Discussion
Consider the following statements about recurved seawalls.
1. They allow a lower crest for the same overtopping performance.
2. The recurve itself attracts a substantial local loading.
3. They eliminate overtopping entirely under all conditions.
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: because the recurve reduces overtopping, the same performance can be had from a lower crest, which saves material and preserves the view; and the recurve itself takes a heavy local load. Statement 3 claims too much. No wall eliminates overtopping under all conditions - a sufficiently severe storm surge with large waves will overtop any practicable crest, and the design is set to an acceptable discharge, not to zero.
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