Laserfiche WebLink
<br />1- - <br />, <br />[' <br />~ <br />,. <br />, <br /> <br />~\ <br />~ <br />~b <br />(; <br /> <br />\ <br />iL <br /> <br />, <br /> <br />r - ". ~ <br />.,..... A") <br />OPERATION AND MAINTENANCE <br /> <br />19 <br /> <br />Canals, conduUs, siphons, tunnels, a-lId 1'cse?'voi-rs <br /> <br />Colorado River water was delivered throughout the year except <br />for two shutdown periods of three days each in December 1949 and <br />June 1950 to permit necessary maintenance work. A flow of 200 <br />cubic feet per second, the amount pumped by one of the three in- <br />stalled pumping units at each of the five pumping plants, was de- <br />livered during most of the year. A two-pump tlow of 400 cubic feet <br />per second was carried for a total of 57 days: 28 days in September <br />1949, se\'en days in October 1949, lllld 22 days in May 1950. For two <br />days in May 1950 a three-pump flow of 600 cubic feet per second <br />was carried to flush sand and debris from the canals and siphons <br />into the sand traps for removal. <br />A crew of nine men under the direction of a general foreman was <br />responsible.for the operation of canals, conduits, siphons, tunnels, <br />and reservoirs. Protection of the quality of the water was the pri- <br />mary concern of these forces, Reservoirs, canals, and pumping plant <br />forebays were periodically inspected, sampled and spot-treated with <br />copper sulfate when required for control of algae, Shorelines of <br />reservoirs \\'ere cleaned of tules.. br~lsh, and debris. <br />Other required maintenance work on the system included regular <br />patrolling and inspection. repairing of canal fences, maintenance of <br />canal dikes, diagonal drains, and patrol roads, the practically con- <br />tinuous removal of sand and debris from sand traps, and the ser- <br />vicing of automotive and maintenance equipment. The blowing of <br />sand and weeds against the canal fences and into the canals was <br />particularly severe this year because of even less than the normally <br />light rainfall in the desert areas. <br />A road was constructed from the outlet works of Copper Basin <br />reservoir aroulld the south shore lille to cOllnect with all old con- <br />struction road leading to the top of the dam. This road provides <br />access to coves and lagoons requiring maintenance work. <br />Several of the main aqueduct siphons again leaked water in the <br />two-month low temperature period of December 1949 and January <br />1950, but leakage waS much less than in past years. During January <br />eleven cracks ill Freda siphon leaked up to an estimated 32 gallons <br />pel' minute; the siphon at mile 18.30 leaked up to 4 g.p.m.; and tlow <br />from 20 leaks in Lakeview siphon totaled 16 g.p.m. Sawdust was <br />deposited in two of the siphons, 25 sacks in Freda and 50 sacks in <br />Lakeview, reducing the leakage. In April 1950 one of the larger <br />cracks in Freda siphon was repaired by means of a reinforced con- <br />crete collar placed around the siphon barrel over the crack, <br />