Wolong Longtan Power Station floods over the dam. What are the methods to eliminate the danger of the power station?

In the early morning of August 20, heavy rains in the Wolong area of ??Sichuan caused flash floods and debris flows. The floodgates of the Longtan Hydropower Station in Wolong, Sichuan could not be opened, and there was a danger of flooding over the dam. At present, the local people are organizing emergency evacuation for people along both sides of the river. According to CCTV News Weibo on August 21, as of 13:00 on the 21st, 96 people and tourists were trapped in the area above Longtan Power Station in Wolong Special Economic Zone, and 8 people were missing.

On the afternoon of August 21, The Paper learned from the Sichuan Fire Rescue Corps that rescuers were near the hydropower station and rescued 70 people, 17 of whom had been transferred by helicopter.

On the evening of August 21, The Paper learned from the Ministry of Water Resources that according to on-site inspections by the working group of the Sichuan Provincial Water Resources Department of the Ministry of Water Resources and personnel from the power station on the morning of the 21st, the water level of the hydropower station was about 1,641 meters, which was about 1,641 meters higher than the top of the embankment. 4 meters, which exceeds the design stable working condition of the dam, and the possibility of instability and collapse of the dam cannot be ruled out.

Longtan Hydropower Station is located in Gengda Town, Wolong Special Zone, Wenchuan, Sichuan. It is a fourth-level power station on the main stream of Yuzi River, a first-level tributary of the Minjiang River, and belongs to Shenhua Sichuan Energy Company.

The installed power station has an installed capacity of 24MW. The dam is a concrete dam with a dam crest elevation of 1,637.3 meters and a dam height of 20.35 meters. The normal water storage level is 1,636 meters. The total reservoir capacity is 379,600 square meters. It is a It is a diversion power station with daily adjustment function. On June 12, 1996, all three units were put into operation to generate electricity. In 2008, the 5.12 earthquake caused serious damage to the power station equipment and facilities. After four and a half years of post-disaster reconstruction, all three units were put into operation for the second time on January 1, 2013.

Heavy rainstorms on August 20 caused flash floods and mudslides. Due to power outages, the floodgates could not be opened normally, causing floods to overflow the dam. If the danger is not eliminated in time, there is a risk of dam collapse.

After on-site discussions between the working group, the hydropower station, and local government departments, it was proposed to carry out monitoring and prevention, personnel transfer, restoration of communication and transportation, downstream protection of the dam and road protection, and dam safety and stability assessment. Depending on the situation, measures such as opening or demolishing the gate, or setting up a temporary release channel on the left bank will be taken.