HomeMy WebLinkAboutHydrology Sep.18, 2000
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INCLUDED WITHIN ARE HYDROLOGY AND
HYDRAULIC CALCULATIONS USED IN THE
DESIGN OF STORM DRAIN FOR
PARCEL MAP 28627
(FRONT STREET)
IN THE CITY OF TEMECULA
SEPTEMBER 18, 2000
/
PREPARED BY
.!!
a.::,
Lohr + Associates Inc
Land Planning 43513 Ridge Park Drive
Civil Engineering Temecula, CA 92590
Surveying Ph. 909 676-6726 Fax 909 699-0896
ATTENTION: HERMAN HOVAGIMYAN
TELEPHONE: (909) 676-6726
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ffl1. ~(}C, 17 JOB. NO. 7c,oo:3
(F1?()N76iJeeeT) BY 1kR.fr111-N
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SHT. I OF _
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HYDROLOGIC SOILS GROUP MAP
FOR
TEMECULA ~
LEGEND
SOLS GROUP BOUNDARY
A SOILS GROUP DESIGNATION
RCFCaWCD
HYDROLOGY JVJANUAL
~-~
o FEET WOO
PIIITI': 1;-160
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Te' LIMITATIONS'
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40- Singl. Famlly-1/4 Acre Lot
20- Sin;l. Family -I Acr. Lot 35
6 10 - Slngl. Family- 2 1/2 Acre Lot
10.0 40
EXAMPLE:.:..
5 ( I) L' 550', H. 5.0', K. Sln;le FcImlly (5-7 DUlAC)
Devllopment, TC'12.6 min.
4 (2) L'5!50', H.!5.0', K.Comm.rclal
Development, TC'9.7 mln.
SAN BERNARDINO COUNTY
HYDROLOGY MANUAL
TIME OF CONCENTRATION
NOMOGRAPH ?
FOR INITIAL SUBAREA
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I LOHR + ASSOCIATES INC Job No.
1503 South Coast Drive By
Suite 203 Date
I Costa Mesa California 92626 Sht. 8 of
[714] 754-5714
Land Planning
I Civil I Engineering
Surveying
I WIO 111 or:
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Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989 - 1998 Version 5.1
Rational Hydrology Study Date: 09/14/00 File:P28627.out
-----------------------------------------------------------------------
PM 28627 HYDROLOGY ANALYSIS
10 YEAR STORM
IN 26003
-----------------------------------------------------------------------
*********
Hydrology Study Control Information **********
English (in-lb) Units used in input data file
-----------------------------------------------------------------------
Lohr + Associates, Inc., Temecula, California - SIN 773
-----------------------------------------------------------------------
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
Storm event (year) =
10,00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,TmC,Rnch CaNorco ] area used.
10 year storm 10 minute intensity = 2.360 (In/Hr)
10 year storm 60 minute intensity = 0.880{In/Hr)
100 year storm 10 minute intensity = 3.480{In/Hr)
100 year storm 60 minute intensity = 1.300 (In/Hr)
Storm event year = 10.0
Calculated rainfall intensity data:
1 hour intensity = 0.880 (In/Hr)
Slope of intensity duration curve = 0.5500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100.000 to Point/Station 102.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 570.000{Ft.)
Top (of initial area) elevation = 1002.200{Ft.)
Bottom (of initial area) elevation = 994.400{Ft.)
Difference in elevation = 7.800{Ft.)
Slope = 0.01368 s{percent) = 1.37
TC = k{0.300) * [{length^3)1 {elevation change)]^0.2
Initial area time of concentration = 8.958 min.
Rainfall intensity = 2,505{In/Hr) for a 10.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.873
Decimal fraction soil group A = 0.000
Decimal fraction soil 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
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Initial subarea runoff =
Total initial stream area =
Pervious area fraction = 0.100
2.S66(CFS)
1.310(Ac.l
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 1.310(Ac.)
Runoff from this stream = 2.S66(CFS)
Time of concentration = S,96 min.
