Siang dam plan pits India's China strategy against Adi land rights
The proposed 11,200-MW Siang Upper Multipurpose Project in Arunachal Pradesh faces opposition from the Adi community over displacement, ancestral land and ecology. India sees it as a counter to China's 60,000-MW dam on the Yarlung Tsangpo. The Hindu argues India must respect land rights while building dams.
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The brief in 7 cards
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Note1 / 7
WHY IN NEWS?
- The proposed Siang Upper Multipurpose Project (SUMP) faces opposition from the indigenous Adi community in Arunachal Pradesh.
- Their concerns are displacement, ancestral land rights and ecological damage.
- India views SUMP as a strategic response to China's 60,000-MW mega-dam on the Yarlung Tsangpo in Tibet.
- The Hindu's editorial argues India must respect its people's land rights while building dams.
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TWO DAMS ON ONE RIVER
The Yarlung Tsangpo becomes the Siang in Arunachal Pradesh and the Brahmaputra in Assam. The table compares the two projects.
Feature India's SUMP China's Yarlung Tsangpo project Location Siang river, Arunachal Pradesh Lower Yarlung Tsangpo, Medog County, Tibet Capacity 11,200 MW proposed About 60,000 MW across five cascade stations Main purpose Storage and flood moderation, with power Power, about 300 billion units a year Status Pre-feasibility report incomplete; surveys stalled by protests Construction began in July 2025 The government's case for SUMP rests on five claims.
- Water security: A large reservoir could absorb sudden upstream releases, if reliable flow data is available.
- Strategic resilience: It strengthens India's infrastructure presence amid China's claims over Arunachal Pradesh.
- Energy: It would add large renewable generation capacity.
- Flood moderation: Controlled releases could regulate downstream flows in Assam.
- Development: It could bring jobs and connectivity to remote border areas.
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KEY CONCEPTS: CHINA'S DAM AND WATER SECURITY
- Why does China's dam worry India?
Sudden releases or altered seasonal flows could raise flood risks downstream. China shares little operational detail, which complicates India's reservoir planning.
- Can China control the Brahmaputra's flow?
Only partly. Monsoon rain and tributaries joining in India contribute much of the river's discharge. This limits China's control over total flow.
- What data does China share?
India-China arrangements have mostly covered flood-season data and emergencies. India has pressed for renewal of the lapsed river data agreements.
- What is a GLOF?
A glacial lake outburst flood happens when a lake dammed by ice or debris suddenly bursts. It can send a wall of water down a valley.
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THE CHALLENGES
The problems fall into two groups, environmental and social. The table lists each with what it means.
Challenge What it means Seismic risk The eastern Himalayas are tectonically active; the 1950 Assam-Tibet earthquake shows the danger GLOFs and landslides Glacial lake bursts and unstable slopes can trigger catastrophic floods Biodiversity loss The reservoir would submerge forests and aquatic habitats Sedimentation Heavy silt loads reduce storage and efficiency over time Cumulative impact Many dams together disrupt river ecology and sediment flow Displacement Community estimates say 27 villages could be fully submerged and 40–50 more affected Cultural loss The Adi revere the river as Aane Siang, or Mother Siang Customary rights The Kebang, the Adi village council, is the traditional decision-making body Coercive governance Security deployment and action against protesters have deepened distrust Consultation deficit Weak participation undermines the project's legitimacy The government argues the dam protects the region from upstream releases. Its livelihood programme covers 26 affected villages. Protesting groups argue that consent has not been sought freely.
This card sets out documented positions. It does not adjudicate between them.
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LESSONS FROM SUBANSIRI
The 2,000-MW Subansiri Lower project on the Arunachal-Assam border shows the cost of conflict. The table sets out its record.
Aspect Subansiri Lower Capacity Eight units of 250 MW each Delay Work stopped from December 2011 to October 2019 after protests over safety and downstream impacts Cost Rose from ₹6,285 crore (2002 estimate) to about ₹26,075 crore Status Partial commercial operation began in December 2025 Prolonged conflict raises costs and weakens public confidence.
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CONSTITUTIONAL AND LEGAL SAFEGUARDS
These provisions shape how a dam can take land in Arunachal Pradesh.
Provision What it does Article 21 Protects life, dignity and a healthy environment, as read by courts Article 300A No one can be deprived of property except by authority of law Article 371H Gives the Governor special responsibility for law and order in Arunachal Pradesh RFCTLARR Act, 2013 Requires Social Impact Assessment, fair compensation and rehabilitation Forest Rights Act, 2006 Recognises individual and community forest rights Dam Safety Act, 2021 Sets up dam inspection, surveillance and safety institutions -
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WAY FORWARD
These are the editorial's suggestions, not adopted policy.
