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<br />, <br /> <br />, ~; ') <br />...~ .J..W- <br /> <br />OPERATION AND MAINTEN ANCE <br /> <br />19 <br /> <br />Tests were made to determine the extent of vibration that has <br />caused cracks in yanes of the turbine runners of the original design. <br />As a result of these tests critical vibration has been reduced by <br />modification of the vane contours. Such modification has been ac- <br />complished with the runners in place. Further progress of the <br />cracking has appeared to cease. Plans ha\'e been made to repair <br />existing crach in the runners prior to the time the District takes <br />over these units. <br /> <br />A spare turbine runner for Parker power plant was delivered in <br />October 1950. Plans to install this runner haye been abandoned <br />since cracking in the original rnnner has been arreHted. <br /> <br />The output of the Parker power plant was the lowest on record. <br />284,464,000 kwhI' below last year. This was the result of a dry year <br />on the Colorado River watershed, coupled with the use of a portion <br />of the releases from Lake Mead to fill Lake Mohave behind Davis <br />Dam, about half way between Hoover and Parker dams, and the <br />operation of the plant at a low head for a month. The following <br />table shows the gross and net generation, the replacement energ,I' <br />furnished by the District for water diverted above the dam for use <br />by San Diego, and the total energy delivered to the transmission <br />system. <br /> <br />KWIIU <br /> <br />(;ro"'~ l"ner/lY gt'nf'r:Jll"d III Parkn Dam. <br />Fner~y for ~Iatipn 1I,,(~ <br /> <br />...... .s:l~.]19.0(lO <br />Ll24.2A2 <br /> <br />Net energy gcneral..d <br />Rt'Jllll'~cment erwrgr, San Dicj!o di\,t'r<;inn.. <br /> <br />. ....S.13.l94,71fl <br />4..-1-I~.O]f1 <br /> <br />Total energy fur deli\'ery 10 trall!;;missioll ~y"It'Il1. ..............537,006.721:1 <br /> <br />The power plant at Davis Dam was placed in operation during <br />the year and the Parker-Davis transmission system was expanded. <br /> <br />Canals. crr!l(!lI-its, siphons, tunnels, Wid -reser-uoh's <br /> <br />The main aqueduct carried Colorado River water continuously <br />throughout the year except for short shutdown periods of three <br />days each in December 1950 and February 1951 and one of two days <br />duration in May 1951. A flow of 200 cubic feet per second, the <br />amount pumped b"' one of the three installed pumping units at each <br />of the five pumping plant<, was delivered during most uf the year. <br />A two-pump flow of 400 cubic feet per second was carried a total <br />