Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

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Flow depth, y Flow depth, y X
Secţiune de curgere Secţiune de curgere X
Pipe area, a0 Pipe area, a0 X
Relative area, a/a0 Relative area, a/a0 X
Perimetrul secţiunii de curgere Perimetrul secţiunii de curgere X
Raza hidraulică Raza hidraulică X
Laţimea suprafeţei libere Laţimea suprafeţei libere X
Viteză Viteză X
Presiunea dinamică Presiunea dinamică X
Numărul Froude Numărul Froude X
Efort tangenţial promedio Efort tangenţial promedio X
Debit (See notes) Debit (See notes) X
Full flow, Q0 Full flow, Q0 X
Ratio to full flow, Q/Q0 Ratio to full flow, Q/Q0 X


This is the flow and depth inside an infinitely long 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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