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• <br />Seneca II-W Mine <br />005 Gulch Postmine Channel Design <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD4 <br /> WATERSHED ID <br /> 005-E2 <br /> S4-SWS-1 <br />Watershed Area: <br />8.5 acres <br />Curve Number: <br />WATERSHED VEGETATION HYDROLOGIC CURVE AREA <br />TYPE COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair: 30-70% B 70 6.3 <br />Sagebrush Fair: 30-70% B 51 2.2 <br />Total 8.5 <br /> CURVE NUMBER: 65 <br />Curve number (CN) values used are approved Seneca II-W CN values (North Area; see Table 13-1 ). <br />Values were adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR-55), <br />Soil Conservation Service, 1986. <br />• <br />Revised 05/07 <br />TR-59 20-1.10 <br />