// multi-utility computation suite · offline · instant · precise
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eng.open-channel-flow-manning Calculator
Calculates open channel flow rate and velocity using Manning's equation from channel geometry, roughness, and slope. Manning's n roughness coefficient ranges from 0.010 (concrete) to 0.03 (natural stream) — flow rate is highly sensitive to both roughness and slope.
Inputs
Channel Slope
Reference formula or conversion factor shown for context.
Manning N
Reference formula or conversion factor shown for context.
Flow Depth M
Vertical extent downward, or thickness of a layer. For tanks: affects pressure at the base (P = ρgh).
Channel Width M
Horizontal extent perpendicular to the length.
Results
flow rate Q (m³/s)
Flow rate Q — the volume of fluid passing a point per unit time.
velocity V (m/s)
Reference formula or conversion factor shown for context.
Froude number Fr
Sample size or count used in the calculation.
flow type
The classification or type assigned based on the inputs.