River Interlinking in India: Potential, Concerns and Sustainable Alternatives

Why in News?

The union home minister has proposed linking major rivers from the Brahmaputra to the Godavari and Cauvery to address long-term water scarcity. However, unresolved inter-State disputes, ecological risks, displacement and limited progress in existing projects have renewed debate over the feasibility of large-scale river interlinking

What is Interlinking of Rivers?

• The Interlinking of Rivers (ILR) programme is a large-scale water-management initiative that seeks to transfer water from water-surplus basins to water-deficit regions.
• The transfer is proposed through a network of reservoirs, dams, canals and diversion structures.
• The programme is based on the assumption that some river basins have surplus water that can be transferred to regions experiencing shortages.

Inter-basin Water Transfer

• Inter-basin water transfer means moving water across the natural boundary of one river basin into another.
• Supporters view it as a way to redistribute water, while critics question whether a river basin can be permanently classified as surplus because water availability changes across seasons and years.

Historical Background

• The idea of linking Indian rivers dates back to the 19th century, when Sir Arthur Cotton proposed river-based irrigation and navigation projects.
• The proposal gained attention after Independence due to India’s uneven rainfall distribution and recurring floods and droughts.
• In 1980, the Ministry of Water Resources formulated the National Perspective Plan for interlinking rivers.
• The National Water Development Agency (NWDA) was established in 1982 to examine the feasibility of river-linking projects.

National Perspective Plan

• The National Perspective Plan identified 30 major river links.
• These are divided into two components: 14 links under the Himalayan component and 16 links under the Peninsular component.

Himalayan Component

• It broadly seeks to link rivers originating in the Himalayan region and transfer water across northern and eastern river basins.

Peninsular Component

• It focuses on linking rivers in peninsular India to transfer water between relatively water-rich and water-deficit regions.

Role of the NWDA

• The NWDA studies the feasibility of river-linking proposals.
• Its work includes assessing river flows, identifying possible links and examining whether water transfers can be technically implemented.
• The agency maintains that river-link planning accounts for the need to improve or protect river flows during lean periods.

Objectives of River Interlinking

Water Security

• The programme seeks to transfer water from relatively water-rich basins to water-deficit areas and reduce regional disparities.

Irrigation Expansion

• Additional water could expand irrigation, support crop diversification, increase agricultural productivity and improve farmers’ incomes.

Flood and Drought Management

• Supporters argue that excess water during floods could be diverted to water-scarce regions, reducing the impact of floods and droughts.

Drinking and Industrial Water

• Inter-basin transfers could improve water availability for cities, industries and rural communities facing shortages.

Hydropower Generation

• Reservoirs and related infrastructure may provide opportunities for generating hydropower.

Balanced Regional Development

• Improved irrigation, water supply, navigation and rural infrastructure could support employment and economic development in water-deficit regions.

Integrated River-basin Management

• River interlinking may encourage coordinated planning of water resources across political and administrative boundaries.

Inter-State Water Disputes in Southern India

• Several southern rivers flow through more than one State, resulting in disputes over dams, irrigation projects, reservoir operations and water sharing during periods of scarcity.
• The delay in resolving existing disputes demonstrates the difficulty of achieving the level of inter-State cooperation required for large-scale river interlinking.

Pennaiyar River Dispute

• Tamil Nadu requested the Union government in November 2019 to constitute a tribunal for adjudicating its Pennaiyar river dispute with Karnataka.
• Tamil Nadu alleged that Karnataka had violated the 1892 inter-State agreement and also approached the Supreme Court.
• Two negotiation committees were constituted and 11 meetings were held, but the dispute remained unresolved.
• The Supreme Court directed the Centre to constitute a tribunal and later extended the deadline by six months. However, the tribunal had not been established at the time covered by the source.

Proposal to Use the Mahadayi Tribunal

• The Union government asked whether the Pennaiyar dispute could be referred to the Mahadayi Water Dispute Tribunal instead of constituting a separate tribunal.
• The Pennaiyar and Mahadayi disputes concern different river systems and geographical regions.
• The article argues that such a transfer is not permitted under the Inter-State River Water Disputes Act, 1956.

Mekedatu Project Dispute

• Karnataka’s proposed Mekedatu dam project has faced opposition from Tamil Nadu over concerns about downstream water availability.
• Tamil Nadu requested the Union government in March 2026 to constitute a tribunal on the project.
• The Centre had not responded to this demand at the time covered by the source.

