Features
Long-term preventative methods can reduce earth tremors around Victoria dam
By Karu Jayasundara(JMTB)
(former Senior Geologist, Geological Survey of Sri Lanka)
Minor earth tremors near the Victoria dam were predominantly due to man-made environmental changes at the Mahaweli river, the destination of which is the Trincomalee Canyon in North East Sri Lanka, where it flows along the weak and fractured zones of complex rock terrain.
For irrigation and hydro-power generation, it was planned under the Mahaweli Project to construct reservoirs across the river in Kothmale, Polgolla, Victoria and Randenigala.
My previous article, published in The Island of 07 Jan. 2021 discussed in detail how the recent earth tremors occurred around the Victoria dam. I mentioned that the weak zones developed around Gadaladeniya, Dumbara and Theldeniya Valley (Huluganga) Arenas with the highland series rocks. Furthermore, the weak zones between Arena rocks and the Highland series rocks were playing a major role in controlling the flow of the Mahaweli river around Kandy and Victoria dam region. Geologically, these two types of rocks originated at two different times and their formations and associated minerals are not compatible to blend with each other to create one type of rock formation. Thus, the weak shear zone has developed between these two rock groups.
During the activation of the shear zone, the fault can generate heat up to 200 °C (a shallow very low-grade cataclastic metamorphic event) and this can boil water surrounding the weak zone. The recent earth tremors in the South-East of Dumbara Arena, where the area was submerged by reservoir water, boiling water bubble eruptions have been observed by some of the villagers. (Fig 2)
Following the construction of the Victoria and Polgolla dams several environmental changes have affected the region.
1)
Sediment collection on the river bed (inside Polgolla and Victoria Reservoir)
2)
Groundwater saturation in the soil and weathered rocks around the reservoir
3)
Ecological change
As a geologist, born in Napana, a beautiful village in the Dumbara valley, I believe the first two topics are critical and must be discussed in this situation.
Before the construction of the dams, the floating sand, fine particles, and soluble substances had been deposited on the riverbanks and the sea. However, the majority of the sand and fine particles are now deposited on the bed of the reservoirs.
The shear zones can become active or move due to erosion (unloading effect) or from the loading effect of accumulated sediments from the filling of water on one side of the rock formation; this is the Dumbara Arena. The fault movement generates energetic stress, which can pass to other areas of the Dumbara Arena. This can be felt and seen as cracks on the ground.
The construction of the Victoria dam was completed 35 years ago, and since then, most of the Mahaweli river sediments have been deposited at the south east nose of the Arena (South of Aluthwatte), which is a weak zone.
Fortunately, the Pollgolla reservoir can retain part of the Mahaweli river’s sediments. However, some of the sediments can be released to the Victoria reservoir from the Polgolla dam upon opening the gates during heavy rains from the upper catchments of the Mahaweli river.
Further, the sediments from the catchment region below the Polgolla dam mainly from the Dumbara valley are directly deposited near the nose of the south east (weak shear zone) Dumbara Arena. (Fig 2)
The Victoria reservoir has two depositional regions, divided by a wedge-shaped antifoam land mass, running NW-SE direction. (Fig 1)
The Mahaweli river flows through the contact weak zones between the Highland rocks and the Arena rocks, and crosses the top of the wedge-shaped antifoam land mass without following the weak zone of the Dumbara Arena, to meet the weak zone of the Teldeniya Arena. (Fig 1)
The velocity of the water flow decreases at the turning point (nose of Arena) and changes to a northerly direction due to the NW-SE wedge- shaped antifoam land mass and flows between the weak zone of two rock groups.
Also, a small river, named Ma Oya flows to the NW direction and meets at the nose of the Dumbara Arena. This helps to slow down the water flow of the Mahaweli river further.
The environment of the nose region of the Arena is the best location for sediment deposition with a sediment weight, which has accumulated for 35 years, at this location. Thus, the weak shear zone can easily activate as a fault with the help of water pressure at the nose region of the reservoir, mainly towards the Dumbara Arena. (Fig 2) This is a good situation for the Victoria reservoir, as the major sediment depositional area is away from the dam site.
