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<br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />System storage is needed to assure hourly and daily peaks can be satisfied <br />wi th i nf1 ows from the pi pel i ne si zed at a lO-day peak rate. For the case of <br />the maximum design flow of 3.02 cfs (l,355 gpm) daily peak, the peak 10-day <br />rate is 2.79 cfs (1,252 gpm). The 100 gpm differential must be supplied out <br />of storage for a portion of the 10-day period. It is estimated that 200,000 <br />gallons would satisfy this peaking difference. The same type of distribution <br />storage is needed to allow for the instantaneous peak over and above the daily <br />peak. We estimate that 300,000 gallons would serve this purpose. <br /> <br />For total system storage requi rements, these components, along with fi re-fl ow <br />reserves, are additive. The total storage needed to allow design flow <br />capacity to be based on lO-day peak rates would be 600,000 gallon fire-flow <br />storage, 300,000 gallon instantaneous to peak daily regu1 ati on, and 200,000 <br />gallon peak daily to peak lO-day regulation. A total storage of about <br />1,100,000 gallons should be arlequate for the ultil'late system to average out <br />peaks. <br /> <br />The other factor to consider is the reserve that would be available if the <br />pi pel i ne requi red bei ng taken out of servi ce for repai r. At the lO-day peak <br />rate of 1,252 gpm, the 1,100,000 total storage would last only 14.~ hours. If <br />the down ti~e occurred during an off-peak month, the storage supply could last <br />longer, possibly one day. If the monthly peak rate of 2.50 cfs (1,122 gpm) <br />were used with a requirement for one-day total storage, then 1,615,000 gallons <br />would be needed. <br /> <br />The existing 550,000 gallon tank, plus rehabilitation of the 1,000,000 gallon <br />tank woul d sati sfy a reasonab1 e storage for system peaki ng, fi re flows and <br />stand-by emergency reserve. <br /> <br />If multiple pressure zones are established, each requires separate storage. A <br />new pressure zone to serve a p1 anned housi ng expansi on area to the north of <br />Towaoc would therefore require a third tank, and the capacity would neerl to be <br />about 500,000 gallons just to provide distrib~tion storage and fire flows for <br />the pressure zone. The three tanks for three pressure zones coul d thus <br />ultimately provide about 2,100,000 gallons of system storage, which is even <br />more desirable from the standpoint of available emergency supply in case of <br />main pipeline outage. <br /> <br />3-10 <br /> <br />1060c <br />