Abstract: “This communication presents a methodology to evaluate the re-aeration rate term in basic dissolved oxygen (DO) deficit models by including some important parameters influencing re-aeration phenomenon in river like turbulence, width, depth and length of streams, which are necessary for fast biochemical oxygen demand (BOD) assimilation in streams. A mathematical model using dimensional approach for rate of re-aeration as well as DO deficits, using basic philosophy of Bhargava (1986) model, is presented. The simulation of data on river Ganges in India, indicate that the predictions of DO deficits are in close agreement with the experimentally observed values. The methodology presented in this paper accounts for all the important factors affecting re-aeration in streams and thus, may offer an alternative to traditionally used approaches for representing re-aeration rate in rivers/streams.”

Keywords: Dissolved, oxygen; BOD, assimilation, DO, deficit, Critical, time, Re-aeration, coefficient, River, Ganges.