Open Channel Flow Calculator

Calculate flow velocity and discharge in open channels using Manning's equation for uniform flow.

Width of the channel base.
m
Depth of water in the channel.
m
Channel slope. Typical: 0.0001 to 0.01.
Roughness coefficient. Concrete: 0.013, Earth: 0.025, Grass: 0.035.
Horizontal distance per unit vertical. 0 for rectangular.

Results

Flow Area-m²
Wetted Perimeter-m
Hydraulic Radius-m
Flow Velocity-m/s
Discharge-m³/s
References: Chow — Open Channel Hydraulics; ASCE Manual of Practice