Therefore, we need to stop the shear zone activation around the Victoria dam.
Unfortunately, the catchments of Victoria and Polgolla reservoirs are in highly populated regions, which is not a favourable situation for such constructions. However, with the help of the local people, sediments floating through the drainage system towards the reservoirs can be reduced by implementing long-term solutions.
The Arena regions have an ancient irrigation system for paddy cultivation (Fig 3), which is different from other parts of the island.
Regarding geomorphology, most parts of the Arena region are covered by small hills and valleys, and beneath these are shear zones. The top layer of soil is mainly reddish semi-plastic clay and below is weathered rock (called Saprolite–Kudu Gal) and fresh low grade metamorphosed rocks, containing minerals of mica, amphibolite, silica and felspar. Chemical weathering of the minerals containing magnesium has helped produce fertile soil in the Arenas.
Fortunately, the saprolite weathered rocks (Kudu gal) can retain water as an aquifer. It is a unique character of the Arena rocks, unknowingly used by farmers, as it retains underground water and reduces surface soil erosion. (Fig 3) Once the surface soil erosion stops, the sediment discharged to the drainage system will be reduced. The tree like pattern of paddy fields in the Arenas follow the underground shear vertical fracture zones.
Small rainwater tanks (called in Patha in Sinhala) were constructed by ancient farmers at the upper end of each paddy field branch. (Fig 3) Most surface water was collected by the tanks when it rained and it would then gradually seep underground, by percolating through the soil and finally to the weathered rocks beneath. The percolated underground water slowly moved to lower regions by gravity. Sometimes the water can come to the surface as small springs. This wet condition can remain below the tanks throughout the year, even during the dry season. (FIG 4)
Furthermore, I like to encourage relevant landowners to dig trenches at their properties to collect rainwater, this will also stop flash flooding and surface soil erosion.
Rejuvenating the old irrigation system is strongly encouraged for the Arena zones. This will help to resolve the following two major problems for the reservoirs.
1)
Stop the discharge of extra water during rain.
2)
Reduce the sediment accumulation in the reservoir around SW nose of Dumbara.
The Teldeniya (Huluganga) Arena (the second depositional area of Victoria reservoir) also has the same shear zone condition, and the SW nose is close to the Victoria dam. Once the sedimentary load is heavy, this area could also have minor tremors.
Further, the east bank of the reservoir should be continually checked by geo-technologists for the stability of the slope.
Sedimentation in the Polgolla and Victoria reservoirs should be controlled by implementing a system of continuous dredging.
Finally, the dredged material of sand and clay can be used in the building and clay industries, respectively.
“A man-made disaster must be solved by man.”
(This article is for the general public but can be further discussed with impartial professionals)
Features
Mannar’s silent skies: Migratory Flamingos fall victim to power lines amid Wind Farm dispute
By Ifham Nizam
A fresh wave of concern has gripped conservationists following the reported deaths of migratory flamingos within the Vankalai Sanctuary—a globally recognised bird habitat—raising urgent questions about the ecological cost of large-scale renewable energy projects in the region.
The incident comes at a time when a fundamental rights petition, challenging the proposed wind power project, linked to India’s Adani Group, remains under examination before the Supreme Court, with environmental groups warning that the very risks they highlighted are now materialising.
At least two flamingos—believed to be part of the iconic migratory flocks that travel thousands of kilometres to reach Sri Lanka—were found dead after entanglement with high-tension transmission lines running across the sanctuary. Another bird was reportedly struggling for survival.
Professor Sampath Seneviratne, a leading ornithologist, expressed deep concern over the development, noting that such incidents are not isolated but indicative of a broader and predictable threat.
“These migratory birds depend on specific flyways that have remained unchanged for centuries. When high-risk infrastructure, like poorly planned power lines, intersect these routes, collisions become inevitable,” he said. “What we are witnessing now could be just the beginning if proper mitigation measures are not urgently implemented.”
