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Post-mining <br /> Variabl Trapper's <br /> e Selection Trapper's Source Division's Comment <br /> R 30 SCS Map: R factors for Colorado Reasonable, as per Trapper's location on R factor <br /> p map. <br /> Trapper Permit C1981010 Reasonable, as per soil types on bond release <br /> K 0.25 Appendix Q Section XIII Table E3 blocks delineated on ma M29. <br /> pp p <br /> LS 6.83 SCS LS Table 675 ft 15%Sloe Reasonable based on the 15%slope and 675 ft. <br /> p slope length <br /> NRCS C factor table for permanent <br /> pasture, rangeland, idle land and <br /> C 0.014 grazed woodland - no canopy, Reasonable as per vegetation data submitted <br /> 74.1 herbaceous cover, grass type with SL19 application (Table 1.2-1). <br /> (Table 1.2-1 of bond release <br /> application. <br /> P 1 NRCS P factor table for specified Reasonable, as no control practices were <br /> conditions employed. <br /> SEDCAD Comparison: Trapper utilized baseline data for selecting SEDCAD 4 parameters for <br /> modeling pre-mining conditions. Trapper utilized recent vegetative data in the bond release <br /> submittal for modeling post-mining conditions. The parameters employed in the SEDCAD model <br /> and their definitions are presented in the table below: <br /> Table 7. SEDCAD Parameters and their Definitions. <br /> Parameter Definition <br /> Design Event Climatic erosivity factor due to <br /> precipitation <br /> CN (Curve Number) Soil erodibility as a function of land <br /> use and hydrologic soil group. <br /> Land Use Slope length and steepness factor <br /> Hydrologic Condition Cover management/land use <br /> Hydrologic Soil Group Soil structure and infiltration rate <br /> CP Factor (Control <br /> Practice Factor) <br /> Time of Concentration Time for runoff in watershed to <br /> reach the watershed outlet. <br /> The parameters reasonably represent the conditions in the field for pre and post mining conditions. <br /> Permit Number C 1981010 <br /> SL19 <br />