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Pollutants Removal Efficiency of Rainfall-runoff from Dense Highland Field Areas in Multistage Sedimentation Basins – Focused on Jaun Area in Upstream Watershed of Lake Soyang –

  • Journal of Environmental Impact Assessment
  • Abbr : J EIA
  • 2018, 27(2), pp.170-180
  • Publisher : Korean Society Of Environmental Impact Assessment
  • Research Area : Engineering > Environmental Engineering

CHO JAE HEON 1

1가톨릭관동대학교

Accredited

ABSTRACT

Highland fields are concentrated in the Jaun area of Hongcheong-gun, a large amount of sediments are discharged from the highland fields. The sediment runoff affect the turbidity and water quality of the Soyang Lake, furthermore adversely affect water supply source of the capital region. There are several kinds of BMPs(Best management practices) to decrease the sediment runoff from the highland fields. Although construction cost of multistage sedimentation basins is very high, there is no actual survey data for the removal efficiency of suspended sediments and water quality in our country. In this study, stormwater inflow and outflow of the multistage sedimentation basins were surveyed, and the removal efficiency of nonpoint source pollutants were analyzed. The stormwater survey results for two rainfall events show that removal efficiencies of SS, BOD and TP loads in the multistage sedimentation basins are 35%~62%, 24%~55%, 35%~58%, respectively. Although the measured efficiencies of the basins were lower than the theoretical efficiency, the proper operation and management can improve the removal rate of the basins. Turbid water problem in the upper parts of the Soyang River can be managed effectively through the additional installation of multistage sedimentation basins.

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This paper was written with support from the National Research Foundation of Korea.
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