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 measured above the horizontal datum
Total energy per unit discharge
Total energy measured with respect to the datum passing through the bottom of the channel

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Hydraulics and Fluid Mechanics in ME
Cavitation will begin when

the pressure at any location reaches an absolute pressure equal to the saturated vapour pressure of the liquid
flow is increased
pressure is increased
pressure becomes more than critical pressure

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