Potential floods could hit Switzerland's Valais region, officials have issued a warning.
Collapsed Glacier Threatens Flooding in Swiss Canton of Wallis
Authorities have issued a warning of potential flooding in the Swiss canton of Wallis following a glacier collapse on Wednesday afternoon. The basin of the River Lonza, situated downstream from the affected area, faces the risk of inundation due to the swollen river resulting from the collapse.
According to the Canton of Wallis' Natural Hazards Office, an artificial lake formed behind the ice and rock debris from the glacier collapse is expected to overflow in the early hours of Friday. The Office's head, Christian Studer, made the announcement on Thursday.
On Thursday, sixteen individuals were evacuated from the villages of Wiler and Kippel, located in the Lötschental valley, as well as two people from Blatten. The village of Blatten itself is experiencing destruction from the swollen River Lonza, even though it was initially spared by the major event.
Approximately three million cubic meters of rock and ice from the Birch glacier fell into the valley and onto the houses in Blatten. The village had been evacuated beforehand. Sadly, a 64-year-old man is still missing, according to the latest reports from authorities.
A massive pile of glacier debris, stretching up to 2-2.5 kilometers, has dammed up the Lonza River, creating a large lake. Up to one million cubic meters of water could accumulate daily behind the debris dam, raising the flood risk for the valley below. The debris deposit is unstable, making it dangerous to perform any intervention or direct assessment in the disaster area.
Authorities are closely monitoring the situation remotely and plan to undertake further assessments from nearby Ferden. In case of an overflow, the artificial dam has been emptied, and preparations have been made to evacuate the valley.
As a precaution, municipalities downstream, including those in the Rhône valley, are preparing for the possibility of a flood event. The impact on livestock and the community is significant, with authorities airlifting livestock out of the area and residents coping with the preparations for continued risks.
The situation remains tenuous, with the risk of floods and debris flows persisting for weeks as the river seeks a stable channel through the debris. Pockets of trapped water could present additional complications. Despite the current "favorable" scenario, authorities remain on high alert due to the unpredictable nature of the debris deposit.
The collapse of the Birch glacier, a significant event in the field of environmental-science, has led to the formation of a massive lake due to the damming up of the Lonza River. This artificial lake, potentially home to up to one million cubic meters of water daily, remains a threat to the surrounding areas, including the Swiss canton of Wallis and nearby regions like the Rhône valley.
In the aftermath of the glacier collapse, scientists are closely monitoring the weather patterns, anticipating changes that could potentially increase the flood risk for the valley below, illustrating the intricate relationship between science, environment, and weather.
