As a small, low-lying city-state, Singapore remains vulnerable to the impacts of climate change. With rainfall being abundant due to its tropical climate, flash floods might sometimes occur across parts of the island, usually caused by a combination of heavy rainfall, high tides and drainage issues.
With Singapore’s air connectivity being a vital part of the national economy, Changi Airport recognises that it needs to be fully prepared for the impact of climate change, including one in 100-year flash floods, which might become increasingly prevalent.
To ensure Changi’s business continuity, besides building the airport on higher platforms above the mean sea level, the other precaution that Changi Airport Group (CAG) took was to increase the capacity of the airports’ drains, to reduce the risk of flooding during “intense rain”.
Adding to the challenge of building new infrastructure at a busy airport which operates 24-by-7 was the fact that part of the new drain cuts across the full stretch of Airport Boulevard underground. To ensure minimal impact to traffic flow along Airport Boulevard, CAG’s Engineering team came up with an innovative way to construct the drains, using the “Pull and Rail” method.