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AREA #2 - POND #2 <br />Pond Design <br />1. Drainage area: 5.12 acres <br />2. Equivalent drainage area: 5.12 acres <br />3. A. 10-year 29-hour storm = 1.8 in. <br />B. From runoff chart #85 = .65 in. <br />C. Total volume of runoff = .2773 acre-feet <br />9. Sediment storage from universal soil loss equation = <br />8.55 T/A/Y or .0754 acre-feet total for three years <br />5. Total sediment + runoff storage = .60 acre-feet <br />Spillway Design <br />1. Maximum flow of runoff (type II storm) = 11.2 CFS <br />2. From Manning Equation, a trapezoid ditch 5' wide at <br />bottom, 1~ slope and 2:1 sides at a flow elevation <br />.75' = 14.39 CFS <br />3. Crest of pond 1' above flow elevation of spillway <br />