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Slot fishways

New designs for vertical slot fishways N. RAJARATNAM Department of Civil Engineering, University of Alberta, Edmonton, Alta., Canada T6G 2G7. The vertical slot fishways built for locks 7, 8, 9 & 10 on the Murray River are. This paper presents the results of an experimental study on 18 designs of vertical slot fishways. Based on these results, it appears that a width of 8b0 and a length of 10b0 for the pools, where b0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance.

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Such fishways can be built with switchbacks to minimize the space needed for their construction. Based on these results, it appears that a width of 8 b 0 and a length of 10 b 0 for the pools, where b 0 is the slot width, are satisfactory, and minor variations can be made to these dimensions without affecting their satisfactory performance. At larger discharges, baffles induce lower local velocities and generate recirculation regions. This style is particularly favoured to aid flood defence. Fish Ladders On U.

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Innovations in vertical slot fishway design

A fish ladder , also known as a fishway , fish pass or fish steps , is a structure on or around artificial and natural barriers such as dams , locks and waterfalls to facilitate diadromous fishes' natural migration.

The velocity of water falling over the steps has to be great enough to attract the fish to the ladder, but it cannot be so great that it washes fish back downstream or exhausts them to the point of inability to continue their journey upriver. Written reports of rough fishways date to 17th-century France, where bundles of branches were used to create steps in steep channels to bypass obstructions.

A version was patented in by Richard McFarlan of Bathurst, New Brunswick , Canada, who designed a fishway to bypass a dam at his water-powered lumber mill. The ladder was removed in , when the City of Providence replaced the wood dam with a concrete one.

Concrete ladders are not always an improvement — the electric field-sensitive organs of the paddlefish are overloaded in the proximity of the rebar and other metal used in concrete construction, preventing them from gaining access to their spawning grounds and contributing to a catastrophic decline in their numbers. As the Industrial Age advanced, dams and other river obstructions became larger and more common, leading to the need for effective fish by-passes.

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A major factor in the construction cost is the gradient slope of the fishway channel, which determines the total length of the fishway. This project tested two methods of increasing slope and improving fish passage by reducing turbulence within the fishway pools.

The two methods used were:. The experiments yielded four major findings that have the potential to reduce cost and improve performance of fishways throughout the Basin:.

The results show that refining the vertical slot design can improve fish passage performance, but further research is needed before design changes can be applied with confidence to new fishways. Significantly, the design approach with the most potential to reduce cost is to separate the function of passing small fish and large fish, as well as allowing for differential passage in high and low flows as has already been applied with cost savings to the Lock 10 fishway.

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The passage of Carp gudgeons Hypseleotris spp. Restoring the ecological processes of dispersal and recolonisation, through effective fishways, will be an important part of recovering the populations of these species. Monitoring at the Sea to Hume fishways. How a vertical slot fishway works. Innovative Fishways — Manipulating turbulence in the vertical slot design to improve performance and reduce cost.

Unpublished final report to Murray-Darling Basin Commission. Barrett J, Mallen-Cooper M. Developing fishways for nonsalmonid fishes: Marine and Freshwater Research 59, — Fishway Consulting Services Report to the Murray Darling Basin Commission. Conceptual layout of a vertical slot fishway. Lock 3, Vertical Slot Fishway. Lock Vertical Slot Fishway. Michael Rodgers, Port Stephen. The following two tabs change content below.

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