Features
Remedy worse than disease: Nilwala Ganga floods
by G. T. Dharmasena
Former Director General of Irrigation and currently the Consultant to the Metallurgical Corporation of China
The Nilwala Ganga has a drainage area of 1043.0 sq.km and its annual average run off to sea is estimated as 1167.0 Million Cubic Meters (mcm). The only major infrastructure facility available in the basin for flood protection is the project implemented during 1982-1988 with financial assistance from the Government of France. This scheme provided a series of dykes with pump houses to protect the lower reaches of the Nilwala Ganga.
In this scheme the unprotected area between the dykes and the river banks is considerably large and about 2,800 ha of developed land area was declared as unprotected. However, the relocation of the people who lived in this area had not taken place. Therefore, flooding of Nilwala Ganga is still a major issue in the basin due to this inherent relocation deficiency during the project implementation. The scheme provided the protection for 4,800 ha of lands for a flood of 10-year return period. See Fig.1.
2.0 Salinity barriers
The concept of salinity barriers in Sri Lanka was first discussed for the Kelani Ganga due to intrusion of saline water to Ambatale water intake during drought periods, when the flow in the river is very low. This discussion was as far back as 1998. My association with this first conceptual design was on the request made by French Consultant, GERSAR, appointed by the National Water Supply and Drainage Board (NWSDB). Our main concern was the impact of upstream inundation due to the proposed barrier. We found that rubber dam technology had been introduced by the Japanese under these circumstances and this technology was implemented in countries like Japan, Bangladesh and Thailand etc. at that time.
When I visited Japan for some other purpose, I was particularly interested in visiting a rubber dam. See Fig.2.
With the help of that experience, the Kelani Ganga salinity barrier was designed by keeping a firm concrete base one meter below the sea level for the foundation and the rubber dam on the concrete base. The crest level of the rubber dam was kept at + 1.0 m above the sea level, when the rubber dam was inflated during low flows. The arrangement is for the rubber dam to deflate before the arrival of floods during monsoons. During wet seasons, the rubber dam is not visible and it is below sea level. There are no gates or piers in this structure and therefore there is no significant impact upstream during floods. A numerical model study was undertaken to verify the above parameters to understand any significant upstream flooding up to Hanwella.
However, during the construction of the Kelani Ganga barrier the concrete base was completed to the design level of -1.0 m MSL, but a rubber dam was found expensive for the NWSDB. Therefore, currently sand bags are placed during low flow conditions of the river on the concrete structure as a temporary measure. The Irrigation Department and the NWSDB are currently studying a permanent solution with Lanka Hydraulic Institute (LHI) consultants.
3.0 Major issues at Nilwala Ganga before the current debacle
The following are the major issues highlighted by the stakeholders during a consultation process organized by the Irrigation Department in 2010 prior to the current problem.
· The present flood protection level provided by the current flood protection scheme proved to be insufficient due to enhanced rainfall intensities now prevailing in the area due to environmental changes.
· During the implementation of the current flood protection scheme, 2,800 ha were declared as unprotected. This area consists of developed lands and the people who occupied these lands continue to remain in the unprotected area and become victims of floods.
· The flood protection scheme provides 10-year safety for 4,800 ha of lands, while the flood levels in the unprotected area have risen by 2.0 m, and the water level in the Matara town area has risen by 0.63 m after the provision of dykes.
· The large operational cost for water pumps has an impact on the O&M budget of the Irrigation Department. There are 24 heavy duty pumps at three pump houses to drain flood water from river tributaries.
· The Nilwala Ganga is the main source of water for domestic use. Due to salinity intrusion during the dry season, all three major water intakes maintained by the NWSDB are affected and therefore NWSDB finds it difficult to supply safe drinking water during the low flow periods in the river
While the above issues remained unaddressed, an attempt was made by the NWSDB to address the last issue. In 2022, a salinity barrier was constructed by the NWSDB, but unfortunately this remedy has now created one of the most critical new issues.
