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<br />Seneca II Mine
<br />Pond 004
<br />HYDROLOGIC INPUT PARAMETERS
<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 />WATERSHED ID
<br />e Structure 7 - SWS -1
<br />Structure 7 - SWS -1
<br />Subwatershed - Channel PM -12 Lower
<br />Watershed Area:
<br />Watershed Area:
<br />78.4
<br />Curve Number:
<br />Sedimentology: k Factor and Control Factor
<br />HYDROLOGIC
<br />CURVE
<br />AREA
<br />WATERSHED TYPE
<br />GROUND COVER
<br />SOIL GROUP
<br />NUMBER
<br />(acres)
<br />Reclaim >3 years
<br />Good ( >70 %)
<br />B
<br />62
<br />32.06
<br />Sagebrush
<br />Fair
<br />D
<br />70
<br />46.38
<br />Total
<br />0.043
<br />32.06
<br />Sagebrush
<br />Fair
<br />78.4
<br />0.37
<br />CURVE NUMBER
<br />46.38
<br />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 />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) as presented in Soils of Colorado, Loss Factors and Erodibility,
<br />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 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. Yoder, coordinators, 1996. Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised
<br />Universal Soil Loss Equation (RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture.
<br />TR -42 2.05.3 -E2.0 -1.24 R"qy 09/07
<br />SEDCAD 4
<br />WATERSHED ID
<br />Structure 7 - SWS -1
<br />Subwatershed- Channel PM -12 Lower
<br />Watershed Area:
<br />78.4
<br />Sedimentology: 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 />Reclaimed
<br />Good ( >70 %)
<br />B
<br />0.16
<br />0.043
<br />32.06
<br />Sagebrush
<br />Fair
<br />D
<br />0.37
<br />0.042
<br />46.38
<br />Total
<br />78.4
<br />0.28
<br />0.042
<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) as presented in Soils of Colorado, Loss Factors and Erodibility,
<br />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 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. Yoder, coordinators, 1996. Predicting Soil Erosion by Water. A Guide to Converation Planning with the Revised
<br />Universal Soil Loss Equation (RUSLE) . Agricultural Handbook 703. U.S. Department of Agriculture.
<br />TR -42 2.05.3 -E2.0 -1.24 R"qy 09/07
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