Manning uniform-channel flow

Manning uniform-channel flow with explicit inputs, units and reproducible calculations.

Inputs

• Flow area (m²)
• Wetted perimeter (m)
• Energy slope (%)
• Assumed Manning n (s/m¹ᐟ³)

Assumptions and limitations

Steady uniform open-channel flow. n and energy slope are supplied assumptions, not recommended design values. Does not determine normal depth or validate a physical cross section.

Source

Calculation source

Interactive calculators require JavaScript and the calculation service.