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SENECA II-W <br /> <br />• <br />• <br />TR-59 <br />Channel PM-1 System <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 . <br /> Channel PM-1 B <br /> Watershed ID -Structure 2 - SWS1 <br />Watershed Area: <br />8.5 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Aspen/Mountain Shrub Good (>70%) B 30 5.4 <br />brush <br />S Good (>70%) C 47 3.1 <br />age <br />Total 8.5 <br /> CURVE NUMBER 36 <br /> SEDCAD 4 <br /> Channel PM-1 B <br /> Watershed ID -Structure 2 - SWS2 <br />Watershed Area: <br />14.8 <br />Curve Number: Postmine Conditions <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Good (>70%) C 71 14.8 <br />Total 14.8 <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 />20-1.142 <br />Revised 05/07 <br />