The door should be opened wide. Submersible pumps submerge within the water and are secured within an air-tight chamber. A Water pump can be described as a machine that converts various energy sources into mechanical energy, which increases the mechanical energy of water and thus increases its flow rate. The water pump can be described as a form of a centrifugal pump operated by an engine and is linked to the crankshaft via a belt. In simple terms, the definition of a water pump is a gadget or machine that can be designed to move water under extreme pressure.