Discussion
Assertion (A): A seawall can eventually undermine its own foundation.
Reason (R): Wave reflection scours the toe and lowers the beach in front of it.
Answer: A
Both are true and the reason gives the mechanism, and toe protection is provided for this reason. Toe scour is the commonest single cause of seawall failure. Toe protection is not an optional extra. Scour undermines the foundation the wall stands on.
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