Laserfiche WebLink
USING THE UNIVERSAL SOIL LOSS EQUATION <br />A=RKLSCP <br />A is the soil loss in Tons/Acre/Year <br />Original Reclaimed <br />Slope Slope <br />R = rainfall factor 30 30 <br />K = soil credibility factor - Absarokee 0.37 0.37 <br />LS = combined length slope factor <br />Original 255' Slope 46% Grade 27.4 <br />Reclaimed Slope 255' Slope 34% Grade 15.7 <br />C = cropping management factor: <br />"C" - Crop Management - Original <br />Canopy 75.0% <br />Cover - Grass 25.0% <br />Ground Cover 55.0% 0.095 <br />"C" - Crop Management - Reclaimed <br />Canopy 0.8% <br />Cover - Grass 30.0% <br />Ground Cover 74.5% 0.021 <br />P = erosion control practice factor 1.0 1.0 <br />Soil Loss <br />AREA R K LS C P A <br />Original Slope 30 0.37 27.3 0.095 1.0 26.4 <br />Reclaimed Slope 30 0.37 15.7 0.021 1.0 3.65 <br />It can be seen from the above calculation that the reclaimed slope of the mine site may <br />loose about 3.65 tons per acre per year to erosion. The original slope may loose about <br />26.4 tons per acre per year to erosion. The above calculation demonstrates that <br />untreated drainage from the reclaimed area will contribute fewer suspended solids to <br />stream flow or runoff outside the permit area as untreated drainage from the natural <br />surrounding pre-mining area. <br />4 of 4 7/08