Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

Related calculators: Manning Pipe Head Loss · Irrigation Pressure · Microhydropower · Manning Pipe Flow spreadsheet [Hide this line]

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Solve for y/d0 given Q — Using d0, n, and Sf from the calculator form, finds the lowest y/d0 for a given Q.
Flow, Q:


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Inputs
X
X
X
X
Results
Flow depth, y Flow depth, y X
Flow area, A Flow area, A X
Pipe area, A0 Pipe area, A0 X
Relative area, A/A0 Relative area, A/A0 X
Wetted perimeter, Pw Wetted perimeter, Pw X
Hydraulic radius, Rh Hydraulic radius, Rh X
Top width, T Top width, T X
Velocity, v Velocity, v X
Velocity head, hv ? Velocity head, hv ? X
Velocity check Velocity check X
Froude number, Fr Froude number, Fr X
Average shear stress, τ Average shear stress, τ X
Flow, Q ? Flow, Q ? 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 estimate the headwater depth, or see my 2-minute tutorial for standard culvert headwater calculations using HY-8.

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