India receives most of its annual rainfall within a few monsoon months, and it falls very unevenly across the country. The Brahmaputra and Ganga basins are drenched and often flooded, while large parts of Rajasthan, Gujarat, Maharashtra, Karnataka and Bundelkhand struggle with recurring drought. The idea behind river interlinking is simple to state: carry surplus water from rivers that have too much to rivers and regions that have too little, using canals, reservoirs and tunnels that connect one basin to another.
Over the decades this idea has grown into the National River Linking Project (NRLP), one of the most ambitious and most debated water-engineering proposals in the world. Supporters see a way to secure irrigation, drinking water and power; critics point to ecological risk, displacement, huge costs and the complexity of sharing water between states and neighbouring countries. This explainer sets out how the plan works, what it includes, where it stands, and why it remains controversial.
Quick Facts
| Item | Detail |
|---|---|
| Official name | National River Linking Project (NRLP), earlier the National Perspective Plan |
| Perspective plan prepared | 1980, by the then Ministry of Irrigation |
| Implementing and planning body | National Water Development Agency (NWDA), set up in 1982 |
| Parent ministry | Ministry of Jal Shakti (Department of Water Resources, River Development and Ganga Rejuvenation) |
| Components | Himalayan Rivers Development and Peninsular Rivers Development |
| Proposed links | About 30 (roughly 14 Himalayan and 16 Peninsular) |
| Flagship project | Ken-Betwa Link Project (Madhya Pradesh and Uttar Pradesh), the first link to be taken up for implementation |
| Key legal backdrop | Water is a State subject (Entry 17, State List); regulation of inter-state rivers falls under Entry 56, Union List |
| Main controversies | Ecological impact, displacement, cost, inter-state disputes and downstream international concerns |
The Idea Behind River Interlinking
India supports a very large population on a limited share of the world’s freshwater, and the availability of that water is highly seasonal. Most of the rainfall arrives between June and September, and many rivers swell during these months and shrink to a trickle in summer. The southern peninsula depends on rivers that are largely rain-fed, while the Himalayan rivers also draw on glacial melt and carry water across a longer part of the year.
River interlinking tries to correct this imbalance by moving water through engineered connections. A typical link has a storage dam on the donor river, a canal or tunnel that crosses a watershed divide, and a way of delivering the transferred water to the recipient basin. Some links rely on gravity, while others need lift pumps to raise water over higher ground.
Surplus and deficit basins
The central concept is that of a “surplus” basin and a “deficit” basin. Water planners describe a basin as surplus when its available flow is greater than its foreseeable needs, and deficit when needs outstrip availability. The Brahmaputra, the Ganga in its lower reaches, the Mahanadi and the Godavari are commonly treated as surplus rivers in planning documents, whereas the Cauvery, Pennar, Vaigai, Sabarmati and several rivers of western Rajasthan and Gujarat are treated as deficit systems. The calculation of what is truly “surplus” is itself contested, which is one reason the project attracts debate.
Historical Background of the Proposal
The thought of linking rivers is older than independent India. In the nineteenth century, the British engineer Sir Arthur Cotton proposed connecting major rivers, chiefly to create inland navigation routes and to move goods across the subcontinent. Irrigation canals were then built on a large scale in the Ganga plains, the Deccan and the Madras Presidency, establishing the tradition of engineered water transfer.
In the 1960s the engineer and later Union minister Dr K. L. Rao suggested a Ganga-Cauvery link that would lift Ganga flood water across the Deccan plateau. Another idea of the same era, the “Garland Canal” proposed by Captain Dinshaw Dastur, envisaged a ring of canals around the country. Both were considered too costly or technically impractical, but they kept the idea alive.