4.0 The salinity barrier at Nilwala Ganga- Current situation
The salinity barrier for Nilwala Ganga was proposed in 2003. Its construction commenced in 2012 and was completed in 2022 by a Korean contractor. See Fig.3. Due to prevailing rains since September, the low-lying areas of the Nilwala Ganga valley in the Matara, Malimbada, Kamburupitiya, Thihagoda, Athuraliya and Akuressa Divisional Secretariats go under water during major floods. According to media reports, at present, 28,000 people belonging to 8,000 families have been affected by the flood in the Matara District.
Major floods occurred in 1969, 2003 and 2017 during the recent past and the water levels receded gradually after seven to 10 days. However, the current flood water is almost stagnant and the affected area is being under water for more than three to four weeks preventing rapid drawdown of flood levels. Residents of the area alleged that the salinity barrier has not been constructed properly and that is the reason for flooding. The public also blames the Irrigation Department is the authority that approves such construction. The Department is reported to have undertaken a study.
5.0 Options for flood protection:
By considering the issues surfaced prior to 2010 along with the current issue, the following two flood protection options were suggested by engineers of the Irrigation Department and consultants of bygone days.
Option I- Construction of upstream reservoirs to detain rain water during floods.
Option II- Heightening of existing flood bunds to withstand for a higher flood without upstream Reservoirs.
5.1 Option I:
The Option I has the advantage of using the reservoirs for other purposes such as irrigation and domestic water supply in addition to the flood protection benefits. Under this Option, heightening of the dykes need not be required to pass a higher flood of design return period. However, as for this option, the people occupying the reservoir bed areas have to be relocated and it is a most complicated social and environmental issue as the areas identified for reservoir construction are highly developed.
Two major reservoir sites were identified and investigations for conceptual designs were done by the Irrigation department as far back as 1968 with foreign assistants. Fig.4 shows the location of these reservoir sites.
Additional storage:
In addition to above, the Irrigation Department has identified about eight medium size reservoir sites during previous studies. The tentative locations of these reservoirs are shown in Fig.5.
5.2 Option II:
While option I is the best engineering solution due to social and environmental issues related to relocation of people in developed lands, option II appears to be more sensible and cost effective. Heightening of the flood bunds with introduction of nonstructural measures such as flood proofing for the unprotected area is more favourable than the reservoir construction.
The safety level of the current flood bunds is for a 10-year flood and in 2010 heightening of existing flood bunds to withstand a 50-year flood was estimated as Rs. 3,700 mn including the relocation of families from the unprotected areas.
In order to reduce the flood lift near the Matara town as a result of dyke construction, a diversion canal and a tunnel were proposed under stage III of Nilwala Ganga flood protection scheme implemented by the French consultants. However, this stage III was abandoned at that time due to unrest in the country during 1989. See Fig.6.
6.0 Remedial measures for current issues:
It appears that the LHI had carried out a hydraulic model study for the NWSDB before awarding the construction to a Korean firm. The Irrigation Department is the approving agency responsible for this type of major structures across rivers. Therefore, it has the responsibility to verify the validity of model studies undertaken by any consultants before giving the approval for construction. Some argue that earlier arrangement was for a provision of collapsible gates and later it was modified to vertical lifting gates. I believe that even with collapsible gates it might not work and the real problem I see is the presence of piers. Videos taken near the salinity barrier during the recent flood clearly show contraction of streamlines around the piers restricting the smooth flow of water.
At present both LHI and the Irrigation Department are expected to review the model studies already undertaken by LHI prior to the construction of salinity barrier to find a solution to rectify this issue by way of modifications to the structure. In my opinion, it will not be so easy unless we consider some alternative structural solutions proposed under option II as indicated in section 5.2, if authorities want to keep the present salinity barrier intact.
Features
‘The devil is in the details’ in West Asian peace
It is obviously too early for an outpouring of joy over the seeming cessation of hostilities between the main antagonists in West Asia. While the prospect of there being a measure of calm in the region is being welcomed by considerable sections of the international community, what is ‘on the table’ currently is only a Memorandum of Understanding between the US and Iran to give peace a chance. The hard part in the peace effort remains to be achieved.
