TABLE 2: RURAL RUNOFF COEFFICIENTS *

Type of Surface	Runoff Coefficient C
Woodland (Sandy)
Flat (0-5% slope)	0.10
Rolling (5-10% slope)	0.25
Steep (greater than 10%)	0.30
Woodland (Clay)
Flat	0.30
Rolling	0.35
Steep	0.50
Pasture (Sandy)
Flat	0.10
Rolling	0.16
Steep	0.22
Pasture (Clay)
Flat	0.30
Rolling	0.36
Steep	0.42
Cultivated (Sandy)
Flat	0.30
Rolling	0.40
Steep	0.52
Cultivated (Clay)
Flat	0.50
Rolling	0.60
Steep	0.72

 

* From Ordinance 81-16, Tippecanoe County, Indiana, A General Ordinance Establishing Storm Drainage and Sediment Control, November 1981.

   The coefficients of this tabulation are applicable to storms of 5- to 10-year frequencies. Coefficients for less frequent, higher-intensity storms shall be modified as follows:

 

Return Period (years)	Multiply C by:
25	1.1
50	1.2
100	1.25

 

(Ord. 1995-10 Tab. 1A, passed 10-13-1995)