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I I r I f ~ I . - r ) 4 \J ~,~ ~.. eNGINEERING ,1 Electrolysis surveys and cathodic protection No major electrolysis surveys of the District pipe lines were made during the year, The Southern California Gas Company installed a cathodic station at Olympic Boulevard and Evergreen Avenue to protect its 16-inch main in Olympic Boulevard. The location of the station is two blocks east of the District Palos Verdes feeder in Orme Street but lateral gas lines pass directly over the feeder, A test was made on May 23, 1946 to note any tendency of the District feeder to pick up current from the station, There \Vas no current flow in the District pipe either before or after the cathodic station was put in operation, indicating that the Type B enamel and gunite coating is still 100 per cent effective in keeping out all stray and galvanic currents. As a result of the test it was concluded that the District pipe would not be affected by operation of the proposed cathodic station on the gas' mains, and that drainage to the station would not be necessary, A.dditions to distrib"tio" s!I"tem plnnt The increasing service reqlliremenb~ necessitated design of sev- eral system extensions and additional operation features, Plans were prepared and equipment procured for two supplementary servic.e connections, one for the City of Long Beach delivering water into a new main constructed by the city southerly from 223rd Street near Delta A venue, the other for service to industrial facilities south of 190th Street in the City of Torrance. Plans prepared by the City of Pasadena Water Department were re- viewed for a connection to the District's upper feeder at Sierra Madrc_ Villa Ayenue.3j)l: future service.to an area ,in-tbe-easterly. part of the city. These three service connections, together with two others for which plans had been prepared previously, were installed during the year. Designs were prepared for a device to dissipate the energy in the discharge from the ] 6.inch sleeve type regulating valve in- stalled during August 1945 at the north portal of the Hollywood tunnel. The valve delivers flows up to 30 c.f,s. into a forebay at the grade tunnel entrance from a maximum upstream pressure of 70 pounds per square inch, and the resulting jet created a stand- . ing wave in the tunnel which interfered with the operation of the level control pilot valve. Following hydraulic tests on several models built to a linear scale of 1 :4, a full size assembly was fab- ricated and installed. The energy absorber discharges the flow