHANNBL TIMB + SUBARRA 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.)
Eetimated mean flow rate at midpoint of channel = 66.102(CFS)
Natural valley channel type used
~, L.A. County flood control district forn~ula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(English Unita)".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 elope = 0.0019
Travel time = 3.38 min. TC = 25.66 min. 3l~
~
~~
~
~ 253
~ Adding area flow to channel
UNDEVSIAPED (poor cover) subarea
Runoff Coefficient = 0.762
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
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 CHANNSL TIMB + SUHARBA FLOW ADDITION ****
~ Top of natural channel elevation = 1055.000(Ft.)
- 8nd 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(Bnglish Unita)".352)(slope"0.5)
Velocity using mean channel flow = 3.20(Ft/s)
~ Correction to map slope used on extremely xvgged channels mith
drops and waterfalls (Plate D-6.2)
Noxmal channel slope = 0.0047
~ Corrected/adjusted channel slope = 0.0047
Travel time = 3.75 min. TC = 29.42 min.
~ Adding area flow to channel
UNDBVSLOPBD (poor cover) aubarea
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 storni
~; Subarea runoff = 26.069(CFS) for 18.OOOtAC.)
Total runoff = 304.393(CFS) Total area = 62.800(AC.)
I ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Procesa from Point/Station 104.000 to Point/Station 105.000
***• NATURAL CHANNBL TIMB + SUHARBA FLOW ADDITION ****
~ Top of natural channel elevation = 1051.600(Ft.)
Snd of natural channel elevation = 1050.600(Ft.)
~ Length of natural channel = 400.000(Ft.)
Satimated mean flow rate at midpoint of channel = 121.348(CFS)
~ Natural valley channel type used 3~
~ Zy~
L.A. County flood control district fozmula for channel velocity:
~ Velocity(ft/e) _ (7 + 8(q(gngliah Unite)~.352)(slope"0.5)
Velocity using mean channel £low = 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
UNDSVSLOPED (poor cover) subarea
Runoff Coefficient = 0.747
Decimal fraction soil group A= 0.000
' Decimal fraction soil group H= 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 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 + SUBARSA FIAW ADDITION ****
Top of natural channel elevation = 1050.600(Ft.)
~ Snd 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 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 = 3.39(Ft/s)
Correction to map slope used on extremely rugged channels with
drops and waterfalla (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
UNDSVELOPSD (poor cover) subarea .
Runoff Coefficient = 0.758
~; Decimal fraction soil group A= 0.000
Decimal fraction soil group 8= 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 rursoff = 28.261(CFS) for 21.400(Ac.)
Total runoff = 160.608(CFS) Total area = 104.600(AC.)
~ 30
25G
~ Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
' Pervious area fraction = 1.000; Impesvious fraction = 0.000
Rainfall intensity = 1.668(In/Hr) for a 100.0 year storm
Subarea runoff = 15.328(CFS) for 12.000(Ac.)
~ Total runoff = 1642.988(CFS) Total area = 1066.900(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~ Proceas from Point/Station 108.000 to Point/Station 108.000
**** CONFLUENCB OF MINOR STR8AM5 ****
~ Along Main Stream number: 1 in noxmal etream number 2
Stream flow area = 1066.900(AC.)
- Runoff from thie etream = 1642.888(CFS)
t Time of concentration = 38.13 min.
Rainfall intensity = 1.668(In/Hr)
- Summary of stream data:
, Stream Flow rate TC Rainfall Intenaity
No. (CFS) (min) (In/Hr)
, 1 160.608 35.27 1.741
2 1642.888 38.13 1.668
' Largeat stream flow has longer time of concentration
Qp = 1642.888 + sum of
Qb Ia/ib
160.608 * 0.958 = 153.873
Qp = 1796.760
~~ Total of 2 streams to confluence:
Flow rates before confluence point:
~ 160.608 1642.888
Area of streame before confluence:
104.600 1066.900
~ Results of confluence:
Total flow rate = 1796.760(CFS)
Time of concentration = 38.125 min.
~ Sffective stream area after confluence = 1171.500(Ac.)
~ ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**+'* IMPROVSD CHANNSL 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(CFS)
~ Manning's 'N' = 0.015 _
' Maximum depth of channel 8.000(Ft.)
Flow(q) thru subarea = 1810.564(CFS)
~ Depth of flow = 5.957(Ft.), Average velocity = 17.968(Ft/s)
Channel flow top width = 28.829(Ft.)
Flow Velocity = 17.97(Ft/s)
Travel time = 2.18 min. ?v-~
~
zs7
~ Time of concentration = 40.31 min.
~ Sub-Channel No. 1 Critical depth = 7.625(Ft.)
~ ~ ~ Critical flow top width = 35.500(Ft.)
~ ~ ~ Critical flow velocity= 11.726(Ft/s)
az. ~ ~ ~ Critical flow area = 154.406(Sq.Ft)
~ Adding area flow to channel
~ UNDgVSLOPSD (poor cover) subarea
Runoff Coefficient = 0.762
Decimal fraction soil group A= 0.000
~ Decimal fraction soil group B= 0.500
Decimal fraction soil group C= 0.500
Decimal fraction soil group D= 0.000
RI index for soil(AMC 2) = 82.00
~ Pervious area fraction = 1.000; Impervious fraction = 0.000
Rainfall intenaity = 1.618fIn/Hr) for a 100.0 year storm
Subarea runoff = 22.196(CFS) for 18.000(Ac.)
d Total runoff = 1818.957(CFS) Total area = 1189.500(Ac.)
