HomeMy WebLinkAboutCT 75-04; Marmol Court; Drainage Study; 1991-04-05,-
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aJ c c1
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n h m * Lo
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6-Hour Precipitation (inches)
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RUKOFI: COEFFICIENTS (RATIONAL METHOD)
LAND USE
UndeveluRed
Residential:
Rura 1
Single Family
Multi-Units
Mobile Homes (2)
Commercial (2)
80% lmpervious
Industrial (2)
90% Impervious
Coefficient, C
Soil Group (1)
- A B c D . io .35 .40 .4!i
- ._ -
.45 .50 .60 . 70
.45 .50 .55 . G5
.70 .75 .80 . $5
.80 .85 .90 .95
" .. 0 le0 0
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 actual imperviousness values of 80% or 90%, the values given for coefficient
imperviousness to the tabulated imperviousness. However, in no case
shall the final coefficient be less than 0.50. For example: Consider
commercial property on D soil group.
Actual imperviousness = 50%
Tabulated imperviousness = 800:
Revised C = X 0.85 = 0.53 'SlT
..
.
ii ‘1
olo.5 0.7
JUNE 1948 Kz 0.6 J
-
U. S. PUBLIC ROADS ADMINISTRATION NOMOGRAPH FOR PIPE CULVERTS ,
DIVISION TWO WASHINGTON,D. C. WITH ENTRANCE CONTROL
CL”L /QOrc2k.
- " "' .. ~,"
Computed FiESLI1 ts:
Depth ............
Velocity.. .......
f-low A1-ea.. ......
Flow Top Width. ..
Wetted Perimeter.
Critical Depth.. .
Critical Slope.. .
Fr-oude Numbor. ...
..... :.
Depth.. ..........
Velocity .........
Flow Area.. ......
I'lour Tup b1id'k.h.. .
Wetted Perimeter.
Critical Depth.. .
Critical Slope.. .
Froude Number. ...