Not many years ago, river linking was a concept but it is becoming a reality in the country. Discuss the advantages of river linking and its possible impact on the environment.

Introduction: Interlinking of rivers means transferring water from basins judged to be in surplus to those in deficit through a network of dams, canals and reservoirs. Conceived under the National Perspective Plan and steered by the National Water Development Agency, it has now moved from blueprint to construction.

Advantages:

• Water security and irrigation: moving "surplus" monsoon water to chronically drought-prone regions such as Bundelkhand expands assured irrigation and drinking-water supply.
• Flood and drought balancing: diverting flood flows of the Ganga and Brahmaputra can reduce devastating floods in the east while relieving scarcity in the water-short west and south.
• Co-benefits: additional hydropower generation, year-round inland navigation and inland fisheries.

Environmental impacts: Large new dams and long canals submerge land and forests — the Ken-Betwa link, for example, affects part of the core of the Panna Tiger Reserve. Inter-basin transfer can disturb river ecology and fish migration, cut the natural silt load that nourishes deltas, dry out wetlands and estuaries downstream, and even alter local rainfall by changing land-atmosphere feedback. The very premise that a basin has "surplus" water is itself contested by many hydrologists.

Conclusion: The gains in water and food security are real, but so are the ecological and social costs. A case-by-case, science-led approach — backed by rigorous environmental impact assessment, sound basin studies and firm biodiversity safeguards — should decide which links proceed and how.