Sharp-Crested Rectangular Weir

How to use this tool

1. Enter every input in the labeled units; use measured or independently specified properties.
2. Check the stated model assumptions before calculating.
3. Interpret the output as a model estimate and verify it independently for the intended application.

Try this example

{
  "width": 1,
  "head": 0.2,
  "cd": 0.62,
  "uncertainty": 0.005
}

Accuracy and scope

Free ventilated nappe with negligible approach velocity; effective width and coefficient supplied independently. Educational engineering estimate only; not structural or safety certification, equipment selection, or operating recommendations.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.