ML19319C191

Diversion & Collection of Juvenile Fish W/Traveling Screens

ML19319C191
Person / Time
Site:	Davis Besse
Issue date:	03/31/1970
From:	Bates D INTERIOR, DEPT. OF, FISH & WILDLIFE SERVICE
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ML19319C189	List: ML19319C188 ML19319C190 ML19319C191
References
633, NUDOCS 8001310601
Download: ML19319C191 (8)

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U.\\ 753 STATES DEPARTMENT OF THE INTER! '?

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U.S. FISH AND WILDLIFE SERVICE SUREAU OF COMMERCIAL FISHERIES l

Fishery Leaflet 633 l

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8 UNITED STATES DEPARTMENT OF THE INTERIOR f

Walter J. Hickel, Secretary i-Leslie L. Glasgow, Assistant Secretary for Fish and Wildlife, Parlcs, and Marine Resources Charles H. Meacham, Commireioner, U.S. FISH AND WILDLIFE SERVICE Philip M. Roedel, Director, BensAU OF COMMERCIAL Fisuzarza

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Diversion and Collection of Juvenile Fish with Traveling Screens i

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l DANIEL W. BATES i

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l' Fishery Leaflet 633 1

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, Washington, D.C.

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Diversion and Collection of Jasnila Fish with Traveling Screens By DANIEL W. BATES, Fishery Biologist Bureau of Commercial Fisheries Biological Laboratory Seattle, Wash. 98102 l

ABSTRACT A horizontal traveling screen, suitable for screening fish or debris from powerplant water intakes or irrigation diversions, was designed and operated by the Bureau of Com-i mercial Fisheries during 196.5-69. The structure consisted of a vertically hung, endless j

belt of wire-cloth screen panels, flush with the face of the water intake structure or at sn angle to the direction of flow.

Field tests in different water approach velocities, with the screen traveling at var.

ious rates, proved that such a facility can be operated elliciently. The horizontal travel-ing screen, as described here, should contribute materially to the development of an effi-cient, relatively low-cost diversion facility for fish and debris.

BACKGROUND ON PROBLEMS IN SCREENING FISH For many years biologists and engineers ing or collecting fry and eggs of striped bass, have been trying to develop an eflicient method shad, and smelt, (6) need for frequent adjust-to safeguard juvenile fish exposed to hydro-ments to compensate for changes in flow vol-electric or irrigation developments in rivers, ume, (7) and excessive maintenance.

They studied the possibility of deflecting mi-In 1965 a new approach was conceived grants from their normal paths, causing them which promises to overcome these disadvan-to take alternate routes. Numerous methods tages. Development of the horizontal traveling of deflecting fish have been examined, such screen (fig. 2) provided many practical solu-l as bands of rising bubbles, curtains of hanging tions to problems of fish diversion. Among

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chains, electrical stimuli, lights, louvers, sound, its advantages are the following:

and water jets (fig.1). These methods func.

1. Reduction of cost appears probable, i

tioned satisfactorily under certain conditions, due to simplicity of design.

but were never completely reliable.

2. Maintenance costs are low because all l

Notwithstanding the extensive and imagi- ~

major operating parts are out of the water.

l nativo research, all fish-guiding or deflection

3. Previous probiems of impingement of devices in use today are burdened with one fish on screens are far less serious. Formerly

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or more of the following disadvantages: (1) many fish carried onto vertically traveling

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high cost, (2) insufficient guiding efficiency, screens (such as the drum screen, flg. 8) were (3) mechanical limitations where water depth either carried over the screen and lost or is great or volume of flow large, (4) excessive sustained injuries in their efforts to free them-head loss, (5) limited capacity for safely guid-selves. This latter problem also applies to l

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i Figure 2.-Artist's view from upstnam of traveling screen (model 1),17 feet leeg and 4 feet high. This scrose..r- ---- the arit of sis e.-

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Figure 3. View from upstream of series of rotary drum screens placed 90' t t

during 1967 in the 500 second-foot Stanfield t

Conversely, if the industrial water screen.

