A study into the Environment Agency's regulations has been conducted by the EA themselves following pressure from the hydropower industry. This presentation by Olly Paish of the BHA gives some insight into the results.
In summary, the requirements for screen sizes for low head hydropower schemes will be for mesh size to be <=12.5mm, not <=2mm.
The EA have recently released details of various studies which in some cases relate to hydropower - see below from the EA, especially report no 3.
"The table below provides the titles and hyperlinks to the Evidence reports produced with our Evidence Directorate. Appendix 1 is a work in progress that is attempting to identify other projects (which we do not lead on) that may be of interest to the Hydropower sector."
Assessment of the impact of hydropower on weir pool features: report SC120077/R1
Assessment of the impact of hydropower on weir pool features: summary SC120077
Cumulative effects of hydropower schemes on fish migration and populations: report SC120078
Cumulative effects of hydropower schemes on fish migration and populations: summary SC120078/S
Testing the effectiveness of fish screens for hydropower intakes: report SC120079/R
Testing the effectiveness of fish screens for hydropower intakes: summary SC120079/S
Report: “The Effects of Run-of-River Hydroelectric Power Schemes on Fish Community Composition in Temperate Streams and Rivers” – G Bilotta
Project summary: Effects of run-of-river hydroelectric power schemes on fish.
Appendix 1- other evidence/monitoring projects that may relate to hydropower – but not led by Hydropower Sector
Ruswarp weir studies
Fish behaviour in relation to hydrodynamic signals
Fish behaviour in relation to acoustic signals
Field –based studies of fish and eel behaviour
Further field –based studies of eel behaviour (FCERM –funded)
Pumping stations and eel regulations – mitigation prioritisation project
Impact of Archimedes Screw HEP on salmon smolt
Hydrodynamically- and ecologically-driven design of weirs, hydropower plants and fish passes
Eel behavioural deterrents
Bubble screen deterrents for eels
Eel Regulation Guidance for EA pumping stations and IDB’s
Impacts of Archimedes Screw Turbines on salmon smolt migration
Stanley Mills Lamprey project
E-ON silver eels tracking study
Response of eels to velocity gradients
Habitat use by brown trout in relation to velocity gradients and turbulence
Impacts of acoustic stimuli on fish schooling behaviour
Impact of low-head hydropower development on fish survival and passage
Barotrauma in eels and influence of A. crassus.
Eel population dynamics and eel life cycle
Blade-strike models for eel and HEP turbines
Fish survival and damage tests with Lunagen turbines
Collate and describe what approach other European (and international) regulators are taking to protect glass eel and elvers
CEFAS work (Dart? Settle?)
Halton on Lune monitoring results
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