In the Middle East of today we have one of the most complex conflicts to break out in modern international politics and the observer would be naive in the extreme to expect a facile and early closure to the tangle. Yet, for the sake of the world’s publics who have been hurting badly in the prolonged hostilities one could only hope that the US-Iran MoU that is expected to be signed by the sides on Friday would lead eventually to a substantive peace. The world’s thanks are due to Pakistan in this connection for its sustained support in the peace drive.
While the sides have agreed to a ceasing of hostilities in the most general terms and have reached accord on the facilitation of uninterrupted oil and gas supplies to the rest of the world, for instance, the ‘devil will prove to be in the details’ in an envisaged comprehensive peace settlement. It is these details that would make or break peace if the negotiations go on in earnest.
Nevertheless, the details would need to be worked out consensually in a spirit of compromise with an eye to the greater good of the world community. Realpolitik or a narrow focus on solely the national interest among the protagonists, for example, would need to give way to a measure of humanity that would encompass within it a consideration of the overall well being of the world. In other words, it is statesmanship that would crucially matter.
The next few weeks would establish whether humanists are ‘asking for far too much’ when they broach the questions at issue in these terms. Yet it is essentially self interest and national security considerations of the first importance that drove the conflict from even prior to February this year and these questions would need to be taken up and resolved to the satisfaction of the US and Iran in the main if some headway is to be made towards a durable settlement.
The nuclear issue would prove to be the proverbial Gordian Knot. From a realistic viewpoint, Iran could not be expected to be without a potential nuclear deterrent in the face of perceived nuclear threats emanating for it from the West and Israel. In the short term, Iran would need to possess this deterrent to a measure, within a mutually agreed international legal framework maybe, until wide agreement is reached on the nuclear tangle. Specifically, Iran’s immediate threat perceptions with regard to her nuclear-powered rivals would need to be defused during initial negotiations.
Ideally it is a world free of nuclear weapons that must be aimed at but since this goal cannot be achieved in the near or medium terms, unfolding negotiations would need to ensure Iran’s absolute security in a world of powers that continue to swear by the nuclear deterrent, if it is to give up the suspected latter capability.
However, it is to the degree to which the present nuclear powers divest themselves of this capability that Iran could be put at ease on this score. Accordingly, it is nothing short of a complete elimination of nuclear weapons from the world that could dissuade keenly security conscious states from developing nuclear weapons of their own with a mass destruction capability.
This is the number one dilemma the international community needs to grapple with going forward and it is to the extent to which it resolves it that a nuclear weapons free world could be envisaged. No doubt, an uphill challenge.
Compelling Israel to support the present negotiatory process constitutes another grueling challenge for the US. Currently the Iranian position essentially is that a Middle East peace is inseparable from a normalization of the security situation in Lebanon. That is, the present Israeli attacks on the Hezbollah presence in Lebanon must cease if a comprehensive peace is to be realized in West Asia.
However, Israel is showing no signs of drawing back from its attacks on Hezbollah strongholds in Lebanon since the security of the Israeli state is being seen as threatened by the militant group. Co-opting Israel into the negotiatory effort therefore would turn out to be a matter of paramount concern for the US.
Moreover, elements in the rightist administration in Israel are seeing the current peace efforts as a ‘sell out’ to the enemies of Israel. They would have none of it. It is left to be seen how the US would be managing these virtual storm centres in the diplomatic process that could very well bring down the overall purported peace drive.
A recent pronouncement by US Vice President J.D. Vance points to yet another problem area in the US’ current peace overtures. He said that, ‘Regional peace and stability includes stopping the funding of terrorist organizations.’ He was obviously referring to the support extended by Iran to Hezbollah when he mentioned ‘terrorist organizations’ but he has given fresh life to the age-old conundrum of ‘Who is a terrorist?’ by these words.
To the Netanyahu government the Hezbollah and other militant organizations fighting Israel are ‘terrorists’ but from the viewpoint of the Iranian regime they are ‘freedom fighters’. This seemingly insurmountable definitional issue would not only stubbornly bedevil the peace effort but could even figure in bringing about its collapse, unless judiciously handled.
