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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />• 010A -East Taylor Watershed SEDCAD Modei Input <br />Structure 2, Subwatershed 1 (S2-SWS7) <br />Disturbance: <br />Topsoil & Seeded: 17.29 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 43.01 acres <br />Undisturbed: 142.05 acres <br />Total Subwatershed Area: 202.35 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />300 1250 Grassed Waterway <br />330 3400 Channel w/Baseflow <br /> Curve Number: 52 <br />• Sediment: <br />Rainfall Factor: <br />19 <br /> <br /> Soil Erodibility Factor' 0.28 <br /> Length-Slope Factor: <br /> Elevation Length Slope <br /> 190 850 22.4% <br /> 250 1750 14.3% <br /> 110 850 12.9% <br /> 225 700 32.1% <br /> 300 1150 26.1% <br /> Average <br /> 215 1060 21.6% <br /> Control Factor: 0.12 <br /> Practice Factor: 0.75 <br />• <br />