Irrigation Canal, a divers:en of the Umatilla fish are carried onto the horizontal traveling River, Oreg. When model V (fig.4) was tested screen their impingement is gentle since travelw th a natural run of juvenile steelhead trout of the screen can be matched to the velocity and coho salmon, efficiencies ranged between of the water; the fish remain in the water as Because of 97 and 100 percent. Even greater efficiency they are carried into the bypass.

the gentle impingement, higher approach ve-can be expected from the newer designs.

8. Efficiency of operation remains high locities and reduced canal widths can be con-irrespective of fluctuations in water surface -

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4. Nonswimming forms, such as eggs of elevation.

[y striped bass and shad, can be collected on the

9. As a safety measure, a pressure-re-screen and safely carried for release into the lease mechanism allows the panels to swing d

open if the water pressure becomes excessive.

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bypass.

5. To provide for inspection or mainte-

10. The total velocity of bypass flow is nance, the interlocking screen panels can be minimal compared to total canal flow since e!(

i readily lifted out and returned to their ori-fewer bypasses are required for the traveling II (J

screen. With other systems the number of by-ll [

ginal positions.

6. Screens can be easily changed if a passes must be considerably greater to avoid Q

dr. ent mesh size is required.

the possibility of fish becoming tired and im-7.111gh efficiency in fish deflection can pinging on the screens.

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be anticipated on the basis of successful tests

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e Figure 4.-Sectional view of model V, installed and tested during 1967 in the Stanaeld Inigation Canal, a divenion of the Umatilla River near Echo, Oreg.

CONTINUING IMPROVEMENTS IN DESIGN Since its conception, the plan has under-being operated in the Bureau of Commercial gone extensive development. The latest proto-Fisheries' test fiume on the Grande Ronde i

type (model VI, 85 feet long) screens over River near Troy, Oreg. A bypass installed 1,000 second-feet of water at a 6-foot depth at the downstream end of the traveling screen at velocities up to 3 feet per second. It is now serves as an exit for fish deflected by the screen.

71 FUTURE APPL.lCATION Wherever a problem of fish screer.ing exists, The Bureau of Reclamation regards this new the horizontal traveling screen could be the concept as the most promising development

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answer. The State of California. collaborating to date in high-efficiency fish screening.

with the U.S. Bureau of Reclamation, is study-An ideal application of the horizontal trav-Ing its application in the Central Valley of eling screen would be its placement in front California to divert fish eggs and juvenile fish.

l The State estimates annual diversion at over f a powerplant intake. The figure on the 250 million small striped bass, one-eighth to cover.'lustrates one possible method of instal-several inches long. This project would re.

latfor.. This layout allows river flows to cir-quire the screening of about 30,000 second-feet culate freely past the screen face and eliminates t

of water (13.5 millien gallons per minute).

the need for a bypass.

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PROPOSAL TO INDUSTRY The Bureau of Commercial Fisheries is now The Bureau of Reclamation is planning a study proposing the design of a larger and improved of the traveling screen at its Denver hydraulic model (fig. 5) for the 2,500 second-foot Leeburg laboratory. A test stand will be constructed, powerplant intake canal at Eugene, Oreg.

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scow i*. to' nov isee Figure 5.-Artist's concept of model VII, as it might appear within a canal or river.

The canal is 17 feet deep and 70 feet wide; complete end-turn, and two panels with car-maximum water velocity is 3.6 feet per second ringes. This stand will serve as a check of (fig. 6). The City of Eugene (through its operation and fabrication problems.

powerplant division, the Eugene Water and Although the Bureau of Commercial Fish-Electric Board) has approved use of the canal eries has independently developed the design f horizontal traveling screens since 1965, a for installation of a traveling screen and has c perative effort by the government and pri-provided $7,500 to cover preliminary engineer-vate mdustry is an appropriate means of pur-ing design costs.

suing final design, construction, and testing Thus far, each model has been somewhat of a prototype (model VII) structure. Suf-larger than the previous one, and each design ficient adaptability to meet a wide variety of has been considerably modified and improved.

screening requirements is anticipated.

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