Laserfiche WebLink
TRAPPER MINE <br />SEDIMENT LOAD DEMONSTRATION <br />BLOCK A,F, K &Z PITS RSAB 09-13 PRE -MINING <br />Area 376.1 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 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 />A,F,K&Z-Pit RSAB 675 94 14.9 15.3 <br />*Derived from "Average Hydraulic Length and Block Slopes for (SL -19) Phase II Bond Release" Table <br />Time of Concentration <br />Land Use Category <br />Slope <br />Length (ft) <br />Tc (hrs) <br />1 Forest with heavy ground litter (overland flow) <br />15.3% <br />675 <br />0.191 <br />Sedcad inputs SL19 xls, A,F,K&Z RSAB Pre Mining 8/4/2017 <br />