From the National Perspective Plan to the NRLP
In 1980 the Ministry of Irrigation formulated the National Perspective Plan for water resources development, identifying the Himalayan and Peninsular components. The National Water Development Agency was set up in 1982 to carry out surveys and prepare feasibility reports. In 2002 a Task Force on Interlinking of Rivers was constituted after the Supreme Court and the government expressed interest in speeding up the project. Over time the effort has been renamed and reorganised, and today it is generally referred to as the National River Linking Project.
The Two Components: Himalayan and Peninsular
The NRLP is divided into two major components, which differ in character, scale and complexity.
The Himalayan Rivers Development component
This component envisages linking the Ganga and Brahmaputra basins and their tributaries with each other and with rivers further west and south. It would involve building storage reservoirs on the principal rivers in India and Nepal, and canal links to transfer surplus flows to the west. The aims include controlling floods in the Ganga-Brahmaputra plains, supplying water to the arid west and providing hydropower along the way. Some of its links, such as those on the Kosi, Gandak and Sharda systems, would involve Nepal, and the Brahmaputra links would involve Bhutan and Bangladesh in various ways, which makes this component diplomatically sensitive.
The Peninsular Rivers Development component
This component comprises links among the rivers of southern and central India. It proposes connecting the Mahanadi and Godavari with the Krishna, Pennar and Cauvery, and also links involving the rivers of Maharashtra, Gujarat and Madhya Pradesh. Because this region lies wholly inside India, the component is considered easier to negotiate internationally, but it still requires agreement among the states involved.
| Feature | Himalayan component | Peninsular component |
|---|---|---|
| Approximate number of links | About 14 | About 16 |
| Main source of water | Ganga, Brahmaputra and their tributaries (snow-fed and rain-fed) | Mahanadi, Godavari and west-flowing rivers (mostly rain-fed) |
| Chief goals | Flood moderation, western transfer, hydropower, navigation | Irrigation and drinking water for the drier south and centre |
| International dimension | Involves Nepal, Bhutan and Bangladesh | Largely domestic, with inter-state agreements |
| Engineering profile | Large dams and long canals, difficult Himalayan terrain | Considerable lifting of water over the Deccan plateau |
Major Proposed Links
The proposed schemes have names that reflect the rivers they join. The list below mentions several of the better-known ones from official planning documents, grouped by component. The exact number of links and their design have been revised over time as feasibility studies progressed.
Peninsular links
- Mahanadi-Godavari link, followed by the Godavari-Krishna and Krishna-Pennar-Cauvery links, forming a chain across the eastern peninsula
- Ken-Betwa link in Bundelkhand
- Parbati-Kalisindh-Chambal link in Madhya Pradesh and Rajasthan
- Par-Tapi-Narmada and Damanganga-Pinjal links in western India
- Pamba-Achankovil-Vaippar link in Kerala and Tamil Nadu
Himalayan links
- Kosi-Mechi and Kosi-Ghaghara links in Bihar and Uttar Pradesh
- Gandak-Ganga and Sharda-Yamuna links
- Brahmaputra-Ganga links, such as the Manas-Sankosh-Tista-Ganga and Jogighopa-Tista-Farakka proposals
- Ganga-Damodar-Subarnarekha and Subarnarekha-Mahanadi links in eastern India
- Yamuna-Rajasthan and Rajasthan-Sabarmati links to carry water to the arid west
The National Water Development Agency
The National Water Development Agency, or NWDA, is the technical body that gives the NRLP its engineering backbone. Established in 1982 as a society under the Societies Registration Act, it works under the Ministry of Jal Shakti. Its original mandate was to carry out detailed surveys and investigations of the proposed links, assess the quantity of surplus water, and prepare feasibility reports and detailed project reports.
What the agency does
- Studies the hydrology of donor and recipient basins to estimate water availability
- Prepares pre-feasibility and feasibility reports for each link
- Prepares detailed project reports (DPRs), which are the basis for sanction and construction
- Holds consultations with the states that would share in a link
- Helps negotiate agreements on cost sharing and water allocation between states
The government has also set up bodies to coordinate and push the agenda, including a Special Committee on Interlinking of Rivers and a task force at the national level. Proposals to create a dedicated National Interlinking of Rivers Authority have been discussed so that clearances and disputes can be handled by a single body, though such arrangements have required agreement from states.
