Anticipated Dam Rupture in Early Morning Hours in Switzerland
In the Loetschental valley, south of Switzerland, preparations for a potential dam burst are underway following the collapse of the Birch Glacier and subsequent formation of a lake. The severity of the dam burst is uncertain, as the authorities await the water's release into the valley.
A glacier collapse on Wednesday resulted in a massive debris pile, blocking the River Lonza and causing the formation of a lake. The water level in the reservoir rose at times by three meters per hour, exacerbating concerns about the impending burst.
The authorities in the Canton of Wallis expect the artificial lake to overflow "in the early morning hours." However, it remains unclear whether this will occur in a controlled or chaotic manner. The debris pile, consisting of rock fragments, loose debris, and potentially melted glacier ice, poses a significant risk of sudden and unpredictable debris flows leading to severe flooding downstream.
Unfortunately, the situation is such that "we can do little as an organization because the safety situation on site does not allow us to intervene with heavy machinery," according to Christian Studer of the Canton of Wallis' Natural Hazards Office. Further landslides are also threatened from both sides of the valley, involving several hundred thousand cubic meters of rock at the original collapse site and debris and rock masses downstream, which could slide down as a debris avalanche again.
Authorities are currently engaged in risk assessment, organizational measures, and evacuation planning for villages downstream. A reservoir located further downstream at Ferden on the Lonza has been cautiously emptied to serve as a retention basin. The worst-case scenario, though unlikely, involves much more water and debris coming, potentially overwhelming the Ferden reservoir.
With careful monitoring and proactive measures by authorities, the risks associated with the dammed lake in the Loetschental valley are being managed, albeit tentatively. The potential for widespread destruction due to debris flows, flooding, or a catastrophic dam burst remains high, emphasizing the gravity of the situation and the importance of continued vigilance.
Source: ntv.de, mau/dpa
- Alps
- Switzerland
- Avalanche Accidents
- In light of the unpredictable debris flows and potential catastrophic dam burst in the Loetschental valley, it is crucial that the community adopts a comprehensive policy addressing emergency response, evacuation, and recovery, considering the implications of climate-change on weather patterns and environmental-science.
- To mitigate the risks associated with the dammed lake, it would be essential to include employment policies for scientists and experts in the fields of environmental-science and climate-change, who could aid in monitoring, predicting, and managing potential disasters more effectively, ultimately safeguarding the community and the Alps' ecosystem.
