Hydraulic ram pumps use the energy of flowing 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 volume to a height 10 times the inlet height and work where a water source flows constantly and has a minimum 3 foot fall to the pump. Their uses include lifting drinking water, pumping drinking water from streams, and lifting irrigation water. Advantages include being inexpensive, simple to construct and maintain, and operating without fuel or electricity using only water power.