Roger Hayter wrote:
Title says it all. I am looking for a submersible water pump, a few
litres an hour would do, driven by propeller/turbine working off the
flow in the stream to pump water up a few feet. Or of course any
relevant components of this idea would be useful. Many thanks for your
thoughts. Water wheel, unless on a raft, is no use as water lever varies
about 5000% of minimum 100mm or so.

Hydraulic ram?

Used in TPLACs for water supply.

Owain