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, l r . -....,." , , . . I~.., '" .) OPERATION ANI) \IclINTENANCE 2.\ Ana to the Coast Highway at Corona Del Mar. This extension was completed in February 1944. In September 1946 the City of Brea and the unincorporated area of Fairview Farms in Orange County became a part of the Metropolitan Water District by annexation to the Coa~tal District. To serve Brea its water system was con- nected to the Orange County feeder b)' means of a 10-inch pipe line 700 feet long constructed by District forces in May 1947. Con- struction of the San Diego aqueduct from the west portal of San Jacinto tunnel to San Vicente reservoir of the San Diego city water system was completed in November 1947, The lateral 6.84 miles in length to supply West Basin Municipal Water District from the Palos Verdes feeder has been under construction by contract during the year and was two-thirds completed on June :30, 1949. Work was just getting under way as the fiscal year ended on the mile- / long San Marino lateral from the upper feeder in Pasadena, and a construction contract had been awarded for the 2,8-mile Victoria Street lateral from the Palos Verdes feeder to furnish additional service to Compton and Long Beach. A map of the distribution system showing the location of the reservoirs, pipe lines., Roftening plant, and constituent areas form- ing the Metropolitan Water District is displayed on pages 26 and 27. A map of the constituent areas of the San Diego County Water Authority and the San Diego aqueduct is shown on page 35. The original cost of the water distribution system, the cost of additions and betterments, and the net cost after credits as of June 30,1949 are shown in table 5, The estimated cost of the northerly half of the San Diego aque- duct is also shown. This amount is to be paid in installments with- out interest over a period of 30 years, Stomge in fAlke Mathews On June 30, 1948 available storage in Lake Mathews was 100,121 acre-feet, The lowest storage during the year was 88,454 acre-feet on September 3, 1948 and the highest 100,260 acre-feet on March 27 and 28 and April 7 and 8, 1949. On June 30, 1949 available storage was 99,488 acre-feet, Since the minimum main aqueduct delivery is a one-pump flow of about 200 cubic feet per second, and the flow required to be diverted to San Jacinto regulating reservoir was practically constant at an average of about 100 cubic feet per second, an almost continuous delivery to Lake Mathews resulted. For most of the year this delivery approximated one