Arguments in Favour of River Interlinking

Improving Agricultural Productivity

• Additional irrigation could increase agricultural output, support crop diversification and improve farmers’ incomes.
• The Indira Gandhi Canal Project helped expand irrigation and agriculture in arid parts of Rajasthan.

Enhancing Water Security

• Water could be transferred from relatively water-rich basins to drought-prone and water-deficit regions.
• The Ken–Betwa Link Project, for example, aims to provide irrigation and drinking water to the Bundelkhand region of Madhya Pradesh and Uttar Pradesh.

Managing Floods and Droughts

• Diversion of excess water during high-flow periods could reduce flood pressure while supporting water-scarce regions.
• Proponents argue that this could improve India’s long-term water resilience.

Supporting Urban and Industrial Needs

• Inter-basin transfers can help meet the drinking-water requirements of expanding cities.
• The Krishna Water Supply Project transfers Krishna river water to meet Hyderabad’s drinking-water needs.

Reducing Regional Imbalances

• Transferring water to dry regions could promote settlement, agriculture and economic development in areas with limited natural water availability.

Arguments Against River Interlinking

Difficulty in Identifying Surplus Water

• A river may carry excess water during a good monsoon but experience scarcity during a weak rainfall year.
• Calculations based on average flows may not accurately reflect seasonal variations, drought years or future climate conditions.

Climate-change Uncertainty

• Climate change is altering rainfall patterns, glacier behaviour and river flows.
• These changes make assumptions about permanent water-surplus and water-deficit basins increasingly uncertain.

Ecological Effects

• River ecosystems are interconnected. Changing natural flows can affect aquatic biodiversity, fish migration, wetlands, sediment transport, groundwater recharge and downstream ecosystems.
• Diversions may also alter the ecological balance of donor and recipient river basins.

Impact on the Vembanad Wetland

• Kerala opposes the Pamba–Achankovil–Vaippar Link Project.
• It argues that diverting water from the Pamba and Achankovil rivers could harm the Vembanad wetland ecosystem, into which these rivers drain.

Claims During Distress Years

• Recipient regions may begin to treat transferred water as a permanent entitlement.
• They may continue demanding water during drought years, potentially reducing supplies available to the original basin.

Inter-State Water Conflicts

• Rivers are shared by multiple States, making allocation politically sensitive.
• The Pennaiyar and Mekedatu disputes demonstrate the difficulty of securing agreement on river-water use.

Land Acquisition and Displacement

• Large dams, canals and reservoirs require extensive land.
• Such projects may displace local and tribal communities and affect livelihoods, cultural connections and access to natural resources.

Economic and Technical Difficulties

• River-linking projects involve high financial costs, complex engineering, continuous maintenance and long gestation periods.
• Growing resistance to land acquisition can further delay implementation.

Diversion from Sustainable Alternatives

• Excessive dependence on mega engineering projects may reduce attention to water conservation, watershed development, groundwater management and efficient use.

Successful Inter-basin Transfer Projects

Mullaperiyar Dam Project

• The project involves Kerala and Tamil Nadu.
• Water from the Periyar basin in Kerala is diverted to the Vaigai basin in Tamil Nadu for irrigation and drinking-water purposes.
• It has supported agriculture in the drought-prone regions of Tamil Nadu.

Parambikulam–Aliyar Project

• The project involves Kerala and Tamil Nadu.
• It is a multi-reservoir inter-State project that diverts waters from rivers of the Western Ghats to provide irrigation benefits in Tamil Nadu.
• It represents cooperation between States in sharing river water.

Krishna Water Supply Project

• The project is associated with Maharashtra, Karnataka, Telangana and Andhra Pradesh.
• It transfers Krishna river water to meet the drinking-water requirements of Hyderabad.
• It demonstrates the use of inter-basin transfers to address urban water shortages.

Indira Gandhi Canal Project

• The project involves Punjab, Haryana and Rajasthan.
• It transfers water from the Sutlej–Beas river system to the arid regions of Rajasthan.
• It transformed parts of the Thar Desert by expanding irrigation, agriculture and settlement.

Limited Number of Projects

• India has implemented only a handful of major inter-basin water-transfer projects during the last 130 years.
• Their limited number demonstrates the technical, financial, political and social difficulties involved.

Status of River-linking Efforts

• After returning to power in 2014, the Union government constituted a Special Committee for Interlinking of Rivers.
• The committee has held more than two dozen meetings.
• Despite these meetings, the national river-linking programme has made limited progress.
• Major barriers include State consent, water-sharing arrangements, environmental concerns, land acquisition, rehabilitation and questions over surplus-water availability.

