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, 1".(' ,~. I,. o.J \; 128 METROPOLITAN WATER DISTRICT ~ Water is delivered under sufficient pressure to fill a receiving tank. l Each outlet is provided with strainer, water meter, by-pass, throt- It tlirig cock, and a pressure-reducing regulator if necessary. The Dis- J trict reserves the right to limit the delivery at anyone outlet to 50 gallons per minute and the operation of pumps to not more than 16 hours per day. Consequently, it is necessary for the user to install sufficient storage to carryover the eight-hour period during which the pumps normally are not operating. In addition to purely domestic needs in camps, and construction requirements in the mixing, placing, and curing of concrete, large quantities of water were used for incidental purposes. In the shops cooling water was necessary in air compression, in sharpening and t tempering of drill steel, and in the recharging of storage batteries. In tunnels, in order to prevent the formation of dust during drill- ing, water was supplied to the bottom of the hole through hollow "m '''''', ""d d,,,,", <h. m",k'", "",,,ti",, <h. ~k ""'k," b, I the explosives in blasting was frequently sprayed. Testing of the completed aqueduct sections, particularly the siphons, required t ~ large quantities of water. In the tunnels served by the system the total consumption for camps, shops, excavatiou, and concrete varied from 123 to 332 cubic feet per linear foot of completed tunnel and averaged 230. On the open work approximate quantities for similar uses were 100 cubic feet per linear foot for cut-and-cover conduit; 50 for canals; and 36 for siphons. All these quantities are exclusive of water used for testing. All water produced by the system has been used for aqueduct purposes with the exception of a small supply delivered to the California State Highway Department. Metered deliveries by calendar years are given in Table 10. De- liveries up to the end of 1934 were mainly for use in tunneling operations. In 1935 construction was extended to canal and con- duit schedules. During the years 1935 and 1936 work was actively in progress at almost all points from the Colorado River to the end of the system at Big Morongo. This activity continued into the early part of 1937 though many features were completed before the end of 1936. About 15 per cent of the water delivered in 1936-37 was for testing purposes. I The quantities listed in Table 10 are those metered for delivery ! 'I but not necessarily consumed at once. In periods of slack demand I water was stored in available completed portions of the aqueduct j