HomeMy WebLinkAboutTract Map 9833 Lot 8 Hydrology & Hydraulics (Aug.2,1996)
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Riverside County Rational Hydrology Program
CIVILCADD/CIVILDESIGN Engineering Software, (c) 1992
Rational Hydrology Study Date: 8/ 2/96
Version 3.2
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Tract 9833, Por. Lot 20 & 21, Darrell D. Clendenen
Proposed Residential Grading Plan, City of Temecula, CA
100 yr Design Analysis
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Hydrology Study Control Information **********
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Rational Method Hydrology Program based on
Riverside County Flood Control & Water Conservation District
1978 hydrology manual
Storm event (year) = 100.00 Antecedent Moisture Condition = 3
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 10.000 to Point/Station 20.000
**** INITIAL AREA EVALUATION ****
Initial area flow distance = 800.000(Ft.)
Top (of initial area) elevation = 1272.000(Ft.)
Bottom (of initial area) elevation = l184.000(Ft.)
Difference in elevation = 88.000(Ft:)
Slope = 0.11000 s(percent)= 11.00
TC = k(0.480)*[(length^3)/(elevation change)]^0.2
Initial area time of concentration = 10.819 min.
Rainfall intensity = 3.335(In/Hr) for a 100.0 year storm
SINGLE FAMILY (1 Acre Lot)
Runoff Coefficient = 0.843
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.800; Impervious fraction = 0.200
Initial subarea runoff = l8.865(CFS)
Total initial stream area = 6.710(Ac.)
Pervious area fraction = 0.800 ~
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!Process from Point/Station 30.000 to Point/Station 20.000
**** SUBAREA FLOW ADDITION ****
;SINGLE FAMILY (1 Acre Lot)
:Runoff Coefficient = 0.843
,Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Qecimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.800; Impervious fraction = 0.200
:Time of concentration = 10.82 min.
Rainfall intensity = 3.335(In/Hr) for a 100.0 year storm
Subarea runoff = 18.950(CFS) for 6.740(Ac.)
:Total runoff = 37.815(CFS) Total area = 13.450(Ac.)
,++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Process from Point/Station 20.000 to Point/Station 40.000
,**** NATURAL CHANNEL TIME + SUBAREA FLOW ADDITION ****
:Top of natural channel elevation = 1184.000(Ft.)
End of natural channel elevation = 1129.000(Ft.)
.Length of natural channel = 1000.000(Ft.)
Estimated mean flow rate at midpoint of channel = 47.768(CFS)
Natural valley channel type used
.L.A. County flood control district formula for channel velocity:
Velocity = (7 + 8(q^.352) (slope^0.5)
Velocity using mean channel flow = S.96(Ft/s)
Correction to map slope used on extremely rugged channels with
.drops and waterfalls (Plate D-6.2)
Normal channel slope = 0.0550
Corrected/adjusted channel slope = 0.0550
Travel time = 1.86 min. TC = 12.68 min.
Adding area flow to channel
SINGLE FAMILY (I Acre Lot)
Runoff Coefficient = 0.838
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.800; Impervious fraction = 0.200
Rainfall intensity = 3. 056 (In/Hr) for a 100.0 year storm
Subarea runoff = lS.139(CFS) for 7.0S0(Ac.)
Total runoff = 55.954(CFS) Total area = 20.530(Ac.)
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Process from Point/station 10.000 to Point/Station 40.000
**** SUBAREA FLOW ADDITION ****
SINGLE FAMILY (1 Acre Lot)
Runoff Coefficient = 0.838
?>
,
Decimal fraction soil group A = 0.000
Decimal fraction soil group B = 0.500
Decimal fraction soil group C = 0.000
Decimal fraction soil group D = 0.500
RI index for soil(AMC 3) = 82.30
Pervious area fraction = 0.800; Impervious fraction = 0.200
Time of concentration = 12.68 min.
Rainfall intensity = 3.056(In/Hr) for a 100.0 year storm
Subarea runoff = 42.069(CFS) for 16.420(Ac.)
Total runoff = 98.023(CFS) Total area = 36.950(Ac.)
End of computations, total study area = 36.95 (Ac.)
The following figures may
be used for a unit hydrograph study of the same area.
Area averaged pervious area fraction(Ap) = 0.800
Area averaged RI index number = 65.5
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T.E.C. Temecula Engineering Consultants
Land Planning, civil Engineering, Construction Consultants
43180 Business Park Drive, suite 103
Temecula, California 92590
Tel:(909)676-1018 Fax: (909)676-2294
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Inside Diameter
( 30.00 in.)
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*
*
*
*
*
*
^^^^^^^^^^^^^^^^^^^^^ ^
* Water *
* *
* * ( 16.63 in. )
( 1. 386 ft. )
* * I
* *
* v
- - --
Circular Channel section
Flowrate ..................
Velocity ..................
Diameter of Pipe...........
Depth of Flow..............
Depth of Flow..............
critical Depth ............
Depth/Diameter (D/d) .....
Slope of Pipe .............
X-Sectional Area ..........
Wetted Perimeter ..........
AR^(2/3) ..................
Mannings 'n' ..............
Min. Fric. Slope, 30 inch
Pipe Flowing Full.......
29.804
10.668
30.000
16.630
1. 386
1. 867
0.554
1. 500
2.793
4.199
2.129
0.013
0.528 %
CFS
fps
inches
inches
feet
feet
20
o
sq. ft.
feet
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