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KERR COAL MINE <br />CALCULATED SEDIMENTOLOGY DATA <br />PRE-MINE CONDITION TIPPLE AREA <br />SOIL EROWBILITY FACTOR: <br />Soil Type Erodibility <br />Factor, K <br />Clay Loam 0.28 <br />SLOPE FACTOR: <br />Length Slope m Slope <br /> <br />I <br />Angle aj <br />ft (%) (de <br />50 0.5 % 0.3 Average LS = 0.15 <br /> <br />The LS Factor was calculated by: <br />LS = (Slope Length172.6)^m'(10.8'sin(slope angle) + 0.03) for Slopes < 9% <br />LS = (Slope Length172.6)Am'(16.8'sin(s1ope 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 Cover Canopy Cover Practice <br />Type Factor, C Factor, P <br /> (%) (%) <br />Tipple Referance Area 45% 25%1 0.117 1.00 <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 0.12 <br />Practice Factor 1.00 <br />Gross Annual Sediment Yield 0.08 tons/acre/year