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(Received: 17 September 2014, Revised: 07 Janurary 2015, Accept ed: 13 August 2015)         .         .     ,         .           .             .               .          ,       .    Braun-Blanquet()    ,           .    pearson    .       ,      .: , , , , , AbstractRecently the water quality management policy gives priority to management the point source. Point pollution sources have definite emission points and are discharged to one point throug h a pipe. But Nonpoint pollution source (NPS) has uncertain pathway, pollutant load and runoff characteristics unlike point pollution sources, making them difficult to manage. Thus, the Korea government plans to develop and equip facilities that help reduce NPS so as to manage them more easily. But removal efficiency of Best Management Practice (BMPs) is in influenced by rainfall, hydrologic condition like natural phenomenon, so factors of removal efficiency are difficult. Thus there is a need for multilateral research about many factors that affect removal efficiency for removal facility design of proper non-point pollution. In this research, mapping, vegetatio n coverage and retention time were investigated in the case of factors that affect removal efficiency in grassed swale, a nature-type non-point removal facility. Grassed swale obtained changed of coverage using Braun-Blanquet within swale and retention time was obtained from point that rainfall effluent enters into swale to the time that first outflow starts. Besides, correlation analysis was obtained using pearson correlation analysis method. As a result, it was shown that removal efficiency increases as retention time is longer in grassed swale and that retention time increases as vegetation coverage is higher. Key words:Non-point pollution source, BMPs, Grassed Swale, Removal Efficiency, Retention Time, Vegetation Coverage

Analysis of Factors Affecting Retention Time in Grassed Swale