HomeMy WebLinkAboutPD 09-02; ENERGY EFFICIENCY MANAGEMENT; DRAINAGE REPORT; 2009-08-26DRAINAGE REPORT
FOR.
CLARK RESIDENCE
2732 CAZADERO DRIVE
DWG # 463-9A
PROJECT # PD-09-02
PREPARED FOR
Energy Efficient Management
- . P.O. Box 1612
Union City, CA 94587
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PREPARED BY
The Sea Bright Company
4322 Sea Bright Place
Carlsbad, CA 92008
August 26, 2009
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San Diego County Hydrology Manual Section: 3 Date: June 2003 Page: 6 of 26
Table 3-1
RUNOFF COEFFICIENTS FOR URBAN AREAS
Land Use Runoff Coefficient "C"
Soil Type
NRCS Elements A B C
Undisturbed Natural Terrain (Natural)
Low Density Residential (LDR)
Low Density Residential (LDR)
Low Density Residential (LDR)
Medium Density Residential (MDR)
Medium Density Residential (MDR)
Medium Density Residential (MDR)•.
Medium Density Residential (MDR)
High Density Residential (HDR)
High Density Residential (HDR)
Commercial/Industrial (N. Com)
Commercial/Industrial (G. Corn)
Commercial/Industrial (O.P. Corn)
Commercial/Industrial (Limited I.)
Permanent Open Space 0* 0.20 0.25 0.30 0.35 C....ME
Residential, 1.0 DU/A or less 10 0.27 0.32 0.36 0.41
Residential, 2.0 DU/A or less 20 0.34 0.38 0.42 0.46
Residential, 2.9 DU/A or less 27°A - 25
---W
0.38 0.41 0.45 0.49 -
Residential, 4.3 DU/A or less 30 0.41 0.45 0.48 0.52
Residential, 7.3 DU/A or less 40 0.48 0.51 0.54 0.57
Residential, 10.9 DU/A or less 45 0.52 0.54 0.57 0.60
Residential, 14.5 DU/A or less 50 0.55 0.58 0.60 0.63
Residential, 24.0 DU/A or less 65 0.66 0.67 0.69 0.71
Residential, 43.0 DU/A or less . 80 0.76 0.77 0.78 . 0.79
Neighborhood Commercial 80 0.76 0.77 0.78 0.79
General Commercial 85 0.80 0.80 0.81 0.82
Office Professional/Commercial 90 0.83 0.84 0.84 0.85
Limited Industrial 90 0.83 0.84. 0.84 0.85
General Industrial 95 0.87 0.87 - 0.87 0.87
'The values associated with 0% impervious may be used for direct calculation of the runoff coefficient as described in Section 3.1.2 (representing the pervious runoff
coefficient, Cp, for the soil type), or for areas that will remain undisturbed in perpetuity. Justification must be given that the area will remain natural forever (e.g., the area
is located in Cleveland National Forest).
DU/A = dwelling units per acre
NRCS National Resources Conservation Service
(ç4Ckrr
36
EQUATION
AE
Tc= (11:1!3 \O385
Feet AE
-5000 Tc = Time of concentration (hours)
- L = Watercourse Distance (miles) ..-4000 AE = Change in elevation along
effective slope line (See Figure 3-5)(feet)
—3000 Tc
Hours Minutes
-2000 4 240
- 3 . 180
-1000 -900
800 2-- 120
-'Wa - -100
_go
-.-Soo -80
-400 \ -70
- 1-60 -300
- \\ -50
-200 -40 -
- L
- Miles Feet
\ 3
1 -100
-
- -4000 -20 - \• -18
-3000 -16 0.5- -50
- -14
-40 2000 -12 • -1800 -1600 -10
-900
L 10
-700
-600
Soo 4
-400
300
200 r U3 Tç
AE Tc I Q1 MQ WA AU
Owe SOURCE: California Division of Highways (1941) and Kirpich (1940)
Ft GU RE
Nomograph for Determination of
Time of Concentration (Tc) or Travel Time (It) for Natural Watersheds r3.4
jflC'1 (5r-F M)(1..
EQUATION
______7.44 P6 Di-0.645
IIIIIIIIIIIIIIIIIHIllhIII1IIIIIIIIHh!!IIIIIIIIlIII1IIll!HhIIII
U..'...
RECEIVED
AUG 3 12009
ENGINEERING
DEPARTMENT