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The Hudson formula relates armour unit mass to

  • A.the length of the breakwater and its crest elevation above datum
  • B.the wave height, the stability coefficient and the slope
  • C.the wave period taken together with the toe depth alone
  • D.the range of the tide and how long the storm lasted

Answer: B

Mass varies with the cube of the wave height, making the design wave estimate critical. It takes no account of the wave period, the storm duration or the permeability of the structure. Van der Meer added exactly those missing terms.

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