The Overlooked Flood Risk: Decaying Early Warning System on Everest

Sat Apr 25 2026 03:32:12 GMT+0000 (Coordinated Universal Time)

Thousands in the Everest region face an elevated flood risk as an early warning system, funded by millions, becomes obsolete, leaving communities vulnerable.

The early flood warning system in the Everest region, designed to protect thousands from potential glacial lake floods, is neglected and deteriorating. Local officials admit that years of disrepair have compromised the effectiveness of the system. Villagers express their fear and frustration, citing unmaintained sirens and unreliable satellite data, highlighting a growing danger as climate change exacerbates glacial lake risks. With a history of glacial lake floods, locals demand urgent action to address the failing warning infrastructure.

An early flood warning system designed to save the lives of thousands of people in the Everest region may no longer be working, Nepalese officials have admitted to the BBC, after it was allowed to fall into a state of disrepair. The disclosure came after villagers in the local Sherpa communities told the BBC no inspection of the UN-supported project had been carried out for many years after the dangerous Imja glacial lake was last drained in 2016.

Since then, no maintenance has been undertaken, which means siren towers have been left to rust, while some have even had their batteries stolen, according to locals. On top of this, the satellite data reception transmitting the lake's water level, which can then be used to send out mobile phone alerts to locals, has been unreliable, officials at Nepal's department of hydrology and meteorology (DHM) confirmed.

The Imja lake, which sits at a little over 5,000m (16,400ft) above sea level, has not burst since it was drained a decade ago - at which point, it was almost 150m deep in places. Back then, the depth of the lake was reduced by about 3.5m as part of a $3.5m risk reduction project, which included the early warning system.

However, scientists warn global warming-induced fast melting glaciers are causing many Himalayan glacial lakes to expand dangerously - meaning they can then burst out and sweep away downstream settlements, trekking routes, and bridges.

Ice loss rates have doubled in the Hindu Kush Himalaya region since 2000, according to a recent assessment by the Kathmandu-based International Centre for Integrated Mountain Development. Experts state that rising temperatures have also left mountains less stable, unleashing rockfalls and glacial collapse that can sometimes trigger catastrophic floods.

In the Everest region alone, there have been at least five floods from glacial lakes in the last five decades. Going by the state of the siren towers, we don't expect to get any flood warning from them even when Imja lake bursts, said Ang Nuru Sherpa, chairman of the Chaurikharka buffer zone area adjoining Sagarmatha National Park. Villagers like Jangbu Sherpa express their frustration that officials have not inspected the siren system for years, despite initial promises.

Local NGO representatives are also concerned, pointing out that over 60,000 tourists visit the region annually, in addition to local populations, all of whom are at risk should the lake's conditions worsen. The DHM acknowledges a lack of budget and insufficient maintenance resources as barriers to ensuring safety for the region. Furthermore, additional funds from the UNDP have been redirected to other projects, leaving the early warning system for Imja lake in disrepair.

As the climate crisis deepens, the neglect of vital infrastructure underscores a growing threat to local communities in the shadow of Everest.