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

The available head of liquid is less than 5 times the height of orifice
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

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Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

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

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