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Table 6. SEDCAD Variables and Basis for Selection <br /> Premining <br /> Parameter Trapper's Trapper's basis for selection Division's Comment <br /> Selection <br /> Produces the minimum 0.5 inch A greater than 100-year event is necessary <br /> Design 2.75 inches of runoff necessary to in modeling as SCS TR55 questions the <br /> Event in 24 hours maintaining program accuracy accuracy of the Curve Number method <br /> (SL22 application Sec 1.4.2). when runoff depth is less than 0.5 inch. <br /> 48 AMC Trapper's selected cover, soil <br /> CN II, 68.2 group, hydrologic conditions Reasonable as per selections of cover, soil <br /> group, hydrologic conditions and C factor. <br /> AMC III and CP factor(see below). <br /> Oak/Aspen— Permit application,Appendix Q Reasonable as per pre-mining conditions. <br /> Mountain/Brush Section XII <br /> "Fair" hydrologic Permit application,Appendix Q Reasonable as per description of"Fair" in <br /> condition Section XII SCS TR55 <br /> Reasonable, as per soil types on bond <br /> Hydrologic soil group Permit application,Appendix Q release blocks delineated on map M29 & <br /> classification "B' Section XII <br /> consistent with soil group B. <br /> CP Factor: 0.050 <br /> Tables 2.3 &4.4-2 of permit Selection accounts for total cover and <br /> application C1981010 canopy cover of premining vegetation. <br /> Slope data on Summary pages Slope lengths and land use description <br /> Time of Concentration in SEDCAD runs inputs accurately matched field data. <br /> Permit Number C 1981010 <br /> SL22 Page 15 of 18 <br />