- Involve affected communities and the Kebang in decisions, and share benefits locally with fair compensation and livelihoods.
- Conduct cumulative environmental, seismic and hydrological impact assessments.
- Negotiate transparent data-sharing and advance notice of releases with China.
- Strengthen early-warning systems and downstream evacuation plans.
- Coordinate the Centre, Arunachal Pradesh and Assam on basin-wide management.
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Sources
- The Hindu (editorial attribution in supplied coaching note; not directly accessed) · Editorial, Page 6; source supplied by editor · 3 November 2026
- ThePrint — Why Siang mega-dam, India’s counter to China’s, is yet to take off · Proposal status, surveys, 26-village livelihoods programme · 27 October 2026
- Down To Earth — Why Arunachal Pradesh is protesting a proposed 11,200-MW dam · SUMP proposal and pre-feasibility stage · 29 October 2026
- Press Information Bureau, Ministry of Power — First Unit of Subansiri Lower Project · Subansiri Lower partial commercial commissioning · 23 December 2025
- Scroll — Tensions in Siang Valley as armed forces deployed to conduct dam survey · Deployment and protests in May 2025 · 22 May 2025
- India Today NE — Subansiri Hydropower Project begins partial commercial operations · Cost history and construction hiatus · 24 December 2025
Syllabus
| Paper | Subject | Sub-topic |
|---|---|---|
| GS3 | Environment | Environment, infrastructure (energy), disaster management and security in border areas |
| GS2 | International Relations | India-China relations |
| GS2 | Social Justice | Welfare of Scheduled Tribes |
| GS1 | Geography | Geography of the Brahmaputra basin |
| Prelims | Geography | Siang-Brahmaputra system, Article 371H, Dam Safety Act and Subansiri |
Topics
Related previous-year questions
Asked in earlier UPSC Prelims papers on this topic. Answer, then check.
The Brahmaputra, Irrawaddy and Mekong rivers originate in Tibet and flow through narrow and parallel mountain ranges in their upper reaches. Of these rivers, Brahmaputra makes a ‘U’ turn in its course to flow into India. This ‘U’ turn is due to
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Answer: B. Correct Answer: Syntaxial bending of geologically young Himalayas The sharp “U-turn” of the Brahmaputra around Namcha Barwa is due to the syntaxial bending of the geologically young Himalayas. Explanation The Himalayas are young fold mountains formed due to the collision of the Indian Plate with the Eurasian Plate. At both ends, the Himalayan ranges take sharp bends, known as syntaxial bends. The eastern syntaxial bend occurs near Namcha Barwa, where the Brahmaputra, known as the Tsangpo in Tibet, takes a sharp turn and enters India as the Siang or Dihang in Arunachal Pradesh. This bend is not simply due to uplift. Uplift explains the rise of the Himalayas, but syntaxial bending explains the sharp horizontal turn of the mountain ranges and the river course. Extra UPSC Info The western syntaxial bend is near Nanga Parbat. The eastern syntaxial bend is near Namcha Barwa. The Brahmaputra is an antecedent river, meaning it existed before the Himalayas were fully uplifted. It cuts deep gorges through the Himalayas, including the Yarlung Tsangpo Grand Canyon. In Tibet, it is called Tsangpo; in Arunachal Pradesh, Siang/Dihang; in Assam, Brahmaputra; and in Bangladesh, Jamuna. Final Takeaway The Brahmaputra’s sharp U-turn near Namcha Barwa is best explained by the syntaxial bending of the young Himalayan ranges, not merely by uplift or general tectonic disturbance.
Difficulty: medium · direct
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Which of the following is/are tributary/tributaries of Brahmaputra? 1. Dibang 2. Kameng 3. Lohit Select the correct answer using the code given below.
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Answer: D. VERDICT: The answer is 1, 2 and 3. The Dibang, Kameng and Lohit are all tributaries of the Brahmaputra. ANALYSIS: All three rise in the eastern Himalaya within Arunachal Pradesh and drain south into the Brahmaputra. The Lohit joins in the extreme east, near where the Brahmaputra enters Assam, and the Dibang joins close by, the two together with the Siang forming the main stream. The Kameng, called the Jia Bhoroli in Assam, joins from the north further downstream. Since all three lie within the same eastern Himalayan drainage, none can belong to another system. SOURCE: NCERT Class XI, India: Physical Environment, page 26. Source type EM. HOW TO CRACK IT: Use the geography of the source region as the filter. Any river rising in Arunachal Pradesh has nowhere to go except the Brahmaputra, because the State lies wholly within that basin, so identifying the State of origin settles tributary questions without a river list. Note the same logic applied in reverse for 2015's question on the Barak, which rises in Manipur and therefore belongs to a different system entirely. Basin thinking answers both.
