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<br />,~ <br />I <br /> <br />i <br />" <br /> <br />, <br /> <br />~ <br /> <br />. ' , 0 <br />....;:~ ...U <br /> <br />C llA PTER 1 <br /> <br />OPERATION AND MAINTENANCE <br /> <br />MAIN AQUEDUCT <br /> <br />THE Colorado River Aqueduct has two main subdivisions-the <br />main aqueduct and the distribution system, The main aque, <br />duct begins at Lake Havasu formed by Parker Dam on the <br />Colorado River and extends 242 miles to Lake Mathews on the east, <br />ern edge of the coastal basin, The distribution system begins with <br />Lake Mathews and extends to con,tituent areas throughout the <br />basin, and includes the northerly half of the San Diego aqueduct <br />which supplies San Diego County, Completed in 1939, the main <br />aqueduct includes 92 miles of 16,foot (liameter tunnel, 54 miles of <br />covered conduit, 64 miles of canal, 29 miles of inverted siphons, <br />Gene and Copper Basin dams and reservoirs, oue,half of the Parker <br />power plant, five pumping plants with a total lift of ~ feet, and a L1l".I1 <br />2:l0,kv transmission system bringing power from Hoover Dam to <br />operate the pnmping plants, The system was designed for an ulti, <br />mate capacity of 1.605 cubic feet per second, but operating experi, <br />ence indicates that the ultimate capacity will approximate 1,800 <br />cubic feet per second. The only portions of the system which were <br />not built to ultimate capacity initially were 22 miles of siphons, <br />which were constructed half capacity, and the pumping plants, at <br />which only 3 of the ultimate 9 pump units were installed, Two ad, <br />ditiona! pump units will be added at each of the five plan~s under a <br />construction program now under way, which is described in detail in <br />chapters 3 and 4. The aqueduct 'ystem has been in operation since <br />1939, and to date no emergency shutdowns have been required. <br />The cost of the main aqueduct features to June 30, 1953 is shown <br />in table 2. These co,ts include preliminary organization and sur, <br />vel's. right of way and lands. construction utilities, Parker Dam <br />and the District's share of the power plant, and subsequent addi, <br />tion, and betterments charged to capital account. <br /> <br />. i PUll/ping p[II'l/ts <br /> <br />The pumping plants were operated continuously throughout the <br />year. except for the period from the latter part of December to <br />middle of February, when maintenance work was in progress in <br /> <br />[ 15 ] <br />