The concept of transferring water from hydrologically surplus river basins to water-deficit geographical zones was first conceived globally by Arthur Cotton in the 19th century to boost navigation and irrigation across British India. In the post-independence era, K.L. Rao (former Irrigation Minister) proposed a National Water Grid to link the Ganga and Cauvery rivers, while Captain Dinshaw Dastur suggested a “Garland Canal” system. Building on these proposals, the Ministry of Water Resources formulated the National Perspective Plan (NPP) in 1980. The National Water Development Agency (NWDA) was established in 1982 to systematically study and implement this mega-engineering project, which is currently overseen by the National Interlinking of Rivers Authority (NIRA).
Structural Architecture of the National Perspective Plan
The National Perspective Plan divides the Inter-Linking of Rivers (ILR) program into two distinct hydrological components, encompassing a total of 30 proposed river links.
The Himalayan Component
This component encompasses 14 proposed river link canals designed to build large storage reservoirs on the principal tributaries of the Ganga and Brahmaputra rivers in India, Nepal, and Bhutan. The structural objective is to transfer surplus monsoonal flows westward to the Yamuna, Indus, and Sutlej basins, while simultaneously augmenting flows in the southern peninsular systems. It also aims to provide extensive flood mitigation across the flood-prone plains of Assam, Bihar, and West Bengal.
The Peninsular Component
This component comprises 16 proposed river link canals divided into four distinct sub-sections. It focuses on diverting surplus waters from the Mahanadi and Godavari rivers to water-short southern basins like the Krishna, Pennar, Cauvery, and Vaigai. It also covers the linking of west-flowing rivers north of Mumbai and south of the Tapi river, the inter-linking of the Ken and Betwa rivers, and the diversion of partial flows from west-flowing streams of the Western Ghats eastward into rain-shadow zones.
Comprehensive Status Matrix of Core Inter-Linking Projects
The following table provides a detailed overview of the prioritized and operational inter-linking river projects under the National Perspective Plan.
| Inter-Linking Project | Donor Basin / River | Recipient Basin / River | Current Implementation Status & Key Structural Facts |
| Ken-Betwa Link (Phase I & II) | Ken River (Madhya Pradesh) | Betwa River (Uttar Pradesh) | India’s first operationalized ILR project. Features the Daudhan Dam and a 221-km canal. It transfers surplus water to irrigate the drought-prone Bundelkhand region; faces environmental challenges due to submergence within the Panna Tiger Reserve. |
| Kosi-Mechi Link | Kosi River (Bihar) | Mechi River (Mahananda Tributary) | Approved as a National Project with 90% central funding. It diverts surplus water from the volatile Kosi River to the Mechi River in northeastern Bihar, providing flood relief to Seemanchal and irrigating Araria, Purnia, and Kishanganj districts without reservoir construction. |
| Godavari-Krishna Link | Godavari River | Krishna River | Executed in Andhra Pradesh via the Pattiseema Lift Irrigation Scheme. It diverts surplus monsoon water from the Godavari at Polavaram to the Prakasam Barrage on the Krishna River, stabilizing irrigation in the water-stressed Krishna Delta. |
| Par-Tapi-Narmada Link | Western Ghats streams (Par, Tapi) | Narmada Basin | Designed to divert surplus water from the Western Ghats to water-deficit areas of North Gujarat and Kutch; implementation has faced localized tribal protests regarding displacement. |
| Daman Ganga-Pinjal Link | Daman Ganga River | Pinjal River | Inter-state project between Maharashtra and Gujarat designed to augment domestic drinking water supply to the Mumbai Metropolitan Region by tapping surplus coastal flows. |
| Mahanadi-Godavari Link | Mahanadi River | Godavari River | The apex link of the Peninsular component. It acts as the primary feed channel that enables the downstream transfer of water from the Mahanadi to the Godavari, and subsequently to the Krishna, Pennar, and Cauvery. |
Hydrological and Geo-Ecological Rationales
Rectifying Spatial and Temporal Water Disparity
India receives nearly 80% of its annual precipitation during the four months of the Southwest Monsoon (June to September), concentrated heavily in the northern and eastern regions. The ILR program aims to establish a balancing mechanism, routing water from areas experiencing chronic monsoonal flooding (such as the Brahmaputra and Kosi plains) to arid, rain-shadow geographic zones (such as western Rajasthan, Bundelkhand, and Rayalaseema) that face persistent droughts.
