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r..... !~,- ;G .L .:.. ,.l :W .\1 E 'I' R 0 P () L I '1'\ N IV.\ T E H III ST Hie T reduction of regular patrol during the period when the grounding system was being installed on the 2:30-kv trllll,mission lines. Parker Dam aud jJo-a/Dr plant The United States Bureau of Reclamation operated Lake Havasu with water surface at elevation 420 feet or less until September J9, 1942, when, at the request of the District, the refilling of the reservoir was commenced. Pumping from the reservoir into the aqueduct was begun October 7, 1942, at which time the water level had risen approximately to elevation 4:30, The water surface was gradually increa,;ed to elevation 450 feet, or full reservoir, by March 194:\. and remained close to this level during the remainder of the fiscal year, The construction of the puwer plallt at Parker Dam alld installa- tion of equipment were completed by the Bureau of Reclamation, The Parker power plant is located on the California side of the river immediately below the dam, and contains four vertical hy- draulic turbine generator units capable uf operating under a gross head varying from 64 to 87 feet. Water is diverted from Lake Havasu through a trash rack ~tructllre into a forebay excavated in the rock of the river "ank, From the fore"ay, steel-lined penstock tunnels, 22 feet in diameter, excavated through rock admit water to the plate-steel sCI'oll cases of the hydraulic turbines, A steel slide gate, 22 feet b)' :\5 feet, operated by a gantry crane, is in- stalled at the upper end of each penstock, The hydraulic turbines are of the vertical-shaft, single-runner, Francis type, and were manufactured by the S. Morgan Smith Company, Each has a rated output of 40,000 horsepower at a head of 80 feet and operate,; at a speed of 94,7 revolutions per minute, Best turbine eflicienc)' was specified at 36,000 horsepower at a head of 80 feet. Each unit is equipped with a Woodward oil-pressure governor with individual oil-pressure pumps in duplicate, and a single pre.s~ure tank. The direct coupled g'enerators were manufactured by the West- inghouse Electric and Manufacturing Compan)' and are rated at :30,000 kva. 6~OO volts. 3 phase, 60 cye1e, unity power factor, The)' are totaHy ,,"closed for recirculation of air and are water cooled, Each generator is provided with direct connected main and pilot exciter;-;; the thrust bearillg~ are of the J{ing~bury type, manufac- tured by the We'tinghou,;e Com pan)', The main transformers are located on a platform 011 the river ~ide of the power plant. Each generator b; operated ax a unit with . ) J ,