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<br />, ~ '. '\ <br />::. )..... ,. <br /> <br />CHAPTER 2 <br /> <br />OPERATION AND MAINTENANCE <br /> <br />DISTRIBUTION SYSTEM <br /> <br />THE District distribution system is not a distribution system <br />in the usual sense. since water is not delivered to individual <br />users, but is furnished in wholesale quantities to member <br />agencies for retail distribution. The system supplying the member <br />areas in Los Angeles and On\l1ge counties begins with Lake Math- <br />ews, a main storage reservoir located south of the City of Riverside. <br />Colorado River water is delivered by the 242-mile main aqueduct <br />into this reservoir as required to maintain usable storage of from <br />80,000 to 100,000 acre-feet. Discharge from Lake Mathews intu <br />the upper feeder of the distribution system is controlled by an outlet <br />tower and head works. Wholesale distribution of the water is then <br />accomplished through a system of conduits totaling 177.6 miles in <br />length, with diameters ranging from 16 to 152 inches. <br />Delivery to San Diego County is made through the 71.1-miie <br />San Diego aqueduct, which branches from the main aqueduct at the <br />west portal of San Jacinto tunnel. The District is responsible for <br />the operation and maintenance of the northerly 36.3-miie portion of <br />the San Diego aqueduct, ownership of which is being acquired by <br />annual pay'ments to the San Diego County Water Authority which <br />in turn is acquiring the entire aqueduct in accordance with its <br />contract with the U.S. Government. The District portion of the <br />San Diego aqueduct added to the system served by Lake Mathews <br />makes a total length of distribution system of 213.9 miles. <br /> <br />Pipe lines Q,nd 1oeservo-irs <br /> <br />The upper feeder consisting of concrete pipe, steel pipe, and <br />tunnels, extends 61.2 miles from Lake Mathews to the Eagle Rock <br />control tower on the westerly boundary of the City of Pasadena. <br />The capacity of the upper feeder is 750 cubic feet per second to the <br />San Dimas turnout and 510 cubic feet per second from that point <br />to Eagle Rock. Near La Verne the flow is diverted into a water <br />treatment plant where it is softened and filtered and returned to <br />the upper feeder for distribution to District areas. Deliveries of <br /> <br />[ 26 1 <br /> <br />1 <br />J <br />