Water powered water pumps

[the-gnole]

http://journeytoforever.org/at_waterpump.html

Water-powered water pumps
Hydraulic ram water pumps use downhill water pressure to pump water much higher than it started, with no other power needed. A 20ft fall is enough to push water 150 feet above the source or more. Or as little as a 2ft fall between the water source and the pump at a flow rate of 1 to 3 gallons per minute is enough to pump water 20ft higher than the source -- as much as 4,000 gallons a day, depending on the model.

[Carrot Cruncher]

Thats definitely an interesting topic. "judy of the woods" has produced plans for building a homemade pump here http://www.judyofthewoods.net/diy/ram_pump.html

[clearthedecks]

Thanks for that CC - Good find. Didn't appreciate that you could work them down so small.
Sorely tempted to give one a go.