Assessing the Action Plans in the Control Area(Soyang Reservoir) of Non-point Source Pollution

비점오염원 관리지역(소양호) 목표수질 달성도 평가

  • Choi, Jaewan (National Institute of Environmental Research) ;
  • Kang, Min-Ji (National Institute of Environmental Research) ;
  • Ryu, Jichul (National Institute of Environmental Research) ;
  • Kim, Dong-Il (National Institute of Environmental Research) ;
  • Lim, Kyung-Jae (Department of Regional Infrastructure Engineering, Kangwon National University) ;
  • Shin, Dong-Seok (National Institute of Environmental Research)
  • 최재완 (국립환경과학원 수질총량연구과) ;
  • 강민지 (국립환경과학원 수질총량연구과) ;
  • 류지철 (국립환경과학원 수질총량연구과) ;
  • 김동일 (국립환경과학원 수질총량연구과) ;
  • 임경재 (강원대학교 지역건설공학과) ;
  • 신동석 (국립환경과학원 수질총량연구과)
  • Received : 2013.06.19
  • Accepted : 2014.03.11
  • Published : 2014.05.30


The Ministry of Environment (MOE) has made more effort in managing point source pollution rather than in nonpoint source pollution in order to improve water quality of the four major rivers. However, it would be difficult to meet water quality targets solely by managing the point source pollution. As a result of the comprehensive measures established in 2004 under the leadership of the Prime Minister's Office, a variety of policies such as the designation of control areas to manage nonpoint source pollution are now in place. Various action plans to manage nonpoint source pollution have been implemented in the Soyang-dam watershed as one of the control areas designed in 2007. However, there are no tools to comprehensively assess the effectiveness of the action plans. Therefore, this study would assess the action plans (especially, BMPs) designed to manage Soyang-dam watershed with the WinHSPF and the CE-QUAL-W2. To this end, we simulated the rainfall-runoff and the water quality (SS) of the watershed and the reservoir after conducting model calibration and the model validation. As the results of the calibration for the WinHSPF, the determination coefficient ($R^2$) for the flow (Q, $m^3/s$) was 0.87 and the $R^2$ for the SS was 0.78. As the results of the validation, the former was 0.78 and the latter was 0.67. The results seem to be acceptable. Similarly, the calibration results of the CE-QUAL-W2 showed that the RMSE for the water level was 1.08 and the RMSE for the SS was 1.11. The validation results(RMSE) of the water level was 1.86 and the SS was 1.86. Based on the daily simulation results, the water quality target (turbidity 50 NTU) was not exceeded for 2009~2011, as results of maximum turbidity in '09, '10, and '11 were 3.1, 2.5, 5.6 NTU, respectively. The maximum turbidity in the years with the maximum, the minimum, and the average of yearly precipitation (1982~2011) were 15.5, 7.8, and 9.0, respectively, and therefore the water quality target was satisfied. It was discharged high turbidity at Inbuk, Gaa, Naerin, Gwidun, Woogak, Jeongja watershed resulting of the maximum turbidity by sub-basins in 3years(2009~2011). The results indicated that the water quality target for the nonpoint source pollution management should be changed and management area should be adjusted and reduced.


CE-QUAL-W2;HSPF;Nonpoint source pollutant;SS;Turbidity


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