| Abstract: | Water quality and processes that affect the dissolved-oxygen concentration in a 45.9 mile reach of the Sangamon River from Decatur to Riverton, Illinois, were determined from data collected during low-flow periods in the summer of 1982. Relations among dissolved oxygen, water discharge, biochemical oxygen demand, ammonia and nitrite plus nitrate concentrations, and photosynthetic-oxygen production were simulated using a one-dimensional, steady-state computer model. Average dissolved oxygen concentrations ranged from 8.0 milligrams per liter at the upstream end of the study reach at Decatur to 5.2 milligrams per liter 12.2 miles downstream. Ammonia concentrations ranged from 45 milligrams per liter at the mouth of Stevens Creek (2.6 miles downstream from Decatur) to 0.03 milligram per liter at the downstream end of the study reach. Un-ionized ammonia concentrations exceeded the maximum concentration specified in the State water quality standard (0.04 milligram per liter) throughout most of the study reach. Model simulations indicated that oxidation of ammonia to form nitrite plus nitrate was the most significant process leading to low dissolved oxygen concentrations in the river. (USGS) |
| Genre: | USGS Numbered Series |
| ProdID: | 29573 |
| Citation Author: | Schmidt, A. R.; Stamer, J. K. |
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| Citation Language: | ENGLISH |
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| Citation Phsyical Description: | vii, 65 p. :ill., maps ;28 cm. |
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| Citation Publisher: | U.S. Geological Survey, Water Resources Division, |
| Citation Series: | Water-Resources Investigations Report |
| Citation Series Code: | WRI |
| Citation Series Number: | 87-4024 |
| Citation Search Results Text: | Assessment of water quality and factors affecting dissolved oxygen in the Sangamon River, Decatur to Riverton, Illinois, summer 1982; 1987; WRI; 87-4024; Schmidt, A. R.; Stamer, J. K. |
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| Citation Year: | 1987 |
| Type: | citation/reference |
| Text: | Assessment of water quality and factors affecting dissolved oxygen in the Sangamon River, Decatur to Riverton, Illinois, summer 1982; 1987; WRI; 87-4024; Schmidt, A. R.; Stamer, J. K. |
| URL (THUMBNAIL): | http://pubs.usgs.gov/wri/1987/4024/report-thumb.jpg |
| URL (DOCUMENT): | http://pubs.usgs.gov/wri/1987/4024/report.pdf |
| Date Other: | Sat, 1 Jan 1994 00:00 -0600 |
| Publisher: | U.S. Geological Survey, Water Resources Division, |
