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Table 8. SEDCAD Variables and Basis for Selection. <br /> Pre-mining <br /> Parameter Trapper's Trapper's basis for selection Division's Comment <br /> Selection pp <br /> Produces the minimum 0.5 inch A greater than 100-year event is necessary in <br /> 2.75 of runoff necessary to modeling as SCS TR55 questions the accuracy <br /> Design Event inches in 24 hours maintaining program accuracy of the Curve Number method when runoff <br /> Y <br /> (SL19 application Sec 1.4.2). depth is less than 0.5 inch. <br /> 48 AMC II, <br /> Trapper's selected cover, soil Reasonable as per selections of cover,soil <br /> CN group, hydrologic conditions and <br /> 62 AMC III CP factor see below . group, hydrologic conditions and C factor. <br /> Permit application,Appendix Q <br /> Oak/Aspen -Sage/Grass Reasonable as per pre-mining conditions. <br /> Section XII <br /> "Fair" hydrologic condition <br /> Permit application,Appendix Q Reasonable as per description of"Fair" in SCS <br /> Section XII TR55 <br /> Reasonable,as per soil types on bond release <br /> Hydrologic soil group Permit application,Appendix Q blocks delineated on map M29&consistent <br /> classification "B' Section XII <br /> with soil group B. <br /> CP Factor: 0.050 <br /> Tables 2.3&4.4-2 of permit Selection accounts for total cover and canopy <br /> application C1981010 cover of pre-mining vegetation. <br /> Slope data on Summary pages in Slope lengths and land use description inputs <br /> Time of Concentration SEDCAD runs accurately matched field data. <br /> Permit Number C 1981010 <br /> SL19 <br />