Rainfall intensity = 2.505 (In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** INITIAL AREA EVALUATION ****
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Initial area flow distance = 520.000(Ft.)
Top (of initial area) elevation = 9S.600(Ft.)
Bottom (of initial area) elevation = 94.400(Ft.)
Difference in elevation = 4.200(Ft.)
Slope = O.OOSOS s(percent) = O.Sl
TC = k(0.300)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.596 min.
Rainfall intensity = 2.412 (In/Hr) for a 10,0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.S73
Decimal fraction soil group A = 0.000 A-2
Decimal fraction soil 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
Initial subarea runoff = 4.041(CFS)
Total initial stream area = 1.920(Ac.)
Pervious area fraction = 0.100
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
.
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Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1.920(Ac.)
Runoff from this stream = 4.041(CFS)
Time of concentration = 9.60 min.
Rainfall intensity = 2.412 (In/Hr)
Summary of stream data:
Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
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1
2
Largest
Qp =
2.S66 S.96
4.041 9.60
stream flow has longer time of
4.041 + sum of
2.505
2.412
concentration
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Qp =
Qb
2.866 *
6.801
Ia/Ib
0.963 =
2.760
Total of 2 streams to confluence:
Flow rates before confluence point:
2.866 4,041
Area of streams before confluence:
1.310 1.920
Results of confluence:
Total flow rate =
Time of concentration
Effective stream area
6.801(CFS)
= 9.596 min.
after confluence =
3.230 (Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 200.000 to Point/Station 202,000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 750.000(Ft.)
Top (of initial area) elevation = 1001.300(Ft.)
Bottom (of initial area) elevation = 994.100(Ft.)
Difference in elevation = 7.200(Ft.)
Slope = 0.00960 s(percent)= 0.96
TC = k(O,300)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.732 min.
Rainfall intensity = 2.268 (In/Hr) for a 10.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.872
Decimal fraction soil group A = 0.000 B-1
Decimal fraction soil group B = 1.000
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.000
RI index for soil(AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900
Initial subarea runoff = 5.929(CFS)
Total initial stream area = 3.000(Ac.)
Pervious area fraction = 0.100
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 202.000 to Point/Station 202.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 3.000(Ac.)
Runoff from this stream = 5.929(CFS)
Time of concentration = 10.73 min.
Rainfall intensity = 2.268(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 201.000 to Point/Station 202.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 710.000(Ft,)
Top (of initial area) elevation = 98.600(Ft.)
Bottom (of initial area) elevation = 93.900(Ft.)
Difference in elevation = 4.700(Ft.)
Slope = 0.00662 s(percent) = 0.66
\:?
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TC = k(0.300)*[(lengthA3)/(elevation change)] AO.2
Initial area time of concentration = 11.310 min.
Rainfall intensity = 2.203 (In/Hr) for a 10.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.871
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 1.000 (3, 2
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
Initial subarea runoff = 3.205(CFS}
Total initial stream area = 1.670(Ac.}
Pervious area fraction = 0.100
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from point/Station 202.000 to Point/Station 202.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1.670(Ac.}
Runoff from this stream = 3.205(CFS)
Time of concentration = 11.31 min.
Rainfall intensity = 2.203 (In/Hr)
Summary of stream data:
Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
1 5.929 10.73
2 3.205 11.31
Largest stream flow has longer
Qp = 5.929 + sum of
Qa Tb/Ta
3.205 * 0.949 =
Qp = 8,970
2.268
2.203
or shorter time of concentration
3.041
Total of 2 streams to confluence:
Flow rates before confluence point:
5.929 3.205
Area of streams before confluence:
3.000 1.670
Results of confluence:
Total flow rate = 8.970(CFS}
Time of concentration = 10.732 min.
Effective stream area after confluence =
End of computations, total study area =
The following figures may
be used for a unit hydrograph study of the
4.670 (Ac . )
7.90 (Ac.)
same area.
