The Ganga Countdown: Time is Running Out and so is the Water

On 12 December 2026, thirty years of structured water diplomacy between India and Bangladesh will formally expire as the Ganga Water Treaty, signed in 1996, is set to lapse. It started gaining momentum with the recent political changes in Dhaka, renewing debates over water sharing, taking it to the spotlight with urgency not seen in decades.

Illustration by The Geostrata

The renewal of this treaty is not merely a hydrological question. It is a barometer of the India-Bangladesh relationship, a stress test of South Asia's water diplomacy architecture, and, most critically, accounting for a hydrological reality that 1996 simply could not have anticipated.

THE 1996 BARGAIN: WHAT'S AGREED, AND WHY HASN'T IT DELIVERED?

When India and Bangladesh signed the treaty in December 1996, Bangladesh aimed to secure at least half of the water available at Farakka with India retaining enough to maintain the navigability of the Kolkata port. As a result, the treaty focused on the volumetric sharing of Ganges water, based on flow data between 1949 and 1988.

That baseline is now its sin as the flow data forming the treaty's allocation formula is drawn from a pre-climate stress era. When the treaty was signed thirty years ago, the Ganga's water flow was very different. Indian states like Bihar, along with Bangladesh, deal with floods during the monsoon and droughts in the summer as a result of climate change.

A treaty standing on mid-twentieth-century hydrology is being asked to govern a twenty-first-century crisis. Despite the treaty, Bangladesh is still struggling with numerous complex water-related crises, including desertification, water scarcity during the dry season, excessive flooding during monsoons, aggressive riverbank erosion, groundwater depletion, loss of navigability, and upstream salinity intrusion.

Dhaka's water experts have already documented that Bangladesh did not receive its fair share in 39 of 60 critical periods, particularly in March and April between 1997 and 2016, the very windows when agricultural demand peaks on both sides. A treaty that has failed in practice for more than half its operating tenure has lost its moral authority, even before it loses its legal standing.

BANGLADESH'S AGENDA: BEYOND VOLUME TO ECOLOGICAL JUSTICE

For Dhaka Post Sheikh Hasina, from the interim government of Muhammad Yunus to the present government led by Tarique Rahman, the renewal negotiation is an opportunity to reframe the entire architecture of India-Bangladesh water relations. Bangladesh enters these talks with fundamentally different intentions than in 1996. 

First, Dhaka is pushing to move beyond Farakka-centric, point-specific water accounting. Bangladesh is arguing that the treaty's focus on water supply at the Farakka Barrage, a single location, is one of its structural flaws and that the flows of the Ganga from its source to its mouth to be considered, which is a demand for basin-wide governance, not just barrage-level arithmetic. 

Second, Bangladesh wants climate adaptation written into the treaty. The 1996 treaty treats water as a divisible commodity to be quantified and allocated based on historical data rather than as a shared, interconnected ecological system. It does not have any flexible mechanisms for climate adaptation and enforceable environmental flow regimes or joint data sharing platforms. The successor agreement, from Dhaka's standpoint, must be inclusive of such adaptive allocations that revise sharing, as actual flows shifted due to glacial retreat and seasonal variability.

Third, and most strategically, Bangladesh's accession to the Water Convention is signalling a new reality which says bilateralism alone can no longer serve India's hydropolitical interests in an increasingly unpredictable regional landscape. By joining the UN Watercourses Convention, Dhaka has quietly internationalised its water claims, signalling to New Delhi that future non-cooperation carries multilateral reputational costs.

INDIA'S CALCULUS: HYDRAULIC LEVERAGE IN A CHANGING BASIN

India's position in these negotiations has hardened considerably since the Pahalgam attack and the suspension of the Indus Waters Treaty with Pakistan. Following India's suspension of the Indus treaty, New Delhi indicated that it wants to renegotiate the Ganga treaty, stating there is "a need to rethink the treaty to ensure optimal balance in water sharing between West Bengal and Bangladesh." 

India want a shorter treaty duration that lasts 10 to 15 years rather than another 30-year term and have reportedly indicated to Dhaka that a new deal should reflect India's growing development requirements and also demanded an additional 30,000 to 35,000 cusecs of water during critical periods to meet rising demands in West Bengal, driven by expanding irrigation, power generation at the NTPC Farakka plant, and port operations at Kolkata.

There are concerns in India about the efficacy of the 1996 Ganga Waters Treaty, whether its framework adequately reflects contemporary bilateral realities including unresolved security dimensions of the relationship.

It underscores the complex domestic political environment within which both governments must navigate treaty renewal and signals to negotiators on both sides that they must address not only hydrological formulae but also the broader architecture of bilateral trust.

THE TEESTA GHOST: THE UNFINISHED BUSINESS THAT HAUNTS EVERYTHING

Ganga treaty renewal can’t proceed without confronting the Teesta, the shadow treaty that never was, and whose failure has poisoned the well of bilateral water diplomacy for more than a decade.

Efforts to secure a comprehensive agreement progressed in 2011,with a draft treaty that proposed allocating 37.5 percent of the Teesta's water to Bangladesh during the dry season. However, opposition from West Bengal's Chief Minister Mamata Banerjee, citing concerns about water scarcity in the state, stalled the agreement.

