Hydraulics and Fluid Mechanics in ME
In a depressed nappe

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

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Hydraulics and Fluid Mechanics in ME
In a reaction turbine, the draft tube is used

To run the turbine full
To transport water to downstream
To prevent air to enter the turbine
To increase the head of water by an amount equal to the height of the runner outlet above the tail race

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