Review on Water Quality and Achievement of Water Quality Goal by Various Evaluation Methods in Geum River

다양한 평가기법을 이용한 금강 대권역의 수질 및 목표수질기준 달성도 평가

  • Lee, Jae-Woon (Geum River Environment Research Center, National Institute of Environmental Research, Ministry of Environment) ;
  • Jeong, Hye-Sung (Geum River Environment Research Center, National Institute of Environmental Research, Ministry of Environment) ;
  • Yoon, Jung-Hee (Geum River Environment Research Center, National Institute of Environmental Research, Ministry of Environment) ;
  • Cheon, Se-Uk (Geum River Environment Research Center, National Institute of Environmental Research, Ministry of Environment)
  • 이재운 (환경부 국립환경과학원 금강물환경연구소) ;
  • 정혜성 (환경부 국립환경과학원 금강물환경연구소) ;
  • 윤정희 (환경부 국립환경과학원 금강물환경연구소) ;
  • 천세억 (환경부 국립환경과학원 금강물환경연구소)
  • Received : 2008.07.17
  • Accepted : 2008.11.21
  • Published : 2008.12.01

Abstract

The Ministry of Environment plans to improve quality of water which is achieved over 85% in rivers and 94% in lakes of the whole country as "Good Water" until 2015. Also, the law of evaluation of water quality and water quality goal were made newly. So, the water quality has evaluated by using new law since 2007. This study evaluated whether "Good Water" and" Water Quality Goal" were achieved or not in 22 middle-sized districts and major 10 lakes of Geum river. The achievement rates of rivers decreased and the achievement rates of lakes mostly were the same for 5 years. In 2007, the achievement rates of "Good Water" were 50% in rivers and 50% in lakes. The achievement rate of "Water Quality Goal" were 59.1% in rivers and 20% in lakes. The water quality in 2007 was evaluated worse than last year in case of rivers. The evaluations of Korea-Comprehensive Water Quality Index(K-CWQI) showed that achievement rates of "Water Quality Goal" were 81.8% in rivers and 0% in lakes. The statistical correlation analysis showed that correlations between BOD and COD were meaningful at the downstream, compared to upstream, generally. In case of lakes, correlations between COD and temperature were meaningful. Also, correlations between COD and Chl-a were meaningful. The Trophic State Index ($TSI_{KO}$) showed that the half of lakes are major over eutrophic status in lakes. These analytical methods such as K-CWQI, $TSI_{KO}$, statistical correlation analysis could be additionally helpful for evaluation of water quality and provide basis data for understanding characteristics of watershed in Geum river.

Keywords

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