Civil Engineering Questions
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Ali Hamza
Ali Hamza
03 Feb 2019

What is Orifice??


An orifice is an opening, usually circular, in the side or base of a tank or reservoir,

through which fluid is discharged in the form of a jet, usually into the atmosphere.

The volume rate of flow discharged through an orifice will depend upon

the head of the fluid above the level of the orifice and it can, therefore, be

used as a means of flow measurement.

• Discharge depends on the Head ‘H’, size, shape and form of orifice.

• Usually sharped edge to reduce friction

Whenever there’s discharge through the orifice, the streamlines converge

at a particular section which is termed as vena contracta. This

contraction depends on head, shape and size of orifice.