Area averaged pervious area fraction (Apl =
Area averaged RI index number = 56.0
0.100
\~
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Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989 - 1998 Version 5.1
Rational Hydrology Study Date: 09/14/00 File:P28627.out
PM 28627 HYDROLOGY ANALYSIS
100 YEAR STORM
IN 26003
*********
Hydrology Study Control Information **********
English (in-lb) Units used in input data file
Lohr + Associates, Inc., Temecula, California - SIN 773
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
Storm event (year) = 100.00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,TmC,Rnch CaNorco ] area used.
10 year storm 10 minute intensity = 2.360(In/Hr)
10 year storm 60 minute intensity = 0.880(In/Hr)
100 year storm 10 minute intensity = 3.480(In/Hr)
100 year 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 102.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 570.000(Ft.)
Top (of initial area) elevation = 1002.200(Ft.)
Bottom (of initial area) elevation = 994.400(Ft.)
Difference in elevation = 7.800(Ft.)
Slope = 0.01368 s (percent) = 1.37
TC = k(0.300)*[(lengthA3)/(elevation change)] AO.2
Initial area time of concentration = 8.958 min.
Rainfall intensity = 3.700(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.880 A-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
RI index for soil{AMC 2) = 56.00
Pervious area fraction = 0.100; Impervious fraction = 0.900 \~
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Initial subarea runoff =
Total initial stream area =
Pervious area fraction = 0.100
4.266(CFS)
1.310 (Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 1.310(Ac.)
Runoff from this stream = 4.266(CFS)
Time of concentration = 8.96 min.
Rainfall intensity = 3,700(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** INITIAL AREA EVALUATION ****
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Initial area flow distance = 520.000(Ft.)
Top (of initial area) elevation = 98.600(Ft.)
Bottom (of initial area) elevation = 94.400(Ft.)
Difference in elevation = 4.200(Ft.)
Slope = 0.00808 s (percent) = 0.81
TC = k(0.300)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 9.596 min.
Rainfall intensity = 3.563 (In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.880
Decimal fraction soil group A = 0.000 fI- '2.
Decimal fraction soil 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
Initial subarea runoff = 6.017(CFS)
Total initial stream area = 1.920(Ac.)
Pervious area fraction = 0.100
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
I
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1.920(Ac.)
Runoff from this stream = 6.0l7(CFS)
Time of concentration = 9.60 min.
Rainfall intensity = 3.563 (In/Hr)
Summary of stream data:
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Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
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1
2
Largest
Qp =
4.266 8.96
6.017 9.60
stream flow has longer time of
6.017 + sum of
3,700
3,563
concentration
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Qp=
Qb
4.266 ..
10.124
Ia/Ib
0.963 =
4.108
Total of 2 streams to confluence:
Flow rates before confluence point:
4.266 6.017
Area of streams before confluence:
1.310 1.920
Results of confluence:
Total flow rate = 10.124(CFS)
Time of concentration = 9.596 min.
Effective stream area after confluence =
3.230(AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 200.000 to Point/Station 202.000
........ INITIAL AREA EVALUATION ........
Initial area flow distance = 750.000{Ft.)
Top (of initial area) elevation = 1001.300(Ft.)
Bottom (of initial area) elevation = 994.100(Ft.)
Difference in elevation = 7.200(Ft.)
Slope = 0.00960 s (percent) = 0.96
TC = k(0.300)"[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.732 min,
Rainfall intensity = 3.350(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.879
Decimal fraction soil group A = 0.000
Decimal fraction soil 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
Initial subarea runoff = 8.830(CFS)
Total initial stream area = 3.000(Ac.)
Pervious area fraction = 0.100
~-\
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 202.000 to Point/Station 202,000
........ CONFLUENCE OF MINOR STREAMS ........
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 3.000(Ac.)
Runoff from this stream = 8.830(CFS)
Time of concentration = 10.73 min.
Rainfall intensity = 3.350(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 201.000 to Point/Station 202.000
........ INITIAL AREA EVALUATION ........
Initial area flow distance = 710.000(Ft.)
Top (of initial area) elevation = 98.600(Ft.)
