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Flash flooding depends on the rainfall rate rather than the total because

  • A.the rate determines the drop size distribution
  • B.the ground can only absorb water at a limited rate
  • C.total rainfall is impossible to measure accurately
  • D.high rates always occur over larger areas

Answer: B

Once the rate exceeds the infiltration capacity the excess runs off immediately. A given total falling slowly may cause no flooding at all while the same total in an hour is dangerous. Infiltration capacity is the quantity that actually matters.

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