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HIMALAYAN DEVELOPMENT
VIMAL KHAWAS
Special Centre for the Study of North East India,
Jawaharlal Nehru University
Teesta Disaster: A Human-made Disaster
and the Lessons Learnt
The author, a specialist in disaster management in North East India, writes that
Sikkim should now concentrate on the efficient handling of the already
constructed and commissioned hydropower projects instead of venturing into new
ones. There should be proper human coordination and Early Warning System in
place to manage the functional dams. The inefficiency and lack of human
coordination to handle current flash floods in the upper Teesta catchment has
badly exposed Sikkim. A small mistake upstream will have a tremendous human
and environmental impact downstream. Sikkim needs to evolve comprehensive
regional hydropower policy in view of its unique regional environment, ecological
setup, and geography.
T
he Upper Teesta catchment areas of Sikkim and Darjeeling
Himalaya were ravaged by a Glacial Lake Outburst Flood (GLOF) on
the night of October 3 and 4, 2023 (reportedly between 10:30 p.m. and
3:00 a.m., respectively). The exact timeline of the flood from its source to
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VOLUME 4, ISSUE 1 (WINTER/SPRING) JANUARY TO APRIL 2024.
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VIMAL KHAWAS
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Sevoke in West Bengal is yet to be correctly established. The hazard
quickly turned into disaster, destroying human and animal lives,
including human-made infrastructure downstream.
The Lhonak Lake that burst out of its dam on October 3, 2023 is
one among many potentially dangerous glacial lakes in the Sikkim
Himalaya. The rapidly warming Himalaya has led to an acceleration of
various geomorphic processes, including melting of glaciers. The rapid
melting of glaciers has further given rise to many potentially
dangerous glacial lakes, in recent times. It has increased the intensity
and frequency of extreme climatic events like the GLOF in the
Himalaya. While GLOFs are not a new phenomenon across the
Himalaya, their occurrence has become more frequent and intense in
the past couple of decades.
Note: RISAT-1A is a radar imaging satellite of the Indian Space Research
Organisation, and Sentinel-1A is a European radar imaging satellite.
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In view of the inherent vulnerability of the Himalaya to various
environmental,
geomorphic
and
geologic
process,
scientists,
researchers, and activists have been warning about the unplanned and
haphazard hydro development in the Sikkim-Darjeeling hills for over
two decades. The governments, both central and state, and development
proponents, however, dismissed the concerns communicated through
scientific reports, papers and other means as fear mongering.
Consequently, the Sikkim and Darjeeling catchment of the Teesta basin
were dotted with many mega hydropower projects during much of the
2000s and 2010s. In fact, Sikkim today has one of the highest densities of
hydropower projects in India.
The Lhonak Lake outburst flood carrying reportedly over 15
million cubic meters of water swept through the steep valley of north
Sikkim, bringing down silt, debris, and boulders and hit the Teesta-III
hydro dam located at Chungthang. Also known as Teesta Urja, the project
was the largest in Sikkim with 1200 MW capacity and located at the
highest elevation of over 1,700 meters above sea level. The flood water
reportedly hit the dam between 11:30 p.m. to 12:30 a.m. (on October 3 to
4).
With the reservoir capacity of 5.08 million cubic metres, the dam
already had water in its reservoir. Unfortunately, the gates of the dam
could not be opened for floodwater to pass through as, reportedly, the
dam authorities did not receive information on time. When the flash
flood hit the dam, it could not withstand the force and eventually
collapsed. The flood hazard, therefore, turned into a massive humanmade disaster downstream of Chungthang, killing close to 100 people,
displacing thousands, and affecting over 100,000 of the population. The
impact of the flood would have been milder had the gates been opened on
time. Furthermore, if there was no dam to obstruct the GLOF, the hazard
VIMAL KHAWAS
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may not perhaps have turned into disaster. The new infrastructure like
dams acts as barriers, whereas earlier the pathway for the floods to go
through the valley was clear. Apart from the series of dams, people have
also settled along the riverbeds, further obstructing the flow of water. It
is also important to understand that the Sikkim-Darjeeling Himalaya,
being a backward and under-researched region, did not have such longterm data on the table when dams were planned and designed in the
early 2000s. That is the reason why anti-dam activists often question the
technical, environmental, and human procedures followed by the
proponents of hydropower dams in the Himalayan region, including in
Sikkim.
Notably, the Teesta-V dam, located about 40 kilometres
downstream of Chungthang, withstood the flash flood as its spillover
gates could be opened, although, reportedly, partially. However, there
are reports that dam to dam communication was not established on time
which led to massive damage of the dam and its offices. It is difficult to
visualize what would have happened to the population downstream if the
Teesta-V had not withstood the Teesta flood and broken down, instead.
The combined water of two dams and the GLOF would have destroyed
two more dams downstream (TDLP-III and IV) in the Darjeeling hills
(under the Gorkhaland Territorial Administration) of West Bengal,
inflicting incalculable human tragedy and giving us one of the biggest
human disasters in the history of the Eastern Himalaya.
