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<br />'t0~i <br /> <br />28 <br /> <br />\1 E THO r 0 LIT AN \\' ATE R D 1ST R I C T <br /> <br />manufacturer to the interior of the pump casings was badly <br />deteriorated and in many places entirely gone. Some pitting and <br />cavitation on the casings was noted. Repainting was deferred <br />until such time as repairs to the pitted areas may prove necessary. <br />On one casing at Eagle Mountain, several kinds of protective <br />paint and enamel were applied and left for future inspection to <br />assist in determining the best material to apply when coating <br />becomes necessary. The cooling water boxes in the Intake and <br />Gene motors were badly rusted and pitted. They were thoroughly <br />cleaned and reenameled. The enamel on the pump inlet pipes at <br />all plants was found broken in small areas and was repaired. <br />Some difficulties have developed in the operating mechanism of <br />the pump discharge valves at Intake, Gene, and Iron Mountain <br />plants. Inspection and tests have shown that considerable undue <br />wear has taken place in the mechanism. Arrangements have been <br />made with the manufacturer for remedying the defects, and the <br />affected valve parts will be returned, one valve at a time, to the <br />manufacturer for repair. The manufacturer has agreed to bear <br />part of the costs. Other maintenance of minor and routine char- <br />acter was carried on throughout the year. <br />It was discovered in May 1940 that damage had occurred to <br />one of the main transformers on the 230-kv line at Hayfield. <br />Following this discovery all main transformers were inspected <br />and, with the cooperation of the manufacturers, changes were <br />made in the transformer cores to prevent similar trouble at other <br />plants. The defective transformer at Hayfield was repaired at the <br />expense of the manufacturer and put back in service in October <br />1941. No further transformer trouble has developed. <br />The water surface in Lake Havasu fluctuated from about eleva- <br />tion 438 to elevation 442 until the middle of May 1942 when, in <br />order to study the effect on silt deposits in the river upstream from <br />the lake, the U. S. Bureau of Reclamation with the consent of the <br />District lowered the lake level below the minimum elevation of <br />435 at which the Intake pumps can be operated. The lake remained <br />at levels between 412 and 422 during the remainder of the fiscal <br />year. Prior to lowering the water surface in the lake, Gene and <br />Copper Basin reservoirs were completely filled in order to store a <br />supply of water for the use of the U. S. Army training centers <br />and District camps. <br />Transmission of power to the Phoenix area in Arizona waS <br />resumed on July 6, 1941 after having been temporarily discon- <br />