Hydraulics and Fluid Mechanics in ME
In a free nappe,

The pressure above the nappe is negative
The pressure below the nappe is atmospheric
The pressure above the nappe is atmospheric
The pressure below the nappe is negative

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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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