In areas where natural flows exist, Hydraulic Ram pumps (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.
[[Image:PrincipleHydraulicRam.jpg|thumb|right|150px|Principle of a Hydraulic Ram pump. ]]
<b>Hydraulic Ram pumps</b>
[Image:PrincipleHydraulicRam.jpg|thumb|right|150px|Principle of a Hydraulic Ram pump. ]]