Hydraulics and Fluid Mechanics in ME
In a free nappe,

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

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Hydraulics and Fluid Mechanics in ME
The flow in a pipe or channel is said to be non-uniform when

The liquid particles at all sections have the same velocities
The quantity of liquid flowing per second is constant
Each liquid particle has a definite path
The liquid particles at different sections have different velocities

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