Ground-water flow in which the available pore space is only partially filled with water. SUTRA is capable of simulating both saturated and unsaturated flow. See Sections 2.1, 2.2, and 7.5 of the SUTRA documentation, and " Unsaturated flow functions" on the " Special topics" page.
Underground water flow through soil or rock where the void spaces are filled both with water and air.
Movement of water in a soil thatis not filled to capacity with water.
Movement of water in a porous medium in which the pore spaces are not filled with water and the direction of flow is from the wetter zone of higher potential to one of lower potential.
The flow of water in soil or rock that is not water-saturated.
The movement of water in the soil that is not completely filled with water.