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

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

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

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