In Defense of Large Dams: Addressing India’s Water Crisis

India is a country where rain comes in bursts – concentrated in a few monsoon months, unevenly spread across a vast geography, and often unable to reach the fields and homes that need it most. Against this backdrop, the debate around large dams has never been a simple one. Critics point to displacement and ecological harm, and those concerns are real. But a parallel and equally serious question deserves attention: without large dams, how does a country of 1.4 billion people feed itself, power its cities, and find water to drink? This post examines the core arguments put forward by proponents of large dams – their logic, their evidence, and why this conversation still matters.

The scale of India’s water problem 🔗

India is on the verge of a severe water crisis, driven by rapid population growth, accelerating groundwater depletion, and the uneven geography of rainfall. Of the 140 million hectares of net cultivated land in India, only around 60 million hectares are irrigated. For agriculture to grow at the 4% annual rate needed to sustain broader economic expansion, India must either expand irrigation coverage, adopt new high-yield technology, or increase cultivable land – and the last option is essentially exhausted.

The groundwater situation is particularly alarming. Groundwater accounts for more than 60% of irrigation, 80% of rural water supply, and 40% of urban water supply in India – and it is being extracted at rates far faster than it can be replenished. In Punjab, a state central to India’s food production, roughly 80% of groundwater wells are already being exploited to critical levels. The question, then, is not whether water storage infrastructure is needed, but what kind – and at what scale.

Why proponents defend large dams 🔗

Defenders of large dams are not ignoring their costs. They are making a specific claim: that given the realistic alternatives available, large dams are the best among existing options for dealing with the crisis in irrigation, drinking water, and power. This argument has several distinct pillars.

Meeting irrigation demand at scale 🔗

Irrigation is the primary purpose of over 95% of large dams built in India. Supporters argue that irrigation is indispensable in a monsoon-dependent economy, where rainfall is concentrated in a few months and agricultural income is perpetually vulnerable to erratic weather. The evidence supports parts of this claim – command areas (those served by dam-fed canals) consistently outperform comparable non-irrigated regions in agricultural income, input use, and crop diversification.

A concrete example: the Sardar Sarovar Dam irrigates 1.9 million hectares and benefits around one million farmers, while also supplying drinking water to 29 million people across thousands of villages and towns. These are not abstract numbers – they represent the food security and daily survival of a vast population.

Proponents also highlight a key finding from drought years: it was only large dams that performed adequately for Gujarat during the last major drought. When rain fails, small-scale storage – check dams, tanks, local ponds – simply runs dry. Large reservoirs, by contrast, carry enough stored water to bridge seasons and even multi-year dry spells.

The limitations of small dam alternatives 🔗

A recurring claim in the debate is that small dams and check dams can serve as alternatives to large projects. Proponents contest this directly. The World Bank’s Agricultural Division, in its defence of the Sardar Sarovar project, identified several structural weaknesses of small dam alternatives:

First, small dams are not as cost-effective as commonly claimed. Research on small “tanks” in India found most of them to be economically unviable, partly because the ratio of land inundated to water stored is unfavorable. Typically, small tanks inundate nearly as much land as they irrigate – almost 0.9 hectares submerged per 1.0 hectare irrigated, usually supporting only a single crop cycle. Large dams, by contrast, irrigate far more land per hectare submerged and also generate power simultaneously.

Second, as planners search for the large number of small dam sites needed to store significant water volumes, they are forced to use increasingly unsuitable locations – and costs escalate sharply. Third, and critically, small dams fail most severely in dry years, precisely when they are needed most. Their storage capacity cannot buffer multi-year droughts or support the double-cropping that transforms agricultural productivity.

The same logic applies to groundwater dependency. Small dams have proved to be poor substitutes, as people continue to rely on groundwater for their most essential and regular needs – and that reliance is pushing aquifers toward collapse.

The energy argument: hydropower as renewable necessity 🔗

Beyond irrigation, large dams serve a second critical function: generating hydroelectric power. And in the context of climate change and the push away from fossil fuels, this has become an increasingly central argument for dam proponents.

With nuclear energy questioned for radiation safety risks and thermal energy dependent on non-renewable coal and gas, the argument goes that hydel power is the cheapest, cleanest, and most viable renewable energy source available at scale. Solar energy, despite rapid growth, still faces limitations in storage technology and grid reliability.

The numbers back up hydel power’s relevance. Globally, hydropower is the dominant renewable energy source, providing over two-thirds of all renewable electricity. In India specifically, the total hydropower potential is estimated at around 1,45,000 MW – and only about 26% of it has been exploited. The untapped potential is enormous, particularly in the northeastern Himalayan states.

