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
Površina presjeka Površina presjeka X
Pipe area, a0 Pipe area, a0 X
Relative area, a/a0 Relative area, a/a0 X
Omočeni opseg, O Omočeni opseg, O X
Hidraulički radijus, R Hidraulički radijus, R X
Najveća širina, T Najveća širina, T X
Tečenja, v Tečenja, v X
Energija tečenja, hv Energija tečenja, hv X
Froudeov broj, F Froudeov broj, F X
Posmično naprezanje average (vučna sila), tau Posmično naprezanje average (vučna sila), tau X
Protok, q (See notes) Protok, q (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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