9593

• UCREFRP Catalog Number: 9593
• Author: Tetra Tech Inc.
• Title: Concept Development Report Hartland Diversion Dam Fish Passage Structure Delta, Colorado.
• USFW Year: 2000.
• USFW - Doc Type: Grand Junction, CO.
• Copyright Material: NO

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Irrigation Company on the Colorado River in Grand Junction, Colorado (USBR 2000) has
developed the UCRIP screening guidelines. The primary design criteria for the fish screens
include screen size, approach velocity, sweeping velocity, and design flows. Design guidelines
are summarized as follows:
1. Size of screen: 3/32 inch for perforated vertical plate, 1 inch for louvers.
2. Approach velocity, perpendicular to the screen: 0.5 fps.
3. Sweeping velocity, parallel to the screen: 2.0 fps.
4. Screen angle: angle screen to facilitate sweeping and minimizing approach
velocities.
5. Trash rack: install close to the screen to remove leaves, trash and twigs that enter
the ditch between the diversion and the screen.
6. Log boom: if significant debris is anticipated, install a log boom at the headgate on
the Gunnison River.
7. Bypass channel outfall: locate in an area that is relatively free from predation and
from eddies and reverse flow.
8. Bypass flow is approximately 3 to 10 % of screened flows.

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