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<br />. <br /> <br />. <br /> <br />~-- <br /> <br />S = 0.0044 <br /> <br />Of = 0.463 l~_Ql 8/3 (0.0044) 1/2 = 14.73 cfs <br />m 1m <br /> <br />Use 1 - 30" CMP <br /> <br />Ditch 7, Overflow from Ditch 21 Section 2-2 <br />Qc = 148 cfs - 14.73 = 133.3 c s <br /> <br />Slope = 0.0005 <br />Side Slope = 3:1 <br />Mannings Coefficient = 0.035 <br />Oc = 133.3 cfs <br /> <br />Using the nomograph for this channel the flow (Oc) will require a bottom width of <br />25 feet and a depth of 2.7 feet. <br /> <br />The design of the overflow ditch given above is presented on Attachment 8B. <br /> <br />2. The flow (03) into the HCFCO ditch from ditch 4 is 12.9 cfs (refer to <br />Attachment No. 8C). <br /> <br />Given: <br /> <br />03 = 12.9 cfs <br />Vf = 3 fps <br />n = 0.024 (THO-Hydraulic Manual, Corrugated Metal Pipe) <br /> <br />Assume one pipe will be used <br /> <br />Minimum pipe size allowed = 24" (HCFCO Specifications) <br />A = 12.9 = 4.30 ft2 <br /> <br />. ... .,.... , '.> '., :. 3' .,.... '. .'.' . <br /> <br />... " ......:: '. . .: . <br /> <br />"0 ... ., <br /> <br />. . " . '0. . ..0 <br /> <br />, <br /> <br />o (pipe') = 4 (4.30) = 2.34 ft = 28.1 in <br /> <br />Use 0 = 30" CMP <br /> <br />Vf = 3 = 0.590 (30)2/3 (S)1/2 <br />U':'ON (I2') <br />S = 0.0044 <br />'" ...,.... .. . ,:. Of ,= 0:463 ,(21) '8/3 (0.0~44)1/2 =' .14.73 cfs <br /> <br />.,..-......-.. .. .'. ' . .-" ,.' "0.024 (N)' ".~ ." .... : '.' . "'..' ,. ,... .'. <br /> <br />. . .' .'.: .' ~ '0. . ~. '. . <br /> <br />. '; :.. . .~ . .. : ..' <br /> <br />.. . ~..' .0. .:, .: . <br /> <br />Use 1 '- 30" CMP <br /> <br />Ditch 8, Overflow from Ditch 4l Section 4-4 <br />Qc = 188 cfs - 14.73 = 173.3 c s <br /> <br />-22- <br /> <br />" ..... <br /> <br />. -. .....,...... ......,.;.,......... .'..............:... ....,.,. ...., ..':,.,'.. .'.7-1'-"" <br />