Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 7740
Type of Book: Technical
Section or Chapter Title: Design and operation of a cantilevered traveling fish screen (Model V)
Book Title: Preliminary designs of traveling screens to collect juvenile fish
Author: Daniel W. Bates, Ernest W. Murphey, Earl F. Prentice
Editor: Leslie W. Scattergood, Mary S. Fukuyama (Eds.)
Publication Year: 1970
Publisher: U.S. Fish and Wildlife Service, Special Scientific Report: Fisheries No. 608
Pages: 6-15

Model V was installed within the Stanfield Irrigation Canal near Echo, Oregon.  The Bureau of Commercial Fisheries developed the screen to meet the need for improved guiding of juvenile fish of all sizes and to reduce capital and operational costs.  Field tests with the model V screen showed a head loss of only 9.1 mm, with waterflow of 73 centimeters per second.  From 97 to 100 percent of the juvenile migrant coho salmon Oncorhynchus kisutch and steelhead trout Salmo gairdneri that entered the Stanfield Irrigation Canal were diverted into a bypass.

The self-cleaning screen, supported by a wire-rope suspension system, traverses the 8.5-m wide, 1.8-m deep, earth-lined section of the canal at a 20° angle to the waterflow.  Torsion induced in the structure by water forces on the screen is resisted by a main torque tube with track support arms placed at intervals along the tube.  The support arms are tied with wire rope to anchors on shore.  To minimize drag, the speed of the screen in the water can be matched to water velocity and the screen returned upstream above the water.  Screen panels are cantilevered from carriers on a continuous track.