store the energy of water

increase the pressure of water

to lift water from deep wells

to lift small quantity of water to generate height when a large quantity of water is available at a smaller height.

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

Centrifugal pump

Reciprocating pump

Jet pump

Air lift pump

To store pressure energy which may be supplied to a machine later on

to increase the intensity of pressure of water by means of energy available from a large quantity of water at a low pressure

to lift larger load by the application of a comparatively much smaller force

all of the above