Gday Paul
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I think I saw a TV show on that one. It was for a remote restaurant with the hydro setup and a wind turbine competing to power the place?
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Nope, this was a simple unit by a bloke on a block near a hill with a stream.
It was a simple bucket drive that operated very similar to an overshot water wheel, but rather than being circular, it had about a 10m drop,
and the design used meant it was only about 1m wide vs 10m for a wheel, and very lightweight.
By having multiple buckets all full at the same time on the downward run, it gave constant torque, but without requiring a large flowrate.
The closest i can find so far is attached
( but it operates in reverse using air to lift the buckets. Never seen that before )
The main thing in these is they can extract nearly all the potential energy of the water without leaving much potential energy in the exhaust race.
Again, im not so sure how scalable it would be tho.
Andrew