The Columbia Basin Irrigation Project; A Report by Columbia Basin Survey Commission, State of Washington, 1920

The Columbia Basin Irrigation Project; A Report by Columbia Basin Survey Commission, State of Washington, 1920

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This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1920 edition. Excerpt: ...of the site for a concrete dam. Diversion Dam at Albany Falls. In locating the diversion dam, the most important consideration is that of providing an adequate waterway, so as not to restrict the stream channel to a greater extent than at present. The gates, as far as practicable, must be located so that openings will be in the direct line of flow of the stream. The river channel at Albany Falls is about 1,000 feet in width with banks of solid rock, and contains two islands of solid rock. From a construction point of view, this location is an excellent damsite. In providing sufficient waterway for flood periods the area of the cross-section of the stream was ascertained at the approximate location of the dam below an elevation of 2,060. This elevation is the height of water during the usual flood periods. This area is approximately 9,850 square feet. The normal minimum flow, which at all times will be passed over a weir, does not exceed 7,000 second-feet. During the maximum irrigation demand, the water surface at the intake must be maintained at not lower than 2,060. In designing the control works, three types were considered, namely, Stoney gates, roller dams, and Taintor gates. The Taintor gates were considered least practicable. Such a structure would have to be of unprecedented dimensions. Tentative calculations indicated that the roller type dam would require an excessive amount of steel and therefore would not be economical. In considering the Stoney gate, it was found that for a distance between piers of 50 feet and depth of water 20 to 25 feet, there are numerous examples of gates of larger dimensions, that have been constructed and are in use. This is particularly true in European designs, where for gates of these dimensions, the use of...show more

Product details

  • Paperback | 40 pages
  • 189 x 246 x 2mm | 91g
  • Rarebooksclub.com
  • Miami Fl, United States
  • English
  • black & white illustrations
  • 1236556755
  • 9781236556752