The Forestry and Nature Conservation Agency said Friday that a barrier lake upstream of the Wanli River is no longer at risk of overflow [1].
The clearing of this risk reduces the immediate threat of sudden flooding or debris flows that often follow the breach of natural dams in mountainous regions. Such events can cause significant damage to downstream infrastructure and residential areas.
According to the agency, current measurements show the water level of the barrier lake is 17.77m below the overflow point [1]. This margin provides a substantial buffer against sudden rises in water levels, provided weather conditions remain stable.
Monitoring teams have assessed the current state of the upstream area. The agency said that the lake is predicted not to overflow within the next 10 days, assuming there is no significant rainfall during that period [1].
Natural barrier lakes typically form when landslides or debris block a river's flow, creating a temporary reservoir. If these lakes overflow or collapse, they can release massive volumes of water and sediment, a process that can be catastrophic for local ecosystems and human settlements.
The agency continues to monitor the Wanli River upstream to ensure the stability of the site [1].
“The barrier lake upstream of the Wanli River is no longer at risk of overflow.”
The stabilization of the Wanli River barrier lake indicates a temporary reprieve from landslide-induced flooding risks. While the current water level is well below the danger threshold, the agency's reliance on a 10-day weather forecast suggests that the site remains sensitive to heavy precipitation, which could rapidly refill the reservoir and reintroduce the risk of a breach.
