WSP04825 - Laserfiche WebLink

Home Browse Search

i ~ , r r I I ,I Ii ~ ~ ,I r I I I f l r" ~ '!\ ..t\i.'J..L. - . CHAPTER 3 DISTRIBUTION SYSTEM A GENERAL description of the initial development of the dis- tribution system extending from Lake Mathews to the Dis- trict cities has been given in the two previous reports. The record of construction is continued in this chapter, and the opera- tional features are summarized. Water is now being regularly released froll1 Lake Mathews, softened and filtered at the La Verne plant and at the close of the fiscal year was being distributed through the feeder lines to Pasadena, Los Angeles (Ascot reser- voir only), Compton, Burbank, . Beverly Hills. and Santa Monica, the last named city drawing its entire supply from the Colorado Ri vel' aqued uct. Opcmtion Feat"res A map of the system and diagrammatic profiles indicating the operational characteristics of the feeders are shown in figures 3 and 4. For controlling the release of water from Lake Mathews, its transmission through the feeders and its delivery to the member cities there have been provided appropriate types of valve and metering equipment. The operating structures include outlet towers at the reservoirs, a manifold and valve st,ructure at the headworks, and a number of division structures, sectionalizing valves, pressure regulating and relief valves, check valves and flow meters at suitable points along the feeders and laterals. Water enters the Lake Mathews outlet tower at selected levels through ports controlled by 30-inch hydraulically-operated gate valves, and flows out through the base of the tower into the 14-foot diameter outlet tunnel which conveys it 2,348 feet to the headworks manifold. The water pressure in the manifold varies according to the stage of the water in Lake Mathews, which rises to elevation 1357 when the reservoir is full. Before beginning its long journey through the upper feeder the water must be released from the manifold at measured rates into the open paoloI' forebay of the headworks, from which entry to the upper feeder is provided [35 ]