PERMFILE42224

• Permit No: C1981025A
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Section_Exhibit Name: 4.0 OPERATION AND RECLAMATION STATUS
• Media Type: D
• Archive: Yes

USING THE UNIVERSAL SOIL LOSS EQUATION
SYMBOL DESIGNATION:
Reclaimed Mine Site = R
Natural Conditions = N
A= R K L S C P

A is the soil loss in Tons/Acre/Year
R = rainfall factor
K = soil erodibility factor
LS = combined length slope factor
Assume 400' Slope 5% Grade
C = cropping management factor:
"C" - Crop Management- R v
11,, ~ Canopy la.-5% - ,' I ~'
~lU ~ Cover - Grass 21 7 % 5~ ,^
Ground Cover 34:9%~/
"C" - Crop Management - N
Canopy 1-9:5%
Cover - Grass 6-.-9%
Ground Cover 2.3:0%
P = erosion control practice factor
SEDIMENT VOLUME
AREA R K LS
R 35 0.32 1.0
N 35 0.32 1.0
R N
35.00 35.00
0.32 0.32
1.00 1.00
0.028
0.029 ~
1.00 1.00
C P A
0.028 1.0 0.31
0.029 1.0 0.33
It can be seen from the above calculation that the reclaimed
mine site may loose about 0.31 tons per acre per year to
erosion. The natural conditions may loose about 0.33 tons
per acre per year to erosion.
The above calculation demonstrates that untreated drainage from
the reclaimed area will contribute slightly fewer suspended
solids than untreated drainage from the natural surrounding
area.
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RUNOFF.WK1
4-19 iii
10-02-92
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