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r� <br />• <br />1 r <br />u <br />Peabody Sage Creek Mine <br />PM -15 System Channel Designs <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD 4 <br />WATERSHED ID <br />Structure 2 - SWS1 <br />Channel PM -15 <br />Postmine Conditions <br />Watershed Area: <br />36.3 <br />Curve Number: <br />HYDROLOGIC <br />CURVE <br />AREA <br />WATERSHED TYPE <br />GROUND COVER <br />SOIL GROUP <br />NUMBER <br />(acres) <br />Reclaim >3 years <br />Good ( >70 %) <br />B <br />62 <br />29.73 <br />Reclaim >3 years <br />Fair (30 - 70 %) <br />B <br />71 <br />6.54 <br />Total <br />36.3 <br />CURVE NUMBER 64 <br />SEDCAD 4 <br />WATERSHED ID <br />Structure 2 - SWS2 <br />Channel PM -15 <br />Postmine Conditions <br />Watershed Area: <br />65.6 <br />Curve Number: <br />HYDROLOGIC <br />CURVE <br />AREA <br />WATERSHED TYPE <br />GROUND COVER <br />SOIL GROUP <br />NUMBER <br />(acres <br />Reclaim >3 years <br />Good ( >70 %) <br />B <br />62 <br />16.07 <br />Reclaim >3 years <br />Fair (30 - 70 %) <br />B <br />71 <br />49.53 <br />Total <br />65.6 <br />CURVE NUMBER 69 <br />Peabody Sage Creek Mine curve number (CN) values are based on CN values previously approved by CDRMS for the <br />Seneca II Mine, Permit C -80 -003. The CN values are presented in the Seneca II Mine PAP in Appendix 7 -12, Postiming <br />Drainage Control. Values are adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR -55), <br />Soil Conservation Service, 1986. <br />2.05.3 -E2.H -194 <br />Revised 12/09 <br />