Question:
It is provided as a safety measure against overtopping of channels due to wave action or other unforeseen reasons is
It is provided as a safety measure against overtopping of channels due to wave action or other unforeseen reasons is
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Freeboard is the "safety margin" of a canal.
Updated On: May 5, 2026
- Free board
- Hydraulic slope
- Hydraulic radius
- Wetted perimeter
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The Correct Option is A
Solution and Explanation
Step 1: Concept
In channel design, you never fill the canal exactly to the top of the bank.
Step 2: Meaning
You leave an extra vertical distance between the maximum water level and the top of the canal bank.
Step 3: Analysis
This extra space, called freeboard, prevents water from spilling over the sides (overtopping) if there are ripples, waves, or a sudden increase in water volume.
Step 4: Conclusion
This safety distance is known as freeboard.
Final Answer: (A)
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