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Kelani Ganga at a crossroads: Suranjan Karunaratne warns of an unfolding crisis

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From the misty montane forests around Adam’s Peak, the Kelani Ganga tumbles down rocky headwaters, gathering tributaries before rolling past rubber estates, tea plantations, shanty towns and finally Sri Lanka’s bustling commercial capital. For centuries this 145-kilometre river has been the country’s lifeline, supplying water, fish, fertile soils and cultural meaning. Today it sustains more than six million people in the Colombo District alone.

But the river is in trouble.

Speaking to The Sunday Island, Environmental Scientist Suranjan Karunaratne of the Nature Exploration and Education Team, said; “The Kelani River has become one of the most heavily impacted river basins in Sri Lanka,” and Karunaratne has spent years documenting the basin’s ecology.

Karunaratne is not speaking off the cuff. He is co-author of a landmark review on the Kelani River published in Water (2020) with Thilina Surasinghe, Ravindra Kariyawasam and others — one of the few peer-reviewed papers to pull together the basin’s biodiversity and threats. “Our research combined published literature with our own field observations to give the most comprehensive picture yet of the river’s condition,” he explains. “What we found was alarming.”

Riparian Forests: The River’s Kidneys Under Siege

According to Karunaratne’s research team, only about 10 percent of the Kelani’s catchment remains forested. The once-continuous riparian vegetation — towering trees that shaded streams and filtered runoff — has been reduced to narrow strips of grass and scrub along Colombo’s outskirts.

“Riparian forests act as the river’s kidneys,” Karunaratne explains. “They filter sediments and nutrients, stabilise banks and regulate water temperature. When we clear them, we disable the river’s self-cleaning system.”

His study, based on Sri Lanka Survey Department data and field checks, documents how rubber and tea plantations, in the mid and upper basins, have crept into floodplains and headwaters, while urban expansion, in the lower basin, has displaced wetlands that once soaked up floods and recharged groundwater. Today, less than one percent of the basin remains wetland.

Pollution Hotspots: A Toxic Cocktail

Karunaratne and his co-authors compiled decades of water-quality data showing the lower basin now routinely fails to meet drinking-water standards. Point-source pollution is staggering: more than 6,000 factories release thermal effluents, oils, heavy metals and synthetic compounds. Biological oxygen demand in the lower reaches has been measured at 17 mg L — far exceeding safe thresholds — while pH has dropped to 5.3.

Non-point pollution is just as severe. Storm-water canals flush urban waste into the Kelani during monsoons, while fertilisers from tea, rubber and paddy fields spike nitrogen and phosphate levels, fuelling algal blooms. Ammonia in the coastal reaches already averages at the permissible limit.

Dams, Diversions and Dredging

Hydrological change compounds these chemical assaults. Karunaratne’s paper lists five major hydropower reservoirs and 32 mini-hydropower plants fragmenting the river, with another large plant under construction. “Impoundments change flow regimes, water chemistry and the physical habitat of fish,” he notes. “In some tributaries, 60 percent of their length has become dead or low-flow reaches.”

The consequences ripple through the food chain. Fish adapted to oxygen-rich rapids cannot survive these altered conditions. Migratory cyprinids find their routes blocked. Even diadromous gobies whose larvae migrate to the sea depend on unimpeded flow and intact estuarine habitats.

Karunaratne and his colleagues also documented widespread illicit water extraction and sand and gem mining, which reshape the channel and lower flows to the point that seawater now intrudes 15 km inland during droughts.

Biodiversity on the Brink

The team’s survey recorded 60 freshwater fish species in the Kelani basin — more than half of Sri Lanka’s endemic freshwater fish — along with critically endangered crabs, dragonflies and amphibians. Yet 22 fish species are nationally threatened.

Micro-endemics, such as the Bandula Barb (Pethia bandula), survive in a single tributary, while the Asoka Barb (Systomus asoka) is confined to a few foothill streams. Filling wetlands threatens swamp eels in the coastal zone. “Even occasional fish kills have been reported in lower reaches due to industrial and domestic waste discharge,” Karunaratne says.

Adding to the pressure is an invasion of alien species — tilapias, vermiculated sailfin catfish, clown featherbacks and even red-eared slider turtles. Karunaratne’s article lists more than two dozen exotics established in the basin. These species compete with native fish, prey on smaller species or eggs, and in some cases physically alter habitats.

Weak Policy, Weaker Enforcement

Sri Lanka has more than 20 governmental agencies and over 50 statutes regulating aquatic resources, yet coordination is poor and enforcement patchy. Karunaratne’s study devotes an entire section to policy gaps, noting that mandatory streamside reservations are often ignored and environmental impact assessments rarely translate into mitigatory action.

