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The orifice equation describes the rate of flow of liquid through an orifice.
The equation can be represented as:
where Q = flow (cubic metres per second)
C(d) = coefficient of discharge
A = area of orifice (square metres)
g = acceleration from gravity (9.81 m/s^2)
h = head acting on the centreline (m)
For a circular orifice, the equation becomes:
Typical values for the coefficient of discharge are:
Sharp orifice: 0.62