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TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK A,DBH PITS RSC 87-99 POST-MINING <br />Area 134.2 acres <br />Curve Number <br />Hydrologic Soil Group: B (Permit C-81-010, Appendix O, Section XII) <br />Cover Type: Pasture, Grassland, or Range <br />Hydrologic Condition: Good <br />CN (AMC II): 61 (SEDCAD 4 CN table -Other Agricultural Lands) <br />CN (AMC III): 62.2 (Barfield, Wamer, Haan p. 84) <br />Erodibility Factor <br />K: 0.25 (Permit No. C-81-010, Appendix O, Section XIII, Table E-4) <br /> <br />Control Factor <br />Type and Height of Canopy: None <br />Canopy Cover; None <br />Percent Ground Cover. 86.1 (Trapper Mine Phase II Bond Release App., Table 2.2-1) <br />CP: 0.015 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br />Roughness Modifier: 0.65 (Contour farming operations, effective herbaceous cover, <br /> contour ditches, livestock water tanks) <br />Modified CP: 0.01 <br />Average Slope and Slope Length <br />Site <br />A8D Pit RSC <br />H-Pit RSC <br />Average <br />Overall average <br />Time of Concentration <br />Land Use Category <br />Sbpe <br />Length (h) <br />Tc (hrs) <br />Len th tt Sio a °/ <br />495 15.2 <br />Elevation <br />en th Chance Sloce t%) <br />200 15 7.5 <br />320 25 7.8 <br />550 47 8.5 <br />200 10 5.0 <br />250 25 10.0 <br />500 65 13.0 <br />337 31 8.6 <br />416 11.9 <br />1 Forest with heavy ground litter (ovedand flow) <br />11.9% <br />416 <br />0.132 <br />SCADINPS2.xls. AD6H FtSC <br />