§501.360. Revised Universal Soil Loss Equation Version 2 (RUSLE2)

a)         The equation for calculating soil loss due to erosion is as follows:

 

 

Where:

 

ai	=	long-term average soils loss for the ith day;
riri	=	erosivity factor;
ki	=	soil erodibility factor;
li	=	soil length factor;
S	=	soil steepness factor;
ci	=	cover management factor; and
pi	=	supporting practices factor,
all on the ith day, except for slop steepness factor (S).

 

b)         The average annual soil loss is computed as follows:

 

 

Where:

 

A	=	average annual soil loss.
365m	=	number of days per year.
m	=	number of years in the analysis period.  The value for m is 1 for continuous vegetation on range, pasture, and other lands, where conditions are the same year after year, while m = the number of years of cropping management rotations on cropland and the number of years following a disturbance such as construction, logging, grading of a reclaimed surface mine, or closing of a land fill where conditions are changing year to year.

 

BOARD NOTE:  Soil loss may be calculated using Revised Universal Soil Loss Equation 2 (RUSLE2) software program available at http://fargo.nserl.purdue.edu/rusle2_dataweb/

RUSLE2_Index.htm. Additional information may be obtained from the United States Department of Agriculture, Agricultural Research Services, 1400 Independence Avenue, S.W., Washington DC 20250, [phone].

 

(Source:  Amended at 38 Ill. Reg. 17661, effective August 11, 2014)