Glacial Lake Outburst Floods Threaten Chenab Valley Power Projects

SRINAGAR: A comprehensive risk assessment plan for Kishtwar district has warned that major hydroelectric projects in the region face high risk from Glacial Lake Outburst Floods (GLOF) triggered by rapid glacial retreat and lake expansion.

A copy of a report prepared by District Disaster Management Authority (DDMA) Kishtwar states, “Major projects under Chenab Valley Power Projects Limited (CVPPL) — including Pakal Dul, Kiru, Kwar, and Dangduru — are vulnerable to potential GLOF events.”

The report notes that rising water levels or a breach of glacial dams could severely damage power infrastructure, disrupt operations, and increase the risk of flooding downstream. It also warns that GLOFs could wash away vital road links, hampering evacuation and relief efforts, and isolating entire communities.

Beyond infrastructure, the environmental stakes are high. The Kishtwar High Altitude National Park, home to rare flora and fauna, faces ecosystem disruption, habitat loss, and biodiversity decline if such disasters occur.

The DDMA has urged proactive measures, including continuous monitoring of glacial lakes, strengthening of disaster preparedness, and integrating climate risk assessments into developmental planning. The GLOF Management Plan emphasises early warning systems, community preparedness, and infrastructural resilience.

Communities Downstream in Peril

The report underlines that the Kishtwar Himalayas have witnessed significant glacial lake expansion in recent decades due to global warming. Newly formed lakes, held behind unstable moraine dams, are highly vulnerable to collapse under stress from seismic activity, heavy rainfall, or further melting.

“This expansion not only increases the risk of GLOFs but also underscores the urgent need for regular monitoring and risk mitigation strategies to protect downstream populations,” the report says.

The tehsils of Padder, Machail, Dachhan, Marwah, and Warwan are flagged as highly vulnerable. Marwah and Warwan, labelled “Shadow Areas” for their remoteness, house low-lying settlements where poor connectivity and weak disaster preparedness heighten the threat.

Mundiksar Lake Expansion

The report points to a dramatic expansion of Mundiksar Lake over the past four decades, identifying it and Hangu Lake as high-risk sites. Patla Pani Lake is classified as moderate-risk but remains susceptible to dam breach.

With Kishtwar lying in seismic Zone IV, earthquakes and landslides are a further trigger. Landslides can displace massive water volumes, causing lake overtopping and catastrophic floods.

Chenab River Under Strain

The Chenab River, fed by glaciers and glacial lakes, is “highly sensitive” to hydrological changes, the report warns. Any sudden outflow could alter its course, flooding surrounding areas.

Need for Mitigation and Monitoring

The DDMA has stressed the urgency of a multi-layered mitigation strategy, including satellite-based monitoring, installation of sensors, controlled drainage of high-risk lakes, and reinforcement of moraine dams. Early Warning Systems in collaboration with the Indian Meteorological Department, coupled with community awareness campaigns, are seen as critical.

“Local populations must be trained to recognise the warning signs of GLOFs, evacuation procedures, and response measures,” the report states, adding that risk mapping and identification of buffer zones are essential for safeguarding life and infrastructure. (KNO)