| Abstract: | Introduction:
This report is the companion data report for: Nutrients in Streams and Rivers Across the Nation - 1992-2001 (D.K. Mueller and N.E. Spahr, U.S. Geological Survey written commun., 2005).
The data contained in this report were collected as part of the National Water-Quality Assessment (NAWQA) Program. Investigations were conducted in 51 large river basins and aquifer systems, which are referred to as ‘study units.‘ Implementation of study-unit investigations were phased so that high-intensity sampling occurred in about one-third of the study units at a time. Investigations in the first 20 study units began in 1991, and stream sampling began in 1992; however, most samples were collected during water years 1993-95. (Water year is defined as the period from October through September and is identified by the year in which it ends.) A second group of 16 study-unit investigations began in 1994, with most of the sampling completed during water years 1996-98. A third group, consisting of 15 study units, began in 1997 with most of the data collected during water years 1999-2001. At some sites, additional sampling continued after the high-intensity time period. Gilliom and others (1995) provide additional information about study-unit sampling design. Additional information about the NAWQA program is available at http://water.usgs.gov/nawqa/index.html. |
| Genre: | USGS Numbered Series |
| ProdID: | 72807 |
| Citation Author: | Mueller, David K.; Spahr, Norman E. |
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| Citation Edition: | Online only |
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| Citation Language: | ENGLISH |
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| Citation No Pagination: | Y |
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| Citation Online Only Flag: | Y |
| Citation Phsyical Description: | unpaginated; map; data files |
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| Citation Series: | Data Series |
| Citation Series Code: | DS |
| Citation Series Number: | 152 |
| Citation Search Results Text: | Water-quality, streamflow, and ancillary data for nutrients in streams and rivers across the nation, 1992-2001; 2005; DS; 152; Mueller, David K.; Spahr, Norman E. |
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| Citation Year: | 2005 |
| Type: | citation/reference |
| Text: | Water-quality, streamflow, and ancillary data for nutrients in streams and rivers across the nation, 1992-2001; 2005; DS; 152; Mueller, David K.; Spahr, Norman E. |
| URL (THUMBNAIL): | http://pubs.er.usgs.gov/thumbnails/usgs_thumb.jpg |
| URL (INDEX PAGE): | http://pubs.usgs.gov/ds/2005/152/ |
| Date Other: | Mon, 2 Jan 2006 00:00 -0600 |
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