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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />004A - Gulch A Watershed SEDCAD Model Input <br />Structure 3, Subwatershed 1 (S3-SWS1) <br />Disturbance: <br />Topsoil & Seeded: 0 acres <br />1-2 Year Reclamation: 0 acres <br />3+ Year Reclamation: 98.30 acres <br />Undisturbed: 8.08 acres <br />Total Subwatershed Area: 106.38 acres <br />Hydrology: <br />Time of Concentration: <br />Elevation Length Description <br />35 650 Upland <br />275 1550 Grassed Waterway <br />155 1100 Channel w/Baseflow <br />Curve Number: 55 <br />• Sediment: <br />Rainfall Factor: 19 <br />Soil Erodibility Factor: 0.28 <br />Length-Slope Factor: <br />Elevation Length Slope <br />350 1775 19.7% <br />325 1375 23.6% <br />Average <br />338 1575 21.7% <br />Control Factor: 0.01 <br />Practice Factor: 0.42 <br />., <br />