TABLE 3: RUNOFF COEFFICIENTS "C" BY LAND USE AND TYPICAL INLET TIMES
LAND USE
Runoff Coefficients
Inlet Times (minutes)
Flat
Rolling
Steep
Commercial (CBD)
0.75
0.83
0.90
5
Neighborhood Commercial
0.50
0.60
0.70
To be Computed
Industrial
0.63
0.70
0.77
5 - 10
One-Acre Lots
0.26
0.30
0.34
Half-Acre Lots
0.31
0.35
0.39
Quarter-Acre Lots
0.36
0.40
0.44
10 - 15
Parkland
0.18
0.20
0.22
To be Computed
 
1.   Flat terrain 0 - 2% slopes.
2.   Rolling terrain 2 - 7% slopes.
3.   Steep terrain greater than 7% slopes
4.   Interpolation, extrapolation and adjustment for local conditions shall be based on engineering experience and judgment.