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The Van der Meer formulae improve on Hudson by including

  • A.how saline and how deep the surrounding water happens to be
  • B.the cost of the armour units and their transport distance
  • C.the visual appearance of the completed armour layer
  • D.wave period, storm duration, permeability and damage level

Answer: D

Separate expressions are given for the plunging and for the surging wave conditions. The additional parameters allow a far more discriminating design than the single Hudson coefficient. The extra inputs must themselves be established.

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