State of Arizona, complainant v. State of California, Palo Verde Irrigation District, Imperial Irrigation District, Coachella Valley County Water District, Metropolitan Water District of Southern California, City of Los Angeles, California, City of San Diego, California, and County of San Diego, California, defendants : the United States of America and State of Nevada, interveners : State of Utah and State of New Mexico, impleaded defendants : report / Simon H. Rifkind, special master

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61 are not served at all. Irrigable acreage under distribution system in 1957 was 14,610 acres.56 The net area actually irrigated in 1956 was 9,460 acres.56* The Reservation Division receives its surface irrigation water from the Colorado River by means of the Ail-American Canal. Prior to the construction of this canal, diversions were made at Laguna Dam through the Yuma Main Canal.57 The principal works of the water distribution system are a network of canals and laterals taking out from the All-American Canal.58 In 1957 the wholly unlined distribution system comprised 76.5 miles of canals and laterals.69 Operation and maintenance are conducted by the Bureau of Reclamation which delivers water to the farmers' head-gates.60 5. Metropolitan Water District. The Metropolitan Water District is located on the coastal plain of Southern California, which is outside the drainage area of the Colorado River. Water is brought into the District from the River by means of trans-mountain diversions.61 The principal mountain ranges east of the general coastal plain area are the Santa Monica, San Bernardino, San Jacinto, Santa Ana and Laguna Mountains. There is no range of mountains on the coast in Southern California, however, and this factor accounts in part for the tremendous population growth in the area.62 B6Tr.8824(Steenbergen). 56aCalif. Ex. 375. Later figures are not in evidence. 57Tr. 8817-8818 (Steenbergen). 58See Calif. Ex. 371. B9Tr. 8833, 8840 (Steenbergen). 60Tr. 8819 (Steenbergen). "See Calif. Ex. 401. 62Tr. 9404-9406 (Morris).