Hydraulics and Fluid Mechanics in ME
In a free nappe,

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

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Hydraulics and Fluid Mechanics in ME
An orifice is said to be large, if

The velocity of flow is large
The size of orifice is large
The available head of liquid is more than 5 times the height of orifice
The available head of liquid is less than 5 times the height of orifice

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