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, !CC c. "l:l" C'": V~. o California Sluice Gate No, 5 W.1B rehabilitated during the year. A bulkhead was installed in the gate opening, and the gate was sandblasted and repainted with VR6 vinyl resin. Rubber seals for the gate were replaced. Installation of electrical sensing devices and remote terminal units for computer control of the sluice gates Was completed. To date, software problems have prevented proper operation of the sluice gates by computer. 4. Overflow Weir Section Normal operations at Imperial Dam, when the lake is operating level, is to route surplus water through the Sluiceway gates instead of over the weir. In the event flood, conditions may be such that a major part of the would have to be passed over the weir. at normal California of a large floodwater Brush and weeds growing below the overflow weir were sprayed by maintenance crews in late 1981. A security survey recommended improving the intrusion alarm system for the weir area, and this is to be completed in 1982. Once each month, an inspection was made of the compartments of the overflow weir. Occasional minor leaks were noted in several flexible joints of the weir crest during the winter months. At present, the weir appears to be in good condition. 5. Gila Headworks The Gila Headgates are operated in full open position for normal operations and the flow to the Gila Gravity Main Canal is regulated by the diversion gates at the downstream end of the Gila Desilting Basin. Occasionally when a pin shears or a hoisting nut is stripped on a diversion gate, the gate falls to full open position; it may then be necessary to regulate the diversion to the Gila Gravity Main Canal by use of the headgates. The Gila Headgates are operated through their full operating cycle once each month as a check to make sure that the gates and equipment are in operating condition at all times. Normal maintenance practices such as checking and servicing the hoisting equipment, draining and refilling gear cases, servicing the transformers, cleaning the transformer vault, and other routine work were performed during the year. 6. Gila Desilting Basin The Gila Desilting Basin was in continuous operation during the year except during the period November 25 to December 3 when the Gila Gravity Main Canal was taken out of service for yearly maintenance. The basin was drained and the sediment deposited in the basin waB sluiced to the river on November 25. The avprage depth of sediment in 12