Environmentalists argue that the Mannar region—particularly the Vankalai wetland complex—is one of the most critical stopover sites in South Asia for migratory waterbirds, including flamingos, pelicans, and various species of waders. The sanctuary’s ecological value has also supported a niche with growing eco-tourism sector, drawing birdwatchers from around the world.
Executive Director of the Centre for Environmental Justice, Dilena Pathragoda, said the incident underscores the urgency of judicial intervention and stricter environmental oversight.
“This tragedy is a direct consequence of ignoring scientifically established environmental safeguards. We have already raised these concerns before court, particularly regarding the location of transmission infrastructure within sensitive bird habitats,” Pathragoda said.
“Renewable energy cannot be pursued in isolation from ecological responsibility. If due process and proper environmental impact assessments are bypassed or diluted, then such losses are inevitable.”
Conservation groups have long cautioned that the installation of wind turbines and associated grid infrastructure—especially overhead transmission lines—within or near sensitive habitats could transform these landscapes into lethal zones for avifauna.
An environmental activist involved in the ongoing legal challenge said the latest deaths validate earlier warnings.
“This is exactly what we feared. Development is necessary, but not at the cost of biodiversity. When projects of this scale proceed without adequate ecological assessments and safeguards, the consequences are irreversible,” the activist stressed.
The debate has once again brought into focus the delicate balance between renewable energy expansion and biodiversity conservation. While wind energy is widely promoted as a clean alternative to fossil fuels, experts caution that “green” does not automatically mean “harmless.”
Professor Seneviratne emphasised that solutions do exist, including rerouting transmission lines, installing bird diverters, and conducting comprehensive migratory pathway studies prior to project approval.
“Globally, there are well-established mitigation strategies. The issue here is not the absence of knowledge, but the failure to apply it effectively,” he noted.
The timing of the incident is particularly worrying. Migratory flamingos typically remain in Sri Lanka until late April or May before embarking on their return journeys. Conservationists warn that if hazards remain unaddressed, larger flocks could face similar risks in the coming weeks.
Beyond ecological implications, experts also highlight potential economic fallout. Wildlife tourism—especially birdwatching—contributes significantly to local livelihoods in Mannar.
Repeated reports of bird deaths could deter eco-conscious travellers and damage the region’s reputation as a safe haven for migratory species.
Environmentalists are now calling for immediate intervention by authorities, including a temporary halt to high-risk operations in sensitive zones, pending a thorough environmental review.
They stress that protecting animal movement corridors—whether elephant migration routes or avian flyways—is a fundamental pillar of modern conservation.
As the controversy unfolds, one question looms large: can Sri Lanka pursue sustainable energy without sacrificing the very natural heritage that defines it?
Pathragoda added that for now, the sight of fallen flamingos in Mannar stands as a stark reminder that development, if not carefully planned, can carry a heavy and irreversible cost.
Features
‘Weaponizing’ religion in the pursuit of power
A picture of US President Donald Trump apparently being prayed for by supporters, appearing in sections of the international media, said it all loud and clear. That is, religion is being flagrantly leveraged or prostituted by politicians single-mindedly bent on furthering their power aspirations.
Although in the case of the US President the trend took on may be an exceptionally graphic or dramatic form, the ‘weaponizing’ of religion is nothing particularly new, nor is it confined to only religiously conservative sections of the West. For example, in South Asia it is an integral part of politics. The ‘South Asian Eight’ are notorious for it and it could be unreservedly stated that in Sri Lanka, the latter’s ethnic conflict would be more amenable to resolution if religion was not made a potent weapon by ambitious politicians of particularly the country’s South.
The more enlightened sections of Christian believers in the US may not have been able to contain their consternation at the sight of the US President apparently being ‘blessed’ by pastors claiming adherence to Christianity. Any human is entitled to be blessed but not if he is leading his country to war without exhausting all the options at his disposal to end the relevant conflict by peaceful means.
More compounded would be his problem if his directives lead to the death of civilians in the hundreds. In the latter case he is stringently accountable for the spilling of civilian blood, that is, the committing of war crimes.
