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

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Hydraulics and Fluid Mechanics in ME
In open channels, the specific energy is the

Total energy measured above the horizontal datum
Total energy measured with respect to the datum passing through the bottom of the channel
Kinetic energy plotted above the free surface of water
Total energy per unit discharge

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