Bottom (of initial area) elevation = 93.900{Ft.)
Difference in elevation = 4.700(Ft.)
Slope = 0.00662 s (percent) = 0.66
V6
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TC = k(0.300)*[(lengthA3)/(elevation change)] AO.2
Initial area time of concentration = 11.310 min.
Rainfall intensity = 3.255(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
Initial subarea runoff = 4.773(CFS)
Total initial stream area = 1.670(Ac.)
Pervious area fraction = 0.100
B-2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 202.000 to Point/Station 202.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1.670(Ac.)
Runoff from this stream = 4.773(CFSl
Time of concentration = 11.31 min.
Rainfall intensity = 3.255(In/Hr)
Summary of stream data:
Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
1
2
Largest
Qp=
8.830 10.73
4.773 11.31
stream flow has longer or
8.830 + sum of
Qa Tb/Ta
4.773 * 0.949 =
13.359
3.350
3.255
shorter time
of concentration
4,529
Qp =
Total of 2 streams to confluence:
Flow rates before confluence point:
8.830 4.773
Area of streams before confluence:
3.000 1.670
Results of confluence:
Total flow rate = 13.359(CFSl
Time of concentration = 10.732 min.
Effective stream area after confluence =
End of computations, total study area =
The following figures may
be used for a unit hydrograph study of the
4.670 (Ac.)
7.90 (Ac.)
same area.
Area averaged pervious area fraction(Ap) =
Area averaged RI index number = 56.0
0.100
\'\
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1'1
Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1989 - 1998 Version 5.1
Rational Hydrology Study Date: 04/05/01 File:P627CB.out
PM 28627 CATCH BASIN HYDROLOGY ANALYSIS
100 YEAR STORM
IN 26003
*********
Hydrology Study Control Information **********
English (in-lb) Units used in input data file
Lohr + Associates, Inc., Temecula, California - SIN 773
Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
Storm event (year) = 100,00 Antecedent Moisture Condition = 2
Standard intensity-duration curves data (Plate D-4.1)
For the [ Murrieta,Tmc,Rnch CaNorco ] area used.
10 year storm 10 minute intensity = 2,360(In/Hr)
10 year storm 60 minute intensity = O,880(In/Hr)
100 year storm 10 minute intensity = 3.480(In/Hr)
100 year storm 60 minute intensity = l,300(In/Hr)
Storm event year = 100.0
Calculated rainfall intensity data:
1 hour intensity = l,300(In/Hr)
Slope of intensity duration curve = 0,5500
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 100,000 to point/Station 101.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 930.000(Ft.)
Top (of initial area) elevation = 1014.000(Ft.)
Bottom (of initial area) elevation = 995.300(Ft.)
Difference in elevation = 18.700(Ft.)
Slope = 0.02011 s(percent) = 2.01
TC = k(O,390)*[(lengthA3)/(elevation change)] AO.2
Initial area time of concentration = 13.116 min.
Rainfall intensity = 3.000(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1/4 Acre Lot)
Runoff Coefficient = 0.784
Decimal fraction soil group A = 0.000 C 8 ,I
Decimal fraction soil 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 ~
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Initial subarea runoff =
Total initial stream area =
Pervious area fraction = 0.500
6.864(CFS)
2.920 (AC.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 101.000 to Point/Station 102.000
**** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION ****
TOp of street segment elevation = 995.300(Ft.)
End of street segment elevation = 994.000(Ft.)
Length of street segment = 255.000(Ft.)
Height of curb above gutter flowline = 6.0{In.)
Width of half street (curb to crown) = 39.000(Ft.)
Distance from crown to crossfall grade break = 37.000(Ft.)
Slope from gutter to grade break (v/hz) = 0.080
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 5,OOO(Ft.l
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft.)
Gutter hike from flowline = 1.920(In.)
