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I I I I I I I I, I I I I I I I I I I I 002..-'-...... . . ~~o from 1941 through 1972 through the All-American Canal. The original powerplant was shut down in 1972, and a new powerplant was constructed and placed in operation in 1987. It currently operates to develop power from Yuma Project deliveries and deliveries made to Mexico. If Mexico's order at the NIB, less drainage return flows and sediment control flows below Imperial Dam, is ~ than 800 cfs, the water is normally routed through the Siphon Drop Powerplant to generate power. Siphon Drop Powerplant requires a minimum flow of 350 cfs to operate and, to the extent possible, this flow is maintained through delivery requirements to Mexico and water ordered for the Valley Division of the Yuma Project. The Yuma Main Canal wasteway, more commonly referred to as the California wasteway, was constructed in 1912 at the same time the Colorado River Siphon was constructed under the Colorado River at Yuma, Arizona, to deliver water to the Yuma Valley Division in Arizona. It was constructed to protect the Yuma Main Canal if excess flows are diverted into the canal or sudden cutbacks in water use in the Yuma Valley occur. The wasteway allows those excess flows to be diverted back into the Colorado River. Later, after the All-American Canal was constructed, a portion of the water delivery to Mexico was routed down the All-American Canal through Siphon Drop Powerplant and the Yuma Main Canal wasteway. The Gila Gravity Main Canal - Construction of the Gila Gravity Main Canal occurred between 1936 to 1939. The canal is 20.5 miles in length with two tunnels and has a capacity of 2,200 cfs. It serves approximately 100,000 acres of farmland located in the WMIDD, the North Gila and South Gila Valleys, the Yuma Mesa Irrigation and Drainage District, and the Unit "B" Auxiliary Project. The headworks for the Gila Gravity Main Canal are located at Imperial Dam. Since the Gila Project was originally authorized to irrigate 585,000 acres, three diversion outlets were originally provided at Imperial Dam. The acreage to be served by the project was reduced in 1947, so only one outlet and one desilting basin were put into operation. The water delivery from the Gila Gravity Main Canal to the North Gila Canal started in 1943. Water was first diverted from the Gila Gravity Main Canal to the Wellton-Mohawk Division in 1952, and the last of the Wellton-Mohawk Project was completed in 1957. Water diversions to Yuma Mesa started in 1952 and water diversions to the South Gila Valley began around 1965. Appendix D - 7