Evaluation of Non-Point Source Pollution Load Characteristics and Identifying Management Sub-Basin Area and Best Management Practices Using HSPF Model in Yongdam Dam Watershed

Objectives : To identify and estimate the non-point source (NPS) pollution loads in Yongdam watershed, to take an appropriate NPS management plan suitable for environmental conditions of sub-basin watershed.Methods The pollutant watershed was investigated establish hydrological simulation program-fortran (HSPF) model study area so that characteristics runoff were simulated. Furthermore, detailed catchment subject selected effect reducing examined based on various results.Results Discussion three sub-basins, including specific component catchments, according load intensity distribution pollution. result analyzing flowing into downstream by rainfall revealed accounted 11.8~19.9% dry season, Jinan-cheon high range 10~30 mm while Janggye-cheon junction showed a 30~60 mm. In addition, duration curve (LDC) excess frequency BOD when flow rate increased at end stream each sub-basin, whereas T-P entire range. LDC analysis led us water quality affected point pollutants complex way. When ground cover farm installed selecting 10 catchments with need management, reduction estimated be reduced 325.256~995.912 g/d 1279.813~3327.513 1316.831~3555.443 sub-basin.Conclusion Through experiments using HSPF model, it feasible select control detail evaluate