Manning's N in gutter = 0,0150
Manning's N from gutter to grade break = 0.0150
Manning's N from grade break to crown = 0.0150
Estimated mean flow rate at midpoint of street = 7.840(CFS)
Depth of flow = 0.484(Ft.), Average velocity = 2.285(Ft/s)
Streetflow hydraulics at midpoint of street travel:
Halfstreet flow width = 18.197 (Ft. ) C 13 - 2
Flow velocity = 2.28(Ft/s)
Travel time = 1.86 min. TC = 14.98 min.
Adding area flow to street
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
Rainfall intensity = 2.789(In/Hr) for a 100,0 year storm
Subarea runoff = 2.027(CFS) for 0.830(Ac.)
Total runoff = 8.891(CFS) Total area = 3.750(Ac.)
Street flow at end of street = 8.891(CFS)
Half street flow at end of street = 8.891(CFS)
Depth of .flow = 0,503 (Ft.), Average velocity = 2.348 (Ft/s)
Warning: depth of flow exceeds top of curb
Distance that curb overflow reaches into property = O,15(Ft.)
Flow width (from curb towards crown)= 19.150(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 1
Stream flow area = 3,750(Ac.)
Runoff from this stream = 8.891(CFS)
Time of concentration = 14.98 min.
2.\
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Rainfall intensity = 2.789(In/Hr)
Program is now starting with Main Stream No. 2
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 103.000 to Point/Station 106.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 570.000(Ft,)
Top (of initial area) elevation = 1002.200(Ft.)
Bottom (of initial area) elevation = 994.400(Ft.)
Difference in elevation = 7.800(Ft.)
Slope = 0.01368 s(percent) = 1.37
TC = k(0.300)*[(length~3)/(elevation change)]~0.2
Initial area time of concentration = 8.958 min.
Rainfall intensity = 3.700(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.880 CB- 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) = 56.00
Pervious area fraction = 0,100; Impervious fraction = 0.900
Initial subarea runoff = 4.266(CFS)
Total initial stream area = 1.310(Ac,)
Pervious area fraction = 0,100
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 106.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 1
Stream flow area = 1.310(AC.)
Runoff from this stream = 4.266(CFS)
Time of concentration = 8.96 min.
Rainfall intensity = 3.700(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 104.000 to Point/Station 105.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 260.000(Ft.)
Top (of initial area) elevation = 998.600(Ft.)
Bottom (of initial area) elevation = 996.800(Ft.)
Difference in elevation = 1.800(Ft.)
Slope = 0.00692 s(percent) = 0.69
TC = k(O,300)*[(length~3)/(elevation change)]~0.2
Initial area time of concentration = 7.500 min.
Rainfall intensity = 4.080(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.882
Decimal fraction soil group A = 0.000 (! B - 4
Decimal fraction soil 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 ~
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Initial subarea runoff =
Total initial stream area =
Pervious area fraction = 0.100
2,302(CFS)
o . 640 (Ac. )
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 105.000 to Point/Station 106.000
**** STREET FLOW TRAVEL TIME + SUBAREA FLOW ADDITION ****
Top of street segment elevation = 995.400(Ft.)
End of street segment elevation = 994.400(Ft.)
Length of street segment = 190,OOO(Ft,)
Height of curb above gutter flowline = 6.0(In.)
Width of half street (curb to crown) = 28.000(Ft.)
Distance from crown to crossfall grade break = 26.000(Ft.)
Slope from gutter to grade break (v/hz) = 0.080
Slope from grade break to crown (v/hz) = 0.020
Street flow is on [1] side(s) of the street
Distance from curb to property line = 11.000(Ft.)
Slope from curb to property line (v/hz) = 0.020
Gutter width = 2.000(Ft,)
Gutter hike from flowline = 1.920(In.)
Manning's N in gutter = 0.0150
Manning's N from gutter to grade break = 0.0150
Manning's N from grade break to crown = 0.0150
Estimated mean flow rate at midpoint of street = 2.662(CFS)
Depth of flow = 0.354(Ft.), Average velocity = 1.783(Ft/s)
Streetflow hydraulics at midpoint of street travel:
Halfstreet flow width = 1l.716(Ft.) C'13-5
Flow velocity = 1.78(Ft/s)
Travel time = 1,78 min. TC = 9,28 min.
