Abstract:
Dissolved oxygen (DO) is an important parameter indicating the health of the stream. There is a continual utilization (deoxygenation) and/or replenishment (reaeration) of dissolved oxygen due to the influx of waste load in the stream at different points. Estimating deoxygenation and reaeration rate coefficients, using indirect approach supplemented by calculations, provides one of the most reliable techniques. In addition, laboratory and field experiments can provide information on relative ranges of deoxygenation and reaeration rates.
In the present study, the concept of Streeter and Phelps (1925) with exponential law of non-settleable BOD and laboratory experiments have been applied to estimate the reaeration rate and deoxygenation rate coefficients, respectively, for different reaches of the Kali River, U.P., India. A total of 270 field data sets have been collected during the period from March 1999 to February 2000. A predictive equation has been proposed to obtain the reaeration equation for the River Kali using a least square algorithm that minimizes error estimates and improves correlation between observed and computed reaeration coefficients.
