Billabong Hydraulic Ram

The Cheapest water you can pump - Water pumping water

Although most people are familiar with the water wheel, few have heard of the water ram, a comparatively small and ingenious pump, widely used in the 19th and early 20th centuries for lifting water to a tank or reservoir far above the water level from which the water originally came. The water ram used no fuel and was operated solely by the water itself.

Provided there is water that would otherwise be flowing to waste, the Billabong Hydraulic Ram can be used. The "Ram" will use the power of the flowing water to pump a little water to a higher height.