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r ." :... ,~ 1 ~'''-L OPERATION A~D MAINTENANCE 17 ~ II , fi I. ~ , United States and the District. However. the annexation -of the San Diego County Water Authority to the Metropolitan Water District changed the point of diversion of the water to which San Diego is entitled from below to above Parker Dam and reduced the amount of energy available from Parker power plant. The District agreed that the entire amount of the reduction in energy should be taken from the District share of the power. leaving the Government share intact at its original value. Prior to the time the use and benefit of units 3 and 4 are taken over by the District the impairment of the energy output of the plant is being made good by replacement energy purchased from the Edison Company and delivered to the United States at Parker Dam. After December 13, 1952, when the use of the units will be transferred to the District, an amount of water equivalent to the San Diego diversion will be subtracted from the District share and added to the Government share of the power privilege. During the year 2.108,004 kilowatthours of replacement ener~' were delivered to the United States. The precise division of water for the generation of power for the District and the United States as provided in the outstanding contracts presents practical difficulties in the operation of the plant. A plan of minimizing these difficulties was discussed informally during the year. The capacity of the Government 230-kv tie line between the District and Parker systems was increased to 90,000- kva by the installation of the permanent transformer bank at Parker Dam_ Of the capacity of this tie line, 01' its equivalent, 50,OOO-kva will be necessary for the delivery of the power to the District system after December 13, 1952. At present the rental of units 3 and 4 to the United States, amounting to $950.00 pel' day. is being applied to the amortization of the District's share of the cost of the plant. When the use of units 3 and 4 is transferred to the District. the unamortized balance of such cost, amounting to some $3,300.000, will become due and payable by the District to the United States_ Canals. cand-I/-its, siphons, tunnels, reSel'VOi1'S Operation and maintenance work on the canals, conduits, siphons, tunnels, and reservoirs of the main aqueduct was carried on by a crew of 10 men under the direction of a general foreman responsible to the chief operation and maintenance engineer. The major work of this crew during the past year has been to patrol and inspect the system, repair canal fences, fill in voids behind the canal lining, maintain canal dikes and diagonal drains, grade and maintain