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<br /> <br />Seneca II Mine <br />Pond 004 <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> WATERSHED ID <br /> Structure 7 - SWS1 <br /> Subwatershed -Channel PM-12 Lower <br />Watershed Area: <br />78.4 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER acres) <br />Reclaim >3 years Good (>70%) B 62 32.06 <br />Sagebrush Fair D 70 46.38 <br />Total 78.4 <br /> CURVE NUMBER 67 <br />Approved Seneca II Mine curve number (CN) values are presented in Appendix 7-12, Postiming Drainage <br />Control. Values were 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 /> Structure 7 - SWS1 <br /> Subwatershed-Channel PM-12 Lower <br />Watershed Area: <br />78.4 <br />Sedimentology: 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 0.16 0.043 32.06 <br />Sagebrush Fair D 0.37 0.042 46.38 <br />Total 78.4 <br /> 0.28 0.042 <br />The soil erodibility factor, "k-Factof', values were tletermined based on Seneca II soil survey information (see Tab 9, Exhibit 9- <br />1, Soil Type and Sampling Locations, and Attachment 9-6) as presented in Soils of Colorado, Loss Factors and Erodibility, <br />Soil Conservation Service, 7963. <br />The Control Factor values were adapted from the Yoast and Seneca II-W permit application packages. These values are <br />presented in each permit in the Drainage and Sediment Control Plan attachment, which is located in Tab 13 of the respective <br />permit documents. The values are based on Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., McCool, D.K., and <br />D.C. Yotler, coordinators, 1996. Predicting Soil Erosion by Water: A Guide to Converation Planning with the Revised <br />Universal Soil Loss Equation (RUBLE) .Agricultural Handbook 703. U.S. Department of Agriculture. <br />TR-42 7-6c.1A-25 Revised 09!07 <br />