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.'1.:' ~ ...... Wi, 36 ~1 E T R 0 POL I TAN \\' ATE R D 1ST R leT Riverside-San Diego county line, The aqueduct was in almo~t con- tinuous OIJeration at capacity or near-capacity flows during the fiscal year, averaging 99 cubic feet per second. An average crew of four men carried on all operation and main- tenance of the District portion of the s;'stem during the year. The major work con,<isted of patrolling the pipe lines and structures, operating valves, meters and equipment, making minor repairs, observing daily water deliveries, changing meter charts, collecting water samples, and cleaning and treating San Jacinto reservoir. On July 1, 1948, the outflow from San Jacinto reservoir to the San Diego aqueduct was cut off and the interior of several portions of the pipe line between the reservoir and the Fallbrook-Oceanside lateral was inspected to determine the cause of a r€duction of about 8 per cent in the carrying capacity of the line noted the preceding month, Inspection revealed a bacterial growth on the interior sur- face of the pipe which apparently had increased the friction and reduced the flow. Chlorination of the water was started on July 7 and at the end of the month the capacity of the line appeared to be normal. Using temporary means, chlorination was continued while maintenance forces constructed a permanent chlorination station. The new ~tructure was placed in service on October 16, 1948. and chlorination was continuous throughout the remainder of the year. Late in June 1949 the chlorine dosage was increased in order to extend the apparently heneficial effects of the chlorine in controlling bacterial growth farther south and well into the Author- ity pipe lines, Additional rate of flow measurements were conducted on the San Diego aqueduct during March and April 1949, On March 22 measurements were made by District forces using, the color-velocity method. From wfarch 30 to Arril 7 more extensive measurements were made on a 7,:\80-foot section of 72-inch diameter concrete pipe about 8 miles downstream from San Jacinto re!'ervoir. This work was under the supervision of Mr. Fred C. Scobey, senior irrigat.ion engineer for the Soil Consenation Service, U. S, Department of Agriculture, assisted by Distdct forces and an engineer of the U. S. Bureau of Reclamation. Numerolls determinations were made using the color-velocity and salt-velocity methods on flows varying from 20 to 103 cubic feet per second, Fill material was hauled to several locations along the aqueduct where the initial backfill had "ettled around structures and over the pipe line. A 6-inch diameter, 12-foot high vent pipe was in-