Canal Freeboard Calculator

Input Parameters

Unit system

Outputs follow the selected system.

Water level input mode

Choose how Water Surface Level is defined.

Canal type

Defaults adjust base freeboard guidance.

Canal Bed Level * (m)

Same datum as bank/crest level.

Design Water Depth * (m)

Depth at design flow or full supply.

Full Supply Level (auto) (m)

Shown for reference from inputs.

Bank/Crest Level * (m)

Top level to check against required freeboard.

Base freeboard override (m)

If blank, a type-based default is used.

Operational allowance (m)

Covers fluctuations, surging, and control errors.

Settlement allowance (m)

Accounts for embankment consolidation and aging.

Wind speed (m/s)

Used for a simplified wave height estimate.

Wind fetch length (m)

Open water distance over which wind acts.

Wave factor

Multiplies wave height into a freeboard allowance.

Case	Mode	Bed Level (m)	Water Depth (m)	WSL (m)	Crest Level (m)	Required FB (m)	Actual FB (m)	Status