Water Quality Features of the Upper Illinois Waterway
REPORT OF INVESTIGATION 79 Water Quality Features of the Upper Illinois Waterway by THOMAS A. BUTTS, RALPH L. EVANS, and SHUNDAR LIN Title: Water Quality Features of the Upper Illinois Waterway. Abstract: The dissolved oxygen resources of the Upper Illinois Waterway are de pressed because of a combination of oxygen demand sources including carbonaceous and nitrogenous BOD, benthic biological extraction, and sediments. Because of these demands, maintenance of 6.0 mg/l DO in the stream system is difficult, and achieve ment of a minimum DO requirement of 5.0 mg/1 requires the nitrogenous and carbona ceous demand be substantially reduced. Water quality data obtained from field sur veys are summarized together with hydraulic and hydrologic data to determine waste water treatment needs. Collection of the waterway algal types reveals that diatoms are the dominant group comprising about 85 percent of the total densities. However, algal concentrations do not impair use of the waterway for recreation. Fecal coliform bac teria densities decrease with downstream movement at a rate of 0.77 per day in the upper pools and 0.42 per day in the lower pools. About 9 percent of the total coliform bacteria population are fecal coliforms. Only 3 of 19 stations sampled met the bac terial quality standards required by the Illinois Pollution Control Board. Reference: Butts, Thomas A., Ralph L. Evans, and Shundar Lin. Water Quality Fea tures of the Upper Illinois Waterway. Illinois State Water Survey, Urbana, Report of Investigation 79, 1975. Indexing Terms: Algae, bacteria, benthic organisms, coliforms, hydraulic-hydrologic models, modeling, nitrogen, oxygen demand, sediments, streams, water pollution con trol, water quality, water temperature.
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