However, the US along with Israel did just that in the recent bombings of Iran, for instance. The majority of the lives lost were those of civilians. If the US President is endowed with a Christian conscience he would have paused to consider that he is guilty of ordering the taking of the life of another human which is forbidden in the teachings of Jesus Christ.
Moreover, the ‘pastors’ praying over the US President should have thought on the above lines as well. May be they were in an effort to curry the President’s favour which is as blame-worthy as legitimizing in some form the taking of civilian lives. Apparently, the realisation is not dawning on all Christian conservatives of the US that some of these ‘pastors’ could very well be the proverbial false prophets and the latter are almost everywhere, even in far distant Sri Lanka.
However, the political reality ‘on the ground’ is that the Christian Right is a stable support base of the Republican Right in the US. Considering this it should not come as a surprise to the seasoned political watcher if the Christian Right, read Christian fundamentalists, are hand-in-glove, so to speak, with President Trump. But it is a scathing indictment on these rightist sections that they are all for perpetrating war and destruction and not for the fostering of peace and reconciliation. Ideally, they should have impressed on their President the dire need to make peace.
That said, political commentators should consider it incumbent on themselves to point out that religion is being ‘weaponized’ in Iran as well. Theocratic rule in Iran has been essentially all about perpetuating the power of the clerical class. The reasons that led to the Islamic Revolution in Iran are complex and the indiscreet Westernization of Iran under the Shah dynasty is one of these but one would have expected Iran to develop from then on into a multi-party, pluralistic democratic state where people would be enjoying their fundamental rights, as enshrined in the Universal Declaration of Human Rights, for example.
Moreover, Iran should have taken it upon itself to be a champion of world peace, in keeping with its Islamic credentials. But some past regimes in Iran had vowed to virtually bomb Israel out of existence and such regional policy trajectories could only bring perpetual conflict and war. Considering the current state of the Middle East it could be said that the unfettered playing out of these animosities is leading the region and the world to ‘reap the whirlwind’, having recklessly ‘sowed the wind’.
However, religious fundamentalism-inspired conflict and war has spread well beyond the Middle East into almost every region since 1979, the year of the Islamic Revolution in Iran. So much so, knowledgeable opinion now points out that religious identity has come to replace nationalism as a principal shaper of international politics or “geopolitics”, as quite a few sections misleadingly and incorrectly term it.
Elaborating on the decisive influence of religious identity, the well known and far traveled Western journalist Patrick Cockburn says in his authoritative and comprehensive book titled, ‘The Age of Jihad – Islamic State and the Great War for the Middle East’ at page 428 in connection with the war in Chechnya ; ‘If nationalism was not entirely dead, it no longer provided the ideological glue necessary to hold together and motivate people who were fighting a war. Unlike the Islamic faith, it was no longer a belief or a badge of identity for which people would fight very hard.’ (The book in reference was published by VERSO, London and New York).
In his wide coverage of Jihadist Wars the world over Cockburn goes on to state that today a call from a cleric could motivate his followers to lay down no less than their lives for a cause championed by the former. The 9/11 catastrophe alone should convince the observer that this is indeed true.
However, as often pointed out in this column, there is no alternative but to foster peace and reconciliation if a world free of bloodshed and strife is what is being sought. Fortunately we are not short of illustrious persons from the East and West who have shone a light on how best to get to a degree of peace. Besides Mahatma Gandhi of India, who was the subject of this column last week, we have former President of Iran Mohammad Khatami, who made a case for a ‘Dialogue of Civilizations’ rather than a ‘Clash of Civilizations’.
The time is more than ripe to take a leaf from these illustrious personalities, for, the current state of war in the Middle East has raised the possibility of a war that could transcend regional boundaries. The antagonists are obliged to exhaust all the peaceful options with the assistance of the UN system. Besides, war cannot ever have the blessings of the sane.
Features
Venerable Rahula Thera’s 35-year green mission and national Namal Uyana
It was 35 years ago, on March 28, 1991, that Venerable Rahula Thera, then a young monk, embarked on a journey to the Na forest in Ulpathagama, Palagama, in the Anuradhapura District. Today, three and a half decades later, this mission stands as living proof of the enduring bond between Buddhist philosophy and the natural world.
