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In February 2023, in coordination with Zone 7 and DSRSD, staff performed testing on <br /> TO 1-5 to determine the total flow capacity of the turnouts. The total capacity for TO 1-5 <br /> is 14,800 gallons per minute. The total turnout flow capacity was then compared to <br /> known City water system demands (see Figure 2). The results show that TO 1-5 can <br /> produce enough flow to meet demands experienced during the current mandatory <br /> drought 15 percent water conservation (14,600 gallons per minute), but cannot meet <br /> demand experienced prior to drought conditions which is shown in Figure 2 as year <br /> 2020 demand (17,200 gallons per minute). As part of the Water Supply Alternatives <br /> Study, staff is identifying TO 1-5 and distribution system improvements that could meet <br /> existing and future demands, although these improvements are not available in the near <br /> term to address the capacity short fall discussed herein. <br /> Figure 2. Turnout capacity and water demand comparison. <br /> Zone 7 Turnout capacity and Demand Comparision <br /> 18000 <br /> 16000 <br /> _14000 <br /> Estimated Max Day <br /> C 1=M Demand <br /> Et <br /> a 10000 <br /> e <br /> s <br /> '$ 8000 -Tested Turnout <br /> Total Flow Capacity <br /> og 6000 <br /> 4000 <br /> 2000 <br /> 0 <br /> Yeat 2C_ .::;n 1S%Cor4etwac' '.car 20:0 <br /> Dtmand Gond-^ <br /> If city water demands exceed the capacity of TO 1-5, large portions of the water system <br /> would likely no longer be able to provide consistent and reliable service to customers. <br /> Specifically, this could include low or zero water pressure, empty reservoirs, and loss of <br /> water flow for firefighting. Also associated with low or loss of system pressure is the <br /> potential for contamination of the water distribution system.. a properly pressurized water <br /> system is very effective at keeping contaminants out of the water supply; loss of system <br /> pressure could likely result in water quality concerns. <br /> As noted earlier in this report, the testing results show that the turnouts can produce <br /> enough flow to meet demands experienced during the current mandatory 15 percent <br /> water conservation. But as the turnouts cannot meet demand experienced prior to <br /> drought conditions, continued conservation remains necessary to reduce summer peak <br /> water demand because of water distribution capacity limitations related to the City's <br /> groundwater wells not being in operation. <br /> Page 3 of 5 <br />