Best management practices (BMPs) were used to reduce the NPS in various fields. The Korean Ministry of Environment has developed a total maximum daily load (TMDL) and adapted it to prevent water resources from pollutants in four major rivers. However, many water bodies in Korea are still polluted. It is anticipated that the NPS pollution flows into the water bodies without treatment. Nowadays, BMPs are enforced to reduce the NPS pollutant in Korean TMDL.This paper analyzes the characteristics of the reduced pollution loads by two different BMPs. We also calculate the reduced pollutant mass and the reduced pollutant loading rate to help make a plan for the pollution reduction in the Korean TMDL.The characteristics of the pollutant reduction in the BMPs were revealed through analysis of the EMC, first flush phenomenon and reduced pollution loads. Integrated facilities which combined two facilities were more effective to reduce the pollutant than the single and it was better to remove the beginning of the runoff as a first flush effectively than treat all runoff in the facilities.

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