Fishtek are the leading consultancy in the UK in assessing the interaction between hydropower and fisheries. We have conducted extensive monitoring of low head hydro power turbines (the Archimedean Screw), involving live fish trials, fish behaviour at the intake, outflow and within the turbine chamber, and risk assessments of the probability of fish being damage during passage through hydroturbines.
Our work has been used to inform current national guidelines on hydropower and fisheries, including the current version of the Environment Agency's "Good Practice Guidelines on Hydropower" and was pivotal in demonstrating that Archimedean screws are 'fish-friendly'. Many of our assessment methodologies have become the industry standard for investigating the potential impact of a proposed hydropower scheme on the fisheries ecology of a river.
Our assessments of the impact of Archimedean screw leading edges on fish resulted in the development of fish friendly compressible bumpers to mitigate the effects of higher impact speeds on the largest screw turbines now in use. These bumpers are now required as standard on larger Archimedean screws.
For more information on Compressible bumpers, contact Fishtek
Archimedes risk assessment
Archimedean Screw risk assessment: strike and delay probabilities.
Date: September 2011DOWNLOAD
Howsham fish monitoring
Assessment of fish passage through the Archimedes Turbine and associated by-wash.
Date: August 2009DOWNLOAD