This and rounded as opposed to sub angular to angular in shape. Washed means no fines but with no fines the rounded 3/4" will not settle and lock in places , they'll act like marbles. BUT IT WILL HAVE HIGHEST PERMEABILITY. If you want it to stay in place yet be permeable for quick drainage you need fine sand/ silt sized particle fines and sub angular shape it will compact better, stay that way better. No gravel surface course is immune to being tore up when it gets wet. Mb