It’s been more than a decade on, nothing much changed structurally. Centre is navigating a tougher political situation as there’s nearby elections in West Bengal with Banerjee's Trinamool Congress continuous opposition of any such treaty saying it will hurts Bengal’s development but it’s up to Centre to go ahead with the treaty as Article 253 of the Indian Constitution gives Parliament power to make laws for the whole or any part of India to implement international treaties, on subjects listed in the State List, without needing the consent of states.

The Teesta River basin accounts for approximately 14 percent of Bangladesh's total arable land and supports the livelihoods of 7.3 percent of the country's population.

The consequences of inaction are not abstract: over one lakh hectares of land across five districts face acute shortages during the dry season, and Bangladesh loses approximately 1.5 million tons of rice annually due to water shortage. 

For Dhaka, the Teesta failure is not a separate file, it is the defining precedent that tells Bangladesh what India's federal politics can and will do to even agreed-upon treaties. It has created a trust deficit which the Ganga renewal negotiations have inherited. West Bengal's resistance to sharing water is structural, not incidental, and it’s likely to play a significant role in renewal of the Treaty, a reality New Delhi cannot ignore and Dhaka cannot overlook.

THE CLIMATE VARIABLE: THE FOURTH ACTOR IN THE ROOM

Any serious renewal must treat climate change not as a footnote but as a co-negotiating force. The Himalayan glaciers feeding the Ganga system are under accelerating stress. Himalayan glaciers are projected to decline by up to 40 percent by 2100,meaning Bangladesh faces a future of catastrophic monsoon floods followed by an acute dry season with water scarcity.

A static, volume based formula cannot survive this. What's needed instead is a variable allocation mechanism, one that establishes climate triggered thresholds and automatic consultation protocols when flows fall below agreed ecological minimums. Adaptive water allocation becomes paramount as river flows shift, balancing equitable distribution with ecological resilience, and proactive flood management through data driven insights needs to be incorporated in renegotiated treaties. 

The Sunderbans, the world's largest mangrove forest, straddling both nations  is the most visible victim of this failure. Failure to renew or replace the treaty could trigger severe water scarcity in Bangladesh, devastating its agricultural heartland, displacing communities, and potentially causing irreversible damage to the fragile ecosystem.

A resource shared by both nations, the Sundarbans offers a rare convergence point, its ecological survival is in India's interest as much as Bangladesh's, and it should guide the shared environmental compact of any successor treaty.

WHAT A CLIMATE RESILIENT SUCCESSOR TREATY MUST INCLUDE

A renewal that merely extends the 1996 formula would be a diplomatic failure dressed as continuity. The successor treaty must innovate across four dimensions. Dynamic allocation based on real time hydrology, not 1949-1988 baseline data.

Joint monitoring stations across the Ganga-Padma system must feed live data into an agreed allocation algorithm, thereby sharing waters responsive to actual river conditions rather than historical averages. Upstream transparency obligations, addressing what Bangladesh has long flagged as a core flaw, the lack of transparency that forces Dhaka to accept provided data on faith, fuelling persistent suspicion that undeclared upstream diversions diminish the river's flow before it is measured at Farakka.

Ecological flow guarantees for the Sundarbans and the Padma delta, including in treaty as legally binding obligations, not aspirational language. A linkage framework that connects Ganga renewal to Teesta progress, treating both rivers as part of one water diplomacy portfolio rather than continuing the friction that can be resolved in isolation.

THE GEOPOLITICAL STAKES: WATER, CHINA, AND THE NEIGHBOURHOOD POLICY TEST

The renewal negotiation doesn’t occur in a vacuum as China's deepening engagement with Bangladesh through the proposed Teesta River management project and broader infrastructure investment has introduced a third actor into what India has traditionally managed as a bilateral relationship. It's now complicated by a deep, strategic partnership between Dhaka and Beijing, transforming the water sharing discourse from a bilateral issue into a complex geopolitical chess match, challenging India's long-standing regional dominance. 

India's Neighbourhood First policy cannot survive on diplomatic rhetoric alone. India, as the powerful upper riparian nation, might increasingly view water control as a geopolitical tool, a prospect that deeply concerns Bangladesh and risks broader regional instability.

Every month of delay in a credible, equitable renewal agreement is a month Beijing can convert into strategic capital in Dhaka. The calculus for New Delhi should be clear with a generous, climate responsive Ganga treaty renewal, one that requires more difficult conversations with West Bengal than losing Bangladesh to China's infrastructure courtship. Water diplomacy is neighbourhood policy by another name. And right now, India is at risk of losing both.

THE DEADLINE IS NOT DECEMBER, IT IS NOW

As talks are in progress, the renewal of the treaty will test both countries' ability to balance domestic priorities with regional cooperation, particularly in the context of climate variability and growing water stress in the Ganga basin. The political window for a substantive agreement is narrowing rapidly.

West Bengal's electoral calendar, Bangladesh's fragile politics, and India's post-Pahalgam security posture all create friction that will only grow with time. The 1996 treaty was signed in a matter of weeks when the political will existed on both sides. That precedent holds its own lesson.

Water diplomacy in South Asia is not primarily a technical problem, it is a political one. And political problems yield to political will. The Ganga does not wait for diplomatic convenience. Thirty years ago, two prime ministers chose cooperation over contest.

The choice in 2026 is the same. The consequences of getting it wrong, however, are far larger for the river, for the delta, and for the future of South Asian regional order.

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BY PUNEETH

TEAM GEOSTRATA

info@thegeostrata.com