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This study aims at predicting water quality according to the construction of industrial complex near water intakes of drinking water for Busan citizens. In case of mean flow rate and proper operations for gates of Nakdong barrage, the effect of the Sogam river near new industrial complex may not give any negative water qualities in Nakdong River. If the severe drying period through the year may happen to Nadong River, and also, If the gates of the Nakdong barrage may not open to maintain water level to able to intake water, the lower part of Nakdong River may acts as a reservoir which has mainly strong dispersion phenomenon. the results of CFD(Computational Fluid Dynamics) model is anticipated to predict or explain water quality according to the construction of industrial complex near water intakes of drinking water for Busan citizens. It is estimated that The relevant concentration of Sogam River for water quality of the intakes for drinking waters of Busan citizens corresponds to 18 %.