This study aims to investigate the variation of water quality and discharge under the condition of climate change and Best Management
Practices (BMPs), which is one of the reduction methods for non-point source pollution. Soil and Water Assessment Tool (SWAT)
model is applied to case in Cheongmicheon watershed. The coefficients required for SWAT model were calibrated using SWAT
Calibration and Uncertainty Program. Climate change is considered by using Representative Concentration Pathway (RCP) scenarios,
RCP 4.5 and RCP 8.5. It is known from simulation results that the non-point source pollutant increases under the climate change scenario
assuming worse condition. It is also found in this study that an appropriate application of BMPs is able to reduce the quantity and
temporal variation of non-point source pollutant effectively.