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• <br />• <br /> <br />Seneca 11 Mine <br />Pond 004 <br />HYDROLOGIC INPUT PARAMETERS <br /> SEDCAD 4 <br /> WATERSHED ID <br /> Structure 1 - SWS1 <br /> Subwatershed -Channel PM-21 <br />Watershed Area: <br />29.8 <br />Curve Number: <br /> HYDROLOGIC CURVE AREA <br />WATERSHED TYPE GROUND COVER SOIL GROUP NUMBER (acres} <br />Reclaim >3 years Good (>70%) B 62 29.76 <br />Total 29.8 <br /> CURVE NUMBER 62 <br />Approved Seneca II Mine curve number (CN) values are presented in Appentlix 7-12, Postiming Drainage <br />Control. Values were adapted from Urban Hydrology for Small Watersheds, Technical Release No. 55 (TR- <br />55), Soil Conservation Service, 1986. <br />SEDCAD 4 <br />WATERSHED ID <br />Structure 1 - SWS1 <br />Subwatershed -Channel PM-21 <br />Watershed Area: <br />29.8 <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 29.76 <br />Total 29.8 <br />0.16 0.043 <br />The soil erodibility factor, "k-Factor', values were determined based on Seneca II soil survey information (see Tab 9, <br />Exhibit 9-1, Soil Type antl Sampling Locations, and Attachment 9-6) as presented in Soils o/Colorado, Loss Factors and <br />Erodibility, Soil Conservation Service, 1983. <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 <br />respective permit documents. The values are based on Renard, et al. (Renard, K.G., Foster, G.R., Weesies, G.A., <br />McCool, D.K., and D.C. Yoder, coordinators, 1996. Predicting Soil Erosion by Water. A Guide to Converafion Planning <br />with the Revised Universal Soil Loss Equation (RUBLE) .Agricultural Handbook 703. U.S. Department of Agriculture. <br />TR-42 <br />7-6c.1A-19 <br />Revised 09/07 <br />