The Ken-Betwa Link Project
The Ken-Betwa Link Project is the flagship of the programme and the first link to be taken up for implementation under the NRLP. The Ken and the Betwa are both tributaries of the Yamuna and flow through Madhya Pradesh and Uttar Pradesh in the Bundelkhand region, a historically drought-prone area with thin soils and erratic rainfall. The plan is to transfer water from the Ken, considered to have a surplus, to the Betwa basin, which is considered deficit.
Main features
- A dam at Daudhan on the Ken and a canal running westward to the Betwa
- Planned irrigation for districts of both states in Bundelkhand, together with drinking water supply
- Hydropower and solar components attached to the dam complex
- An agreement between the Union government and the two states signed on 22 March 2021, observed as World Water Day
Why it is both important and contentious
Its supporters describe it as a model for how a link can be made to work when two states cooperate. Many analysts, however, point out that part of the dam’s submergence area falls inside the Panna Tiger Reserve, a notable habitat of the tiger and of vultures and gharials in the Ken. A considerable number of families would also need resettlement. The project received approval from the Union Cabinet in December 2021 and has since moved into the implementation phase, and its progress is widely seen as a test case for the larger programme.
Promised Benefits
The proponents of river interlinking list several benefits, which arise from the same infrastructure being used for multiple purposes.
- Irrigation: Additional canal water for millions of hectares in rain-shadow and drought-prone areas, reducing dependence on erratic monsoons and overworked groundwater.
- Drought mitigation: Assured water for villages and towns that currently depend on tankers during summer.
- Flood moderation: Storage dams and diversion canals in the Ganga-Brahmaputra system could absorb part of the peak flows that devastate Assam, Bihar and eastern Uttar Pradesh.
- Hydropower: Many of the proposed dams have power stations, and the project is often described as adding clean energy capacity.
- Navigation and fisheries: Canals could serve as inland waterways and support aquaculture.
- Drinking and industrial water: A secure supply for cities and industrial belts.
Official documents have projected large increases in irrigated area and power generation if the full programme were completed. These are long-term estimates that depend on many assumptions, and they should be understood as planning projections rather than guaranteed outcomes.
Environmental, Social and Economic Concerns
Critics, including hydrologists, ecologists and social scientists, have raised concerns that deserve to be understood alongside the benefits.
Ecological risks
Rivers are living systems whose flow regime shapes floodplains, wetlands, estuaries and fisheries. Diverting large volumes may reduce the freshwater that reaches deltas, weaken the natural flushing of sediment and salt, and alter fish migration. Linking two basins may also introduce species from one river system into another. Dams and canals can fragment forests and wildlife corridors.
Displacement and livelihoods
Reservoirs submerge villages and farmland. Studies of past large dams in India show that rehabilitation has often been slow and unsatisfactory, and forest-dwelling and tribal communities have been disproportionately affected. Any large link must therefore reckon with questions of fair compensation and resettlement.
Economic and technical questions
- The total cost of the programme is very large, and cost overruns are common in big irrigation projects.
- Experts debate how much water is truly surplus, since climate change is altering rainfall and glacial melt patterns.
- Some argue that cheaper alternatives, such as better irrigation efficiency, watershed management, groundwater recharge and the revival of local water bodies, may deliver comparable benefits.
- Water-intensive crops in canal commands can lead to waterlogging and salinity if drainage is not provided.
Legal, Federal and International Dimensions
Under the Constitution, water supply, irrigation and canals are State subjects, while the Union can regulate and develop inter-state rivers to the extent Parliament declares by law. This division means that river interlinking depends heavily on the consent of the states involved. A state that is the donor of a link may worry about giving up water it may need in future, whereas a recipient state wants a firm and timely assurance of supply.
