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Rectangular Weir Discharge Calculator

Simplified calculator to measure the water discharge rate over a suppressed or contracted rectangle shaped weir. This is based on Francis formula.

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Rectangular Weir Discharge Calculation

Head on the Weir (h) = m
Width of the Weir (b) = m


Water Flow Rate = m³/s

 
   
  
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Formula
The Francis equation is as follows
    q = 3.33 ×( b - 0.2×h ) ×h3/2

Where,
    q = Flow Rate
    b = Width of the Weir
    h = Head on the Weir

The discharge rates of open channels such as streams can be measured using this rectangular weir calculator.