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<br />1 <br /> <br />1 <br /> <br />1 <br /> <br />b. Design Criteria: <br /> <br />I <br /> <br />Hydraulics - Although ~ive Alternates are presented for con- <br /> <br />sideration, the design criteria is consistent in each: <br /> <br />I <br /> <br />Capacity: Single Family Equivalent Taps - t173.2 <br /> <br />I <br /> <br />Average consumption per day: (173.2 STE)(3.5 persons/STE) <br />( 55 gpd) = 39403 gpd <br /> <br />I <br /> <br />Average quantity <br />average Q <br /> <br />(Q) = 27.35 gallons per minute and 150% of <br />Q150 = 41.04 therefore use <br /> <br />I <br /> <br />Q150 = 42 gpm <br />Q150 = 60480 gpd <br /> <br />, <br /> <br />At. a maximum velocity, V =' 5 feet per second (fps), and ut ilizing _ <br />an 8" diameter pipe <br /> <br />I <br /> <br />Q8 = VA . therefore use . <br />Q8 = (5fps)(0.342 sq. ft.) <br />Q8 = 1. 71 cfs <br /> = t758 gpm <br /> <br />I <br /> <br />I <br /> <br />therefore an 8" diameter waterline is acceptable for the main <br />transmission and feeder line. <br /> <br />I <br /> <br />As a comparison to see if the hydraulic capacities of a 5" line <br /> <br />can meet demand and be used as a transmission line from the point of diversion <br /> <br />I <br /> <br />to the storage tank: <br /> <br />I <br /> <br />Q5 = VA <br /> = ( 5fps) (0.342 sq.ft. ) <br /> = 0.98 cfs <br /> = :!:440 gpm <br /> <br />I <br /> <br />therefore, a 5" diameter waterline could be used for the transmission line from <br /> <br />1 <br /> <br />diversion to tank. Also, this is the minimum diameter of pipe to be used in the <br /> <br />Town's distribution system. <br /> <br />1 <br /> <br />Although line capacities are greater, the systems initial control on <br /> <br />1 <br /> <br />growth is the 150 gpm filter in the treatment plant (two additional ones can be <br /> <br />13 <br /> <br />1 <br />