| Abstract: | In 1991, the U.S. Geological Survey (USGS), U.S. Department of the
Interior, began a National Water-Quality Assessment (NAWQA) program.
The long-term goals of the NAWQA program are to describe the status and
trends of the quality of a large, representative part of the Nation?s surfaceand
ground-water resources, and to identify the natural and human factors
that affect the quality of these resources. Factors such as geomorphology,
climate, hydrology, land use, and land cover that affect water-quality, are
being studied relative to specific water-quality issues that affect large
hydrologic regions of the United States. In addressing these goals, the
NAWQA program will produce water-quality information that will be
useful to policy makers and managers at the National, State, and local
levels.
Because it would be impractical to assess the water quality in the entire
Nation, major activities of the NAWQA program take place within a set of
hydrologic systems called study units. Study units at 60 locations comprise
diverse hydrologic systems of river basins, aquifer systems, or both, ranging
in size from 1,000 mi2 (square miles) to more than 60,000 mi2. These study
units collectively encompass about 45 percent of the land area in the
conterminous United States and represent 60 to 70 percent of the Nation?s
water use and population served by public water supply. |
| Genre: | USGS Numbered Series |
| ProdID: | 44333 |
| Citation Author: | Stark, J. R. |
| Citation Contributing Office: | Minnesota Water Science Center |
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| Citation Language: | ENGLISH |
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| Citation LatN: | 0480000 |
| Citation LatS: | 0423000 |
| Citation LonE: | -0900000 |
| Citation LonW: | -0980000 |
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| Citation Phsyical Description: | 2 p. |
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| Citation Publisher: | U.S. Geological Survey |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 94-101 |
| Citation Search Results Text: | National Water-Quality Assessment Program - The Upper Mississippi River Basin; 1994; OFR; 94-101; Stark, J. R. |
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| Citation Year: | 1994 |
| Type: | citation/reference |
| Text: | National Water-Quality Assessment Program - The Upper Mississippi River Basin; 1994; OFR; 94-101; Stark, J. R. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1994/0101/report-thumb.jpg |
| URL (DOCUMENT): | http://mn.water.usgs.gov/publications/pubs/94_101.pdf |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1994/0101/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey |
