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A well in granite gives a good yield at one location and almost none 50 m away. The explanation is that yield depends on

  • A.the granite's primary porosity
  • B.the depth of the borehole alone
  • C.the diameter of the casing used
  • D.intersecting a fracture network

Answer: D

Crystalline rock has negligible pore space, so the water is entirely in the fractures and a borehole either strikes them or does not. It is why hard rock yields vary so sharply over short distances and why siting matters.

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