Hydraulic Power, 
Hydraulic power is the power delivered by the pump in the form of flow rate and head.
Hydraulic power is defined by
Where,
= density of the liquid
= acceleration due to gravity
= pump flow rate
= pump total head
Hydraulic power is usually expressed in kW and is usually placed in the numerator when used for calculating the pump efficiency. Hydraulic power is placed in the denominator when calculating for energy efficiency index (EEI).