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<br />Peabody Sage Creek Mine
<br />Portal Sump Designs
<br />HYDROLOGIC INPUT PARAMETERS
<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 />SEDCAD 4
<br />WATERSHED ID
<br />WATERSHED ID
<br />Structure 1 - SWS1
<br />FA -7 Watershed
<br />Structure 1 - SWS1
<br />Watershed Area:
<br />9.7
<br />FA -7 Watershed
<br />Curve Number:
<br />Watershed Area:
<br />VEGETATION
<br />HYDROLOGIC
<br />CURVE
<br />AREA
<br />WATERSHED TYPE
<br />COVER
<br />SOIL GROUP
<br />NUMBER
<br />acres
<br />Disturbed Area
<br />Bare Ground
<br />C
<br />89
<br />9.7
<br />Total
<br />1 1
<br />9.7
<br />HYDROLOGIC
<br />CURVE NUMBER
<br />89
<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 />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 Erodibiliy, 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 CDRMS 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 />2.05.3 -E2.F -1.11
<br />12/09
<br />SEDCAD 4
<br />WATERSHED ID
<br />Structure 1 - SWS1
<br />FA -7 Watershed
<br />Watershed Area:
<br />9.7
<br />Sedimentology
<br />k Factor and Control Factor:
<br />VEGETATION
<br />HYDROLOGIC
<br />k
<br />CONTROL
<br />AREA
<br />WATERSHED TYPE
<br />COVER
<br />SOIL GROUP
<br />FACTOR
<br />FACTOR
<br />acres
<br />Topsoil Stripped/
<br />Bare
<br />C
<br />0.29
<br />1
<br />9.7
<br />Benches
<br />Total
<br />9.7
<br />0.29
<br />1.00
<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 Erodibiliy, 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 CDRMS 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 />2.05.3 -E2.F -1.11
<br />12/09
<br />
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