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

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
The size of orifice is large
The velocity of flow is large

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Hydraulics and Fluid Mechanics in ME
Mach number is significant in

all of fhe above
simultaneous motion through two fluids where there is a surface of dis-continuity, gravity force, and wave making effects, as with ship’s hulls
supersonics, as with projectiles and jet propulsion
full immersion or completely enclosed flow, as with pipes, aircraft wings, nozzles etc

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