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<br />.~ ....... t'" ("" <br />".W.J <br /> <br />CHAPTER ~ <br /> <br />, <br /> <br />OPERATION AND MAINTENANCE <br /> <br />DISTRIBUTION SYSTEM <br /> <br />THE distribution system, designed for wholesale delivery of <br />water to the component areas of the Metropolitan Water <br />District, does not supply water directly to the individual house- <br />holder, industry or farmer. The original system begins with a main <br />storage reservoir known as Lake Mathews, south of the City of <br />Riverside_ The 242-mile main aqueduct delivers Colorado River <br />water into the reservoir as required to mailltain an ample reserve <br />supply, Flow from this reservoir into the upper feeder pipe line is <br />regulated by the outlet tower and headworks_ Upon completion of <br />the San Diego aqueduct there was added to the distribution system <br />the northerly half of the aqueduct extending from the west portal <br />of San Jacinto tunnel 36.3 miles to the siphon at San Luis Rey River_ <br />The total length of completed distribution lines is now approxi- <br />ma tely 205 miles. <br /> <br />Storage il1 Lake Mnthew8 <br /> <br />On June 30. 1947 available storage in Lake Mathews was 89.012 <br />acre feet. Inflow was maintained at the rate of 400 cubic feet pel' <br />second to July 27 when the available storage had reached 99,869 <br />acre feet. Inflow was then continued at the rate of 200 cubic feet <br />per second until August I, at which time pumping was stopped for <br />four months to permit grouting operations in San Jacinto tunnel. <br />At the end of this shutdown period. November 30. 1947. the storage <br />was down to a low for the year of 72.606 acre feet. Delivery to <br />Lake Mathews was resumed on December 1 at the rate of approxi- <br />mately 100 cubic feet per second, the other half of a flow of 200 <br />cubic feet per second being diverted to the San Jacinto reservoir on <br />the San Diego aqueduct system. From December 29. 1947 until <br />January 17. 1948 there was no flow to Lake Mathews. During this <br />period a one-pump flow of 200 cubic feet per second was carried <br />in the aqueduct about half of the time. and all of this flow was <br />diverted to the San Jacinto reservoir_ <br />From January 17 through April 5, 1948 Lake Mathews again <br /> <br />r 25 J <br />