Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

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Debit Debit X
Viteză Viteză X
Presiunea dinamică Presiunea dinamică X
Secţiune de curgere Secţiune de curgere X
Perimetrul secţiunii de curgere Perimetrul secţiunii de curgere X
Raza hidraulică Raza hidraulică X
Laţimea suprafeţei libere Laţimea suprafeţei libere X
Numărul Froude Numărul Froude X
Efort tangenţial promedio Efort tangenţial promedio X


This is the flow and depth inside the pipe.
Getting the flow into the pipe may require significantly higher headwater depth. Add at least 1.5 times the velocity head to get the headwater depth or see my 2-minute tutorial for standard culvert headwater calculations using HY-8.

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