Crucially, hydropower provides something solar and wind cannot easily offer: dispatchability. Unlike wind or solar, hydropower can be ramped up or down within minutes to balance grid load – a capability demonstrated dramatically in April 2020 when India’s grid operators used hydropower to stabilize the national grid after a sudden 31-GW demand plunge. Since 2019, the Indian government has formally classified large hydropower projects above 25 MW as renewable energy, unlocking new policy incentives and investment pathways.

The historical link between hydropower and social mobility in India is also worth noting. Access to water resources – through canals or hydropower-driven tube-wells – enabled forms of agricultural growth and social mobility across north, west, and southern India. Even B.R. Ambedkar, the economist and anti-caste thinker who served as Labour Member from 1942 to 1946, strongly advocated for dams and multipurpose reservoirs – not as symbols of nation-building, but as vehicles of socio-economic justice for marginalised communities.

Irrigation, food security, and indirect benefits 🔗

The case for large dams is not limited to direct agricultural output. A nationwide assessment conducted for India’s Central Water Commission by the National Council of Applied Economic Research (NCAER) found that indirect benefits – improvements in health outcomes, education, women’s time use, labour productivity, and livelihood diversification – account for nearly one-third of the total benefits generated by large irrigation projects. These benefits are rarely captured in conventional cost-benefit analyses, making the pro-dam case appear weaker than it actually is.

Irrigation decouples food production from climate variability and provides a cooling effect that mitigates heat stress on crops, making it a direct adaptation tool in an era of worsening climate volatility. For a country like India – where crop failures have historically triggered farmer distress and food insecurity – this buffering function is not peripheral. It is central to survival.

In the long run, dams are seen as inevitable given the limits of local water harvesting. While watershed development and check dams have a role, they cannot, by themselves, store and transport water at the scale India’s population demands. The memory of the “ship to mouth” grain imports from the United States in the 1960s remains a reference point for why India prioritises self-sufficiency in food production – and large irrigation infrastructure is seen as central to that goal.

Acknowledging the costs – without abandoning the debate 🔗

Proponents of large dams do not deny the costs. Displacement, submergence of forests, disruption of river ecology – these are real, and the pro-dam position at its most serious acknowledges them. What it argues is that the alternatives are not cost-free either. Even without large dams, deforestation in the Narmada Basin proceeded at roughly 20,000 hectares per year – driven by encroachment and commercial extraction. The notion that rejecting large dams automatically protects forests or tribal communities is complicated by the reality of development pressures that exist regardless.

Social activist Gail Omvedt, who spent decades working in drought-affected regions of central India, put it plainly: the argument is not against big irrigation projects as such, but against badly conceived ones – big projects can be sustainable and work in a decentralised manner. This is arguably where the real debate should focus: not on whether large dams should exist at all, but on how they are designed, who governs them, and how benefits are distributed.

The broader context: a development imperative 🔗

India’s challenge is not merely hydrological. India’s vast agrarian economy is closely tied to its water resources and prone to climate variability. With climate change projected to increase extreme weather events – both floods and droughts – large reservoirs may become more important as buffers, not less. Dams in the Himalaya may be an important part of the solution in preparing for extreme weather events, provided ecological trade-offs are carefully managed.

The argument for large dams, at its core, is a development argument: that a densely populated, monsoon-dependent, still-industrialising country cannot afford to leave its water resources unmanaged at scale. The question is not whether India will build water infrastructure – it is what kind, and under what safeguards. India does not need fewer dams or more dams as an article of faith; it needs better-performing dams, evaluated over their full lifecycle.

What do you think? Given that small-scale alternatives like check dams and rainwater harvesting have real limitations during drought years, is dismissing large dams outright a practical position for a country with India’s water and food security pressures? And if large dams are to be built, what governance structures would ensure their benefits reach farmers, tribal communities, and urban poor – rather than concentrating in the hands of a few?

References

1. https://www.britannica.com/technology/water-infrastructure-in-India
2. https://www.sociologydiscussion.com/water/dams-arguments-in-favour-of-large-dams-in-india/729
3. https://www.downtoearth.org.in/governance/beyond-pro-dam-vs-anti-dam-what-indias-irrigation-debate-gets-wrong
4. https://universalinstitutions.com/top-5-hydroelectric-power-plants-in-india/
5. https://www.orfonline.org/expert-speak/hydropower-in-india-an-update
6. https://powermin.gov.in/en/content/faqs-hydropower
7. https://www.historyworkshop.org.uk/environment-animals/large-dams-and-clean-energy-the-view-from-india/
8. https://www.sciencedirect.com/science/article/pii/S136403212400162X
9. https://www.nbr.org/publication/indias-water-crisis-causes-and-cures/
10. https://www.sciencedirect.com/science/article/pii/S2405844023043591