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<br />AREA t<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 charti,~85 = .65 in. <br />C. Total volume of runoff = .3033 acre-feet <br />4. Sediment storage from universal soil loss equation = j <br />3.5 T/A/Y or .0337 acre-feet total for three years <br />~~ <br />5. Total sediment + runoff storage = .3370 acre-feet ~/ <br />Spillway Design ~.~' <br />1. Maximum flow of runoff (t}'pe II storm) = 11.5 CFS ~°y <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 flora elevation of spillway. <br />RECEIVED <br />AU G 13 1984 <br />MINED LAND RECIAMpnoN orvrsiON <br />Colo. Dept of Natural Resources <br />\J <br />