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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />006A -Rail Loop Pond Watershed SEDCAD Model Input <br />Curve Number. 86 <br />Sediment: <br />• Rainfall Factor: 19 <br />Soil Erodibility Factor: 0.28 <br />Length-Slope Factor.' <br />Elevation Length Slope <br />5 475 1.1% <br />35 100 35.0% <br />Structure 1, Subwatershed 1 (S1-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 5.70 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 0 acres <br />Undisturbed: 0 acres <br />Total Subwatershed Area: 5.70 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />30 50 Grassed Waterway <br />5 725 Grassed Waterway <br />Average <br />20 287.5 18.0% <br />Control Factor: 0.80 <br />Practice Factor: 0.38 <br /> <br />