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• <br />• <br />• <br /> <br />TR-37 <br />Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC fyPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel YPM-19 <br /> Watershed ID - Structur 1 <br />Watershed Area: 9.3 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fav (30°!° - 70a/°) B 71 6.2 <br />Aspen/Mountain Shrub Good (>70%) g 30 0.7 <br />Aspen/Mountain Shrub Good (>70%) C 41 0.2 <br />Sagebrush Good (>70%) 6 35 0.4 <br /> Good (>70%) C 47 1.9 <br />Sagebrush <br />' Total 9.3 <br /> CURVE NUMBER 61 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, ?990/1992 Vegetaticn <br />Baseline Report, Yeast Study Area (ESCO Associates, 1993). Approved Yeast Mine curve numbers are <br />presented in Attachment 13-12, Fostmining Drainage and Sediment Control, Table 13-12.1. Values were <br />adapted frcm Urban Hydrology for Small Watersheds, Technical Release No. 55, Soil Conservation Service, <br />1986. <br />13-12.3-21 <br />Revised 02/08 <br />