The area above the water table where soil pores are not fully saturated, although some water may be present. Found on https://www.encyclo.co.uk/local/20094
the zone immediately below the land surface where the pores contain both water and air, but are not totally saturated with water. These zones differ from an aquifer, where the pores are saturated with water. Found on https://www.encyclo.co.uk/local/22449