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.. <br />ruz. r~cxr~ sAVAC~ <br />Page 6 <br />January 7, 1981 <br />Pond 1 <br />Drainage - 600' x 290' = 3.99 acres <br />Consider the surface to be a road <br />c = 92 <br />CN 92, 3.0" stone yields 2.16" of runoff <br />2.16" x 3.99 acres = 8.62 acres inches = .72 acre/ft. <br />_ .7 <br />.7 Idmoff storage required <br />Sediment storage <br />Use .1 ac/ft per acre <br />.1 ac/ft x 3.99 acres = 3.99 ac/ft <br />_ .4 ac/ft <br />7.bta1 Pond size = .7 + .4 = 1.1 ac/ft <br />fond 2 <br />700' x 120' = 1.93 acres <br />CN = 92, 3.0" storm yields 2.16" of runoff <br />2.16" x 1.93 acres = 4.17 acre inches <br />_ .35 ac/ft runoff storage <br />Sediment storage <br />.l ac ft/ac ,x 1.93 acres = 1.93 ac/ft <br />Zbtal Pond storage = .35 + .19 = .54 ac/ft <br />Collection Ditch 1-a, 1-b 2-a, 2-b <br />Grade - 1 percent <br />Peak discharge 2.9(.5) = 1.9 cfs <br />n = .045 <br />Walls 1:2 slope <br />D = 2.67 1.9 <br />38.39 (.Old <br />= 2.65 .495 <br />_ .77 feet = 9.6" <br />add 1/2" freeboard <br />= 16 inches <br />