Development of BMPs for management of NPS from railway bridges

The railway is regarded as a future-oriented transportation system, because railway has advantages of environment, economic and operation. However, in Korea, the water pollution caused by non-point pollutant source from railway industry has not been considered yet. The goal of this research was development of best management practice (BMP) based on runoff characteristics and pollutant load from railway industrial area focused railway bridges. So, rainfall monitoring was conducted at two railway bridges (concrete road-bed railway bridge and gravel road-bed railway bridge) during 3 years. The major runoff characteristics in concrete road-bed railway bridge were first flush effect and high pollutant load of heavy metals and oil and grease (O&G). In gravel road-bed railway bridge, twopeaks and high pollutant load of heavy metals and O&G were major runoff characteristics. The BMPs for railway bridge were developed based on results of rainfall monitoring. The removal efficiency of BMPs was higher than different type of BMPs such as screen, filtration, vortex and mixed including of heavy metals O&G. Thus, it would be appropriate for management of NPS from railway bridges that the developed BMPs in this research.