Phreatic surface definition
Phreatic surface means the free-water surface of a zone of seepage; it is represented by the uppermost flow line, or seepage line, in a flow net.
Phreatic surface means a surface that represents the water level in an unconfined saturated zone.
Phreatic surface means the upper surface of the water table within the mass of the dam. It is the elevation of the water surface if an open hole were dug into the dam.
More Definitions of Phreatic surface
Phreatic surface means a free surface of water seeping at atmospheric pressure through soil or rock;
Phreatic surface means the upper surface of an unconfined aquifer at which water pressure is equal to atmospheric pressure.