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DETERMINATION OF FORCE MAIN CAPACITY <br />AND FUTURE TTE-TNS TO 6T11 AVENUE -12'm STREET FORCE MAIN <br />y .. <br />I . SCOPE <br />This study will determine the range of flows applicable to a 6" PVC force main <br />between velocities of 2.5 feet per second and 5.0 feet per second; present ex- <br />isting flow data; inventory existing potential sources of pollution, eg., <br />existing sewage treatment facilities; inventory potential primary users•of the <br />existing force main; estimate sewage flows of inventoried potential users; <br />tabularize potential sewage flows by users and determine reserve capacity, if <br />any, of the existing force main. <br />II DETERMINATION OF FORCE MAIN FLOW RANGES <br />Existing force main size = 6" <br />From Q = AV Where Q = Flow Rate <br />A = Cross Section Area <br />Q(2.5 fps) _ (.20 ft2)(2.5 feet per second) V = Velocity <br />.49 cfs = 317,260 gallons per day (Minimum Flow Rate to provide <br />scouring) <br />Q(5.0 fps) _ (.20•ft2)(5.0 feet per second) = 1.0 cfs <br />- 646,317 gallons per day (Maximum Flow Rate allowable) <br />III EXISTING FORCE MAIN FLOW DATA . <br />Currently the existing force main ddlivers sewage flow from [he Vero *call only. <br />As there is not a meter on the existing force main, it will. be assumed all flow <br />is due to water use within the Mall. Therefore, it is necessary to tabulate <br />existing water use. The data presented below represents actual water use of <br />the Mall as reported by the City of'Vero Beach. It will be assumed 100% of <br />water used is•returned .to the sewer system. <br />DATE WATER USE PER MONTH 14ATFR USE PER DAY <br />January 1979 583,000 gallons 18,806 <br />February 1979 750,000 gallons 26,786 <br />March 1979 686,000 gallons 22,129 <br />Average Day = 22,573 Gallons Per Day <br />Present sewage flow in force main = 22,573 gallons per day <br />(Flow from Vero :fall) <br />• r <br />t <br />�j <br />aQQK 39 PACE 487 <br />APR 1979 <br />