River Basin

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river basin

[′riv·ər ‚bās·ən]
The area drained by a river and all of its tributaries.

River Basin


the part of the earth’s surface that includes a layer of water-bearing rock from which waters flow into a separate river or river system. The basin of each river includes surface and underground drainage. A surface drainage area is a part of the earth’s surface from which waters flow into a given river system or river. Underground drainage areas are formed by masses of loose deposits from which the water flows into the river network. In general, surface and underground drainage areas do not coincide; however, since it is practically very complicated to determine the boundaries of an underground drainage area, the size of the river basin is taken to mean only the surface drainage area. Errors arising as a result of the arbitrary identification of the dimensions of a river basin with the surface drainage area may be essential only for small rivers and larger rivers flowing under geological conditions that favor good water exchange among neighboring basins (for example, a karst). The boundary between individual river basins runs along watershed divides.

Basins are divided into drained and undrained types. Undrained basins are intracontinental drainage regions that are not linked to the ocean by river basins. The forms and dimensions of basins are most varied and depend upon geographical position, topography, and the geological structure of the locality. The tributaries have their own small basins whose general confluence composes the area of the basin of the main river.


References in periodicals archive ?
On these same arid high plains, the Powder River Basin produces one-fifth of all the coal in the U.
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Two updates of River Basin Management Plan (in Macedonian and English)
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The objective of this assignment is to develop linked River Basin Management Plan and a Preliminary Flood Risk Assessment for Strumica River Basin in accordance with the pertaining EU regulations and national laws.
Weather permitting, spraying will begin in the Susquehanna River Basin Wednesday and in the Allegheny River Basin on Thursday.
A federal district court has approved, pending further order of court, a stipulation that prevents the Susquehanna River Basin Commission (SRBC) from enforcing new regulations.