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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />008A -West Pit Watershed SEDCAD Model Input <br />Structure 4, Subwatershed 1 (S3-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 0 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 14.72 acres <br />Undisturbed: 15.03 acres <br />Total Subwatershed Area: 29.75 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />120 1300 Grassed Waterway <br />180 800 Channel wtBaseflow <br /> Curve Number.' 51 <br /> Sediment: <br /> Rainfall Factor 19 <br /> . <br /> Soil Erodibility Factor: 0.28 <br /> Length-Slope Factor: <br /> Elevation Length Slope <br /> 225 750 30.0% <br /> 210 1200 17.5% <br /> Average <br /> 217.5 975.0 23.8% <br /> Control Factor: 0.04 <br /> Practice Factor: 0.64 <br />i• <br />