“Without science-based policymaking and inter-agency cooperation, even the best laws are just words on paper,” he laments.

A Blueprint for Recovery

Despite the grim outlook, Karunaratne believes the Kelani can still be saved if action is swift and strategic. His research paper closes with a suite of recommendations:

Reforest riparian buffers:

* Restore meanders and reconnect floodplains.

* Establish freshwater protected areas.

* Control invasive species and avoid planting alien flora.

* Evaluate the river’s ecosystem services in monetary terms to persuade policymakers.

* Invest in research and monitoring, including permanent survey stations and studies of endemic fish breeding biology.

“Kelani Ganga is not just a water source; it’s a living system that underpins Colombo’s health, economy and cultural identity,” Karunaratne says. “If we don’t act now, we risk ecological collapse and public-health crises.”

A River, a Mirror

In many ways, the Kelani reflects Sri Lanka’s development dilemma: the tension between economic growth and environmental stewardship. Its challenges echo across other tropical riverscapes in South and Southeast Asia.

But Karunaratne sees an opportunity. “If we can turn the Kelani into a model of integrated river-basin management, we can inspire conservation of other rivers,” he says. “It will take stakeholder partnerships, participatory management and a willingness to treat the river not as a drain, but as an asset.”

As the Kelani flows past tea-green hillsides and shanty-lined banks toward the sea, it carries both a warning and a hope. The warning is stark: unchecked degradation will lead to ecological collapse. The hope lies in the science and passion of people like Suranjan Karunaratne — and in society’s capacity to heed their call.

By Ifham Nizam



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Features

Ranking public services with AI — A roadmap to reviving institutions like SriLankan Airlines

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Efficacy measures an organisation’s capacity to achieve its mission and intended outcomes under planned or optimal conditions. It differs from efficiency, which focuses on achieving objectives with minimal resources, and effectiveness, which evaluates results in real-world conditions. Today, modern AI tools, using publicly available data, enable objective assessment of the efficacy of Sri Lanka’s government institutions.

Among key public bodies, the Supreme Court of Sri Lanka emerges as the most efficacious, outperforming the Department of Inland Revenue, Sri Lanka Customs, the Election Commission, and Parliament. In the financial and regulatory sector, the Central Bank of Sri Lanka (CBSL) ranks highest, ahead of the Securities and Exchange Commission, the Public Utilities Commission, the Telecommunications Regulatory Commission, the Insurance Regulatory Commission, and the Sri Lanka Standards Institution.

Among state-owned enterprises, the Sri Lanka Ports Authority (SLPA) leads in efficacy, followed by Bank of Ceylon and People’s Bank. Other institutions assessed included the State Pharmaceuticals Corporation, the National Water Supply and Drainage Board, the Ceylon Electricity Board, the Ceylon Petroleum Corporation, and the Sri Lanka Transport Board. At the lower end of the spectrum were Lanka Sathosa and Sri Lankan Airlines, highlighting a critical challenge for the national economy.

Sri Lankan Airlines, consistently ranked at the bottom, has long been a financial drain. Despite successive governments’ reform attempts, sustainable solutions remain elusive.

Globally, the most profitable airlines operate as highly integrated, technology-enabled ecosystems rather than as fragmented departments. Operations, finance, fleet management, route planning, engineering, marketing, and customer service are closely coordinated, sharing real-time data to maximise efficiency, safety, and profitability.

The challenge for Sri Lankan Airlines is structural. Its operations are fragmented, overly hierarchical, and poorly aligned. Simply replacing the CEO or senior leadership will not address these deep-seated weaknesses. What the airline needs is a cohesive, integrated organisational ecosystem that leverages technology for cross-functional planning and real-time decision-making.

The government must urgently consider restructuring Sri Lankan Airlines to encourage:

=Joint planning across operational divisions

=Data-driven, evidence-based decision-making

=Continuous cross-functional consultation

=Collaborative strategic decisions on route rationalisation, fleet renewal, partnerships, and cost management, rather than exclusive top-down mandates

Sustainable reform requires systemic change. Without modernised organisational structures, stronger accountability, and aligned incentives across divisions, financial recovery will remain out of reach. An integrated, performance-oriented model offers the most realistic path to operational efficiency and long-term viability.

Reforming loss-making institutions like Sri Lankan Airlines is not merely a matter of leadership change — it is a structural overhaul essential to ensuring these entities contribute productively to the national economy rather than remain perpetual burdens.

By Chula Goonasekera – Citizen Analyst

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Features

Why Pi Day?

