As the onset of El Niño alters global weather patterns, Sri Lanka finds itself caught in a hydrological paradox. While excessive rains deluge certain districts, causing sudden flash floods and landslides, vast stretches of the country are drying up at an alarming rate. According to recent figures from the Disaster Management Centre, over 115,000 people across seven districts are suffering severe drinking water shortages. In Monaragala, Batticaloa, and Badulla, families are queuing up under a blistering sun for basic drinking water delivered by fleet after fleet of emergency bowsers.
While emergency water trucks provide an indispensable lifeline during acute dry spells, delivering drinking water in bowsers to remote villages is an expensive and unsustainable band-aid. A few litres per household per day may keep immediate thirst at bay, but it cannot sustain livestock, agriculture, or long-term community health. As climate change transforms once-predictable weather cycles into severe swings between flood and drought, we must move beyond reactive crisis management. We need a forward-looking national policy that treats water management as a permanent pillar of national security.
This hydrological challenge is not entirely new to our island, but something our ancestors responded with vision. More than fifteen centuries ago, King Dhatusena oversaw one of the greatest engineering feats of the ancient world: the construction of the Yodha Ela. Stretching over 87 kilometres with an astonishingly gentle gradient of just ten centimetres per kilometre, this magnificent canal transported the diverted waters of the Kala Wewa across arid terrain to feed the Tissa Wewa in Anuradhapura. Furthermore, our historical hydraulic civilisation crafted the Ellanga system, a network of cascading village tanks designed to capture every drop of monsoon rain, filter it naturally, and recharge shallow groundwater tables across the dry zone.
If ancient engineers could achieve such wonders with simple tools and gravity, what should we be able to accomplish today with modern technology and scientific knowhow?
The answer lies in building a modern, interconnected hydrological grid that learns from history. The core issue in Sri Lanka today is not a complete absence of rainfall across the island, but rather its spatial and temporal imbalance. When heavy rains batter the wet zone, millions of cubic metres of freshwater spill unused into the ocean. By utilising modern Tunnel Boring Machines, Sri Lanka can construct deep subterranean transfer conduits to divert surplus water from wet-zone river basins toward the drying reservoirs of the eastern and southern provinces. Underground tunnels protect precious water from solar evaporation during transport, ensuring that excess rain in one region directly cushions another against drought.
However, massive civil engineering projects alone cannot reach every isolated community. Policy must also focus on decentralised, local interventions. In inland districts like Monaragala, deep hydro-geological mapping can identify fractured bedrock aquifers capable of holding vast underground reserves. Through Managed Aquifer Recharge programmes, monsoon floodwaters can be directed deep into these natural subterranean vaults. Unlike surface reservoirs, underground aquifers do not lose water to high temperatures during El Niño dry spells. Meanwhile, in coastal regions such as Batticaloa, deploying solar-powered Reverse Osmosis purification units can transform brackish groundwater into clean, reliable drinking water without placing extra strain on the national power grid.
At the same time, policy must mandate the urgent restoration of our ancient cascading tank systems. Decades of neglect and siltation have drastically reduced the storage capacity of rural tanks. Desilting these reservoirs, restoring destroyed catchment forests, and clearing ancient feeder canals will restore the natural hydro-balance of rural landscapes, ensuring that shallow village wells remain viable even through extended dry seasons.
Finally, modernising our water infrastructure requires digital intelligence. Implementing automated sensor networks and real-time hydrological modelling will allow authorities to predict local shortages weeks before they happen, enabling precise reservoir releases and targeted conservation measures.
El Niño is a clear warning that climate change has arrived at our doorstep. Sri Lanka cannot afford to rely indefinitely on bowser distribution whenever the monsoon fails. By uniting the visionary spirit of King Dhatusena with modern subterranean engineering, smart grids, and localised aquifer storage, we can transform our water strategy. We have the historical precedent, and we have the scientific capability. What we need now is the decisive political will to build a water-secure future for all Sri Lankans.