Denil fishway

Denil fishway – Planning and design

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• Overview
• Key considerations
• Planning and design
• Construction and operation
• Links and references

In addition to the general information for all fishway types, the following applies to Denil fishways.

Slope

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.[2]

Monitoring

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[1].

References

1. ^ Jones, M, O'Connor, JP & Arthur Rylah Institute for Environmental Research (2017), Monitoring the performance of fishways and fish passage works. [online] Available at: https://nla.gov.au/nla.obj-664272102 [Accessed 1 March 2021].
2. ^ O'Connor, J, Stuart, I, Jones, M & Arthur Rylah Institute for Environmental Research (2017), Guidelines for the design, approval and construction of fishways. [online] Available at: http://nla.gov.au/nla.obj-664261559 [Accessed 25 February 2021].

Last updated: 10 May 2021