Hydraulic Ram pump

A hydraulic ram pump is a water pump powered by water. In areas where natural flows exist with a height difference of the water over a small distance, hydraulic ram pumps can be used to transport water to higher grounds without using electricity or fuel, by using the energy in the speed of the flow to pump a portion of the water up to a much higher level.

Principle of a Hydraulic Ram pump.

Children standing around a Hydraulic Ram pump produced by AIDF, Phillippines

Hydraulic Ram pumps

Advantages	Disadvantages
Uses renewable energy sources. If properly designed, can be locally produced and maintained Very effective in mounaneous areas	Water with height difference is needed

Movies

• Ram pump [1]

External links

• [explanation on wikipedia]
• [cost self made pump]
• [low tech pump design]