| 1. | the planar, underground surface beneath which earth materials, as soil or rock, are saturated with water. |
| 2. | Architecture. a projecting stringcourse or similar structural member placed so as to divert rain water from a building. |
| water table n.
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The depth (measured from the surface of the Earth) at which underground water is first encountered.
| water table
The upper surface of an area filled with groundwater, separating the zone of aeration (the subsurface region of soil and rocks in which the pores are filled with air and usually some water) from the zone of saturation (the subsurface region in which the pores are filled only with water). Water tables rise and fall with seasonal moisture, water absorption by vegetation, and the withdrawal of groundwater from wells, among other factors. The water table is not flat but has peaks and valleys that generally conform to the overlying land surface. Compare potentiometric surface. |