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, ~ "1' J..~'::' j 54 METROPOLITAN WATER DISTRICT I ;1 I l humps on the chart is a measure of the time taken for the water to travel a known distance. While the principle of the method is direct and simple, there is a great amount of work involved in its accurate application. The results of the tests were gratifying in that all of the pumps exceeded the guarantees by a considerable margin. The highest capacity was shown by the PUIllPS at Gene plant, wit.h an average per PUIllP of 216 cubic feet per second, or more than 93,000 gallons per minute. The pumps at Iron Mountain plant showed the highest efficiency, averaging 91.3 per cent. The average efficiency of all pumps in the five plants is nearly 90.5 per cent, which is an out- standing record in pump performance. The bonus rate for each per cent above the stipulated 88 was $10,000 at Intake and Gene, $5,000 at Iron Mountain, and $15,000 at Eagle Mountain and Hayfield, resulting in payments of $29,000, $29,000, $16,500, $24,000, and $28,500, respectively, a total of $127,- 000. Table 16 contains eugineering and cost data pertaining to each plant. The cost is shown as of June 30, 1940, with all work of construction and installation of equipment virtually completed. It does not include cost of housing, which is shown separately for each of the four camps, one camp at Gene serving two plants. J- \ POWER SUPPLY The principal power supply for the Colorado River aqueduct is obtained from Boulder dam under a contract with the United States dated April 26, 1930, and amendments thereto, by which 36 per cent of the firm energy and all of the secondary energy at Boulder dam is allotted to the District. This contract assures a supply of firm power sufficient to pump about 1,000 cubic feet per second, but when the water demand exceeds that amount Boulder power must be supplemented from other sources during periods when sufficient secondary energy is not available. J n this connection power from the Parker power plant among others will be utilized. The District's obligation to pay for its allotment of firm energy started at 55 per cent in July 1938, and will increase to 100 per cent of the allotment after July 1941. It is estimated that the de- mand for water will not reach 1,000 cubic feet per second until 1960, or later, and therefore during the next 15 or 20 years a co]]-