Cute Young Brunette Girl Wearing Necklace On The Sandy Shore Posing With A Colorful Scarf

Medium - 0.25 to 0.50
Fine - 0.125 to 0.50
Very Fine - 0.0625 to 0.125
Porosity is the volume of void space in the sand. It is the volume of water needed to saturate a given weight of dry sand. Most sands have a porosity of about 30 to 40 % of the total volume. The finer a sand the greater its porosity. Permeability is the rate of flow or drainage of water through the sand. Fine sands have lower permeabilities due to their smaller pore sizes. Penetrability is related to particle size and porosity. It can be important to the macrofauna. All species must be able to burrow into the substratum. To determine the penetrability, the proportion of clay and silt and the water content are very important.