Thus, it’s the thorny details that need to be watched to keep the West Asian peace process afloat, once it gets going in earnest. There is no doubt that US President Trump would be receiving a considerable amount of support from the G7 in this historic peace undertaking and his personal appeals to the grouping currently meeting in France for continuous support are likely to elicit a positive response from it.
Likewise, Trump would need to appeal to also the BRICS countries if almost total global support is to be garnered for the peace drive in West Asia. BRICS’ solidarity with the US and the West is likely to carry considerable weight with Iran and other Eastern actors who are key to a sustained peace drive in the Middle East.
Features
Sri Lanka’s elephant paradox: Govt. counts tourism dollars while playing a dangerous numbers game: Expert
At a time when Sri Lanka is enjoying a resurgence in wildlife tourism, with elephants remaining the undisputed stars of the country’s national parks and one of its most marketable natural assets, elephant conservationist Supun Lahiru Prakash has sounded a stark warning: the nation is in danger of losing the very species that helps attract millions of tourism dollars while sustaining some of the island’s most important ecosystems.
Supun says repeated claims by authorities that Sri Lanka’s elephant population is increasing, despite the absence of a final survey report and amid continuing elephant deaths, risk creating a misleading narrative that could undermine conservation efforts and encourage retaliation against elephants.
According to Supun, the issue is not merely about numbers. It is about political priorities, scientific credibility and the future of one of Sri Lanka’s most iconic species.
“Repeatedly claiming that the elephant population is increasing appears to be an attempt to hide the Government’s inability to manage the rising annual elephant death rate and the complications of human-elephant conflict,” Supun said.
For decades, the Sri Lankan elephant has been a symbol of the country’s rich natural heritage. It is the centrepiece of wildlife tourism, drawing visitors from across the globe to national parks such as Yala, Udawalawe, Minneriya, Kaudulla and Wilpattu. International wildlife documentaries, tourism campaigns and social media promotions frequently place elephants at the heart of Sri Lanka’s nature tourism brand.
Yet, according to Supun, the country’s conservation policies do not reflect the value of the species.
“On one hand, the Government is enjoying increasing tourism revenue, and elephants remain one of Sri Lanka’s most important wildlife attractions. On the other hand, narratives are being promoted that could encourage retaliation against the very species that contributes significantly to the country’s tourism industry,” Supun said.
According to the First Countrywide National Survey of Elephants conducted in 2011, Sri Lanka had 5,879 elephants. However, official statistics show that 4,167 elephants died between 2012 and 2024.
Supun stressed that these figures represent only the deaths officially recorded by the Department of Wildlife Conservation.
“In a context where more than 70 percent of the country’s elephant population reported in 2011 has died within 13 years, it is difficult to accept claims that the population has increased,” Supun said.
The conservationist pointed out that elephants have the longest gestation period among land mammals and that scientific studies have reported increasing interbirth intervals among female elephants together with high calf mortality.
“When such biological realities are taken into consideration, claims of a dramatic increase in elephant numbers become difficult to understand,” Supun said.
Supun believes that repeated references to increasing elephant populations risk fuelling public hostility towards elephants, particularly among farming communities already affected by crop raids and property damage.
“Such claims can create the impression that elephant populations are exploding and thereby promote retaliation against elephants as well,” Supun said.
According to Supun, Sri Lanka’s elephant crisis cannot be understood solely through population estimates. The real issue lies in the country’s failure to address human-elephant conflict through long-term, science-based solutions.
Sri Lanka continues to record among the highest levels of human-elephant conflict in the world. Every year, hundreds of elephants and dozens of people lose their lives as competition for land and resources intensifies.
Despite the scale of the crisis, Supun says authorities continue to rely on strategies that have repeatedly failed.

Lahiru Prakash
These include driving elephants into protected areas, strengthening electric fences to confine them there and allocating additional manpower to maintain fencing systems.
Supun was also critical of several proposals that emerged from district-level discussions on conflict mitigation, including the sowing of paddy and corn using Air Force drones and the planting of fruit orchards within protected areas.
“Such proposals fail to address the real ecological and social dimensions of the conflict,” Supun said.
