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<br />... t'~,.. ........ <br />" ... ..11) <br /> <br />CHAPTER 1 <br /> <br />OPERATION AND MAINTENANCE <br /> <br />MAIN AQUEDUCT <br /> <br />I <br />Ii <br />I' <br /> <br />THE Intake pumping plant on the California shore of Lake <br />Havasu, approximately two miles upstream from Parker <br />Dam, is as its name implies the intake of the Colorado River <br />aqueduct system. The aqueduct system is made up of the main <br />aqueduct and the distribution facilities consisting of reservoirs, <br />pipe lines, and water softening plant. The main aqueduct termi- <br />nates 242 miles from Intake in Lake Mathews, which is the begin- <br />ning of distribution, Included in the main aqueduct are the five <br />pumping plants, the 230-kv transmission line bringing power from <br />Hoover Dam, the telephone lines, the reservoirs, tunnels, canals, <br />cut-and-cover conduits, inverted siphons, paved branch roads from <br />main highways to camps, and unpaved patrol roads, Construction <br />of the principal features of the mllin aqueduct was completed late <br />in 1939 and Colorado River water was first received at Lake <br />Mathews on November 2, 1939. <br />The original cost of the main aqueduct, the cost of additions and <br />betterments, and the net construction cost as of June 30, 1947 are <br />shown in table 2, These costs include preliminary organization alld <br />surveys, right of way and lands, construction utilities, Parker <br />Dam, and subsequent additi0ns and betterments charged to capita] <br />account. The net cost is after the deductions given in the table, <br /> <br />" <br /> <br />Tl"a,lIsmil:5sio/l- ii-ncs mul tde1Jho-ne system <br />There were no unscheduled interruptions of power due to causes <br />originating on the District system. Following the installation of <br />resistors in the 230-kv oil circuit breakers at Hoover Dam, the <br />breakers were tested 0n the District system and showed)mproved <br />performance in limiting the rise of voltage during switching opera- <br />tions, The District cooperated with the U, S. Bureau of Reclama- <br />tion in making short-circuit tests to determine the effectiveness of <br />the relaying plan now in operation on the District and Parker <br />transmission systems. <br />Interruptions and repairs of the telephone system for the year <br />were normal in number and extent. <br /> <br />[ 9 ] <br />