Discussion
Three of the following make a formation a good aquifer. The exception is
Answer: C
Correct answer: very fine grain size with poorly connected pores
Fine, poorly connected pores are what make clay a poor aquifer despite its high porosity: the viscous resistance is enormous and much of the water is held to the mineral surfaces. The other three are all favourable - high interconnected porosity provides both storage and flow paths, substantial saturated thickness gives transmissivity, and in hard rock a well-developed fracture network supplies the permeability the intact rock lacks.
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