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I r l r , ~ " I \ r'"/Q t...-au CHAPTER c OPERATION AND MAINTENANCE DlSTRllJUTIO;\ SYSTEM The distribution system is designed for strictly wholesale deliv- ery of water to the component members of the Metropolitan Water District and does not supply water directly to the individual house- holder, industry, or farmer. The sj'stem properly begins with a main storage reservoir known as Lake Mathews, into which the 242-mile main aqueduct delivers Colorado River water liS required to maintain ample reserve. Flow from this reservoir into the upper feeder pipe line is regulated by an outlet tower and the headworks. PipE l.i-nes a.-ita. 1'e.sc'rvoirs The upper feeder consisting of pl1'cast concrete pipe, steel pipe, tunnels, and cast-in-place concrete canyon crossings extends 60.8 miles from Lake Mathews to the Eagle Rock control tower, on the westerly boundary of the City of Pasadena. Its caplicity is 750 cubic feet per second to the San Dimas turnout lind 510 cubic feet per second from that point to Eagle Rock. Near La Verne in Los Angeles County, the flow of the upper feeder is diverted at a turn- out structure into the water softening and filtration plant, softened and filtered and returned to the upper feeder for distribution to District areM. The City of Pasadena is supplied directly from the Plisadena tunnel of the upper feeder through a riser pipe at Moun- tain Street and Manzanita Avenue. This riser is connected to a large city main which delivers water to nearby Sunset reservoir. There are at present three main branches extending from points on the upper feeder southerly and westerly into the metropolitan area, with laterals as required to carry water to the member cities. The Orange County branch takes off from the upper feeder at the softening plant turnout structure and runs in a southerly direction 40.3 miles to connect with the existing Laguna Beach main supply line near Corona del Mar. Direct connections are made from the Orange County branch to the city systems of Fullerton, Anaheim, and Santa Ana at points designated by these cities. Two reser- voirs on this line provide storage and flow regulation. [ 27 ]