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THE FEUTEX TOOLKIT

Part-Full Circular Channel Geometry

Calculate flow area, wetted perimeter and hydraulic radius of a partially filled pipe.

Hydraulics workspace● Runs in your browser
01 Your input
02 Your result
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FormulaCentral wetted angle θ=2acos(1−2y/D); A=D²(θ−sinθ)/8; P=Dθ/2.
Sources and model references

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

{
  "diameter": 1,
  "depth": 0.25
}

Accuracy and scope

Circular section with a free surface; geometry only, not pressurized-flow analysis. 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.