Discussion
Assertion (A): Crest level is frequently governed by overtopping rather than strength.
Reason (R): The tolerable discharge for the use behind may demand more freeboard than stability does.
Answer: C
Correct answer: Both A and R are true, and R is the correct explanation of A
Both are true and the reason states the relation. A structure strong enough to survive the design wave may still be too low to keep the overtopping discharge within what a promenade, a road or a building behind can tolerate, so the crest is raised beyond what stability requires. Where the land behind is open and can accept water, the reverse holds and the crest can be lower.
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