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Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC INP~1T PARAMETERS <br />• <br />• <br /> SEDCAD 4 <br /> Channel YPM-1-2 <br /> Watershed cture 3 - SWS1 <br />West side subwatershed <br />Watershed Area: 3.1 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 2.6 <br /> Goad (>70%) B 30 0.6 <br />Aspen/Mountain Shrub <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 <br />CURVE <br />AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 7.2 <br /> Gocd {>70%) C 47 0.6 <br />Sagebrush <br />Total 7'a <br /> CURVE NUMBER 69 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Report, Yoast Sfudy 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 />1966. <br /> SEDCAD 4 <br /> Channel YPM-1-2 <br /> Watershed ID -Structure 3 - SWS1 <br />Sedimentology: k factor <br />AREA <br />SOILS MAP UNIT/SOILS <br />SERIES HYDROLOGIC SOIL GROUP k FACTOR (acres) <br />Reclaimed B 0'32 2 57 <br />53C/DIE/F - Winevada loam B 0.23 0.6 <br />3.1 <br />Total <br /> Weighted k Factor 0.30 <br /> <br />TR-37 <br />13-12.1-66 <br />Revised 02!08 <br />