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

Promjer cijevi, d₀		X
Manningov koeficijent hrapavosti, n		X
Linijski gubitak pritiska (moguće ? jednak nagibu cijevi), S₀		X
Udio ispunjenosti cijevi (u % visine promjera)		X

Results

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, h_v	Energija tečenja, h_v		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

Notes:

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.