Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

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Protoka, q Protoka, q X
Tečenja, v Tečenja, v X
Energija tečenja, hv Energija tečenja, hv X
Površina preseka Površina preseka X
Okvašeni obim, O Okvašeni obim, O X
Hidraulički radijus, R Hidraulički radijus, R X
Najveća širina, T Najveća širina, T X
Frudov broj, F Frudov broj, F X
Napon smicanja average (vučna sila), tau Napon smicanja average (vučna sila), tau 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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