Abstract
This study was performed to improve the water quality of the streams Yeongsan, Manbong and Pyeongdong, which are the first tributaries of Yeongsan river. However, the results of this study showed that maximizing the improvement of water quality by constructing the facilities of pollutant removal would not be big in effect, that is, BOD and T-P concentrations were reduced by 8.6% and 15.9%, respectively for Yeongsan stream, 8.3% and 7.1%, respectively for Manbong stream, and 7.7% and 23.2%, respectively for Pyeongdong stream. The reason why it was hard to improve water quality by facilitycentered structural reduction plan was because of water pollutants that were discharged from the organic wastes illegally dumped or left alone on non-specific time and unspecified places (open storage places for compost, livestock manure sheds, illegal dumping sites of agricultural wastes, agricultural drainage, etc.). As a method for solving this problem, this study showed that it would be appropriate to apply governance-centered unstructural plans (private-public consultative group), not the facility-centered structural plans initiated by government to reduce the amount of unspecified pollutants, and thus a governance structure that could be used for improvement of water quality was also suggested.
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