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Pre-filling a groyne field with imported sand is done to

  • A.reduce the cost of constructing the groynes themselves
  • B.raise the tidal range experienced within the groyne field itself
  • C.avoid trapping the drift that would otherwise feed downdrift
  • D.increase the volume of drift the groynes will intercept

Answer: C

The compartments are filled artificially so that the natural drift passes through. Without it the field fills at the expense of the coast downdrift. Pre-filling is now regarded as standard practice. It removes the downdrift penalty almost entirely.

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