Open Channel Flow Calculator

Inputs

Solve for Flow Rate (Q) Solve for Depth (y)

Channel Type:

Bottom Width (B): m

Flow Depth (y): m

Channel Slope (S): m/m

Manning’s Roughness (n):

Flow Rate (Q): 0.00 m³/s

Flow Velocity (V): 0.00 m/s

Flow Depth (y): 0.00 m

Wetted Area (A): 0.00 m²

Wetted Perimeter (P): 0.00 m

Hydraulic Radius (R): 0.00 m

Froude Number (Fr): 0.00 (Dimensionless)

Shear Stress ($\tau$): 0.00 N/m²

Critical Depth ($y_c$): 0.00 m

Critical Slope ($S_c$): 0.00 m/m

Material/Channel Type	Manning’s n
Glass	0.010
Plastic, smooth	0.010
Brass, smooth	0.011
Steel, smooth	0.012
Concrete, finished	0.012
Cast iron, new	0.013
Vitrified clay sewer	0.013-0.015
Concrete, unfinished	0.014
Brickwork	0.015
Corrugated metal pipe	0.022
Earth, clean and straight	0.025
Earth, winding, some weeds and stones	0.035
Natural streams, clean and straight	0.030
Natural streams, sluggish, deep pools	0.040
Natural streams, very weedy	0.075-0.150
Gravelly earth	0.029
Rock cut, smooth	0.035
Rock cut, jagged	0.045
Floodplains, pasture	0.035
Floodplains, light brush	0.050
Floodplains, heavy brush	0.075
Floodplains, trees	0.100-0.150