The document discusses the vertical distribution of groundwater. It is divided into two main zones: the zone of aeration near the surface and the zone of saturation below. The zone of aeration includes the soil water zone, intermediate vadose zone, and capillary zone. The capillary zone extends up from the water table due to capillary action. Below this is the zone of saturation, where all pores and spaces are filled with water under pressure. The boundary between these zones is the water table.