Abstract

The water quality model QUAL2E has been applied worldwide to modeling dissolved oxygen (DO) and biochemical oxygen demand (BOD) in rivers. The model is an important management tool for environmental impact studies, however a difficulty relating to its application for DO and BOD computations is the quantification of the re-aeration or re-oxygenation coefficient K, The procedure used to establish K, is extremely important if the model is to represent real water stream conditions. A simple methodology for estimating QUAL2E input parameters related to re-aeration coefficient calculations based on open channel hydraulic characteristics is described in this chapter. It aims to give guidelines to professionals and researchers who plan to use QUAL2E. A brief review of the re-aeration process in water streams is briefly reviewed.

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