In order to establish the watershed water quality management strategy of Total Maximum Daily Load(TMDL), it is
necessary to understand the relationship between water quality component impacts, and to identify the impacts on
downstream target point of watershed water quality management of waste treatment plant(WTP) discharge and
upstream/tributary loads. In this study, we determined the impacts between the water quality contaminants, and
traced water pollution sources using monitoring data of ministry of environment in tributaries and main stream and
WTP monitoring data. Test area is set to Geumho river basin which has characteristics of urban and rural area and
composes of GeumhoA, GeumhoB, GeumhoC watershed units in TMDL. The clustering with five grades of discharge
data and the correlation analysis were performed through the FDC(Flow duration curve) analysis, which more clearly
identified the points and water contaminants deteriorating target water quality of downstream point. This can be used
as a tool for tracing pollutants with FDC analysis, and will help us establish the watershed water quality management
strategy for TMDL target point in watershed more effectively.