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Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC INPUT PARAMETI=RS <br />• <br />• <br />• <br />TR-37 <br /> SEDCAD 4 <br /> Channel YPM-1-2 <br /> Watershed ID -Structure 3 - SWS 1 <br />Nlest side subwatershed <br />Watershed Area: 3.1 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reciaimed Fair (30% - 70%) B 71 2.6 <br />Aspen/Mountain Shrub Good (>70%} B 30 0.6 <br />Total 3.1 <br /> CURVE NUMBER. 64 <br /> SEDCAD 4 <br /> Channel YPM-1-2 <br /> Watershed ID -Structure 3 - SWS2 <br />East side subwatershed <br />Watershed Area: 7.8 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 7.2 <br />Sagebrush Good (>70%) C 47 0.6 <br />Total 7.8 <br /> CURVE NUMBER 69 <br />Vegetation caver canditicns presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Easeline Report, Yoast Study Area (ESCO Associates, 1993). Approved Yoast Mine curve numbers are <br />presented in Attachment 13-12, Postmining Drainage and Sediment Control ,Table 13-12.1. Values were <br />adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service, <br />1986. <br />13-12.3-18 <br />Revised 02/08 <br />