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U <br />HYDROLOGIC DOCUMENTATION <br />SMALL AREA EXEMPTION <br />AREA 1 <br />The following calculations demonstrate that~eets the intention of the CDMG Regulations, <br />Section 4.0.2(3). The analysis was conducted on [he entire 0.6 acre reclaimed site. <br />Runoffpeak 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 />Hydrology Inputs <br />The curve numbers (CN) used were obtained from Procedures for Deternuning 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 Type: B (Topsoil) <br />Ground Cover: Good <br />Cover T}pe: Herbaceous <br />CN: 62 <br />• <br />• <br />All other hydrolog}• inputs are shown on the attached SEDCAD+ computer printouts <br />Sedimentolovey Inputs <br />Reclaimed <br />Soil Type: <br />K factor <br />Average Slope <br />Average Slope Length <br />C: <br />P: <br />CP: <br />Hydrology Results <br />Peak Discharge: <br />Runoff Volume: <br />Sedimentoloa• Results <br />Seduuent: <br />Peak Settleable Concentration: <br />(Topsoil) <br />32 <br />20 <br />40 R <br />0.042 (no canopy, 60% ground cover) <br />0.6~ (moderate roughness) <br />0.27 <br />0.0 cCs <br />0.0 ac-R <br />0.0 tons <br />0.0 mVl <br />TK-fl ~ <br />s~Brn,T"!^L DATE 9//196 <br />