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A knowledge of the rate at which pollutants disperse in streams is essential to stream management. It was the purpose of this investigation to develop a simple method for predicting longitudinal dispersion coefficients from mean flow parameters. An analogy was used between the linear one-dimensional flow equation and the linear one-dimensional dispersion equation to define a relation between the solute dispersion coefficient and the flow dispersion coefficient. The flow dispersion coefficient is calculated from mean flow parameters, thus allowing predictions of solute dispersion once the relation between the two is known. Dispersion coefficients calculated by the simple method are compared with observed values for 18 streams that cover a wide range of flow conditions. A standard error of estimate of 30% is indicated.
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McQuivey et al. (1974) studied this question.
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