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<br />• <br />• <br /> <br />TR-37 <br />Yoast Mine <br />Postmine Channel Design <br />HYDROLOGIC IiVPUT PARAMETERS <br /> SEDCAD 4 <br /> Channel YPM-18 <br /> Watershed ID -Structure 4 - SWS1 <br />~P/atarshed Araa: 6.9 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE VEGETATION COVER SOIL GROUP NUMBER (acres) <br />laimed <br />R Fair (30% - 70%) B 71 6.88 <br />ec <br />Total 6.88 <br /> CURVE NUMBER 71 <br />Vegetation cover conditions presented in Tab 10, Vegetation, Attachment 10-1, 1990/1992 Vegetation <br />Baseline Repcrt, 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 fcr Smal! Watersheds, Technical Release No. 55, Soil Conservation Service, <br />1986. <br />13-12.3-19 <br />Revised 02/08 <br />