Surface of the water in wells, water wheels, ditches, volcanoes, caves, sinkholes, shots of mine and other cavities. Usually refers to the depth on the surface of the ground. In this context, a synonym is «phreatic level»: the bound down soil where begins the water mantle or aquifer. The phreatic adjective comes from the Greek noun "phréar, phréatos": nominative and genitive singular of pozo.
