Rainwater drainage specialists transform rainwater management internationally

Leading rainwater specialists appointed to consult on ambitious international airport project, expected to increase footfall to Singapore’s largest airport by over 50 million passengers annually.


Siphonic drainage provides a smarter and more efficient way to manage rooftop rain. With a higher flow rate and the need for fewer and physically smaller pipes, it offers better protection from leaks and overflows while facilitating rainwater harvesting.

Drainage with environmental impact

“Not only does it look neater; it makes buildings greener,” explains Eugene Finn, Managing Director, Capcon. “Siphonic drainage supports rainwater harvesting and requires significantly fewer materials, fewer delivery loads and far less excavation. It also adds a layer of certainty to the design and installation process, as the designs are usually tailored to the project. Compared to traditional systems, we’re seeing cost savings of 25–40%, and the carbon footprint of installation is dramatically lower.”

All of our designs are drawn up in-house here in Ireland, but we partner with manufacturers across the world to deliver the installs.

The challenge of modern-day designs

According to Finn, many modern buildings are being constructed in environments where traditional pipework is neither practical nor aesthetically pleasing, meaning designs are becoming increasingly complex and sophisticated. 

“Siphonic drainage by design is far more bespoke. We can discreetly channel water into concealed collection tanks outside of public view, where it can be stored and reused for sustainable applications,” he explains.

Changi Airport Terminal 5 project

terminal 5 aerial 7by5

Capcon has been appointed as an independent consultant to advise on the design, scope, routes and coordination of the rainwater drainage systems for Changi Airport Terminal 5, an ambitious project expected to accommodate over 50 million more passengers at Singapore’s largest airport.

“Designed by KPF in collaboration with Heatherwick Studio and architects61, we are working alongside delivering advanced rainwater solutions tailored to meet the terminal’s ambitious performance and environmental standards,” explains Finn.

Terminal 5 will bring together rail, bus and other point-to-point transport services to connect Singapore travelers seamlessly, with Phase 1 expected to open by the mid-2030s.

Drainage specialists with global impact

International leaders of rainwater drainage and harvesting solutions, Capcon is a niche company experiencing rapid growth, having doubled its workforce within the last year. They currently have close to 140 live projects across 14 different countries and pride themselves on their ability to work in collaboration with both local and global industry stakeholders.

“All of our designs are completed in-house here in Ireland, but we partner with manufacturers and contractors across the world to deliver the installs,” says Finn. “We offer our clients the flexibility to work with any manufacturer of their choice, ensuring the final solution aligns perfectly with their preferences, requirements and local regulations.”

How Can We Help?

Meet Eugene Finn

Talk to our managing director Eugene and find out how we can tailor a solution to refurbish or upgrade your rainwater drainage system. 

eugene finn