Coastal rivers play a crucial role in replenishing sand lost from beaches. In Northern California, the larger, perennial rivers carry sediments eroded from ...
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Fish assemblages of perennial floodplain ponds of the Sacramento River
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de F FEYRER - 2004 - Citado por 13 - Artigos relacionados
Fish assemblages of perennial floodplain ponds of the Sacramento River ...
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Perennial stream - Wikipedia, the free encyclopedia
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A perennial stream or perennial river is a stream or river (channel) that has continuous flow in parts of its bed all year round during years of normal ...

http://www.google.com/search?sourceid=captaincaveman&hl=en-U...

This is the way I have always seen it worded in environmental documents referring to nature.

Mike

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Note added at 15 mins (2011-06-19 18:57:01 GMT)
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Thomas Aquinas: Commentary on Aristotle's Meteorology: English This is a detail common to various explanations: whether the perpetuity of rivers is explained by large subterranean depths containing much water, ...
dhspriory.org/thomas/Meteora.htm - Cached

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Note added at 16 mins (2011-06-19 18:57:44 GMT)
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Preservation in perpetuity of Streams 10 (lower reach), 12 and 'l6 constitutes a portion of the compensatory mitigation; a ...
www.epa.state.oh.us/LinkClick.aspx?fileticket=cfSNIxiwxDg=&...