Hydraulics and Fluid Mechanics in ME
Coefficient of contraction is the ratio of

Loss of head in the orifice to the head of water available at the exit of the orifice
Loss of head in the orifice to the head of water available at the exit of the orifice
Actual velocity of jet at vena contracta to the theoretical velocity
Area of jet at vena-contracta to the area of orifice

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

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

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