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0) :v - ...... , . Water is turned out from CAP system to agnculture district Havasu Pumping Plant, the project's largest, lifts the water from Lake Havasu to the Buckskin Moun- tains Tunnel inlet, 824 feet above the lake's surface, The water then flows 7 miles through the tunnel to the first section of canal. As the water flows through the system to its desti- nation, it is controlled by check structures, and car- ried under rivers and major washes by inverted siphons, or buried pipes, Turnouts deliver the water to user distribution systems, The Santa Rosa Canal, the largest distribution facility on the project, delivers water to one Indian reservation and two of the State's largest irrigation districts, It will also deliver water to additional users in the future, The first 17 miles of the Granite Reef Aqueduct, or Reach 1, playa specific role in the project's opera- tion, This oversized section of canal, between the Havasu and Bouse Hills pumping plants, acts as an in-line storage reservoir. Because the Havasu plant will use about one-half of all the energy needed for project pumping, it will be operated primarily when energy costs are lowest to reduce pumping costs, The water will then be pumped through the rest of the system as demand requires, Operators control and mOnitor system Operating and Controlling the System The CAP's operating features - the pumping plants, check structures, and turnouts - are oper- ated from the project operations and maintenance center in north Phoenix by a computerized control and communications system, Communications cables buried along the aque- duct carry operating commands from the control center's computer to check structures and turnouts, The commands raise or lower gates in these struc- tures so water can be moved through the system or delivered to users, A line-of-sight microwave system is used for oper- ating the pumping plants, Commands are sent from the control center over the microwave system to pump units at the plants, starting and stopping them as needed, The communications systems also carry informa- tion from the operating features back to operators at the control center, The operators, who plan system operations, also monitor the system's performance and adjust it as necessary, and correct problems that may occur, The microwave and cable systems can be used interchangeably to operate the project features, If this remote operations capability is tem- porarily lost, each individual operating feature can be operated manually,