Difficulty: medium · statement
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With reference to river Teesta, consider the following statements: 1. The source of river Teesta is the same as that of Brahmaputra but it flows through Sikkim. 2. River Rangeet originates in Sikkim and it is a tributary of river Teesta. 3. River Teesta flows into Bay of Bengal on the border of India and Bangladesh. Which of the statements given above is/are correct?
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Answer: B. VERDICT: The answer is 2 only. The Rangeet is a tributary of the Teesta, but the Teesta does not share the Brahmaputra's source and does not reach the Bay of Bengal directly. ANALYSIS: Statement 2 is CORRECT. The Rangeet rises in Sikkim and joins the Teesta near the Teesta Bridge, below Kalimpong and Darjeeling. Statement 1 is INCORRECT. The Teesta rises from the Pahunri or Teesta Kangse glacier in the Sikkim Himalaya, whereas the Brahmaputra rises far away in western Tibet as the Yarlung Tsangpo. Statement 3 is INCORRECT. The Teesta flows south into West Bengal and then into Bangladesh, where it merges with the Brahmaputra system rather than entering the Bay of Bengal on the India and Bangladesh border. HOW TO CRACK IT: Statement 1 fails on a general principle rather than a detail, since two rivers with different courses through different ranges cannot share a glacier source, and the Brahmaputra's Tibetan origin is one of the best known facts in Indian geography. Then remember that most north Bengal rivers are tributaries within the Ganga and Brahmaputra system rather than independent rivers reaching the sea. The PDF gives no usable source for this row.
Difficulty: medium · statement
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Identify the river of the Indian sub-continent on the basis of the following information: 1. It has an antecedent drainage system. 2. It flows through three countries. 3. It originates in the Tibetan Plateau and is an important river for irrigation. 4. It does not form distributaries. Select the answer from the following:
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Answer: C. The Satluj originates in the 'Raksas tal' near Mansarovar at an altitude of 4,555 m in Tibet, where it is known as Langchen Khambab. It flows almost parallel to the Indus for about 400 km before entering India, and comes out of a gorge at Rupar. It passes through the Shipki La on the Himalayan ranges and enters the Punjab plains. It is an antecedent river, which satisfies the first clue. It flows through China (Tibet), India and Pakistan, satisfying the second clue. It originates in the Tibetan Plateau and is a very important tributary as it feeds the canal system of the Bhakra Nangal project, satisfying the third clue. It also does not form distributaries, satisfying the fourth clue. Hence option (c) is the correct answer.
Difficulty: easy · statement
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Practice questions
Consider the following statements about the Brahmaputra: 1. It is known as the Yarlung Tsangpo in Tibet; 2. It enters India as the Siang in Arunachal Pradesh; 3. The Subansiri is a tributary that joins it in Assam. Which of the statements given above are correct?
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Answer: D. The river is the Yarlung Tsangpo in Tibet, the Siang in Arunachal and the Brahmaputra in Assam; the Subansiri is its largest tributary.
Difficulty: medium · statement
Article 371H of the Constitution makes special provision for which State, and on what subject?
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Answer: B. Article 371H gives the Governor of Arunachal Pradesh special responsibility for law and order.
Difficulty: medium · statement
With reference to the Right to Fair Compensation and Transparency in Land Acquisition, Rehabilitation and Resettlement Act, 2013, consider the following statements: 1. It provides for a Social Impact Assessment before acquisition; 2. It covers rehabilitation and resettlement of affected families; 3. It replaced the Land Acquisition Act, 1894. Which of the statements given above are correct?
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Answer: D. The 2013 Act replaced the colonial 1894 law and added Social Impact Assessment and rehabilitation duties.
Difficulty: medium · statement
Mains practice
Answer-writing practice on this article. Attempt it first, then open the hints.
Large dams in the eastern Himalayas sit at the meeting point of strategy, ecology and tribal rights. Discuss with reference to the Siang Upper Multipurpose Project.
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- State the project and China's dam
- give strategic and flood-control arguments
- list seismic, GLOF and sediment risks; explain Adi concerns, the Kebang and legal safeguards
- draw on Subansiri
- suggest consent-based, data-driven planning and water diplomacy.