The base level of a river or stream is the lowest point to which it can flow, often referred to as the `mouth` of the river. For large rivers, sea level is usually the base level, but a large river or lake is likewise the base level for tributary streams. All rivers and streams erode toward sea level, which is also known as the `ultimate base l......
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http://en.wikipedia.org/wiki/Base_level
The lowest level to which a stream can erode the channel through which it flows, generally equal to the prevailing global sea level.
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http://www.encyclo.co.uk/local/22291
The lower limit of erosion by a stream. Sea level is the ultimate base level. However, lakes can ser
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http://www.encyclo.co.uk/local/22392
The level below which a stream cannot effectively erode. Sea level is the ultimate base level, but lakes form temporary base levels for inland drainage systems.
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http://www.evcforum.net/WebPages/Glossary_Geology.html
The subterranean elevation below which a stream cannot vertically erode sediment. For many streams this hypothetical elevation is sea-level.
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http://www.physicalgeography.net/physgeoglos/b.html
The level below which a stream cannot erode; usually sea level sometimes locally the level of a lake or resistant formation.
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http://www.scientificpsychic.com/etc/geology-glossary.html
Of a stream is the point below which the stream cannot cut. A temporary base level along a stream, such as a lake may be removed by stream action . Ultimate base level is the ocean.
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https://www.encyclo.co.uk/local/22327
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