Adding area flow to street
COMMERCIAL subarea type
Runoff Coefficient = 0,880
Decimal fraction soil group A = 0.000
Decimal fraction soil 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
Rainfall intensity = 3.630(In/Hr) for a 100.0 year storm
Subarea runoff O,639(CFS) for O,200(Ac.)
Total runoff = 2.94l(CFS) Total area = 0.840(Ac.)
Street flow at end of street = 2.941(CFS)
Half street flow at end of street = 2.94l(CFS)
Depth of flow = 0.364(Ft.), Average velocity = 1.826(Ft/s)
Flow width (from curb towards crown)= 12.210(Ft.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 106.000 to Point/Station 106.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 2 in normal stream number 2
Stream flow area = 0.840(Ac.)
Runoff from this stream = 2.941(CFS)
Time of concentration = 9,28 min.
Rainfall intensity = 3.630(In/Hr)
Summary of stream data:
t:b
Total of 2 streams to confluence:
Flow rates before confluence point:
4.266 2.941
Area of streams before confluence:
1.310 0.840
Results of confluence:
Total flow rate =
Time of concentration
Effective stream area
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Stream
No.
1
2
Largest
Qp =
Qp =
23
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
4.266 8,96
2.941 9.28
stream flow has longer or
4.266 + sum of
Qa Tb/Ta
2.941 * 0.966 =
7.106
3.700
3,630
shorter time
of concentration
2.840
7.106(CFS)
= 8.958 min.
after confluence =
2.150 (Ac,)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from point/Station 106.000 to Point/Station 106.000
**** CONFLUENCE OF MAIN STREAMS ****
The following data inside Main Stream is listed:
In Main Stream number: 2
Stream flow area = 2.150(Ac.)
Runoff from this stream = 7.106(CFSl
Time of concentration = 8,96 min.
Rainfall intensity = 3.700(In/Hr)
Summary of stream data:
Stream
No.
1
2
Largest
Qp =
Qp =
Flow rate
(CFS)
Rainfall Intensity
(In/Hr)
TC
(min)
8.891 14.98
7.106 8.96
stream flow has longer
8.891 + sum of
Qb Ia/Ib
7.106 * 0.754 =
14.247
2,789
3.700
time of concentration
5.357
Total of 2 main streams to confluence:
Flow rates before confluence point:
8.891 7.106
Area of streams before confluence:
3,750 2.150
Results of confluence:
Total flow rate = 14.247(CFS)
Time of concentration = 14.976 min.
Effective stream area after confluence
=
5.900 (Ac.)
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++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from point/Station 102.000 to point/Station 102,000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 5.900(AC.}
Runoff from this stream = 14.247(CFS)
Time of concentration = 14.98 min.
Rainfall intensity = 2.789(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from point/Station 107.000 to point/Station 102.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 220,OOO(Ft.)
Top (of initial area) elevation = 999.000(Ft.}
Bottom (of initial area) elevation = 994.000(Ft.)
Difference in elevation = 5.000(Ft.)
Slope = 0.02273 s(percent) = 2.27
TC = k(O.300)*[(length~3)/(elevation change)]~0.2
Initial area time of concentration = 5.531 min.
Rainfall intensity = 4,824(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.884 C5-<:'
Decimal fraction soil group A = 0.000
Decimal fraction soil 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
Initial subarea runoff = l.876(CFS)
Total initial stream area = 0.440(Ac.)
Pervious area fraction = 0.100
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 0.440(Ac.)
Runoff from this stream = 1.876(CFS)
Time of concentration = 5.53 min.
