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Rainfall of 50 millimetres per hour would be classified as

  • A.light
  • B.moderate
  • C.trace
  • D.very heavy

Answer: D

Conventional thresholds place light rain below about two and a half millimetres per hour and heavy rain above about ten. Fifty is well beyond that and is associated with flash flood risk. Rates of this order overwhelm most urban drainage systems.

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