Context:

• The staggering collapse of part of a glacier in Uttarakhand’s Nanda Devi mountain and the ensuing floods that have claimed many lives come as a deadly reminder that this fragile, geologically dynamic region can never be taken for granted.

Background:

• A significant slice of the glacier, dislodged by a landslide, according to some satellite images, produced roaring torrents in the Rishiganga and Dhauliganga rivers in Chamoli district.
• Scores of people are still missing in the wave of water, silt and debris that swamped the rivers and filled tunnels in the Tapovan power project, although the immediate rescue of nearly 15 people by the ITBP, the Army and other agencies brings some cheer.
• The rescuers face a challenging environment as they try to locate more survivors and bring relief supplies to paralysed communities.

Concerns:

• The Centre and the Uttarakhand government cannot ignore the larger context of the State’s increasing frailty in the face of environmental shocks.
• Once the crucible of environmentalism, epitomised by Sunderlal Bahuguna, Gaura Devi and the Chipko movement, the State’s deep gorges and canyons have attracted many hydroelectric projects and dams, with little concern for earthquake risk.
• Red flags have been raised repeatedly, particularly after the moderate quake in 1991 in the region where the Tehri dam was built and the 2013 floods that devastated Kedarnath, pointing to the threat from seismicity, dam-induced microseismicity, landslides and floods from a variety of causes, including unstable glacial lakes and climate change.
• Researchers say, overdependence on hydropower in Himalayan region comes with huge risks including potential earthquake impacts, monsoonal aberrations that could repeat a Kedarnath-like flood, severe biodiversity loss and, importantly, extreme danger to communities downstream.
• There is also some evidence that the life of dams is often exaggerated, and siltation, which reduces it, is grossly underestimated.

Conclusion:

The need is to rigorously study the impact of policy on the Himalayas and confine hydro projects to those with the least impact, while relying more on low impact run-of-the-river power projects that need no destructive large dams and reservoirs.

https://www.thehindu.com/todays-paper/tp-opinion/troubled-mountains/article33787078.ece

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