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• <br />HYDROLOGIC DOCUMENTATION <br />SMALL AREA EXEMPTION <br />AREA 2 <br />The following calculations demonstrate [ha[ Area 2 meets the intention of [he CDMG Regulations, Section <br />4.0.2(3). The analysis vvas conducted on the entire 0.4 acrc reclaimed site. <br />Runoff peak discharge and sediment calculations were performed utilizing the SEDCAD+ computer model. The <br />analysis was conducted using a 10-year, 24-hour storm event. <br />j~ dv r~inga~ Tnputs <br />The curve numbers (CN) used were obtained from Procedures for Determining Peak Flows in Colorado and <br />Technical Release No. 55. Based on soil type and vegetation cover, curve numbers were determined for the <br />following condition. <br />Reclaimed <br />Soil T}pe: B (Topsoil) <br />Ground Cover: Good <br />Cover Type: Herbaceous <br />CN: 62 <br />• <br /> <br />All other hydrology inputs arc sho~~m on the attached SEDCAD+computer printouts <br />Reclaimed <br />Soil Type: <br />K factor <br />Average Slope <br />Avcrage Slope Length <br />C: <br />P: <br />CP: <br />Peak Discharge: <br />Runoff Volume: <br />Scdimen[olagy Results <br />Sediment: <br />Peak Settleable Concentration: <br />(Topsoil) <br />32 <br />20 <br />40 ft <br />O.Od2 (no canopy, 60% ground cover) <br />0.65 (moderate roughness) <br />0.27 <br />0.0 cfs <br />0.0 ac-ft <br />0.0 tons <br />0.0 ml/I <br />12-0 ~ <br />S~Brn~T-rAL AnTE 1~-/t7 /96 <br />