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A serviceability limit state for a coastal structure concerns

  • A.conditions under which the structure ceases to function acceptably
  • B.conditions under which the structure collapses entirely and is lost
  • C.the cost of constructing the structure within the available budget
  • D.the visual appearance of the finished structure from the landward side

Answer: A

Excessive overtopping or minor armour displacement are the typical serviceability failures. The ultimate limit state by contrast concerns the loss of the structure itself. The two are assessed against different return periods.

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