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The purposes of this document are to provide a geographical overview of the Great Basin environment and to provide more resolute descriptions of the ecological features of riparian and stream habitats. The overview is focused on the environmental parameters that influence the distribution, magnitude, flux, and qualities of surface water. The distribution, structure, composition, and dynamics of riparian and stream habitats are interpreted as a response to geologic, hydrologic, geomorphic, pedogenic, and biotic processes. The values of stream and riparian habitats are considered to be a measure of the relative effectiveness of these same processes in determining the qualities of each site.
The Clean Water Act (CWA) requires that wetlands be protected from degradation because of their important ecological functions including maintenance of high water quality and provision of fish and wildlife habitat. However, this protection generally does not encompass riparian areasâ€"the lands bordering rivers and lakesâ€"even though they often provide the same functions as wetlands. Growing recognition of the similarities in wetland and riparian area functioning and the differences in their legal protection led the NRC in 1999 to undertake a study of riparian areas, which has culminated in Riparian Areas: Functioning and Strategies for Management. The report is intended to heighten awareness of riparian areas commensurate with their ecological and societal values. The primary conclusion is that, because riparian areas perform a disproportionate number of biological and physical functions on a unit area basis, restoration of riparian functions along America's waterbodies should be a national goal.
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