35 Ill. Adm. Code 501.360
Revised Universal Soil Loss Equation Version 2 (RUSLE2)
Section 501
Section 501.360
Revised
Universal Soil Loss Equation Version 2 (RUSLE2)
a)Â Â Â Â Â Â Â Â The equation for calculating soil loss
due to erosion is as follows:
Where:
a
i
=
long-term average soils loss for the i
th
day;
r
i
ri
=
erosivity factor;
k
i
=
soil erodibility factor;
l
i
=
soil length factor;
S
=
soil steepness factor;
c
i
=
cover management factor; and
p
i
=
supporting practices factor,
all on the i
th
day, except for slop
steepness factor (S).
b)Â Â Â Â Â Â Â Â 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:Â 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.