+++++++++++++++++++++++++++++++++++++++++++++++++++++++++~++++++++++++
Process from Point/Station 109.000 to Point/Station 109.000
~ +*** CONFLUSNCB OF MAIN STRBAMS ***t
~ The following data inside Main Stream is listed:
in Main Stream number: 1
Stream flow area = 1189.500(Ac.)
Runoff from this atream = 1818.957(CFS)
M Time of concentration = 40.31 min.
Rainfall intensity = 1.618(In/Hr)
Program is now starting with Main Stream No. 2
~~ ++++++++++++++++++++~+++++++++++++++++++++++++++++++++++++++++++++++++
~ Proceas from Point/Station 110.000 to Point/Station 111.000
•t** INITIAL AREA SVALUATION ****
Initial area flow distance = 1000.000(Ft.)
Top (of initial area) elevation = 1058.000(Ft.)
~- Bottom (of initial area) elevation = 1045.ooo(Ft.)
Difference in elevation = 13.000(Ft.)
Slope = 0.01300 s(percent)= 1.30
~, TC = k(0.530)*[(length"3)/(elevation change)]"0.2
Initial area time of concentration = 20.021 min.
Rainfall intensity =. 2.377(In/Hr) for a 100.0 year etozm
~, UNDSVSIAPBD (poor cover) subarea
Rurtoff 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 etream area = 6.700(AC.)
~ Pervious area fraction = 1.000
~-V~
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
~
~
~, 25$
Process from Point/Station 111.000 to Point/Station 112.000
+*** NAT[JRAL CHANNBL TIMS + SUBAR$A 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.)
$stimated mean flow rate at midpoint of channel = 19.909(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 uaing mean channel flow = 2.73(Ft/s)
Correction to map slope used on extremely rugged channels with
drope and waterfalls (Plate D-6.2)
' Normal channel slope = 0.0083
Corrected/adjusted channel slope = 0.0083
Travel time = 5.86 min. TC = 25.88 min.
'
i
~
'
,
~
'
~
'
~
~
P,dding area flow to channel
UNDSVEIAPSD (poor cover) subarea
Runoff Coefficient = 0.788
Decimal fraction eoil group A= 0.000
Decimal fraction soil group H= 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 inter~sity = 2.065(In/Hr) for a 300.0 year stoxm
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 CHANNSL TIMB + SUBARBA 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.)
Setimated mean flow rate at midpoint of channel = 27.783(CFS)
Natural valley channel type used
L.A. County flood control district forniula for channel velocity:
Velocity(ft/s) _ (7 + 8(q(Bnglish Unita)".352)(slope"0.5)
Velocity using mean channel flow = 2.63(Ft/s)
Correction to map alope 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 flow to channel
UNDBVSLOPBD (poor cover) subarea
Runoff Coefficient = 0.781
Decimal fraction soil group A= 0.000
Decimal fraction soil group B= 0.500
4\
,,
~ Z~ 5
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
, Procesa from Point/Station 121.000 to Point/Station 122.000
***• NATURAL CHANNBL TIMB + 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.)
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 + e(q(Bnglieh Units)".352)(slope"0.5)
Velocity using mean channel flow = 3.95(Ft/s)
Correction to map slope used on extremely rugged channels with
~ drope and materfalls (Plate D-6.2)
Normal channel elope = 0.0088
Corrected/adjusted channel slope = 0.0088
~ Travel time = 4.81 min. TC = 25.48 min.
~ Adding area flow to channel
UNDSVSLOPED (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 inteneity = 2.082(In/Ar) 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.)
M +++++++++++++++++~++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 122.000 to Point/Station 122.000
***• CONFLUENCS OF MINOR STR$AMS **+*
~ Along Main Stream number: 2 in nozmal stream number 2
Stream flow area = 42.200(AC.)
Runoff fram this stream = 77.947(CFS)
~ Time of concentration = 25.48 min.
Rainfall intensity = 2.082(In/Hr)
Summary of stream data:
~ Stream Flom rate TC Rainfall Intenaity
No. (CFS) (min) (In/Hr)
~ 1 119.236 34.39 1.766
2 77.947 25.48 2.082
Largeat etream flow has longer time of concentration
M, Qp = 119.236 + eum of
Qb ia/Ib
~ 77.947 * 0.848 = 66.102
Qp = 185.338
Total of 2 streams to confluence: ~?~
~ Flow rates before confluence point:
i ~
I~
2GC
119.236 77.947
~ Area of atreams before confluence:
73.200 42.200
Reaulte of confluence:
~ Total flow rate = 185.338(CFS)
Time of concentration = 34.390 min.
Sffective etream area after confluence = 115.400(AC.)
r ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Proceas from Point/Station 122.000 to Point/Station 122.000
II ~ ***~ CONFLUBNCS OF MAIN STREAMS ****
The following data inside Main Stream is listed:
!,I ~ In Main Stream number: 2
Stream flow area = 115.400(AC.)
Runoff from this stream = 185.338(CFS)
Time of concentration a 34.39 min.
'I ~ Rainfall intensity = 1.766(In/Hr)
Summary of atream data:
I~ Stream Flow rate TC Rainfall Inteneity
No. (CFS) (min) (In/Hr)
~ 1 1818.957 40.31 1.618
2 185.338 34.39 1.766
Largest stream flow has longer time of concentration
~ Qp = 1818.957 + sum of
Qb ia/Ib
185.338 * 0.916 = 169.846
~ Qp = 1988.802
Total of 2 main streams to confluence:
Flow rates before confluence point:
~ 1818.957 185.338
~ Area of atreame before confluence:
1189.500 115.400
~ Results of confluence:
Total flow rate = 1988.802(CFS)
M Time of concentration = 40.305 min. _
8ffective etream area after confiuence 1304.900(AC.)
~~