Rainfall intensity = 4.824 (In/Hr)
Summary of stream data:
Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
(In/Hr)
1
2
Largest
Qp =
14.247 14.98
1.876 5.53
stream flow has longer
14.247 + sum of
Qb Ia/Ib
1.876 * 0.578 =
15.332
2.789
4.824
time of concentration
1. 085
Qp=
Total of 2 streams to confluence:
w
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25
Flow rates before confluence point:
14.247 1.876
Area of streams before confluence:
5.900 0.440
Results of confluence:
Total flow rate = 15.332(CFS)
Time of concentration = 14.976 min,
Effective stream area after confluence =
6.340 (Ac.)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 102.000 to Point/Station 102.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 1
Stream flow area = 6.340(Ac.)
Runoff from this stream = 15.332 (CFS)
Time of concentration = 14.98 min.
Rainfall intensity = 2.789(In/Hr)
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 108.000 to Point/Station 109.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 400.000(Ft.)
Top (of initial area) elevation = 998.500(Ft.)
Bottom (of initial area) elevation = 995.300(Ft.l
Difference in elevation = 3.200(Ft.)
Slope = 0.00800 s (percent) = 0.80
TC = k(0.300)*[(length~3)/(elevation change)]~0.2
Initial area time of concentration = 8.656 min.
Rainfall intensity = 3.770(In/Hr) for a 100.0 year storm
COMMERCIAL subarea type
Runoff Coefficient = 0.880 <:::6-7
Decimal fraction soil group A = 0.000
Decimal fraction soil 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
Initial subarea runoff = 3.585(CFS)
Total initial stream area = 1.080(Ac.)
Pervious area fraction = 0.100
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 109.000 to Point/Station 109.000
**** CONFLUENCE OF MINOR STREAMS ****
Along Main Stream number: 1 in normal stream number 2
Stream flow area = 1.080(Ac.)
Runoff from this stream = 3.585(CFS)
Time of concentration = 8.66 min.
Rainfall intensity = 3.770(In/Hr)
Summary of stream data:
Stream
No.
Flow rate
(CFS)
TC
(min)
Rainfall Intensity
( In/Hrl
')/I?
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Qp =
15.332 14.98
3.585 8.66
stream flow has longer
15.332 + sum of
Qb Ia/lb
3.585 * 0,740 =
17.984
2.789
3.770
time of concentration
1
2
Largest
Qp =
2.652
Total of 2 streams to confluence:
Flow rates before confluence point:
15.332 3.585
Area of streams before confluence:
6.340 1.080
Results of confluence:
Total flow rate = 17.984(CFS)
Time of concentration = 14.976 min.
Effective stream area after confluence =
End of computations, total study area =
The following figures may
be used for a unit hydrograph study of the
7.420 (Ac,)
7.42 (Ac.)
same area.
Area averaged pervious area fraction (Ap) =
Area averaged RI index number = 56.0
0.257
2,.1
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LOHR + ASSOCIATES INC. fM '28' '27
43513 RIDGE PARK DRIVE
TEMECULA, CA 92590
PH. 9lJ9..67~
FAX 9lJ9..699.0896
. LAND PlANNING. CIVIL ENGINEERING. SURVEYING
JOB No,
BY
DATE
SHT.
OF
2' <><> ~
I1't;:~MIfN
+/$101
'2.7
€k./~T. c.8. @ ~/II, q~..,.c '.'3 ftJ tJ)lH7I!NtI,/ <6y/"!I'S-:> '
!Q,o,,= /'7.3?J CF~
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& .. 8.0 )( o. (,7 ftJl.13. OO.Go
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T1 PM 28627 EXIST. LINE "H-l"
0
T2 100 YEAR STORM
T3 IN 26003
SO 1008,690 983.920 1 988.550
R 1076.250 987.410 1 .013 .000
.000 0
TS 1079.420 987,910 2 .014 .000
R 1158.430 988.700 2 .013 .000
WE 1158.430 988.700 3 .200
SH 1158.430 988,700 3 988.700
CD 1 4 1 .000 2.000 .000 .000 .000 .00
CD 2 4 1 .000 1.500 .000 .000 .000 .00
CD 3 2 0 .000 4.800 3.000 .000 .000 .00
Q 17.980 .0
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