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Weir Flow Calculator

Calculate flow over rectangular and V-notch weirs.

Enter the weir type (rect=1, v90=2) value for this calculation.
Linear measurement in the specified unit.
ft or °
Enter the head on weir value for this calculation.
ft
Ending or resulting value.

Results

Flow Rate:
Calculated flow rate.
-cfs
Flow Rate:
Calculated flow rate.
-GPM
Reference: AWWA/EPA Standards. Francis and Thomson weir equations.