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Analysis of Water Pollutant Load Characteristics and Its Contributions During Dry Season: Focusing on Major Streams Inflow into South-Han River of Chungju-dam Downstream

Water pollution in the South-Han River located downstream of Chungju Dam during dry season is getting worse due to the deteriorating water quality and reduced flow rates. Thus, the objectives of this study were to analyze the pollutant load characteristics in the main streams inflow into the South-Han river and to evaluate its contribution to the water pollution in the river during dry season for selecting the priority major stream and pollution sources. the greatest pollutant loads and the contribution ratio to water pollution in the South-Han river were analyzed in the Seomgang. Also, the largest proportion of total pollutant loads occurred by the point source and baseflow during monitoring periods was also analyzed in the Seomgang. In addition, the results of analysis of the Nationwide water pollution source survey showed that the total pollutant loads discharged from the Seomgang was the greatest, and the high proportion of pollution sources was found in the order of Landfill, Domestic, Livestock. As the result of this study, it is necessary to manage the pollutant loads occurred by the point source and baseflow in the Seomgang for water quality improvement in the South-Han river during dry season.