What are the options to drain the two lakes in Nepal that are exacerbating the flood risks?

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If you mean the two newly formed lakes in Nepal’s Rasuwa/Lhende river area after the August 2026 glacier-collapse disaster, they are not ordinary lakes that can simply be “drained.”  When rock, ice, mud, and landslide debris obstructed natural river drainage, they became temporary barrier lakes. One has already started draining, while the larger lake has been reported as growing and without a clear outlet.

 Strategies for lessening or eliminating the danger: Controlled breaching of the natural dam

 Engineers could carefully cut a channel through the debris barrier so water escapes gradually.

 This is potentially the fastest method, but it is extremely dangerous because an uncontrolled breach could produce another destructive flash flood.

 Experts quoted by Al Jazeera said controlled breaching could be considered, but the steep and complex terrain makes it difficult.

 Create a controlled outlet/channel

 Engineers could either excavate or reinforce a smaller drainage channel rather than abruptly removing the entire barrier. The objective would be to lower the lake progressively and prevent a sudden collapse.

 Pumping or siphoning

 Water could theoretically be removed by large siphons or pumps. However, gravity drainage is much more practical than gravity drainage for a large, remote mountain lake because it would require transportation of equipment and sufficient power generation. Natural drainage with intensive monitoring

 If the barrier is already releasing water safely, the safest option may be to let it drain naturally while continuously measuring lake level, inflow and downstream river discharge.

 Satellite imagery, drones, cameras and water-level sensors can provide early warning.  Nepal has been planning additional cameras and sensors downstream, including around Timure.

 Emergency evacuation and early-warning systems

 If engineering intervention is too dangerous, protecting people downstream becomes the priority.

 Real-time sensors, satellite monitoring, sirens and rapid evacuation plans could give communities warning if the natural dam begins to fail.

 What would probably be safest?

 Do not simply “break the dam.”  The best engineering strategy would normally be to first map the lake and debris barrier, calculate the potential flood volume, and then determine whether a controlled drainage channel can safely lower the water.  Because the site is remote, steep, and unstable, experts have warned that direct engineering intervention may itself be extremely difficult.

 The current situation is particularly serious because the lakes are upstream of river systems leading toward the Bhotekoshi and Trishuli, so a sudden outburst could send another debris-laden flood downstream.


   Writer: Binod Kumar Simkhada 
binodkumarsimkhada315@gmail.com

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