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All of the following are inputs to a coastal structure design EXCEPT

  • A.the geotechnical properties of the sea bed
  • B.the number of visitors expected at the site each year
  • C.the design wave height at the structure toe
  • D.the extreme water level for the chosen return period

Answer: B

Correct answer: the number of visitors expected at the site each year

Visitor numbers may bear on the amenity case for a scheme and on the tolerable overtopping discharge if people stand behind the crest, but they are not an engineering input to the structure itself. The design proceeds from the wave height at the toe, the extreme water level for the chosen return period, and the geotechnical properties of the bed, which between them fix the armour, the crest level and the foundation.

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