all water which is below the surface of the ground in the saturation zone and in direct contact with the ground or subsoil, water found underground in porous rock strata and soils, as in a spring, water table - the level below which the ground is saturated with water, kogu vesi, mis asub maapinna all küllastumusvööndis ning on otseses kokkupuutes pinnase või aluspõhjaga, maapõues sisalduv vesi; mineraalvesi on põhjavee alaliik