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Claimed precipitation increases from orographic seeding are typically of the order of

  • A.five hundred per cent
  • B.under one tenth of a per cent
  • C.five to fifteen per cent
  • D.one hundred per cent

Answer: C

Correct answer: five to fifteen per cent

This is the range claimed by orographic programmes, and it is worth noticing what it implies for evaluation: an effect of that size is far smaller than the natural variability from one season to the next, so many seasons of randomised operation are needed before it can be distinguished from chance.

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