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KENNECOTT ENERGY CORPORATION <br />COLOWYO MINE <br />Streeter Watershed SEDCAD Model Input <br />Structure 3, Subwatershed I <br />Disturbance: <br />Topsoil& Seeded: <br />1-2 Year Reclamation: <br />3+ Year Reclamation: <br />Undisturbed: <br />Total Subwatershed Area: <br />Hydrology: <br />Time of Concentration: <br />6.23 acres <br />0 acres <br />22.72 acres <br />61.00 acres <br />89.95 acres <br />Elevation Length Description <br />25 132 Upland <br />38 271 Grassed Channel <br />75 2454 Diversion <br />Curve Number 52 <br />Sediment: <br />is Rainfall Factor. 19 <br />Soil Erodibility Factor 0.28 <br />Length -Slope Factor: <br />Elevation Length Slope <br />125 670 18.7% <br />150 1000 15.0% <br />75 760 9.9% <br />Average <br />117 810 14.5% <br />Control Factor 0.11 <br />Practice Factor: 0.73 <br />Exh. 7 -SP -12 Revision Date: 2/1/06 <br />Revision No.: TR -63 <br />