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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />007A -Prospect Watershed SEDCAD Model Input <br />Structure 4, Subwatershed 1 (S4-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 6.27 <br />1-2 Year Reclamation: 72.87 acres <br />3+ Year Reclamation: 73.52 acres <br />Undisturbed: 2.98 acres <br />Total Subwatershed Area: 155.64 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />30 1175 Upland <br />50 400 Channelw/Baseflow <br />550 3100 Channel w/Baseflow <br />Curve Number: 59 <br />• Sediment: <br />Rainfall Factor: <br />19 <br /> <br /> Soil Erodibility Factor: 0.28 <br /> Length-Slope Factor: <br /> Elevation Length Slope <br /> 275 1300 21.2% <br /> 200 2075 9.6% <br /> 280 1150 24.3% <br />Average <br />252 1508 18.4% <br />Control Factor: 0.07 <br />Practice Factor: 0.39 <br />~~ <br />