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Discussion

The design return period for a coastal structure is chosen from

  • A.how far the structure extends along the coast in plan
  • B.the depth of water at the toe of the proposed structure
  • C.the state of the tide while the works are being built
  • D.the consequence of failure and the intended design life

Answer: D

A higher consequence of failure justifies a longer return period and a larger structure. Encounter probability over the whole design life is the quantity that actually matters. Consequence of failure drives the whole selection.

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