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Asd-2 <br />SEDIMENTATION RESERVOIR <br />• NAME: REFUSE DISPOSAL AREA - TOPSOIL STOCKPILE <br />I. RUNOFF AND VOLUMES <br />Determine: <br />Maximum runoff area and peak discharges <br />Reservoir liquid volume <br />Reservoir sediment volume <br />Total reservoir volume <br />Area: Area shall be for maximum size of topsoil stockpile At = 3.67 Ac <br />Undisturbed = 1.10 Ac <br />Disturbed = 2.57 Ac; Top = 1.26; 1~:1 slope = 1.08; road = 0.23 <br />Precipitation: <br />P10 = 1.7 inch(es) (10-year, 24-hour precipitation event <br />the Precipitation-Frequency Atlas of the West- <br />ern United States, Volume III - Colorado) <br />P25 = 2.1 inch(es) (25-year, 24-hour precipitation event <br />from the Precipitation-Frequency Atlas of the West- <br />• ern United States, Volume III - Colorado) . <br />Use CN~AVG of 80 - From Peak Flows in Colorado - Figure S-3 <br />with Soil Type C and Cover = 50% <br />Runoff: <br />From Table S-3 (page 60) <br />For P10 = 1.7 Q10 = 0.39 <br />P25 = Z.1 Q25 = 0.62 <br />Average Slope: <br />Undisturbed 1.10 acres x 20% = 22 <br />Top 1.26 acres x 07, = 0 <br />1.5:1 slope 1.08 acres x 150% = 189 <br />Road 0.23 acres x 8% = 1.84 <br /> 3.67 212.84 <br /> 58% slope <br />Slope Adjustment Factor = 1.17 <br /> <br /> <br />