<Figure 3-5> to <Figure 3-7> show water quality trends in the major rivers of Korea: Han River, Nakdong R., Geum R., and Yeongsan R. Biochemical oxygen demand (BOD) in public waters is generally being improved as a result of intensive policy efforts such as the Comprehensive Plan on Water Management 1996, Comprehensive Plan on Water Management in the Four Major Rivers (1998-2005), and Master Plan for Water Environment Management (2006-2015). Chemical oxygen demand (COD), however, has increased or has not improved as much as BOD due to the more use of chemical substances and inflow of non-biodegradable organic contaminants from NPS. It shows overall decrease of total phosphorus (T-P), the main cause of algal blooms.
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Last modified : 2016-11-03 22:58
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