A review of the USGS National Water Quality Assessment Pilot by Unknow

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There are many implications of such a vast scope. First of all, except in a few special cases, uniform national assessments are precluded. Understanding must almost always be developed on regional or smaller scales and a national picture must be assembled as a composite of these smaller-scale assessments. , number of stream miles with low average dissolved oxygen concentrations. Second, a national assessment must be a multidisciplinary undertaking and a work environment and management structure must be established that fosters interactions between different disciplines.

Synoptic sampling will be a valuable tool for examining relations between land use and water quality conditions. The committee is concerned whether the land-use data will be: • • • • available in a timely manner, classified in adequate detail, of the proper scale and resolution, and updated frequently enough to be useful for documenting cause and effect relationships in long-term trends. It is clear that NAWQA's ability to ascertain cause and effect relationships lies primarily with the selected reach studies.

Low-level sampling and analysis 1 year 1 year 3 years 1 year 4 years The project planning and retrospective phases actually overlap during the first 2 years of an initial assessment cycle. Some reconnaissance sampling also will occur during these first 2 years. After completion of the initial cycle in a particular study unit, the project planning and retrospective phases would require only one year. Thus, after the initial cycle, subsequent assessment cycles would consist of 4 years of high activity (intensive data collection, data analyses, and report preparation), followed by 4 years of low-level activity.

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