Using water wheel at pond to pump water from spring....

I have
Fantastic spring (80 litres/min,)
Pond that I can get 4' of head - so 4' water wheel - pond is spring fed and runs a 8" pipe continuous
(Yes I am blessed with lots of water)
house that is 50' above spring.

What I want to do is setup a water wheel that will run a pump underwater (-30 in the winter)

Feed will be a line from my spring and will pump to my 2000L cistern in the attic

Don't need to pump high pressure or high quantity as it will pump 24/7, "extra" water will just get dumped (remember lots of water and same aquifer)

Running 1" line from spring to Pump & 1"line to house

Envision water wheel with set of stepped pulleys to  90deg gearbox running a vertical shaft that will power the pump

Stepped pulleys so that I can play with the shaft speed easily

BTW Want min. of  20/litres hour that gives me 480 litres a day

I am not too concerned about the math as a 4' water wheel with the head & flow I have should run a pump that pumps .33/L a minute no problem.

What is the best pump to use in this situation?

I am thinking gear pump with sealed bearings?

Ideas?

Thanks, John

I am not familiar with gear pumps.

To me it sounds like you would use a Submersible Utility Pump.

My concern would be what size you would need to run a four foot water wheel?  1/2HP?

Maybe by bumping this thread someone smarter than me will throw out a suggestion.