In order to describe or reproduce the real water conditions in the river, we propose a method for adjustment of the observed data which we obtained in our river survey. By using these adjusted parameters, the mass-balances of flux and pollutants hold well, so we define it as a “reasonable water condition. And also, these reasonable parameters were used in models based on the Streeter-Phelps equation describing self purification in a river. The results predicted by these model studies were then compared with the actual conditions in the Tama River. In some cases it was possible, and permissible, to make modifications to the model which improved the agreement between the predicted and the observed results; in other cases, this was not permissible. It was concluded that self purification due to biological oxidation is described satisfactorily by the modified model.

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