Hydraulic ram pumps use the energy of a large amount of water falling a small height to lift a small amount of that water to a much greater height, allowing water from springs or streams in valleys to be pumped to villages or irrigation schemes on hillsides. They can lift 1-20% of inlet water 10 times the intake height and work where water flows constantly and the usable fall is at least 91 cm. Their uses include lifting drinking water, pumping drinking water from streams, and lifting irrigation water. Advantages are low cost, simple construction, and not requiring fuel or electricity.