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Specific yield is the fraction of a saturated rock's volume that

  • A.remains held against gravity
  • B.consists of solid grains
  • C.is occupied by air at all times
  • D.drains under gravity

Answer: D

Together with specific retention it makes up the total porosity, and it is the figure that determines how much water an unconfined aquifer will actually give. A clay's specific yield is very small despite a high porosity.

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