In the event of collapse of a series of hydro-dams, the Teesta
flood would have taken with it most of the human settlements
downstream of Dikchu. It would have pushed Sevoke forest, a small
stretch that separates the Teesta and Mahananda Rivers, and joined
Mahananda, washing away a major part of Siliguri city with a population
of close to 1.5 million. Historically, the Teesta joined the Mahananda
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river instead of the Brahmaputra. It was only around the year 1787 that
the Teesta changed its course and became a tributary of the
Brahmaputra. The geomorphic history of the Teesta is complex and this
human failure in its upper catchment invites a detailed investigation.
There is now a common voice in the region—no more dams. The
popular voice is further strengthened by the statement of Karma Loday
Bhutia, Forest and Environment Minister, government of Sikkim,
opposing dam construction in Chungthang following the Teesta disaster.
Sikkim should now concentrate on the efficient handling of the already
constructed
and
commissioned
hydropower
projects
instead
of
venturing into new ones. There should be proper human coordination
and Early Warning System in place to manage its functional dams. The
inefficiency and lack of human coordination to handle current
flashfloods in the upper Teesta catchment has badly exposed Sikkim. A
small
mistake
upstream
will
have
a
tremendous
human
and
environmental impact downstream as it is a common river basin that we
share in the Darjeeling hills, North Bengal plains, and a part of northwest
Bangladesh.
The state of Sikkim needs to evolve a comprehensive regional
hydropower policy in view of its unique regional environment, ecological
setup, and geography. It needs to have a sound hydropower policy,
adequately taking into account the region’s geological and geomorphic
specificities. Mainstreaming of Disaster Risk Reduction (DRR) and
Climate Change (CC) with hydropower policy needs to be prioritized.
Contingency plans for disaster management need to be drawn up for
such events covering all existing hydro-projects in the area. Further, the
mainstreaming of Environmental Management Plan, DRR, and CC in the
development processes and projects, particularly in sensitive sectors like
hydropower projects, is indispensable for the sustainable development
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of the region. The ingress of politics and economics into dams without
adequate precautionary measures will only take us to disaster. The
stakeholders have been talking about an early warning system as one of
the most important instruments of DRR, which the Sendai Framework
(2015-30) also emphasizes. However, we do not have these systems in
many critical hazard-prone areas of Potentially Dangerous Glacial Lakes.
Failure to install an early warning system on time was one of the reasons
why the South Lhonak Lake outburst turned into a disaster.
Rebuilding is a difficult task but not impossible. We need to have
clear
short-,
medium-,
and
long-term
plans
for
sustainable
reconstruction and rehabilitation. This demands a multidisciplinary
approach involving affected people, practitioners, social scientists,
policy planners, physical scientists, elected representatives, civil
societies, and medical and psychological professionals. The promoters of
all big development projects talk about participatory planning on paper.
However, they do not involve people and their concerns/interests when
these projects are actually planned and implemented. This leads to
conflict in the long run and makes the project unsustainable both socioeconomically
and
environmentally.
We
need
decentralized
and
participatory planning of development projects in the true sense.
In the meantime, the Teesta’s message to fellow humans is,
“Sorry folks, I had to do this. I was forced to reclaim my lost spaces. I
wasn’t after you and your assets. I was only clearing my way, so badly
encroached by you, for my smooth flow. That was what I did in 1968 and
decades before, and will do so again in future if you do not stay clear of
my path. I have calmed down, for now. Hopefully, you will respect my
space and path from here onwards. I just need your respect. I shall
reassess my space after few decades. Till then, stay safe.”
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Chungthang Town and Teesta-III Dam Reservoir area:
Before and After the GLOF Event
Source: Picture: via @planet labs, X (accessed and compiled on 15.10.23).
Note on the Author
Vimal Khawas is Professor in the Special Centre for the Study of North
East India at Jawaharlal Nehru University, New Delhi. Previously, he was
Associate Professor in the Department of Peace and Conflict Studies and
Management, Sikkim University. He headed the department in 2018-20.
He holds an MPlan degree (Urban and Regional Planning) from CEPT
University, Ahmedabad, and PhD (Political Geography) from the Political
Geography Division, Centre for International Politics, Organisation and
Disarmament (CIPOD), Jawaharlal Nehru University, New Delhi. His PhD
focuses on the Environmental Security issues and challenges of the
Himalaya. He specializes and works around issues of regional
development & planning, disaster management, and environmental
security. Some of his journal articles are: “Earthquake Disaster and
Vernacular Construction: Experiences from the Sikkim Himalayan
Earthquake, 2011,” with Pribat Rai, Journal of Development Management
and Communication 2.2: (April-June); “Environmental Challenges and
Issues of Human Security in Eastern Nepal,” The Himalayan Miscellany,
VIMAL KHAWAS
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Volume 24 (2014); and “The Project of Gorkhaland,” Social Change 39.3
(2009).