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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />• 001A -Streeter Watershed SEDCAD Model Input <br />Structure 4, Subwatershed 1 (S4-SWS1) <br />Disturbance: <br />Topsoil 8 Seeded: 3.E17 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 27.70 acres <br />Undisturbed: 48.:11 acres <br />Total Subwatershed Area: 79.;8 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />75 600 Upland <br />83 650 Grassed Channel <br />13 1000 Channelw/Baseflow <br />Curve Number: 52 <br />• Sediment: <br />ll Factor: <br />R <br />i <br />f <br />19 <br /> a <br />n <br />a <br /> Soil Erodibility Factor.• 0.28 <br /> Length-Slope Factor: <br /> Elevation Length Slope <br /> 75 700 10.75% <br /> 125 700 17.9% <br /> 125 850 14.7`.'/0 <br />Average <br />108 750 14.4°''/0 <br />Control Factor: 0.08 <br />Practice Factor: 0.70 <br />• <br />