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International Day of Mathematics falls tomorrow

The approximate value of Pi (π) is 3.14 in mathematics. Therefore, the day 14 March is celebrated as the Pi Day. In 2019, UNESCO proclaimed 14 March as the International Day of Mathematics.

Ancient Babylonians and Egyptians figured out that the circumference of a circle is slightly more than three times its diameter. But they could not come up with an exact value for this ratio although they knew that it is a constant. This constant was later named as π which is a letter in the Greek alphabet.

Archimedes

It was the Greek mathematician Archimedes (250 BC) who was able to find an upper bound and a lower bound for this constant. He drew a circle of diameter one unit and drew hexagons inside and outside the circle such that the sides of each hexagon touch the sides of the circle. In mathematics the circle passing through all vertices of a polygon is called a ‘circumcircle’ and the largest circle that fits inside a polygon tangent to all its sides is called an ‘incircle’. The total length of the smaller hexagon then becomes the lower bound of π and the length of the hexagon outside the circle is the upper bound. He realised that by increasing the number of sides of the polygon can make the bounds get closer to the value of Pi and increased the number of sides to 12,24,48 and 60. He argued that by increasing the number of sides will ultimately result in obtaining the original circle, thereby laying the foundation for the theory of limits. He ended up with the lower bound as 22/7 and the upper bound 223/71. He could not continue his research as his hometown Syracuse was invaded by Romans and was killed by one of the soldiers. His last words were ‘do not disturb my circles’, perhaps a reference to his continuing efforts to find the value of π to a greater accuracy.

Archimedes can be considered as the father of geometry. His contributions revolutionised geometry and his methods anticipated integral calculus. He invented the pulley and the hydraulic screw for drawing water from a well. He also discovered the law of hydrostatics. He formulated the law of levers which states that a smaller weight placed farther from a pivot can balance a much heavier weight closer to it. He famously said “Give me a lever long enough and a place to stand and I will move the earth”.

Mathematicians have found many expressions for π as a sum of infinite series that converge to its value. One such famous series is the Leibniz Series found in 1674 by the German mathematician Gottfried Leibniz, which is given below.

π = 4 ( 1 – 1/3 + 1/5 – 1/7 + 1/9 – ………….)

The Indian mathematical genius Ramanujan came up with a magnificent formula in 1910. The short form of the formula is as follows.

π = 9801/(1103 √8)

For practical applications an approximation is sufficient. Even NASA uses only the approximation 3.141592653589793 for its interplanetary navigation calculations.

It is not just an interesting and curious number. It is used for calculations in navigation, encryption, space exploration, video game development and even in medicine. As π is fundamental to spherical geometry, it is at the heart of positioning systems in GPS navigations. It also contributes significantly to cybersecurity. As it is an irrational number it is an excellent foundation for generating randomness required in encryption and securing communications. In the medical field, it helps to calculate blood flow rates and pressure differentials. In diagnostic tools such as CT scans and MRI, pi is an important component in mathematical algorithms and signal processing techniques.

This elegant, never-ending number demonstrates how mathematics transforms into practical applications that shape our world. The possibilities of what it can do are infinite as the number itself. It has become a symbol of beauty and complexity in mathematics. “It matters little who first arrives at an idea, rather what is significant is how far that idea can go.” said Sophie Germain.

Mathematics fans are intrigued by this irrational number and attempt to calculate it as far as they can. In March 2022, Emma Haruka Iwao of Japan calculated it to 100 trillion decimal places in Google Cloud. It had taken 157 days. The Guinness World Record for reciting the number from memory is held by Rajveer Meena of India for 70000 decimal places over 10 hours.

Happy Pi Day!

The author is a senior examiner of the International Baccalaureate in the UK and an educational consultant at the Overseas School of Colombo.

by R N A de Silva

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Sheer rise of Realpolitik making the world see the brink

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A combined US-Israel attack on Iran.(BBC)

The recent humanly costly torpedoing of an Iranian naval vessel in Sri Lanka’s Exclusive Economic Zone by a US submarine has raised a number of issues of great importance to international political discourse and law that call for elucidation. It is best that enlightened commentary is brought to bear in such discussions because at present misleading and uninformed speculation on questions arising from the incident are being aired by particularly jingoistic politicians of Sri Lanka’s South which could prove deleterious.

As matters stand, there seems to be no credible evidence that the Indian state was aware of the impending torpedoing of the Iranian vessel but these acerbic-tongued politicians of Sri Lanka’s South would have the local public believe that the tragedy was triggered with India’s connivance. Likewise, India is accused of ‘embroiling’ Sri Lanka in the incident on account of seemingly having prior knowledge of it and not warning Sri Lanka about the impending disaster.

