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Peabody Sage Creek Mine <br />Pond 002 System <br />HYDROLOGIC INPUT PARAMETERS <br />Watershed Area: <br />29.5 <br />Curve Number: <br />SEDCAD4 <br />WATERSHED ID <br />Structure 7 - SWS1 <br />Channel PM -20 <br />HYDROLOGIC CURVE AREA <br />WATERSHED TYPE GROUND COVER SOIL GROUP I NUMBER (acres) <br />Reclaim >3 years Good ( >70 %) B 62 29.50 <br />Total <br />CURVE NUMBER <br />29.5 <br />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), Soil <br />Conservation Service, 1986. <br />SEDCAD4 <br />WATE RSHED ID <br />Structure 7 - SWS1 <br />:rshed Area: Channel PM -20 <br />29.5 <br />mentology: k Factor and Control Factor <br />VEGETATION YDROLOGIC k CONTROL AREP <br />WATERSHED TYPE COVER GROUP FACTOR FACTOR (acres <br />Reclaimed 77LOIL <br />B 0.24 0.043 29.5 <br />Total <br />29.5 <br />0.24 0.043 <br />The soil erodibility factor, "k- Factor", values were determined based on Seneca II soil survey information (see Tab 9, Exhibit 9- <br />1, Soil Type and Sampling Locations, and Attachment 9 -6 of the Seneca II Mine PAP) as presented in Soils of Colorado, <br />Loss Factors and Erodibility, Soil Conservation Service, 1983. <br />The Control Factor values were adapted from Seneca Coal Company mine permit application packages. They are <br />representative of regional conditions and previously approved by CDRMS in the Seneca II Mine PAP, Permit C -80 -003. The <br />values are based on Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and D.C. Yoder, coordinators, <br />1996. Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised Universal Soil Loss Equation <br />(RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture. <br />TRO1 -10 20.5.3- E2 -A1.79 12/10 <br />