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KERR COAL MINE <br />CALCULATED SEDIMENTOLOGY DATA <br />EXISTING POST MINE CONDITION TIPPLE AREA <br />SOIL ERODIBILITYFACTOR: <br />Soil Type Erodibility <br />Factor, K <br />Clay Loam 0.28 <br />SLOPE FACTOR: <br />Length Slope m Slope LS <br /> Angle Factor <br />(ft) (%) (deg) <br />450 0.5 % 0.3 0.3 0.15 <br />Average LS = 0.15 <br />The LS Factor was calculated by: <br />LS = (Slope Length/72.6)^m`(10.8`sin(s1ope angle) + 0.03) for Slopes < 9% <br />LS = (Slope Length/72.6)Am"(16.8"sin(slope angle) - 0.5) for Slopes > 9% <br />Where: <br />Slope < 3% m = 0.3 <br />Slope = 4% m = 0.4 <br />5%> Slope < 10% m = 0.5 <br />Slope >10% m=0.6 <br />COVER AND PRACTICE FACTORS: <br />Cover <br />Type Cover Canopy Cover <br />Factor, C Practice <br />Factor, P <br /> <br /> <br />Reclaimed 58% 0% 0.047 0.80 <br />ANNUAL SEDIMENT YIELD <br />The following spreadsheet calculates the predicted sediment yield for the project area. The gross sediment yield <br />is determined according to the Revised Universal Soil Loss Equation. <br />PARAMETER DESCRIPTION VALUE <br />Annual Rainfall Factor 16.50 <br />Soil Erodibility Factor 028 <br />Length Slope Factor 0.15 <br />Cover Factor 0.047 <br />Practice Factor 0.80 <br />Gross Annual Sediment Yield 0.03 tons/acre/year