Major dams & multi-purpose projects

Story hook

On 22 October 1963, Prime Minister Jawaharlal Nehru stood at the base of an unfinished concrete wall in Punjab and called it a "temple of modern India". The wall was Bhakra Dam — at 226 m the second-highest gravity dam in Asia at the time — and Nehru's phrase became the founding metaphor for an entire generation's infrastructure imagination. Behind it, Gobind Sagar Lake would eventually stretch 90 km across the Sutlej valley and irrigate ~10 million acres of land across Punjab, Haryana, and Rajasthan. The same year construction began at Bhakra (1948), monsoon floods killed 2,000 people in Odisha; the response was Hirakud, then the world's longest earthen dam at 25.8 km, inaugurated in 1957 across the Mahanadi.

But the temple metaphor cuts both ways. Sardar Sarovar on the Narmada, conceived in 1961, did not impound water until 2017 — 56 years of litigation, protests led by Medha Patkar's Narmada Bachao Andolan, and a 2000 Supreme Court verdict that allowed construction to resume only with rehabilitation guarantees. Tehri (India's tallest at 260.5 m) submerged the 125-year-old town of Tehri in 2006 despite seismic concerns in Zone IV. The 2024 Wayanad landslides and 2023 Joshimath subsidence have sharpened a question Nehru never had to answer: are large dams still temples, or have they become mausoleums of a 20th-century development idea?

This file maps the seven canonical multi-purpose river-valley projects — their rivers, states, capacities, and the irrigation + power benefits they deliver — and the controversies that surround them. UPSC Prelims has tested matching-pairs of dam-river-state six times in the last ten years; Mains GS-I and GS-III routinely demand a balanced cost-benefit appraisal.

Why this matters for UPSC

Multi-purpose river projects appear in GS-I (geography of India) and GS-III (infrastructure, energy) with matching-pairs items asked in 2017, 2018, 2020, 2022, 2023, 2024. Mains has demanded cost-benefit analyses (2014, 2019, 2023). Interview boards probe inter-state water disputes (Cauvery, Krishna, Narmada) where these dams sit at the heart of the conflict. Honest weighting: factual recall is high-yield, analytical depth is needed for GS-III answers.