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Open-Channel Flow

This calculator uses Chézy and Manning's formula to calculate the wetted perimeter, hydraulic radius, flow area, Chézy coefficient and flow velocity.

For experimental values of Manning's n factor, click here
Required Information
Enter the Slope:
Enter the Channel Top Width (ft):
Enter the Channel Bottom Width (ft):
Enter the Channel Height (ft):
Enter the Flow Depth (ft):
Enter the n value:
Results
The wetted perimeter is ft
The flow is ft3/s
The flow area is ft2
The flow is gal/min
The hydraulic radius is ft
The velocity is ft/s
The C value is