The prediction of water quality in natural rivers requires the solution of the mass-transport equation. The accuracy of the numerical solution is highly dependent upon the accuracy of longitudinal dispersion coefficient. The values of dispersion coefficients calculated form easured concentrations in Wkra River have been compared with values calculated using existing empirical equations for the dispersion coefficient. Using statistical methods for analysis, has shown that the accuracy of calculated values is good for McQuivey and Keefer formulation.
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