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• ~- <br /> <br />CRLCULRTION6 <br />Maximuum Discharge <br />12 inch CMP, 29.5 feet in length <br />Qm=CR 2GH <br />Qrt~=Maximum cfs <br />C=Coeff icent of discharge-Civil Engineering HandbooK, Table 8, page <br />4-40 = 0.48 <br />G=Gravity <br />H=Head in feet <br />R=Rrea of pipe in feet square <br />Qm=0.46(o.5ft > 2C32.2ft/sec )I.1fit <br />Dm=3.17cfs 3cfs <br />O=VR <br />V=Q/A <br />• V=3cfs/0.79ft <br />V=3.'~~•~ :/sec Oft/sec <br />Gate 0= ~~g For Rverage Retention Period Of 24 Hours <br />10 Y 24 hour event = 0.54 ac#ft <br />Q=(E~ e,c-ft # 43560 ft/ac)/(4B hrs#3600 sec /hr) <br />Ci=O. _._ <br />Ht='~' '. et: Havg=O.SSfeet <br />z <br />HaVC ",CV/2G) <br />hg=C.,"=<=:eent of head loss due to gate valves; Civil Engineering <br />Hand'. .. tablel8, page 4-71 <br />F:g=4~ ~. ". opening = 2 inches <br />V=VII'. ~. G~IJC.CJ/YV <br />V=O.S= - -..r'sec <br />Checr~~ '_'=VR; A=0/V=0.14/0.94=0.15fit 2inches of opening <br />R F 4 ^ISPOSAL AR A POND <br />• <br />10year-2=.t.our event = 3.35 ac-ft <br />O=(3.35 ac-fit # 43560 ft/ac)/(46 hrs # 3600 sec /hr) <br />