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The commonest reason a coastal structure fails to achieve its objective is that

  • A.the contractor built it in the wrong location
  • B.the structure was constructed during the winter
  • C.it was aimed at the wrong cause of the problem
  • D.the concrete used was of insufficient strength

Answer: C

Correct answer: it was aimed at the wrong cause of the problem

A structure that is well designed, well built and in the right place will still fail to achieve anything if it addresses a process that is not the one causing the erosion - groynes on a frontage losing sediment offshore, or a detached breakwater where the loss is a drift deficit. Diagnosis of the sediment budget and the wave climate therefore precedes the choice of structure, and it is the step most often skipped.

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