Denil fishway – Planning and design
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In addition to the general information for all fishway types, the following applies to Denil fishways.
Denil fishways have been built on relatively steep slopes (e.g. 1:12 to 1:8 vertical:horizontal) compared to other common fishways in Australia.
Water velocity and turbulence
Denil fishways have been used as the primary fishway overseas, but the velocity and discharge tend to be relatively high (e.g. 1.8 m/s). Denil fishways therefore target large fish that are capable of negotiating relatively fast water velocities over steep slopes with high turbulence.
Funnels and screens may be used for sampling fish on Denil fishways, where a pool is used as the holding area for the fish. Unlike fishway traps where the trap can be lifted out to access the fish, flows through the fishway may need to be stopped to enable the fish to be collected by electrofishing or dip-netting.
Disclaimer: In addition to the standard disclaimer located at the bottom of the page, please note the Fishways (biopassage structures) disclaimer.
Last updated: 10 May 2021
This page should be cited as:
Department of Environment, Science and Innovation, Queensland (2021) Denil fishway – Planning and design, WetlandInfo website, accessed 1 February 2024. Available at: https://wetlandinfo.des.qld.gov.au/wetlands/management/fish-passage/technologies/fishway-options/denil/planning-design.html