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AREA #1 - POND #1 <br />Pond Design <br />1. Drainage area: 5.60 acres <br />2. Equivalent drainage area: 5.60 acres <br />3. A. 10-year 24-hour storm = 1.8 in. <br />B. From runoff chart #85 = .65 in. <br />C. Total volume of runoff = .3033 acre-feet <br />4. Sediment storage from universal soil loss equation = <br />3.5 T/A/Y or .0337 acre-feet total for three years <br />5. Total sediment + runoff storage = .3400 acre-feet <br />Spillway Design <br />1. Maximum flow of runoff (type II storm) = 11.5 CFS <br />2. From Manning Equation, a trapezoid ditch 5' wide at bottom, <br />18 slope and 2:1 sides at a flow elevation of .75' = 14.39 CFS <br />3. Crest of pond 1' above flow elevation of spillway <br />