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beak <br />EAST NINE SEDIP"ENTATION POND <br />Flow Design Calculation <br />1. Determine drainage area (Exhibit _) <br />Area 3 = 0.50 acres = 11.9% <br />Area 3A = 0.49 acres = 99.6% <br />Area 36 = 0.29 acres = 6.9% <br />Area 3C = 2.75 acres = 65.3% <br />Area Highway = 0.18 acres = 4.3% <br />Total Area = 4.21 acres = 100.0% <br />2. Determine weighted curve number (Pp2-5, 23 - SCS)(Ah1C II) <br />• Area 3 = 11.9% * 84CN = 999.6 <br />Area 3A = 11.6% * 89CN = 1032.4 <br />Area 36 = 6.9% * 84CN = 579.6 <br />Area 3C = 65.3% * 89CN = 5811.7 <br />Area Highway = 4.3% * 98CN = 421.4 <br />_> 8844.7 <br />_> 88.45 <br />_> 88 CN <br />3. Determine precipitation <br />l0yr -- 24 hr = 1.6" <br />25yr -- 24 hr = 1.8" <br />4. Determine volume of runoff for CN (Pp68,SCS) <br />