Crust Permeability Porosity refers to how easily water passes through sediments and rock.
Permeability is a function of the size of pore openings.
If sediments are well sorted, pore spaces are uniformly sized, thereby allowing for groundwater flow readily between individual sediment particles. If sediments are poorly sorted, pore spaces are filled with smaller sediments, thereby reducing the movement of water through the deposits. These deposits will supply lower volumes of groundwater.