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Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel YPM-6-2 <br /> Watershed ID -Structure 9 - SWS1 <br />Watershed Area: 17.2 <br />West side subwatershed <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br /> <br />Aspen/Mountain Shrub <br />Good (>70%) C <br />41 4.78 <br />37 <br />12 <br />Reclaimed Fair (30% - 70%) B 71 . <br />17.2 <br />Total <br /> CURVE NUMBER 63 <br />SEDCAD 4 <br />Channel YPM-6-2 <br />Watershed ID -Structure 9 - SWS2 <br />Watershed Area: 20.3 <br />East side subwatershed <br />Curve Number: <br />• <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE <br /> <br />Reclaimed <br />Aspen/Mountain Shrub VEGETATION COVER <br />Fair 30% - 70% <br />( ) <br />Good (>70%) <br />>70%) <br />d <br />G SOIL GROUP <br />B <br /> <br />D <br />D NUMBER <br />71 <br /> <br />48 <br />55 (acres) <br />17.33 <br />1.01 <br /> <br />2.00 <br />Sagebrush <br />Total oo <br />( 20.3 <br />CURVE NUMBER 68 <br />Approved Yoast Mine curve numbers are presented in Appendix 13-12, Postmining Drainage and Sediment <br />Control ,Table 13-12.1. Values were adapted from Urban Hydrology for Small Watersheds, Technical <br />Release No. 55, Soil Conservation Service, 1986. <br />13-12.3-23 Revised 08/07 <br />TR-36 <br />