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SYMBOL DESIGNATION: <br />Reclaimed Mine Site = R <br />Natural Conditions = N <br />USING THE UNIVERSAL SOIL LOSS EQUATION <br />A= R K L S C P <br />A is the soil loss in Tons/Acre/Year <br />"C" - Crop Management_- R <br />5lv <br />1, Canopy 1-7-.5% - i I �' <br />U Cover - Grass 21 7%� ^ <br />Ground Cover 34:9%�� 0.028 <br />"C" - Crop Management - N <br />R <br />N <br />R = <br />rainfall factor <br />35.00 <br />35.00 <br />K = <br />soil erodibility factor <br />0.32 <br />0.32 <br />LS = <br />combined length slope factor <br />0.029 <br />Assume 400' Slope 5% Grade <br />1.00 <br />1.00 <br />C <br />= cropping management factor: <br />"C" - Crop Management_- R <br />5lv <br />1, Canopy 1-7-.5% - i I �' <br />U Cover - Grass 21 7%� ^ <br />Ground Cover 34:9%�� 0.028 <br />"C" - Crop Management - N <br />Canopy 1-9.5% <br />Cover - Grass 6G-.-9% <br />Ground Cover 2.3.0% <br />0.029 <br />• P = erosion control practice <br />factor <br />1.00 <br />1.00 <br />SEDIMENT VOLUME <br />AREA R K <br />LS <br />C <br />P A <br />R 35 0.32 <br />1.0 <br />0.028 <br />1.0 0.31 <br />N 35 0.32 <br />1.0 <br />0.029 <br />1.0 0.33 <br />It can be seen from the above calculation that the reclaimed <br />mine site may loose about 0.31 tons per acre per year to <br />erosion. The natural conditions may loose about 0.33 tons <br />per acre per year to erosion. <br />The above calculation demonstrates that untreated drainage from <br />the reclaimed area will contribute slightly fewer suspended <br />solids than untreated drainage from the natural surrounding <br />area. <br />RUNOFF.WK1 <br />• <br />4-19iii <br />10-02-92 <br />-77� 1 <br />