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SENECA II-W <br />Channel PM-2 System <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel PM-2A <br /> Watershed ID -Structure 4 - SWS1 <br />Watershed Area: <br />4.5 <br />Curve Number: <br /> VEGETATION HYDROLOGIC CURVE AREA <br />WATERSHED TYPE COVER SOIL GROUP NUMBER (acres) <br />Aspen/Mountain Shrub Good (>70%) B 30 3.48 <br />Sagebrush Good (>70%) C 47 0.99 <br />Total 4.47 <br /> CURVE NUMBER 34 <br /> SEDCAD 4 <br /> Channel PM-2A <br /> Watershed ID -Structure 4 - SWS2 <br />Watershed Area: <br />41.3 <br />Curve Number: Postmine Conditions <br /> VEGETATION HYDROLOGIC CURVE AREA <br />WATERSHED TYPE COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Good (>70%) C 71 41.30 <br />Total 41.30 <br /> CURVE NUMBER 71 <br />Approved II-W Mine curve numbers are presented in Appendix 13-56, Postmining Drainage and <br />Sediment Control ,Table 1, Seneca II-W (South Expansion Area) Curve Numbers. Values were <br />adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation <br />Service, 1986. <br />• <br />• <br />• <br />TR-59 20-1.164 Revised 05/07 <br />