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Compatibility of borrow material in nourishment is judged mainly on

  • A.the distance over which the material has had to be transported
  • B.the depth from which the material was dredged
  • C.grain size distribution relative to the native beach sand
  • D.the colour of the imported material

Answer: C

Finer material than the native sand is winnowed away rapidly and the fill fails. An overfill ratio is applied to allow for the losses expected from the finer fraction. Borrow material is characterised carefully before use.

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