Ken–Betwa Link Project

• The project seeks to transfer water from the Ken basin to the Betwa basin.
• It aims to provide irrigation and drinking-water benefits to drought-prone Bundelkhand in Madhya Pradesh and Uttar Pradesh.
• In 2024, the Prime Minister laid the foundation stone for the ₹44,000-crore project.
• The project has faced protests from tribal communities in Chhatarpur over displacement, environmental effects and loss of traditional livelihoods.
• It shows that technical and financial approval alone cannot ensure ecological sustainability or social acceptance.

Supply-side and Demand-side Approaches

Supply-side Approach

• A supply-side approach tries to increase water availability through dams, reservoirs, canals and inter-basin transfers.
• River interlinking follows this approach because it transports additional water to areas experiencing shortages.

Demand-side Approach

• Demand-side management focuses on conserving existing water, reducing wastage and improving water-use efficiency.
• It includes micro-irrigation, groundwater conservation, rainwater harvesting, watershed management and restoration of traditional water bodies.
• It also involves sensitising and incentivising farmers to use irrigation water efficiently.
• The article argues that governments and civil society should prioritise demand management instead of continuously depending on mega supply-side projects.

Challenges

Federal and Governance Challenges

• States may disagree over surplus-water calculations, project designs, costs and allocation arrangements.
• Delays in creating tribunals and implementing decisions weaken dispute-resolution mechanisms.

Ecological Challenges

• Altered river flows may affect biodiversity, wetlands, sediment movement, groundwater recharge, fisheries and downstream ecosystems.
• Climate change makes long-term water-availability estimates increasingly uncertain.

Social Challenges

• Large projects can displace local and tribal communities.
• Fair compensation, rehabilitation and livelihood restoration remain difficult.

Economic and Technical Challenges

• Mega projects involve high financial costs, complex engineering, long construction periods and continuous maintenance.
• Extensive land acquisition can delay projects and increase opposition.

Water-use Challenges

• Additional water may not solve scarcity if agricultural consumption remains inefficient.
• Indiscriminate groundwater extraction, including extraction encouraged by free agricultural electricity, can worsen ecological stress.

Institutional Challenges

• More than two dozen committee meetings have not produced substantial progress.
• Limited consensus among States can delay individual links and the wider programme.

Way Forward

Strengthen Water-governance Institutions

• The National River Linking Project and ILR programme should follow a scientific, transparent and participatory approach.
• The NWDA should conduct detailed basin-level studies before recommending transfers.

Improve Dispute Resolution

• Mechanisms under the Inter-State River Water Disputes Act, 1956 should be strengthened to ensure timely tribunal formation and implementation of decisions.
• The constitutional framework under Article 262 should support equitable and cooperative management of inter-State rivers.

Adopt Basin-level Planning

• Planning should consider the entire river basin, including downstream users, wetlands, ecological flows and seasonal variations.
• States, technical experts, local communities and other stakeholders should participate in decision-making.

Introduce Climate-risk Assessment

• Project planning should account for changing rainfall patterns, glacier behaviour, droughts and extreme weather.
• Surplus-water calculations should not depend only on past average flows.

Strengthen Environmental Safeguards

• Projects should undergo credible environmental-impact assessments.
• Ecological flows, aquatic biodiversity, sediment movement, groundwater recharge and downstream ecosystems must be protected.

Ensure Rehabilitation and Community Participation

• Affected communities should participate in project planning, compensation, rehabilitation and livelihood restoration.
• Tribal and local rights must be considered before land acquisition.

Prioritise Demand-side Management

• India should expand micro-irrigation, groundwater conservation, rainwater harvesting, watershed management and restoration of traditional water bodies.
• Farmers should be sensitised and incentivised to use water efficiently.

Regulate Groundwater Extraction

• Indiscriminate extraction should be curbed, particularly where free electricity encourages excessive pumping.

Examine Local Alternatives First

• Local water harvesting, aquifer recharge, efficient irrigation and restoration of tanks should be examined before approving mega transfers.

Promote Cooperative Federalism

• The Centre and States should rely on transparent data, consultation and mutually accepted water-sharing arrangements.
• Integrated river-basin management can reduce conflicts and improve long-term water security.

Conclusion

River interlinking may support water security in carefully selected cases, but it cannot be a universal solution. India needs a balanced strategy based on conservation, efficient use, groundwater management, ecological protection and cooperative federalism.