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TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK D&F PITS RSA&B 02-04 PRE-MINING <br /> <br />?.I <br />Area 204.9 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 II): 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 X1 11, 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 />( D pit range sites A&B previously determined under SL-1) <br />( F pit range sites A&B previously determined under SL-6) <br />Site Len th ftSlo % <br />D Pit RSA 371 13.4 <br />D Pit RSB 483 15.3 <br />F Pit RSA&B 537 19.6 <br />Overall Average 464 16.1 <br />Time of Concentration <br />Land Use Category <br />Slope <br />Length (ft) <br />Tc (hrs) <br /> <br />09/12/2008 <br />SCADINPS2.xIs, D&F RSAB <br />1 Forest with heavy ground litter (overland flow) <br />16.1% <br />464 <br />0.127