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<br />.- I::' I') <br />{' . v- <br />~ <br /> <br />METROPOLITAN WATER DISTRICT <br /> <br />patrol" roads, remove sand and debris from sand traps and sand <br />fences, repair leaks in concrete siphons and conduits, destroy weeds, <br />spot-treat water with copper sulfate, repair and maintain auto- <br />motive and maintenance equipment, and insure the delivery of clean <br />and wholesome water to the terminal reservoir at Lake Mathews <br />and to the San Diego aqueduct. <br />Protection of the quality of water continues to be the prime <br />concern of all main aqueduct forces_ Reservoirs were periodically <br />inspected, sampled, and spot-treated with copper sulfate when <br />necessary for control of algae. Shorelines of reservoirs were cleaned <br />of tules, brush and debris. Water standing in canals and pumping <br />plant forebays during periods when there was no flow through th.e <br />aqueduct was similarly inspected. sampled and treated as required. <br />The aqueduct carried water during all of the fiscal year except <br />for the four-month period August to November 1947 and a few <br />other short shutdown periods. A two-pump flow (approximately <br />400 cubic feet per second) was carried until July 26, at which time <br />the quantity was reduced to a one-pump flow (approximately 200 <br />cubic feet per second) until July 31, 1947, when all pumping was. <br />stopped. There was no delivery from August 1 to November 28, <br />1947, at which time a one-pump flow was started. This was con- <br />tinued until April 4, 1948, except for shutdowns of 2 days in <br />December 1947, 8 days in January 1948, and 2 days in March 1948_ <br />A two-pump delivery was carried from April 4 to June 11, 1948, at <br />which time the flow was reduced to one-pump, continuing for the <br />remainder of the fiscal year. <br />A considerable amount of sand was blown into the open canal <br />during the year. This material was effectively retained in the sand <br />traps which were cleaned out periodically by washing the sides <br />using a pressure pump and hose, scraping the bottoms. and remov- <br />ing the sand and debris from the traps with a truck crane and <br />clamshell bucket_ Box siphons were flushed clean by alternating <br />the flow between the three barrels. These operations insured satis- <br />factory water conditions in the aqueduct system throughout the <br />year. <br />The sand protection fence placed during September 1946. along i <br />1500 feet of the canal west of Iron Mountain on Schedule 9, has <br />proved quite effective in reducinR' the amount of wind-blown sand <br />entering the canal. Consequently, in January and February 1948, 11 <br />another section of sand fence, 5000 feet long, was erected on Sched- <br />ule 8. east of Iron Mountain, with similar effectiveness_ 1 <br /> <br /> <br />l <br /> <br /> <br />I <br />