Sharp Crested Weir

Title: Sharp Crested Weir

Contributor: Harlan Bengtson, Ph.D., P.E. , Former Dean of Engineering, Southern Illinois University Edwardsville

Published Date: September/2016

Content Type: Spreadsheet


This Excel workbook simplifies the following for a sharp-crested weir with specified weir/channel dimensions and head over the weir:

i) determination of whether the flow over the weir is fully contracted or not

ii) determination of which equation should be used to calculate the flow rate over the weir

iii) calculation of the flow rate using the appropriate equation

Worksheets are included for four sharp-crested weir configurations:

i) 90 degree v-notch weir

ii) 25 to 100 degree v-notch weir

iii) contracted rectangular weir

iv) suppressed rectangular weir

Equations used: Francis Equation, Kindsvater-Carter Equation, Kindsvater-Shen Equation, Cone Equation.

All Calculators

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