It is plain that a process is once again afoot to raise anti-India hysteria in Sri Lanka. An obligation is cast on the Sri Lankan government to ensure that incendiary speculation of the above kind is defeated and India-Sri Lanka relations are prevented from being in any way harmed. Proactive measures are needed by the Sri Lankan government and well meaning quarters to ensure that public discourse in such matters have a factual and rational basis. ‘Knowledge gaps’ could prove hazardous.

Meanwhile, there could be no doubt that Sri Lanka’s sovereignty was violated by the US because the sinking of the Iranian vessel took place in Sri Lanka’s Exclusive Economic Zone. While there is no international decrying of the incident, and this is to be regretted, Sri Lanka’s helplessness and small player status would enable the US to ‘get away with it’.

Could anything be done by the international community to hold the US to account over the act of lawlessness in question? None is the answer at present. This is because in the current ‘Global Disorder’ major powers could commit the gravest international irregularities with impunity. As the threadbare cliché declares, ‘Might is Right’….. or so it seems.

Unfortunately, the UN could only merely verbally denounce any violations of International Law by the world’s foremost powers. It cannot use countervailing force against violators of the law, for example, on account of the divided nature of the UN Security Council, whose permanent members have shown incapability of seeing eye-to-eye on grave matters relating to International Law and order over the decades.

The foregoing considerations could force the conclusion on uncritical sections that Political Realism or Realpolitik has won out in the end. A basic premise of the school of thought known as Political Realism is that power or force wielded by states and international actors determine the shape, direction and substance of international relations. This school stands in marked contrast to political idealists who essentially proclaim that moral norms and values determine the nature of local and international politics.

While, British political scientist Thomas Hobbes, for instance, was a proponent of Political Realism, political idealism has its roots in the teachings of Socrates, Plato and latterly Friedrich Hegel of Germany, to name just few such notables.

On the face of it, therefore, there is no getting way from the conclusion that coercive force is the deciding factor in international politics. If this were not so, US President Donald Trump in collaboration with Israeli Rightist Premier Benjamin Natanyahu could not have wielded the ‘big stick’, so to speak, on Iran, killed its Supreme Head of State, terrorized the Iranian public and gone ‘scot-free’. That is, currently, the US’ impunity seems to be limitless.

Moreover, the evidence is that the Western bloc is reuniting in the face of Iran’s threats to stymie the flow of oil from West Asia to the rest of the world. The recent G7 summit witnessed a coming together of the foremost powers of the global North to ensure that the West does not suffer grave negative consequences from any future blocking of western oil supplies.

Meanwhile, Israel is having a ‘free run’ of the Middle East, so to speak, picking out perceived adversarial powers, such as Lebanon, and militarily neutralizing them; once again with impunity. On the other hand, Iran has been bringing under assault, with no questions asked, Gulf states that are seen as allying with the US and Israel. West Asia is facing a compounded crisis and International Law seems to be helplessly silent.

Wittingly or unwittingly, matters at the heart of International Law and peace are being obfuscated by some pro-Trump administration commentators meanwhile. For example, retired US Navy Captain Brent Sadler has cited Article 51 of the UN Charter, which provides for the right to self or collective self-defence of UN member states in the face of armed attacks, as justifying the US sinking of the Iranian vessel (See page 2 of The Island of March 10, 2026). But the Article makes it clear that such measures could be resorted to by UN members only ‘ if an armed attack occurs’ against them and under no other circumstances. But no such thing happened in the incident in question and the US acted under a sheer threat perception.

Clearly, the US has violated the Article through its action and has once again demonstrated its tendency to arbitrarily use military might. The general drift of Sadler’s thinking is that in the face of pressing national priorities, obligations of a state under International Law could be side-stepped. This is a sure recipe for international anarchy because in such a policy environment states could pursue their national interests, irrespective of their merits, disregarding in the process their obligations towards the international community.

Moreover, Article 51 repeatedly reiterates the authority of the UN Security Council and the obligation of those states that act in self-defence to report to the Council and be guided by it. Sadler, therefore, could be said to have cited the Article very selectively, whereas, right along member states’ commitments to the UNSC are stressed.

However, it is beyond doubt that international anarchy has strengthened its grip over the world. While the US set destabilizing precedents after the crumbling of the Cold War that paved the way for the current anarchic situation, Russia further aggravated these degenerative trends through its invasion of Ukraine. Stepping back from anarchy has thus emerged as the prime challenge for the world community.

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