Hydraulics and Fluid Mechanics in ME
Overall efficiency of a centrifugal pump is the ratio of

Actual work-done by the pump to the energy supplied to the pump by the prime mover
Energy supplied to the pump to the energy available at the impeller
Manometric head to the energy supplied by the impeller per kN of water
Energy available at the impeller to the energy supplied to the pump by the prime mover

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Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Total energy per unit discharge
Kinetic energy plotted above the free surface of water
Total energy measured above the horizontal datum
Total energy measured with respect to the datum passing through the bottom of the channel

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