A new water-resources report from the Center for Strategic and International Studies (CSIS) delivers a stark verdict: water-related violence has reached the highest level in recorded history, and the most acute risk surrounding water is geopolitical conflict. The report anchors the claim in two cases — the Yarlung Tsangpo hydropower scheme that keeps India on edge, and the much sharper Egypt–Ethiopia standoff over the Grand Ethiopian Renaissance Dam (GERD), which has come closer to war than any other transboundary water dispute in recent memory.
Read side by side, the two rivers pose the same question from opposite ends: under what conditions can one river start a war?
Water-related violence has reached the highest level in history, and the most severe risk surrounding water is geopolitical conflict.
The Yarlung Tsangpo — Why the Bottleneck Cannot Be Squeezed
China is planning the world's largest super-hydropower complex at the Great Bend of the Yarlung Tsangpo in Mêdog County — the Tibetan reach of the river that India calls the Brahmaputra, "son of Brahma." Planned installed capacity exceeds 60 gigawatts, with annual generation on the order of 300 billion kWh, equivalent to roughly three Three Gorges. From New Delhi's vantage point, this is the source of the anxiety: in theory, China could impound or release water at will, engineering droughts or floods downstream, and has at times run the international argument that downstream flows could be cut by as much as 85%.
But the Yarlung Tsangpo project is a run-of-river scheme using tunneled diversion. It exploits the natural vertical drop to drive turbines, requires no giant dam for storage, and the water that passes through the turbines is not consumed, contaminated, or diverted — it is returned to the river essentially unchanged. At the macro level, the project does not alter the natural runoff, and has no material effect on international water entitlements. Compounding this, the upstream Chinese share of total Brahmaputra flow is only around 30%; the downstream river is built up by tributaries and rainfall. India does not, on the engineering record, have a basis to fear a cutoff of its water supply.
So what is India actually anxious about? The real play lies upstream of the Siang River in the southern Tibetan region, where India is racing to build a 300-meter-high, 9-billion-cubic-meter reservoir — to lock in a "downstream priority of use" as a fait accompli before the Yarlung Tsangpo project comes online. Once the reservoir exists, every subsequent negotiation or arbitration will start from the assumption that India, as the downstream user, holds a privileged right — and the geopolitical card flips into India's hand.
India's Teesta Squeeze on Bangladesh — A Real Bottleneck
What India does to Bangladesh, by contrast, is genuine water-cutoff. On the Teesta, India has diverted upstream water, leaving Bangladesh to alternate between dry-season drought and wet-season flood. Bangladesh has read India's chokehold for what it is, and is responding by drawing in Chinese capital and technology: large-scale dredging of river channels, sediment clearing, embankment and terminal construction on both banks, and joint sharing of upstream Yarlung Tsangpo hydrological data. The project site sits only tens of kilometers from India's "Chicken's Neck" Siliguri Corridor — and India's defense establishment finds it hard to breathe.
The full arc of China's engagement on the Teesta is traced in a related page on Bangladesh's comprehensive turn toward Beijing — see the linked Chinese-language essay below.
The Grand Ethiopian Renaissance Dam — Why It Nearly Started a War
Egypt's population and economy are crowded almost entirely along the Nile and its delta; outside the river there is essentially nothing. The Nile decides life and death. The Blue Nile, which contributes the larger share of flow, rises on the Ethiopian Highlands. Ethiopia, looking to escape poverty and electrify an industrialization push, needs that highland hydropower. The colonial-era framework — drawn up by Britain — allocated virtually all of the Nile's water to Egypt and Sudan, leaving Ethiopia next to nothing. Ethiopia's claim is redistribution; Egypt's is historical entitlement. Mediation under the African Union has failed to break the deadlock.
By the time Egypt woke up to the construction, Ethiopia had already completed a dam with a reservoir capacity of 74 billion cubic meters. The filling phase will absorb a large share of the flow that would otherwise reach Egypt, and the two sides have not reached any operational agreement on filling or release. If an extreme drought hits East Africa, water stress can translate directly into military confrontation. Egypt's former president Anwar Sadat once put it bluntly: he would rather die fighting in Ethiopia than wait to die of thirst.
China–India vs. Egypt–Ethiopia — Where the Lines Are Drawn
Both cases involve an upstream dam. Why is the China–India risk manageable, while Egypt–Ethiopia stands at the brink of war? Three dividing lines.
- Whether the upstream works can materially change downstream flow. The Yarlung Tsangpo scheme is run-of-river, non-storage, and cannot meaningfully alter flow; the GERD's 74-billion-cubic-meter reservoir genuinely can swallow Egypt's share during filling.
