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Bazin Formula for Weirs Formulae and Calculator

Bazin Formula for Weirs Formula and Calculator

The Bazin formula (lengths from 1.64 ft to 6.56 ft under heads from 0.164 ft to 1.969 ft) is

${\displaystyle Q=(3.25+\frac{0.0789}{H})[1+0.55{\left(\frac{H}{H+Z}\right)}^2]b{H}^{3/2}}$

The bracketed term becomes negligible for low velocities of approach.

where
H = head on weir in feet (or meters) (height of level liquid surface above crest)
b = length of weir crest in feet
Q = flow in cfs
Z = height of the weir crest above the channel bottom feet

Source:

Schaum's Outline of Fluid Mechanics and Hydraulics

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