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• <br />• <br /> <br />Yoast Mine <br />Stockpond ST-1 As-Built Report <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel YPM-1-1 <br /> Watershed ID -Structure 1 - SWS1 <br />Watershed Area: 54.2 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 51,1 <br />Aspen/Mountain Shrub Good (>70%) C 41 2.4 <br />Sagebrush Good (>70%) C 47 0.7 <br />Total 54.2 <br /> CURVE NUMBER 69 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline 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 <br />Service, 1986. <br />TR-37 <br />20-1.2-E-13 <br />Revised 08/OS <br />