9380

• UCREFRP Catalog Number: 9380
• Author: U.S. Bureau of Reclamation.
• Title: Grand Valley Irrigation Company Fish Screens ‎(Predesign)‎.
• USFW Year: 2000.
• USFW - Doc Type: Boise.
• Copyright Material: NO

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would be used as a trash rake is used as a mechanized brush cleaner. Either cleaning system can

be designed to operate by a water surface differential sensor at the screens, on a specified timed

cycle, or manually.

This screen arrangement has a horizontal length of screens of 230 feet. Using a sweeping

velocity on the face of the screens of 2.0 fps, the contact time of a fish traveling across the full

length of screens would be 115 seconds. Typical maximum contact time requirements used by

the PN Region for fishscreen designs for salmon is 60 seconds. If this criteria was used, the

screen arrangement shown on Figure 3 would require an intermediate bypass mid-way along the

screen face.

Estimated Cost

The estimated costs of fishscreens used for this memorandum will be based on typical costs of

past projects designed and constructed in the PN Region. These costs are summarized in the cost

curves shown in Appendix E. The Cost Curve for a Flat Plate Screen for a flow of 640 cfs shows

a unit cost of approximately $2,500.00/cfs in 1999 dollars. This estimate will assume a unit cost

of $3,000.00/cfs to allow for inflation and other factors. For a total design flow of 640 cfs, the

estimated project cost will be approximately $2,000,000.00.

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