HomeMy WebLinkAboutCT 83-19; Calavera Hills Pump Station #2; Hydrology Report; 1986-10-03+. i
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L.WD USE
Undeveloped
Residential:
Rural
RUKOFF COEFFICIENTS (RATIONAL METHOD)
Single Family
Nulti-Units
Mobile Homes (2)
Commercial (2)
80% Impervious
Industrial (2)
90% Impervious
Coefficient, C Soil Group (1)
- A B C
.30 .35 .40
- -
. 30 . J> .10 "
.40 .45 .50
.45 .so .60
.15 .50 . 55
.70 .75 .80
.80 .as .90
- D
.45
.55
. 70
.63
.s5
.95
NOTES :
(1) Obtain soil group from maps on-file with the Department of Sanitation and Flood Control.
(2) Where actual conditions deviate significantly from the tabulated
C. may be revised by multiplying 80% or 90% by the ratio of aczual imperviousness values of 80% or 90%, the values given for coefficienr
shall the final coefficient be less than 0.50. For example: Consider imperviousness to the tabulated imperviousness. However, in no case
commercial property on D soil group.
Actual imperviousness = 50%
Tabulated imperviousness = 8Ooi
Revised C = X 0.85 = 0.55 3-5
i: T !E Y .
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0 8N
Y( LL
Revised 1/55 APPENDIX XI-E
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NESTE, BRUDIN & STONE mmmmm
UDINEERS - PLANNERS --. ~.
/ cut slope
3" 470-C.2000 concrete or 3" 2500 psi, air placed concrete
be rounded at the option with 1VxlX" 17 gage stucco
of the contractor. netting.
NPE A BROW DITCH NPE B -
3" 470-C.2000 concrete or bottom may be rounded at
the option of the contractor. with 1VxlX" 17 gage stucco
~~ 3" 2500 psi. air placed concretm'
netting.
NPE C TERRACE DITCH TYPE D
NOTES
2 Over slope down ditches shall employ 6" thickened edge section
1. Longitudinal slope of lined ditch shall be E4 minimum.
at both sides of ditch.
LEGEND ON PLANS "-
A