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How do you tell the difference between porosity and permeability?

Porosity and Permeability

An aquifer needs to be porous and permeable - but what's the difference? Porosity is the amount of void space in a rock or other earth material (like a sand deposit) - in other words, it's how much water a material can hold.

Permeability refers to how well water flows through a material - that's controlled by how large the pores are, and how well connected they are.

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