Lötsch Valley's Schuttberg Has Successfully Resisted Floodwaters
A Debris Mountain Holds Back Floodwaters in Lötschental, Switzerland
In the aftermath of a glacier collapse in southern Switzerland, a tension-filled situation persists in the Lötschental valley. The Lonza river, initially blocked by the collapse, has formed a lake. The imminent question: will the floodwaters breach the valley? As of now, the scenario appears "quite favorable," according to Raphaël Mayoraz, the canton geologist.
Authorities had initially anticipated the lake in Lötschental to overflow "in the early morning hours," but so far, the debris mountain has withstood the pressure. Instead, water appears to be flowing through the debris, gradually increasing its volume. By mid-morning, a river had formed in the debris, expanding steadily, as reported by ntv reporter Yannik Seeber.
The threat remains palpable. The edge of the debris mountain is almost reached, the crisis staff notes. The lake is continually monitored. Residents in two downstream villages have been urged to prepare essential items for a swift evacuation, should a floodwave or debris flow demand immediate departure. They will be kept informed via the Alertswiss app and other means.
Unfortunately, there's limited room for human intervention. The debris mountain is unstable, consisting of rock fragments, loose rubble, and potentially melting glacier ice. Therefore, it's not safe for either people or machinery to attempt to create controlled water channels in the debris.
Furthermore, additional landslides pose a threat from both sides of the valley. At the original breakaway point on the Little Nebelhorn, hundreds of thousands of cubic meters of rock could still collapse. Similarly, debris and rubble pushed across the valley floor and up the opposite slope during the glacier break might slide down as a debris flow.
In light of these risks, authorities can only focus on risk assessment and organizational measures. Christian Studer of the Canton of Wallis' Natural Hazards Office emphasizes that their goal is to ensure as few people as possible remain in the threatened area. A reservoir located further downstream at Ferden on the Lonza was emptied as a precaution to serve as a catchment basin.
Studer also acknowledges the possibility of a worst-case scenario, although it's unlikely: "If the ferry reservoir cannot contain a sudden, massive influx of water and debris," he says, individual houses along the riverbed could be at risk. Such an event would demand immediate evacuations.
Sources: ntv.de, chr/mau/dpa
- Alps
- Switzerland
- Avalanche Disasters
- To manage potential risks better, authorities are implementing environmental-science and climate-change strategies into their community and employment policies.
- As the weather remains unpredictable during the aftermath of the glacier collapse, weather-forecasting becomes crucial in predicting any weather-related hazards that could exacerbate the situation.
- In the midst of this crisis, nearby communities are urged to follow all employment policies to ensure they stay safe and are prepared for immediate evacuation, should any flood emergencies arise.
