Hydraulics and Fluid Mechanics in ME
In a free nappe,

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

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Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

semi-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of friction factor against Reynolds number
log-log plot of relative roughness against Reynolds number

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