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Peabody Sage Creek Mine <br />• PM -1 System Channel Designs <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD 4 <br />WATERSHEDID <br />Structure 13 - SWS1 <br />Channel PM- 61-ower <br />Postmine Desian <br />hed Area: <br />84.7 <br />Curve Number: <br />HYDROLOGIC CURVE T84. EA <br />WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER es) <br />Reclaim >3 years Good ( >70 %) B 62 7 <br />Total <br />7 <br />CURVE NU MBER 62 <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 />• <br />2.05.3- E2.H.37 Revised 12109 <br />