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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br /> <br /> <br />004A - Gulch A Watershed SEDCAD Model Input <br />Structure 4, Subwatershed 1 (S4-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 0 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 35.37 acres <br />Undisturbed: 32.81 acres <br />Total Subwatershed Area: 68.18 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />35 600 Upland <br />125 800 Grassed Waterway <br />75 875 Grassed Waterway <br />280 950 Grassed Waterway <br />275 1600 Channel w/Baseflow <br />Curve Number: 52 <br />Sediment: <br />Rainfall Factor: 19 <br />Soil Erodibility Factor: 0.28 <br />Length-Slope Factor.' <br />Elevation Length Slope <br />200 1650 12.1% <br />300 1000 30.0% <br />195 600 32.5% <br />Average <br />232 1083 24.9% <br />Control Facfor. 0.04 <br />Practice Factor: 0.63 <br /> <br />