Lam Dong: Subsidence in Dak Fur Thuong irrigation reservoir

In the past few days, in the area of ​​Dak Fur Thuong irrigation lake (Loc Ngai commune, Bao Lam district, Lam Dong province), there has been a very serious subsidence situation that makes people in the area uneasy and worried.

On November 23, observing at the scene, it was obvious that a prolonged subsidence cut across the coffee garden of Mr. Vu Minh Thuoc's family and Ms. Nguyen Thi Tiem (living in Village 13, Loc Ngai commune, Bao Lam) . The total length of the subsidence line is 200m, the surface width is from 10-20cm, the section with the deepest settlement is 10m.

Ms. Nguyen Thi Tiem said, since the new family discovered, after every night this subsidence phenomenon is very clear, some days after only one night the land has dropped to 1-2m. In the days of heavy rain, the family of Niem had to stay and stay with her relatives for a whole week before going home.

In addition to a 200m long arc subsidence line, in the area of ​​coffee growing land of Ms. Tiem's ​​family (about 5,000m2 wide), dozens of cracks and subsidence appeared. These subsidence has a surface width of 5-50cm, 1-2m deep and runs across the coffee garden. Meanwhile, the bottom of the foothills in the subsidence area also appears to be soiled with an area of ​​about 60m2 and many water leak points.

Dak Fur Thuong irrigation lake

According to observation, the subsidence area is about 250m from the heart of Dak Fur Thuong irrigation reservoir in the Northwest direction, downstream of the reservoir.

Regarding this issue, recently, Lam Dong province organized an interdisciplinary inspection team including Department of Science and Technology, Department of Natural Resources and Environment, Department of Agriculture and Rural Development . to present the survey. school

According to the initial assessment of the inspection team, the cause of this situation is the time when subsidence appeared on the occasion of the storm No. 7 landed, it rained a lot. Therefore, the soil emergence and subsidence in the above area is due to the lower part of the area containing a lot of water, when the water pressure drops downwards, causing soil emergence and subsidence. In addition to the above subsidence area, the surrounding structures such as managers, clusters of construction works and management roads on the lake do not see abnormal phenomena.

According to the authorities, in the coming time, the phenomenon of subsidence can still continue, especially in the rainy season, can cause landslides of the entire hillside above, causing damage to people and property. . Therefore, the interdisciplinary inspection team proposed that the Provincial People's Committee instruct the Bao Lam District People's Committee to have a plan to relocate Ms. Nguyen Thi Tiem out of the area and the government of Loc Ngai commune must set up a sea. warning and prohibiting people from entering the area when there is heavy rain.

The Lam Dong Center for Investment and Exploitation of Irrigation needs to regularly monitor and report on unusual phenomena for the works of Dak Hai Thuong irrigation reservoir.

The People's Committee of Lam Dong province should direct the specialized agency to invite scientists and experts to survey and study to find out the cause and propose a plan to overcome the above characteristics.

Dak Fur Thuong reservoir is put into use in 2011 with the task of supplying water for 3,076ha of industrial crops and supplying domestic water for 3,000 households in the area. Dak Fur Thuong reservoir has a total capacity of over 11 million m3, the catchment area is 14.3 km ² . This project is invested by Project Management Board 8 (Ministry of Agriculture and Rural Development), built in 2006-2010 and now assigned to the Center for Investment Management and Irrigation Exploitation. Lam Dong manages and exploits.