Free Online Manning Pipe Flow Calculator

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Manning Formula Uniform Pipe Flow at Given Slope and Depth

Related calculators: Looped Pipe Network (Map Interface) · Manning Trapezoidal Channel · Weir Flow Simple · Hazen-Williams Pipe Head Loss [Hide this line]


  Set units: [Hide this line]
Inputs
X
X
X
for Flow, Q = 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

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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, the free culvert program from the U.S. Federal Highway Administration.
Designing a sanitary sewer?
See the minimum sewer slope tables for 4 to 96 inch (100 to 2400 mm) pipe, given in m/m, mm/m and percent, and the peaking factors for very low flows study. Both are reference documents in English only.
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