Marking the 35th year of this green mission, Rahula Thera’s relentless dedication has transformed the National Namal Uyana into an environmental landmark admired not only across Sri Lanka but around the globe, as well.
When studying the life of Venerable Rahula Thera, one cannot ignore the profound connection between Buddhism and the environment. Buddhism is a philosophy deeply attuned to nature. The historical use of the sacred “Na Ruka” by all four Buddhas: Mangala Buddha, Sumana Buddha, Revata Buddha, and Sobhita Buddha — for enlightenment —demonstrates that from time immemorial, Buddhism has maintained a sacred bond with the Na tree. From the birth of Siddhartha to his enlightenment, the propagation of the Dharma, and even the great Parinirvana, all of these milestones unfolded in verdant, living landscapes.
Venerable Rahula Thera did not embark on the Namal Uyana mission seeking government support or personal gain. His commitment sprang from a deep devotion to the Buddha’s teachings on grove cultivation. A grove cultivator is one who spreads compassion for nature. As the Vanaropa Sutta teaches:
Venerable Rahula Thera reclaimed Namal Uyana which was then under the control of timber smugglers and treasure hunters. The term “Wanawasi” does not merely mean living in a forest; it signifies finding rest and enlightenment through nature, free from the destructive roots of greed, sin, and delusion.
Another defining aspect of Venerable Rahula Thera’s 35-year mission is the purification of the human mind. He has consistently taught the thousands who visit Namal Uyana that a person who loves a tree will never harm another human being. As the Dhamma proclaims:
It is important to remember that Venerable Rahula Thera devoted his life, without fear, speaking the truth and taking necessary action, tirelessly advancing the national mission he began. From 1991 to the present, he has worked with every government elected by the people, maintaining impartiality and independence from political ideology. Yet, he never hesitated to raise his voice fearlessly against any individual, of any rank or party, who committed wrongdoing.
Religious and Social Mission
The National Namal Uyana is not merely a forest; it is a magnificent heritage site, dating back to ancient times. Scattered across the landscape are boundary walls, the remains of ancient monastery complexes, and stone carvings believed to date back to the reign of King Devanampiyatissa. In earlier centuries, this sacred land had served as a meditation sanctuary for hundreds of monks. The name “National Namal Uyana,” by which this ecological and archaeological treasure is known today, was introduced by Venerable Rahula Thera in 1991. The government’s later recognition of the site as the National Namal Uyana stands as a significant achievement for both religion and national heritage.
Venerable Rahula Thera is a monk who has lived a life of renunciation. A striking example of this is his decision not to assume the position of Chief Incumbent of the National Namal Uyana Viharaya, instead entrusting the temple to the Ramanna Nikaya and its trustees. In doing so, he set a precedent for the contemporary Sangha. The Thera himself stated that he was merely the trustee of Namal Uyana, not its owner.
Legacy and Continuing Inspiration
The 35th anniversary of Venerable Wanawasi Rahula Thera’s arrival at Namal Uyana is not merely the commemoration of a period of time; it is a message of nature to future generations. Through his work, the Thera revived the ancient Hela tradition of loving trees and venerating the environment as something sacred. This religious and environmental mission remains unforgettable.
The revival experienced by Namal Uyana, after the arrival of Venerable Wanawasi Rahula Thera, is beyond simple description. Some of the major accomplishments achieved under his leadership include:
* Securing and protecting the largest Rose Quartz (Rosa Thirivana) reserve in South Asia.
* Restoring the Na forest spread across hundreds of acres, providing shelter to numerous rare plants and animal species.
* Transforming the area into a living centre for environmental education, offering practical learning experiences for thousands of schoolchildren and university students.
* Drawing the attention of world leaders and international environmentalists to Sri Lanka’s unique environmental heritage.
In recognition of his immense contribution to environmental conservation, Venerable Rahula Thera was honoured with the Presidential Environment Award and the Green Award in 2004—a significant moment in his life. Yet the Thera himself has always remained devoted to the work rather than the recognition it brings, making such appreciation even more meaningful.
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