Dear Mr Thomas K�hli I read with interest the infomation about your micro hydro plant in Switzerland using an archimedes screw. I have never heard of this being used before, and am curious as to why it was chosen. Efficiency at low head? Fish protection? Cost? Do you have any more details of the project available? I am looking at ways to install a low head scheme (1.8m) in a river where fish protection is a major problem. What I really need is a machine that will extract the water power efficiently, whilst still permitting the safe passage of small fish through the unit!
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