Laserfiche WebLink
<br />~ <br />~~:~J <br />Tf:>,. <br /> <br />A~ <br />\~1~';") <br /> <br />l'- <br />c.- <br />~ <br />r: <br /> <br />C~ <br /> <br />the basin was approximately 0.1 feet with a volume of approximately <br />1,145 cubic yards, consisting mainly of fine materials. This is <br />considered a minor quantity and continues to give the indication that <br />most of the sediment that would normally enter the basin is being <br />deposited in the dredged area of the reservoir above the Gila Canal <br />Headgates. While the basin was dry, O&M personnel inspected the basin <br />floor, the floor drains, and the headgates. A crack in the embankment <br />along the west side of the desilting basin was noted during the outage <br />and this warrants careful observation in the future. <br /> <br />7. Gila Diversion Works <br /> <br />The Gila Diversion Works contain eight diversion gates which are used <br />to regulate flows to the Gila Gravity Main Canal and eight sluice <br />gates which are used to drain the Gila desilting basin and sluice <br />sediment deposits from the Gila desilting basin, <br /> <br />A continual problem with sheared pins, stripped hoisting nuts, and <br />broken stems on the diversion gates resulted in controlling flows to <br />the Gila Gravity Main Canal with the Gila Headgates. Some of the <br />repairs were delayed until the annual outage on the Gila Gravity Main <br />Canal. <br /> <br />The No. 6 diversion gate was rebuilt, sandblasted, and repainted. The <br />No.7 sluice gate was rebuilt, sandblasted, and repainted and gate <br />seals were replaced. <br /> <br />Installation of computer hardware to operate the diversion gates and <br />to indicate gate openings was completed in 1981. Computer software <br />problems have been found, and remedial action is underway. <br /> <br />8. Gila Sluiceway <br /> <br />The Gila Sluiceway Channel which was rea lined and improved in 1975 <br />continued to function satisfactorily during 1981. In order to prevent <br />water and sediment from backing into the Gila Sluiceway Channel during <br />sluicing operations in the California Sluiceway, a dike is constructed <br />at the lower end of the Gila Sluiceway to block the flow of water. <br />This dike has to be removed annually to allow for flushing operations <br />in the Gila Sluiceway. The dike was removed during the middle of <br />November and was replaced in December after the sluicing operations. <br /> <br />9. Hydrography <br /> <br />The USGS measures the flows at Station 60 and Station 1117 on the <br />All-American Canal once every week. Measurements of the flow at <br />Station 30, Gila Gravity Main Canal, are made twice a month by the <br />USGS hydrographers and more frequently when deemed necessary. Records <br />of the flow computed from water stage records and flow measurements <br /> <br />13 <br />