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An aquitard is a formation that transmits water

  • A.slowly, enough to leak between aquifers
  • B.as freely as an aquifer does
  • C.not at all, under any hydraulic gradient
  • D.only where it is fractured

Answer: A

Correct answer: slowly, enough to leak between aquifers

An aquitard is intermediate: too impermeable to be pumped, but permeable enough that water leaks through it over time and over large areas. Where an aquitard rather than a true aquiclude confines an aquifer, the system is described as leaky, and the leakage supplies a significant part of the water pumped - which the well test analysis must allow for.

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