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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />• 008A -West Pit Watershed SEDCAD Model Input <br />Structure 2, Subwatershed 1 (S7-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 60.94 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 35.15 acres <br />Undisturbed: 0 acres <br />Total Subwatershed Area: 96.09 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />80 2300 Upland <br />120 1000 Grassed Waterway <br />I • <br />Curve Number <br />Sediment: <br />Rainfall Factor: <br />Soil Erodibility Factor: <br />Length-Slope Factor.' <br />Elevation Length <br />80 1150 <br />155 1950 <br />Average <br />117.5 <br />Control Factor: <br />Practice Factor. <br />1550 <br />75 <br />19 <br />0.28 <br />Slope <br />7.0% <br />7.9% <br />7.5% <br />0.51 <br />0.38 <br />i• <br />