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10 Job No. 2669.01 EE�I' y Ern ftE� ri 'UVEv DM.IIEI li' y F:::E�asi lillit Study <br />6.1 II[.:..: III III° III,,,, III rXIN WA"' II[;;; III IIG III s"'r III III c"'r III* III II[;;; "' "III III s <br />The Santa Ana water system has seven connection points with the Metropolitan Water District, SA-1 through SA- <br />7. Each station contains a pressure reduction controller to convert from MWD pressure to city water pressure. <br />MWD pressure typically ranges from 160 to 190 psig, per logs of plant operation. City water is typically <br />controlled at 63 to 75 psig. There are one to three pressure reducing valves at each station to regulate pressure, <br />sized for different flow rates. Flow at a station is typically manually set at a given rate for weeks or months at a <br />time, counting on the booster pumps to automatically cycle or change speed, to fine tune pressure in the <br />distribution system. A number of these pumps operate with Variable Frequency Drive controls to more closely <br />match the loads. <br />The flow through each of these connection points is shown in the following table, derived from the city's <br />Monthly Production Reports. This is monthly data for calendar year 2017 and is taken to be representative of <br />flows in typical years. <br />Total water delivered by MWD peaks in the fall months and is close to zero during January. Note that some <br />interconnection points were not used at all in 2017, and some were used minimally. (SA-5 was out of service, <br />per the 2017 Water Master Plan.) <br />The following table shows the Normal Operating Capacity for each MWD connection, as listed in the 2017 Water <br />Masterplan, and its equivalent in CFS. <br />CITY Of ' Vt 26 — 70 INewcairrribI 2 rGior)? <br />I cCainrrridk <br />PREVIEW Date: Nov 03, 2021 Workspace ID: WS00800354 Funding Opportunity Number: R22AS00023 <br />