While welcoming reports that the Government intends appointing a national-level mechanism to tackle human-elephant conflict, Supun said the challenge required intervention at the highest level of government.
“Given the gravity, complexity and geographical spread of human-elephant conflict, appointing any committee other than a Presidential Task Force is not useful,” Supun said.
He argued that a Presidential Task Force chaired by either the President or the Secretary to the President would be better positioned to overcome the bureaucratic delays and institutional fragmentation that have hindered previous efforts.
Supun also stressed the urgent need to restore and protect elephant corridors and home ranges that allow elephants to move safely across landscapes.
He cited the Koholankala elephant corridor in Hambantota as one example where removing obstacles could help reduce conflict while improving habitat connectivity.
At the same time, Supun questioned policies that permit the allocation of forest lands in areas identified by environmental assessments as crucial elephant ranges and movement corridors.
“The opening of elephant corridors and the protection of elephant home ranges must be carried out scientifically and consistently if they are to succeed,” Supun said.
Beyond tourism, Supun emphasised the ecological importance of elephants.
“Elephants are ecosystem engineers. Through their feeding habits and movements, they help maintain habitats that support numerous other species. In many ways, they create safer and healthier environments for wildlife,” Supun said.
According to Supun, protecting elephants means protecting entire ecosystems and the biodiversity upon which Sri Lanka’s wildlife tourism industry depends.
“By protecting elephants, we are also protecting the biodiversity that makes Sri Lanka one of the world’s premier wildlife tourism destinations,” Supun said.
As Sri Lanka seeks to expand tourism earnings and strengthen its reputation as a wildlife destination, Supun believes the country faces a defining choice: continue with policies that have failed to stem elephant deaths and human-elephant conflict, or embrace a science-based conservation strategy that safeguards both people and wildlife.
Without a fundamental shift in policy and political will, Supun warned, Sri Lanka risks losing not only one of its most iconic species but also the ecological and economic benefits that elephants continue to provide.
“The suffering of both farmers and elephants will only intensify unless meaningful action replaces rhetoric,” Supun said.
By Ifham Nizam
Features
Top Model of the World 2026
Back-to-back victory for Colombia
Katherine Castaño of Colombia claimed the Top Model of the World 2026 crown, securing a historic back-to-back victory for her country. Angelica Sanchez of Puerto Rico was named first runner-up, and Eunice Deza of the Philippines finished as second runner-up.
Katherine was crowned by outgoing titleholder Natalia Garizabal Vera of Colombia.
Several special category awards, and subsidiary titles, were also presented during the Top Model of the World 2026 pageant.
These awards recognised excellence in modelling, peer support, and regional representation.
Primary Subsidiary Titles

Sri Lanka’s Netalie Withanage: Top 16 at
the grand finale
Miss Globe 2026: Valentina Tabares (Ecuador) — Awarded to the contestant who perfectly balances fashion modelling with traditional beauty queen qualities.
Queen of Europe 2026: Mia Danielle Williams (United Kingdom) — Given to the highest-ranking candidate from a European nation.
Special Awards Recognition
Audience Iconic Award: Charly (Dominican Republic) — Won via the official public online vote, granting her a fast-track direct entry into the Top 6.
Exotic Model of the World: Angel Emeka (Nigeria) — Awarded for exceptional editorial presence and strong runway performance.
Best Body Award: Thailand — Voted directly by fellow contestants at the Flow Spectrum Hotel. The highest-ranking runners-up for this category included Zambia, South Africa, Colombia, and Ghana.

Angelica Sanchez (Puerto Rico): 1st Runner-up
Final Placement
Winner: Katherine Castaño (Colombia)
1st Runner-Up: Angelica Sanchez (Puerto Rico)
2nd Runner-Up: Eunice Deza (Philippines)
Top 6 Finalists: Included contestants from the Dominican Republic, Romania, and Germany.
The pageant, known for focusing on professional modelling careers over just beauty, brought together 36 models from around the globe for two weeks of runway, photoshoots, and cultural events.
Sri Lanka’s Netalie Withanage walked among 36 of the world’s best and powered her way into the Top 16 at the grand finale.
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