Hydro power from small river?

[Spectric]

but a lovely new example of an archimedes screw system built by hydropol.cz

Another example can be seen at Cragside in Northumberland. This was the first house in the world to be lit by hydro electric power but not by the current method.

 

[joncooper27]

I have seen a few screw ones that are large scale I’m looking for something smaller scale of say 1KW