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summer, uninvited guests and green algae are spreading in Daecheong Lake, the source of drinking water in the Chungcheong region.

It is caused by rainwater, garbage, and heat waves that flowed in during the rainy season, and it is repeated every year, but there is no clear solution.

Reporter Lee Yong-shik covered the story.


This is the upstream of Daecheong Lake in Okcheon, North Chungcheong, where the water of the lake has lost its blue color.

The water surface, covered with light green algae, looks like it has released paint.

The condition gets worse as you go to the edge where the water flow is slow, so you can't see even an inch ahead in the water.

Only green algae grains are bubbly in the water that you have scooped up.

In Chusori, the top stream of Daecheong Lake, the monsoon rains ceased and the heat wave continues immediately, and green algae are rapidly spreading day by day.

The number of harmful blue-green algae cells measured on the 12th was 1,928 cells in 1 mL, more than doubled compared to a week ago.

This is because substances that cause algae, such as nitrogen and phosphorus, entered the lake along with garbage due to the heavy rain.

[Jeong Yong-moon / Deputy Manager of Korea Water Resources Corporation: We will do our best to protect the water quality of the water source by making good use of surface aeration (device), algae blocking screens, and algae removal facilities.] We

are also busy cleaning up the rainy season garbage that flows into the lake


I lost.

Dry grass and branches are mostly dry grass, but there is also a mix of household waste, which can worsen algae if not removed in time.

Daecheong Lake green algae is repeated every summer.

The Ministry of Environment has been collecting livestock manure for 4 years to prevent the inflow of substances that are green causative agents, but it is not having much effect.

It is pointed out that thorough investigation and meticulous measures are needed not only for livestock manure but also for pollutants from farmland, residential areas, and yards to reduce algae.

(Video coverage: Kang Yun-gu, Kim Min-cheol)