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<br />I <br />,. <br /> <br />! <br /> <br />; "'}!'..'1 <br />~ "'-'f,li I N AQUEDUCT STORAGE <br /> <br />37 <br /> <br />drains occurred, but being subsequent to the flood peaks little ero- <br />sion of embankments took place. Restoration of drains and recon- <br />struction of embankment were accomplished by regular mainte- <br />nance crews and equipment. Patrol road repairs have been made <br />with bulldozer-equipped tractors and with graders. <br />Immediately following the Imperial Valley earthquake, which <br />occurred on May 18, 1940, an inspection was made of all aqueduct <br />structures. No evidence of any damage could be detected. <br /> <br />DAMS AND RESERVOIRS <br /> <br />P"rke1' D,,'In "uff Lake Ho.va.su <br />On June 30, 1938 construction of Parker dam was approaching <br />completion. The concrete plug had been placed in the inner diver- <br />sion tunnel and the bulkhead had just been seated at the upstream <br />end of the outer tunnel, diverting the river flow back into its old <br />channel. First water flowed through the spillway gates on July 1, <br />1938. <br />During July all concrete work was completed, inclnding the outer <br />tunnel plug, and all remaining metal was installed. In August, <br />work under the contract was finished and the contract was termi- <br />nated on the last day of the month. Some miscellaneous jobs were <br />done by forces of the Bureau of Reclamation, all work being com- <br />pleted in November. Stop logs were constructed and placed in <br />position on the trashrack structure, to permit un watering the fore- <br />bay while work is under way on the penstock tunnels for the power <br />development. Composition roofing was placed on the gate house <br />and the ornamental lighting units were installed along the roadway <br />on the dam. Filling of the reservoir began October 16, 1938, and <br />release <ir,,"atc-r iifBoulaer- dam for- this lllirpose elided 'at 1100n; <br />November 15th. 'On November 17th the water surface had reached <br />elevation 440.5. Through the cooperation of the operator of the <br />U. S. Geological Survey gaging station below the dam, tests were <br />run over a considerable time interval to determine the rate of <br />discharge under the various conditions of gate openings and with <br />changing head in the reservoir. <br />In October the District awarded a contract for drilling grout <br />holes in the California abutment, through which to form a grout <br />curtain below the top of the dam, by sealing any fissures which <br />might exist. Twenty-two holes were drilled and grouted under <br />high pressures. Nine refused grout altogether; one took 30 sacks <br />of cement; one took 29; one took 12; and the remainder from 1 to <br /> <br />\ <br />