Saving India's groundwater future (Image: Chemetrics)
Every summer, groundwater dominates headlines as wells run dry and cities scramble for water. But by the time the crisis becomes visible, the opportunity to prevent it has already passed.
The first monsoon showers have once again transformed India’s landscape. Rivers are swelling, reservoirs are filling and, in many parts of the country, floodwaters are displacing families and inundating farmland. As attention shifts from drought to deluge, one critical aspect of India’s water security quietly slips out of public conversation: groundwater.
Groundwater irrigates nearly two thirds of India’s irrigated agricultural land and supplies about 85% of rural domestic water needs. For most Indians, groundwater becomes news only when it runs out. Images of dry borewells, long queues for tankers and falling water tables dominate the peak summer months. Once the rains arrive, the assumption is that the crisis has been resolved.
Hydrologists say that assumption is misleading. The monsoon is not the end of India’s groundwater story; it is the beginning. Decisions made during these few months determine whether aquifers recover sufficiently to support drinking water, irrigation and ecosystems through the long dry season that follows.
This distinction is becoming increasingly important as climate change alters the character of India’s rainfall. Rather than steady showers spread over weeks, many regions are witnessing shorter spells of intense rainfall interspersed with long dry periods. While total seasonal rainfall may remain close to average, its ability to recharge groundwater is becoming far less predictable.
The impact of climate change on groundwater recharge in India is not yet fully understood, and the picture varies across the country. Research suggests that groundwater recharge depends not just on how much rain falls but also on the intensity of that rainfall. A national-scale study found that in the alluvial aquifers of north and north-central India, recharge is largely driven by gentle, low-intensity monsoon rains, which have been declining over recent decades. In contrast, the hard rock aquifers of southern India rely more on high-intensity rainfall, which has become more frequent in many areas.
As a result, climate change is unlikely to affect groundwater uniformly. While some regions may experience reduced recharge, others could see improvements, depending on how local rainfall patterns evolve. In both cases, however, demand for groundwater is expected to rise as climate change increases pressure on agriculture and water supplies, making sustainable groundwater management more important than ever.
The result is a growing disconnect between seasonal rainfall and groundwater availability. This paradox is evident across several parts of India. Districts receiving above-normal rainfall have continued to report declining groundwater levels, while regions that have invested in watershed restoration, recharge structures and better water management have shown greater resilience even under variable rainfall conditions.
A farmer of Gajewas village in Patiala has got three borewells dug in 15 years. (Image: India Water Portal)
The challenge is not simply storing more water in reservoirs. It is learning how to store more water underground. Groundwater acts as India’s largest natural freshwater reserve. Unlike surface reservoirs, aquifers experience minimal evaporation losses and provide a reliable source of water during prolonged dry periods. Yet groundwater rarely features in discussions on monsoon management.
Flood management and groundwater management continue to be planned largely as separate sectors. Floodwaters are often treated as excess water that must be drained away quickly. But researchers increasingly argue that, where geological conditions permit, some of these excess flows could instead become an opportunity for aquifer recharge.
Nature-based approaches to groundwater recharge are also gaining prominence globally. Managed aquifer recharge (MAR) is increasingly being used to capture surplus water during wet periods and store it underground for use during dry seasons. In California, for example, the Flood-MAR initiative intentionally diverts floodwaters onto suitable landscapes to replenish aquifers while reducing flood risks. In India, approaches such as MAR and the Underground Transfer of Floods for Irrigation (UTFI) apply similar principles by channelling excess monsoon flows into suitable aquifers, creating underground water reserves that can later support irrigation during dry months. Unlike large dams, these approaches work with natural geological systems, enhancing groundwater storage while helping reduce flood risks in appropriate locations.
The broader lesson is that flood resilience and groundwater security need not be competing objectives. Equally important is how water is used during the monsoon and post-monsoon season. Agriculture accounts for nearly 90% of groundwater withdrawals in India. More efficient irrigation practices, better scheduling of water use, crop diversification and improved management of surface and groundwater together can reduce pressure on aquifers before the dry season begins.
This requires moving beyond a simplistic focus on annual rainfall totals. India’s water future will depend increasingly on understanding how much of the monsoon actually becomes groundwater and how that varies across regions and over time. The Central Ground Water Board’s (CGWB) annual Groundwater Resource Estimation (GWRE) is an important step in this direction, providing a systematic assessment of groundwater recharge, availability and extraction to support better planning and management.
Advances in remote sensing, hydrological modelling and decision support systems are making groundwater monitoring more effective. At the same time, India is significantly strengthening its groundwater observation network through the Central Ground Water Board (CGWB), including the installation of thousands of new automated piezometers with telemetry under the National Aquifer Mapping and Management Programme (NAQUIM). Together, these investments are providing more timely, accurate and spatially detailed information to support groundwater management and planning.
Solar irrigation can help conserve groundwater, but solutions must fit local realities. (Image: IWMI)
The challenge is not a lack of rainfall alone. It is whether landscapes, institutions and policies are capable of capturing the water that arrives. As climate extremes intensify, India can no longer afford to think of floods and droughts as separate problems occurring in different seasons. They are increasingly two expressions of the same water management challenge.
Managing floods, droughts and groundwater in isolation is a missed opportunity. Integrating these challenges can help capture excess monsoon water where appropriate, replenish aquifers, reduce flood risks and improve water security during the dry season, while ensuring that rivers and downstream ecosystems continue to receive the flows they need.
By the time groundwater returns to newspaper headlines in April or May, the most important decisions will already have been made months earlier, during the monsoon. Perhaps that is the country’s biggest groundwater blind spot. The season that appears to end the water crisis is, in reality, the one that determines whether the next crisis can be avoided.