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r [ ~, t ~. ~. I 3'78;) ~ ". . .. Board of Directors The Metropolitan Water District of Sllllt.hl'l'lI California Building October 20, 1~61 Gentlemen: There is transmitted herewith the annual report of The Metropol- itan Water District of Southern California for the fiscal year ending Jnne ~O, 1961. This is the twenty-third annual report issued by the District and the tenth that it has been my privilege to transmit to you as General Manager and Chief Engineer, During these ten years the water deliveries from the aqueduct have increased from 197,208 acre-feet ill 1951-52 to 935,227 acre-feet in 1960-61, the population of the District has increased from 4,000,000 to over 7,500,000, the area included within the District increased from 1,555 square miles to 3,976 square miles, and the membership increased from 20 agencies with 28 Directors to 25 agencies with 43 members on the Board of Directors, Since the aqueduct was placed in operation in 1941. it has continued to be operated to meet the increasing demands of the District, and the $220 million expansion program to provide ad- ditional facilities, which was started in 1951-52, was nearing com- pletion. The aqueduct facilities which were completed in 1960 were placed in operation during the fiscal year and the designed capacity of 1,605 cubic feet per second was delivered to the District for the greater part of the year, The enlargement of Lake Mathews from 107.000 acre-feet to 182,000 capacity was completed. A total of 216 miles of large diameter distribution lines were added to the s,l'stem during the ten-year period, Under construction but not completed at the end of the fiscal year was the increase in capacity of the filtra- tion plant at La Verne from 200 million gallons a day to 400 million gallons a day and the new 200 million gallons a day filtration plant on the Lower Feeder. It is a pleasure to render this, my last report, to you and to pre- dict the successful performance of the District operations in the future to meet the water needs of Southern California until supple- mental water is imported from Northern California, While await- ing this supply every effort should be made to replenish the badly <lepleted underground water basins in Los Angeles and Orange Cou nties, Very truly yonrs, ROBERT B. DIEMER General Manager and Chief Engineer vii