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Comparing porosity with specific yield as a measure of available water, specific yield

  • A.counts all the water the rock holds
  • B.exceeds the porosity in fine-grained rock
  • C.is identical to the porosity in every case
  • D.counts only the water that will drain

Answer: D

Subtracting the specific retention leaves the fraction gravity will actually release, which is what a well can obtain. In a clay that difference is nearly the whole of the porosity, which is why porosity alone misleads.

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