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Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel YPM-18 <br /> Watershed fD -Structure 4 - SWS1 <br />Watershed Area: 71 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />Reclaimed Fair (30% - 70%) B 71 6.88 <br />Total 6.88 <br /> CURVE NUMBER 71 <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 /> <br />• <br /> <br />TR-36 13-12.3-18 Revised 08/07 <br />