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TRAPPER MINE <br /> SEDIMENT LOAD DEMONSTRATION <br /> BLOCK F,L&Z PITS RSAB 17-19 PRE-MINING <br /> Area 298.3 acres <br /> Curve Number <br /> Hydrologic Soil Group: B (Permit C-81-010,Appendix Q,Section XII) <br /> Cover Type: Oak/Aspen-Sage/Grass (Permit C-81-010,Appendix Q,Section XII) <br /> Hydrologic Condition: Fair <br /> CN(AMC ll): 48 (SEDCAD 4 CN table-Arid&Semi-arid Rangelands) <br /> CN(AMC III): 68.2 (Barfield,Warner,Haan p.84) <br /> Erodibility Factor <br /> K: 0.25 (Permit No.C-81-010,Appendix Q,Section XIII,Table E-4) <br /> Control Factor <br /> Type and Height of Canopy: Appreciable brush-2 m fall ht. <br /> Canopy Cover: 50% (Permit C-81-010,Table 2.3-13) <br /> Percent Ground Cover: 55% (Permit C-81-010,Table 4.4-2,range site area-weighted data) <br /> CP: 0.050 (SEDCAD 4 table for Permanent Pasture, Rangeland) <br /> Average Slope and Slope Length <br /> Weighted <br /> Elevation Ave Slope <br /> Length Change Sloe % <br /> F,L&Z-Pit RSAB 719 119 16.8 16.7 <br /> 'Derived from"Average Hydraulic Length and Block Slopes for(SL-24)Phase II Bond Release"Table <br /> Time of Concentration <br /> Land Use Category 1 Forest with heavy ground litter(overland flow) <br /> Slope 16.7% <br /> Length(ft) 719 <br /> Tc(hrs) 0.193 <br /> Sedcad inputs SL24,F,L&Z RSAB Pre Mining 8/17/2023 <br />