Many Korean lakes are artificially constructed by dams, and most of them are agricultural reservoirs. Lakes are very susceptible to eutrophication because they have lower self-purification capacity than rivers and nutrients can easily accumulate. Therefore, the prevention of eutrophication is the key object. Water quality targets and their milestone periods are set for 49 major lakes. The key measures or lake water quality management are as follows.

Lake Water Quality Survey

Lakes with a daily intake of at least 300,000 tons of water and those with a full water level area of 0.5km2 are regularly surveyed (every year or 3 years) for water use, water quality and aquatic environment, pollution sources, and pollution loads. Such fundamental information is used for the preparation of the lake water quality management policies.

Algal Bloom Prevention and Algae Alert System

In order to prevent the inflow of algae-causing nitrogen and phosphorus, the effluent standard for SWTPs has been tightened and the advanced treatment process has been expanded. Farming and fishing at water supply sources are restricted.

An algae alert system is operated to prevent the damage caused by the massive algal bloom. The system was implemented in 1998 at four lakes used as major water supply sources. and it was extend to the lakes with a high likelihood of algal bloom. The algae alert system is in operation in 22 lakes as of the end of 2013.

As the concerns algal bloom increases, a more organized, scientific response system is demanded. Therefore, a water quality forecasting system is newly introduced and the existing algae alert system for lakes is being tested for rivers that are used as water supply sources. (Details in Current Policy Focus. (4) Scientific Algal Bloom Response System)

Intensive Management of Selected Reservoirs

Reservoirs with a total capacity of 10 million m3 or more and those whose water quality grade exceeds Class III (Class IV for agricultural reservoirs) are designated as reservoirs for priority control. The associated laws were amended in 2012 to prepare and implement the water quality improvement measures. Accordingly, the designation of reservoirs for priority control and formulation of master plans have been in progress since 2013.

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Last modified : 2017-12-12 08:38

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