Illinois Administrative Code
Title 35 - ENVIRONMENTAL PROTECTION
Part 501 - GENERAL PROVISIONS
Subpart B - DEFINITIONS AND INCORPORATIONS
Section 501.360 - Revised Universal Soil Loss Equation Version 2 (RUSLE2)
Current through Register Vol. 48, No. 38, September 20, 2024
a) The equation for calculating soil loss due to erosion is as follows:
Where:
|
ai |
= |
long-term average soils loss for the ith day; |
|
ri |
= |
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, (202) 720-3656.
