The hydrological circulation process is changing due to urbanization. The clarification of runoff characteristics in urban river basin is vital to the sound development of city. In this paper, WEP model was upgraded to simulate the sewage system process. This model treats sewage system process as the overland flow. It is main feature of this model. Next, this model was applied to Kanda River basin. The inflow to sewage-treatment plant and stream flow was calculated. The result of the simulation was examined by observed value. In the result, it was found that the technique of this model is available.
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