Discussion
A stepped seawall profile is used chiefly because it
Answer: A
Correct answer: dissipates energy while providing pedestrian access to the beach
The steps serve two purposes at once, which is why they are so common on promenades. Hydraulically each tread breaks up the uprush and dissipates some of its energy, so reflection is lower than from a plain vertical face. Practically they are a staircase, giving the public a way down to the sand. They do not reduce the material required, and the toe still needs protecting.
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