A newly formed lake in the upper reaches of the Lehende Khola basin has triggered fresh flood concerns in Nepal and Bihar, after China warned that its banks could potentially breach.
The lake was formed after a landslide near the Tibet-Nepal border created a natural barrier following a flash flood earlier this week. Around 2.5 million cubic metres of water reportedly accumulated near the Lehende River. Since Friday, water has begun spilling into the Lehende Khola and eventually reaching the Trishuli River system.
China has alerted Nepal’s foreign ministry about the changing condition of the lake. Officials reportedly observed that the water has become increasingly dark, raising concerns about sediment accumulation and pressure on the natural barrier. Chinese authorities have warned that the lake could breach, although they have also indicated that the current volume of water is not large enough to cause a major rise in downstream river levels.
The development has nevertheless prompted heightened vigilance in Bihar, particularly along rivers connected to Nepal. Authorities have begun round-the-clock monitoring of river levels in vulnerable areas.
The Gandak river system is a particular concern because substantial flows from Nepal enter India through the Gandak barrage at Valmikinagar. Officials are closely watching the situation to assess whether any sudden increase in discharge could affect downstream districts.
China has estimated that the lake could accumulate another three million cubic metres of water within three days. Despite the relatively limited volume, authorities in downstream areas have been advised to remain alert.
For Bihar, the immediate risk remains uncertain, but officials are maintaining close surveillance as a precaution against any sudden change in the Himalayan water system.
