Bypass fishway – Construction and operation
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Please see general information for all fishway types.
For most bypass fishways (excluding where concrete is used, e.g. cone fishway), the commissioning process may allow a tolerance greater than 5% because of the unpredictable or imprecise nature of rock placement and earthworks compared with concrete. However, basic measurements such as head loss, water depth and slope should meet design specifications within the agreed level of tolerance.
Bypass construction is a specialist operation involving skill and patience. A close relationship is required between design, construction and supervision personnel, and advice should be obtained from a rock ramp construction specialist to ensure that the requirements for configuration and integrity of the structure are met.
Operation and maintenance
Bypass fishways tend to require little human intervention to operate, however optimal hydraulic operation and regular maintenance is crucial for the long-term passage of fish through rock ramp fishways. Rocks that move during high flows can eventually cause the hydraulics to become suboptimal and lead to functional failure of the fishway. A regular inspection schedule will ensure the fishway functions effectively in the long-term, however it is often hard to determine when maintenance is needed, and this aspect requires training for local operators
Examples of inspection and maintenance tasks for a bypass fishway:
Last updated: 10 May 2021
This page should be cited as:
Department of Environment and Science, Queensland (2021) Bypass fishway – Construction and operation, WetlandInfo website, accessed 13 May 2021. Available at: https://wetlandinfo.des.qld.gov.au/wetlands/management/fish-passage/technologies/fishway-options/bypass/construction-operation.html