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Snowfall is measured as an equivalent depth of water because

  • A.snow depth is unrelated to the water it contains
  • B.snow density varies greatly between events
  • C.snow cannot be collected in a gauge at all
  • D.water equivalence is easier to observe directly

Answer: B

Fresh snow density ranges from under fifty to over two hundred kilograms per cubic metre. A single depth figure therefore says little about how much water actually fell. Water equivalent is the quantity that hydrology requires.

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