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TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK F8Z PITS RSAB 05-06 PRE - MINING <br />Area 165.5 acres <br />Curve Number <br />Erodibility Factor <br />K: <br />Control Factor <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 II): 48 (SEDCAD 4 CN table - Arid & Semi -arid Rangelands) <br />CN (AMC III): 68.2 (Barfield, Warner, Haan p. 84) <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 />F -Pit RSAB <br />Z -Pit RSAB <br />Overall average <br />Time of Concentration <br />Average <br />Average <br />0.25 (Permit No. C -81 -010, Appendix Q, Section XIII, Table E -4) <br />Elevation <br />Length Change Slope ( %) <br />450 130 28.9 <br />1230 185 15.0 <br />840 180 21.4 <br />600 95 15.8 <br />1200 195 16.3 <br />1000 85 8.5 <br />870 115 13.2 <br />884 141 17 <br />600 130 21.7 <br />1100 210 19.1 <br />900 200 22.2 <br />1150 80 7.0 <br />570 100 17.5 <br />864 144 17 <br />874 142 17 <br />Land Use Category 1 Forest with heavy ground litter (overland flow) <br />Slope 17.0% <br />Length (ft) 874 <br />Tc (hrs) 0.233 <br />SCADINPS2 xls, F&Z RSAB 02/17/2012 <br />