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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Irrigation Company, Diversion Dam Fish Passage Structure, Palisade, Colorado, (Concept

Development Report) by FLO Engineering, Inc. was prepared for the previous work. Much of

the data in this memorandum for the fish screen designs is derived from the Concept

Development Report.

Basic Criteria

The primary design criteria includes screen location and orientation; approach velocity;

minimum screen area; sweeping velocity; flow distribution; mesh size, louver bar spacing, and

type of material; and cleaning features. Much of the design follows criteria and philosophies

used for the protection of juvenile salmon as specified by the National Marine Fisheries Service

(NMFS). The term "screen" in this memorandum is intended to include louvers, as well as,

wedge-wire screen mesh or perforated plate screens. Specific design criteria are as follows:

· Approach Velocity, perpendicular to screen = 0.5 fps.

· Sweeping Velocity, parallel to the screen face = 2.0 fps.

· Maximum screen design flow = 640 cfs.

· Minimum screen design flow = 580 cfs.

· Maximum opening size for screen mesh or perforated plate = 3/32 inch.

· Maximum opening size for louver bars = 1 inch.

· Life stage (size of fish).
In addition to the above specific criteria, WCAO-ND recommended consideration of the

following: Provide a sedimentation basin with an access ramp for sediment removal. Provide a

trashrack. Locate the screens near the existing headworks. Provide a gantry crane for screen

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