| Abstract: | Most stations in the U.S. Geological Survey‘s National Stream Quality Accounting Network show no significant trend in either dissolved oxygen concentration or fecal coliform bacteria population for the period October 1974. through October 1981. Of the stations which do show trends, however, most show improved water quality: thirty-one of a total of 276 stations show rising dissolved oxygen concentrations, while only 17 show decreasing concentrations. Decreases in fecal coliform populations have occurred at 21 stations while increases have occurred at only 12 stations.
Approximately half of the stations showing improving trends in dissolved oxygen and fecal coliform bacteria are in the Missouri-Mississippi-Ohio River system. Decreases in dissolved oxygen have occurred at scattered locations in the Western and South-Central States. Rising bacterial populations occur most frequently in the Eastern and Central States
Trends in dissolved oxygen concentration resulting from temperature changes occurring during the study period can be separated from trends caused by chemical or biological processes by analyzing computed values of dissolved oxygen deficit. About half of the observed trends in dissolved oxygen appear to be the result of changes in water temperature. |
| Genre: | USGS Numbered Series |
| ProdID: | 11230 |
| Citation Author: | Smith, Richard A.; Alexander, Richard B. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | [i], 8 p. maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, |
| Citation Series: | Open-File Report |
| Citation Series Code: | OFR |
| Citation Series Number: | 82-1019 |
| Citation Search Results Text: | A study of trends in dissolved oxygen and fecal coliform bacteria at NASQAN stations; 1982; OFR; 82-1019; Smith, Richard A.; Alexander, Richard B. |
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| Citation Year: | 1982 |
| Type: | citation/reference |
| Text: | A study of trends in dissolved oxygen and fecal coliform bacteria at NASQAN stations; 1982; OFR; 82-1019; Smith, Richard A.; Alexander, Richard B. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/of/1982/1019/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/of/1982/1019/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, |