- Whether the downstream is existentially dependent on the river. India still has the Ganges and other large river systems as a cushion; Egypt's population and economy are bound almost entirely to the Nile, with no substitute.
- Whether the two sides retain strategic rationality. China and India are both major powers and will not push each other to the wall; Egypt and Ethiopia are both unyielding — one clinging to colonial water rights, the other to a completed dam — with no buffer between them.
Other Front Lines and the Two Kinds of Solution
The report widens the lens to other water flashpoints. The Colorado River flows from the United States to Mexico; upstream U.S. dams, including Hoover, intercept irrigation flows, leaving Mexico with barely a trickle. Mexico is in water debt, and the delta wetlands are on life support. Within the United States, the states cannot agree among themselves: the temporary operating guidelines expire at the end of this year, the federal government wants to centralize cuts on downstream use, and legal battles are queued up. Multinational corporations clash with local communities over water, even data-center siting is now complicated by hydrology. Tehran's 14 million people face extreme scarcity, the major reservoirs are close to empty, and groundwater over-extraction is causing severe subsidence — President Masoud Pezeshkian has said that relocating the capital is no longer optional. In the U.S.–Iran conflict, four desalination plants have already been struck directly. When a city's water depends entirely on desalination, a concentrated attack on plants and pipelines can paralyze civilian life and industry; the risk is over-concentrated.
The report's two recommendations: first, build a diversified water-resource portfolio — do not put all the eggs in the desalination basket; second, classify key hydraulic infrastructure as a strategic national asset, and tighten foreign-investment review on water-related projects.
The United States tends to treat water as a geopolitical tool, traded and bargained within the country and with neighbors. China has followed a basin-co-governance path — the Lancang–Mekong cooperation framework, which has shifted from unilateral upstream development to whole-basin joint governance, is often cited as a model for breaking the zero-sum deadlock of traditional water disputes.
The Yarlung Tsangpo Data Halt — India Presses to Resume Hydrological Sharing
On August 7, the Economic Times reported that India, at the 36th round of the China–India Working Mechanism for Consultation and Coordination on Border Affairs (WMCC), urged China to resume sharing hydrological data on the Yarlung Tsangpo and called for an early meeting of the expert-level mechanism on transboundary rivers.
The background of this demand connects directly to the framing laid out at the top of this page. China is planning to spend roughly RMB 1.2 trillion (about USD 170 billion at current rates) to build the dam in Tibet — a project expected to take close to a decade. India is concerned about ecological and downstream impacts; Bangladesh has separately noted that China has not shared hydrological data on the river since June 2023. The data halt is not new — it has lasted three years — but this time it has been put on the official agenda.
India's request has two layers: resume hydrological data sharing, and provide technical details of upstream projects. Read together, what India actually wants is a "right to know" — dam construction progress, impoundment schedules, flood-release arrangements, all of which directly affect the water security of millions downstream. The absence of data leaves downstream users guessing about upstream intent. This is the flip side of the "water as weapon" framing laid out at the top of this page: China has not turned water into a weapon, but the silence of the data is itself creating imagination space downstream.
The page's opening framework poses the question "China–India vs. Egypt–Ethiopia — where the lines are drawn" and argues that China has followed a basin-co-governance path. This section supplies the latest test case for that framework: the inclusion of transboundary-river data sharing on the WMCC agenda shows the Yarlung Tsangpo question has moved from a technical-cooperation topic to a border-trust topic — the very test of whether the "water as a public good" narrative can continue.
Worth noting is the diplomatic packaging of this round of demands: India raised the issue at the WMCC, and after the meeting the Ministry of External Affairs issued a statement emphasizing it. Putting a technical issue inside the border-consultation mechanism is equivalent to labeling the hydrological question "border-trust building." China agreed to continue communication through existing diplomatic and military channels to prevent misunderstanding or miscalculation. Whether data sharing actually resumes has not yet produced a result, but the topic itself has now entered the official bilateral dialogue track.
Three years after the Yarlung Tsangpo data halt, the issue has now become a diplomatic item — a sign that downstream countries' anxiety about the upstream's right to know will not dissipate on its own. The scale of the dam (RMB 1.2 trillion, a decade of construction) has turned hydrological data from a technical parameter into a security parameter. By embedding the data question in the border mechanism, India is institutionalizing the upstream's transparency obligation — whether the negotiation succeeds will depend on whether China is willing to treat data sharing as part of trust-building.