Enhancing Culturable Command Area and Food Security
The completion of all 30 links is projected to add approximately 35 million hectares to India’s total irrigated landmass. This expansion would significantly decrease agricultural reliance on the monsoon, reduce the unsustainable drafting of underground aquifers, and bolster national food security for the projected population demands.
Clean Energy and Inland Waterways Navigation
The structural design of the ILR reservoirs incorporates an aggregate potential to generate 34,000 megawatts of clean hydroelectric power. Furthermore, the massive link canals are engineered to satisfy the depth and width criteria required to develop integrated inland navigation routes, expanding the network of National Waterways and lowering freight logistics costs.
Ecological Vulnerabilities and Administrative Bottlenecks
Inter-State Geopolitics and Constitutional Friction
Under the Seventh Schedule of the Constitution of India, Water is listed under Entry 17 of the State List, while Inter-State Rivers fall under Entry 56 of the Union List. Because states retain primary territorial control over water use, downstream states routinely object to upstream diversions, and donor states contest the definition of “surplus” water within their boundaries. This conflict is evident in the water sharing disputes surrounding the Cauvery, Krishna, and Mahadayi basins.
Ecological Fragmentation and Wildlife Displacement
Constructing mega-dams and cross-country link canals alters the natural hydrology of river systems, obstructing the migration routes of aquatic fauna like the Ganges River Dolphin (Platanista gangetica). On land, the projects can cause severe habitat fragmentation. For example, the Ken-Betwa link requires submerging a significant portion of the core habitat of the Panna Tiger Reserve, disrupting critical wildlife corridors.
Sedimentation Alterations and Deltaic Retreat
Diverting river waters significantly reduces downstream discharge and sediment load. This alteration can cause a retreat of river deltas, accelerate coastal erosion, and destroy fragile mangrove ecosystems, such as the Sundarbans or the Bhitarkanika wetlands, due to increased salinity ingress from the sea.
Socio-Economic Displacement and Rehabilitation Costs
The construction of massive reservoirs and thousands of kilometers of concrete-lined canals requires the acquisition of extensive agricultural and tribal forest lands. This process results in the displacement of millions of rural inhabitants, creating long-term socio-economic challenges regarding equitable rehabilitation, compensatory land allocation, and livelihood restoration.
High-Yield Fact File and Hydrological Trivia
The National Project Funding Blueprint
When an inter-linking project is formally designated as a National Project by the Union Cabinet (such as the Kosi-Mechi link), the Central Government finances 90% of the project’s total cost through direct central grants, reducing the host state’s financial burden to 10%.
The Ken-Betwa Flow Direction
Geographically, both the Ken and Betwa rivers originate in the Malwa Plateau of Madhya Pradesh and flow northward to join the Yamuna River as right-bank tributaries. The link canal runs from east to west, routing water from the Ken basin in MP to the Betwa basin in UP.
The Concept of “Virtual Water” Checks
Economists and hydrologists challenge the structural necessity of certain river links by highlighting India’s high “virtual water” exports. This occurs when water-stressed regions like Punjab or Maharashtra grow and export highly water-intensive cash crops like basmati rice and sugarcane, effectively exporting localized water resources.
Ground-Truthing via the Bhuvan Portal
The National Water Development Agency uses ISRO’s Bhuvan satellite platform to perform advanced geospatial mapping, digital elevation modeling, and real-time monitoring of land-use changes across active canal alignment zones.
Last Modified: June 6, 2026