Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

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Inputs
X
X
X
X
Results
Protok, q Protok, q X
Tečenja, v Tečenja, v X
Energija tečenja, hv Energija tečenja, hv X
Površina presjeka Površina presjeka X
Omočeni opseg, O Omočeni opseg, O X
Hidraulički radijus, R Hidraulički radijus, R X
Najveća širina, T Najveća širina, T X
Froudeov broj, F Froudeov broj, F X
Posmično naprezanje average (vučna sila), tau Posmično naprezanje average (vučna sila), tau X

Notes:

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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