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Peabody Sage Creek Mine <br />Pond 002 System <br />HYDROLOGIC INPUT PARAMETERS <br />SEDCAD4 <br />WATERSHED ID <br />Structure 10 - SWS1 <br />Channel PM -4 Middle <br />rshed Area: <br />Curve Number: <br />.: <br />HYDROLOGIC CURVE AREA <br />WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER (acres) <br />Reclaim >3 years Good ( >70 %) B 62 68.76 <br />Total <br />CURVE NUMBER <br />M <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), <br />Soil Conservation Service, 1986. <br />SEDCAD4 <br />WATERSHED ID <br />Structure 10 - SWS1 <br />hed Area: Channel PM -4 Middle <br />68.8 <br />edimentology: k Factor and Control Factor <br />VEGETATION HYDROLOGIC k CONTROL AREA <br />WATERSHED TYPE COVER SOIL GROUP FACTOR FACTOR (acres) <br />Reclaimed Good ( >70 %) B 0.24 0.042 68.76 <br />Total <br />68.8 <br />0.24 0.042 <br />The soil erodibility factor, "k- Factor", values are based on Seneca II soil survey information (see Tab 9, Exhibit 9 -1, Soil <br />Type and Sampling Locations, and Attachment 9 -6 of the Seneca II Mine PAP) as presented in Soils of Colorado, Loss <br />Factors and Erodibility, Soil Conservation Service, 1983. <br />The Control Factor values are adapted from Seneca Coal Company mine permit application packages. They are <br />representative of regional conditions and previously approved by CORMS in the Seneca II Mine PAP, Permit C -80 -003. <br />The values are adapted from Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and D.C. Yoder, <br />coordinators, 1996. Predicting Soil Erosion by Water A Guide to Converation Planning with the Revised Universal Soil <br />Loss Equation (RUSLE). Agricultural Handbook 703. U.S. Department of Agriculture. <br />TRO 1 -10 20.5.3 -E2 -A 1.82 <br />12/10 <br />