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The modified tracer technique was used to determine reaeration-rate coefficients in the Wabash River in reaches near Lafayette and Terre Haute, Indiana, at streamflows ranging from 2,310 to 7,400 cubic feet per second. Chemically pure (CP grade) ethylene was used as the tracer gas, and rhodamine-WT dye was used as the dispersion-dilution tracer. Reaeration-rate coefficients determined for a 13.5-mile reach near Terre Haute, Indiana, at streamflows of 3,360 and 7,400 cubic feet per second (71 and 43 percent flow duration) were 1.4 and 1.1 day"1 at 20° Celsius, respectively. Reaeration-rate coefficients determined for a 18.4-mile reach near Lafayette, Indiana, at streamflows of 2,310 and 3,420 cubic feet per second (70 and 53 percent flow duration), were 1.2 and 0.8 day"1 at 20° Celsius, respectively. None of the commonly used equations found in the literature predicted reaeration-rate coefficients similar to those measured for reaches of the Wabash River near Lafayette and Terre Haute. The average absolute prediction error for 10 commonly used reaeration equations ranged from 22 to 154 percent. Prediction error was much smaller in the reach near Terre Haute than in the reach near Lafayette. The overall average of the absolute prediction error for all 10 equations was 22 percent for the reach near Terre Haute and 128 percent for the reach near Lafayette. Confidence limits of results obtained from the modified tracer technique were smaller than those obtained from the equations in the literature.

Determination of reaeration-rate coefficients of the Wabash River, Indiana, by the modified tracer technique