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Porosity and PermeabilityAn aquifer needs to be porous and permeable - but whatīs the difference? Porosity is the amount of void space in a rock or other earth material (like a sand deposit) - in other words, itīs how much water a material can hold. Permeability refers to how well water flows through a material - thatīs controlled by how large the pores are, and how well connected they are.
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