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

The size of orifice is large
The available head of liquid is less than 5 times the height of orifice
The velocity of flow 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
The total energy of a liquid particle in motion is equal to

Pressure energy + kinetic energy + potential energy
Pressure energy - (kinetic energy + potential energy)
Kinetic energy - (pressure energy + potential energy)
Potential energy - (pressure energy + kinetic energy

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