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~ 6eak <br />Ppe.r'Y~~. 1C K ~ -- y <br />• Sf ~ WEST h1INE SEDI~4EWTATION POND <br />Flow Design Calculations <br />1. Determine drainage area (Exhibit _). <br />Area 4 = 2.78 acres = 35.9°0 <br />Area 4A = 3.33 acres = 43.0% <br />Area 4B = 0.57 acres = 7.4% <br />Area 4C = 0.53 acres = 6.8% <br />Area Highway = 0.54 acres = 7.0% <br />Total Area = 7.75 acres = 100.1% <br />2. Determine weighted curve number (Pp2-5,23-SCS)(A~1C II) <br />• Area 4 = 35.9% * 89CN = 3195.1 <br />Area 4A = 43.0% * 79CN = 3397.0 <br />Area 46 = 7.4% * 79CN = 584.6 <br />Area 4C = 6.8% * 89CN = 605.2 <br />Area Highway = 7.0% * 98CN = 686.0 <br />8467.9 <br />_> 84.68 <br />_> 85 CN <br />3. Determine precipitation <br />l0yr -- 24 hr = 1.6" <br />25yr -- 24 hr = 1.8" <br />4. Determine volume of runoff for CN85 (Pp65,SCS) <br />l0yr -- 24hr = 0.52 inches ~ 7,75 acres <br />= 4.03 acre inch <br />= 0.34 acre foot <br />Revision <br />February 1982 <br />