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In this study, the Better Assessment Science Integrating point and Nonpoint Sources (BASINS 3.0)/ Window interface to Hydrological Simulation Program-FORTRAN (WinHSPF) was applied for assessment of North Han River watershed. WinHSPF calibration was performed using monitoring data from 2003 to 2005 to simulate stream flow. Calibration results were reasonably matched with observed data in stream flow. Some errors in the model results were caused by the lack of measured watershed data, hydraulic structure data and meterological data.
The purpose of this study is the introduction of pollutant loads's estimation into Saemangeum watershed area with M.E.'s guidebook for TMDL and GIS tool. To estimate reliable pollutants loads, it is necessary to think about characteristic of removal, discharge and runoff as time series. In this study, it was calculated for generation loads which be came from pollutant source, discharge loads which be reduced in the treatment facilities and delivery loads which be considered the self purification parameter and delivery distance. To assess the delivery distance handily, it was particularly estimated using Arc-GIS. It was met with good results that delivery loads of BOD, T-N and T-P was reflected to seasonal precipitation. Lastly to verify the estimated pollutant loads, HSPF developed by USEPA was applied to it. It was showed a relativity of observed to simulated data for flow, Temperature, DO, BOD, NO<sub>3</sub><sup>-</sup>-N TN and TP. Consequantly, this delivery loads can make full use of model input data for prediction of pollutant loads.