Northwest Fisheries Science Center

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Document Type: Chapter or Section
Center: NWFSC
Document ID: 7733
Type of Book: Technical
Section or Chapter Title: A preliminary study on the maintenance of an inclined screen. Report No. 20
Book Title: Fish-Passage Research Program review of progress 1964, Volume III
Author: Daniel W. Bates
Editor: Gerald B. Collins, Carl H. Elling (Eds.)
Publication Year: 1964
Publisher: Report of the Accelerated Fish-Passage Research Program to the U.S. Bureau of Commercial Fisheries. Seattle, Washington

Inclined screens fabricated of perforated plate or wire cloth screen have had widespread application in collecting juvenile migrants out of canals, small rivers, and streams.  One of the most recent is now in use by the Bureau of Commercial Fisheries in a test facility on the Grande Ronde River near Troy, Oregon.

Notwithstanding the popularity of the inclined screen, little information was available as to how well suited such a facility might be for use as a fish screening device within a major river.  There was considerable question as to just how the entire flow of a river could be passed through a screen without completely clogging the openings, or without developing a severe maintenance problem.

The purpose of this initial investigation was to explore the methods for cleaning debris from the screens in the search for the most efficient.  Studies on the effect of factors such as approach velocity, static head, screen angle, type and volume of debris and design of the plate screen screen efficiency are still in progress and will be reported later.