In this study, the characteristics of non-point source pollution runoff and the possibility of using new unit load were
investigated by using pollutant load based on monitoring data considering baseflow. For this purpose, the components
of hydrograph were separated by using digital filter method and the numerical integration method was applied to
calculate the non-point source pollutant load for nine rainfall events in Juwon river in the Geum River basin. As a
result of this study, the mean contribution rate of non-point pollutant was 31.34% for BOD, 58.94% for T-N, and
50.42% for T-P and BOD was more influenced by baseflow pollutant. Also, it was analyzed the pollutant load using
the new unit load is closer to the observation load than the old unit load. This result implies that it is necessary to
manage not only pollutant load due to direct runoff but also pollutant load due to baseflow runoff for efficient water
quality management of the watershed.