Inter-state disputes
Inter-state river water disputes are handled under the Inter-State River Water Disputes Act, 1956, which provides for tribunals. Long-running disputes such as those over the Cauvery and the Krishna show how difficult agreements can be. Linking rivers adds a further layer, because links change the apparent availability of water in several basins at once.
The Supreme Court’s role
The Supreme Court has taken an interest in the matter. In 2002 it observed that linking rivers might be a national priority, and in a judgment delivered in 2012 it directed the Union government to constitute a committee for the interlinking of rivers and to proceed in a time-bound manner. The government has since described the committee as an important coordination forum.
Neighbouring countries
The Himalayan component touches rivers shared with Nepal, Bhutan and Bangladesh. Bangladesh, as the lower riparian state of the Ganga and Brahmaputra, has expressed concern about the possible effect of upstream diversions on dry-season flows. India has said that its projects will respect its treaty obligations and that cooperation will be pursued through consultation. The topic therefore combines hydrology with diplomacy.
Status and the Road Ahead
Although the NRLP was conceived in the 1980s, progress on the ground has been gradual. Feasibility reports have been prepared for many links, while consensus among states has been reached on only a few. Ken-Betwa is the best-known case in which an agreement among the states has led to a project moving ahead. Others, such as the Parbati-Kalisindh-Chambal and the Damanganga-Pinjal links, are being worked on through agreements among the concerned states. Some links within a single state, such as certain schemes in Andhra Pradesh and Telangana, are being implemented as intra-state projects that do not need the same level of inter-state consensus.
The way forward will depend on several factors: willingness of states to agree on sharing, a rigorous assessment of environmental and social effects, updated hydrological studies in the light of climate change, and a transparent process of consultation with those who would be displaced. Many experts suggest that interlinking should be seen as one tool among many, to be combined with efficient water use, groundwater management and the restoration of traditional water systems rather than treated as a cure-all.
Conclusion
River interlinking addresses a real problem: India’s water is plentiful in some places and scarce in others, and climate variability is making the contrast sharper. The National River Linking Project offers a large-scale engineering answer and has the backing of a long planning tradition, of the NWDA and of judicial attention. At the same time, its environmental, social, financial and federal challenges are significant. How the Ken-Betwa project performs, and how well it balances people, wildlife and water, will shape the future of the wider programme.
Frequently Asked Questions
What is the river interlinking project of India?
It is the National River Linking Project, a long-term plan to connect rivers through canals and reservoirs so that surplus water from some basins can be transferred to water-short regions. It has a Himalayan component and a Peninsular component and covers roughly 30 proposed links.
Which agency plans the river-linking schemes?
The National Water Development Agency (NWDA), set up in 1982 under the Ministry of Jal Shakti, carries out surveys, prepares feasibility reports and detailed project reports, and helps states reach agreements on each link.
Which was the first link to be implemented under the project?
The Ken-Betwa Link Project, connecting two Yamuna tributaries in Madhya Pradesh and Uttar Pradesh, is the flagship and the first link to be taken up for implementation. The Union government and the two states signed an agreement for it on 22 March 2021.
What benefits are expected from interlinking rivers?
Proponents expect additional irrigation, assured drinking water, drought relief, some flood moderation, hydropower generation and inland navigation. These are planning projections, and actual results depend on design, cost, hydrology and implementation.
Why is river interlinking controversial?
Critics cite the risk of ecological damage, loss of forests and wildlife habitat, the displacement of communities, high costs, uncertainty about how much water is truly surplus, and the difficulty of agreeing on sharing among states and with neighbouring countries such as Bangladesh and Nepal.
Is water a Union or a State subject in India?
Water supply, irrigation and canals are State subjects under Entry 17 of the State List, while the regulation and development of inter-state rivers can be taken up by the Union under Entry 56 of the Union List. This is why river interlinking needs cooperation between the Centre and the states.
