DUTY OF WATER. The duty of water is assumed at 2 acre-feet per year. The actual use of water will probably be somewhat less than this except in very dry years, due to the following causes: (1) The incentive to use water economically which results from requiring the user to pay at unit price only for the amount of water actually delivered to him. (2) The abundant rains that frequently occur during the growing season. The pumping installations and canals are designed on the basis of delivering irrigating water constantly when necessary at the rate of 1 cubic foot per acre for each 80 acres, which would provide each acre of irrigated land in the project with the required 2 acre-feet of water in eighty days' steady operation. The irrigation season is expected to extend from about May 15 to September 15. BUFORD-TRENTON PROJECT. The main intake pumping station (Pls. LXX and LXXI) for the Buford-Trenton project is located on the left bank of Missouri River about 2 miles below the mouth of Yellowstone River and 1 mile from Buford station, on the Great Northern Railway. This station consists of electrically operated centrifugal pumps installed on a scow that discharges the water into a settling basin on the adjacent low bench. The pumps will have a combined capacity of 150 cubic feet per second, with an average lift of about 28 feet. A second set of similar pumping units will be installed in a concrete building about 600 feet from the river (Pl. LXXII). They will take water from the settling basin and force it through about one-half mile of steel concrete pipe to the head of canal A, which will carry water to about 6,000 acres of cleared bench land. The total pumping lift from lowest river level is about 85 feet. The capacity of the pumps is 75 cubic feet per second. Canal B will carry water to about 5,000 acres of bench and bottom lands, and will take water directly from the settling basin. The total length of each main canal is about 8 miles. The motors in the two stations will be supplied with 3-phase current at 2,200 volts through three 300 kilowatt transformers installed in the permanent station. All the electric power for the Buford-Trenton project will be generated in the main power station of the Williston project. The transmission line will be about 25 miles in length, and electric power will be taken off the main line by branches extending to the intermediate stations described later. The transmission line voltage will be 22,000 volts. An additional floating pumping station will be located in the near future on the river side of the bottom lands of the Trenton flat. It will pump water for about 2,500 acres. The average pumping lift will be about 27 feet. On March 24, 1906, the Buford-Trenton Water Users' Association voted to enter into a contract with the Secretary of the Interior to return to the reclamation fund the cost of the completed works. The contract was executed on May 23, 1906. The expenditures on the Buford-Trenton project are summarized in the following tables: Expenditures, according to physical features, on Buford-Trenton project to June 30, 1906. Expenditures, according to purpose and nature, on Buford-Trenton project to June 30, 1906. The main intake pumping station of the Williston project (Pl. LXXIII) will be located on the left bank of Missouri River about 1,000 feet from Williston station on the Great Northern Railway. It will be a plant similar in size and design to the Buford intake station. The settling basin is located adjacent to the above pumping plant and a main canal extends thence northward about 3 miles up the valley of Little Muddy River. Beside supplying water directly to about 500 acres of cleared land, this canal will supply three additional pumping stations with the water which they will pump through pressure pipes to higher canal lines covering about 6,500 acres of cleared bench lands. One of these stations is at the end of the main canal and combined with it is the main power plant. About 1,500 feet east of it is the entry in the lignite vein from which the fuel will be mined. In this station will be the boiler plant and electric generating apparatus from which electric power will be transmitted to all the pumping stations of the Williston and Buford-Trenton projects. The initial installation of the steam generating plant will have about one-third the capacity of the completed plant. The 8 electrically operated pumping stations of the BufordTrenton and Williston projects will require a capacity of about 1,500 kilowatts in the main power station at Williston. Two pump |