How are porosity and permeability related?

I'm going to assume that you are asking about these terms in their relationship to science, so here is what I know:

Porosity is the amount of empty space in a rock or other earth material (like sand) - in other words, it's how much water a material can hold.

Permeability refers to how well water flows through a material - the flow is controlled by how large the pores are and how well connected the pores are in a given object.

Therefore, there these are two primary factors that limit the movement and the amount of water (or other fluids) retained  in rocks/sedimentary materials.

I hope this helps you in your quest for an answer. If you need more information, I suggest researching your question on google.com. Good luck.