Changing Stream Conditions â¢Streams can be âgaining streamsâ along one portion of their length and âlosing streamsâ along another portion, depending upon their relationship to the water table at those points. The beds of many streams are covered by silt and have a low permeability.A rainfall event, flood condition, or man-made discharge can cause the surface of a stream to rise above the elevation of the water table and force water in the stream into the groundwater system.â¢An active water supply well can locally lower the water table and attract the stream water into the groundwater system.
Definition of Pilaster. 1. a rectangular column [n -S] Pilaster Pictures. Click the following link to bring up a new window with an automated collection of images related to the term: Pilaster Images. Lexicographical Neighbors of Pilaster
Pyroclasts (or tephra') are any volcanic fragment that was hurled through the air by volcanic activity. A pyroclastic eruption is one in which the great majority of activity involves fountaining or explosions. A pyroclastic deposit is the resulting layer or pile of material that has fallen to the ground by one or many pyroclastic eruptions. A pyroclastic rock is the hardened, solidified, or compressed version of an originally loose pyroclastic deposit. Spatter (a type of pyroclast) is globs of lava thrown through the air that land while still molten. The word is a combination of âpyroâ or fire, and âclasticâ or made up of many pieces.