Simple Weir Flow Calculator

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Simple Weir Flow Calculator

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Weir length, l

Headwater height, h

Weir coefficient, Cw (Depends on weir. For a broad-crested weir, varies from 2.3 to 3.3 for feet units depending on crest width, depth, and upstream edge shape)

Flow, qFlow, q

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Weir Equation
q = cw * l * h1.5
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