Drainage canal in flood-prone Bukit Timah fully upgraded

The rainfall catchment area it supports includes homes, as well as other malls and public facilities like Beauty World Plaza, Bukit Timah Shopping Centre and Dunearn Village, as well as Beauty World and King Albert Park MRT stations.

On Oct 23, PUB announced that the final 900m stretch of the canal running from Rifle Range Road to Jalan Kampong Chantek has been widened and deepened.

Works on the final stretch, which cost about $60 million, began in October 2019. Once angular in shape, the canal has been converted into a U-shaped drain and box culvert, allowing it to convey 30% more storm water, said PUB.

The Bukit Timah area has historically been prone to flooding because its valley-like terrain forms a basin that channels storm water quickly into the low-lying canal. Urban development over the decades has also contributed to an increase in run-off.

The last major flooding event in the Upper Bukit Timah area was on April 20, 2025, when downpours led to flash floods in four areas, including a stretch between Clementi Road and Blackmore Drive.

The flash floods subsided after about an hour, and the amount of rainfall over Singapore that evening amounted to nearly half of Singapore’s average monthly rainfall in April.

Dunearn Road near Sime Darby Centre experienced flash floods a couple of times in 2021. In August that year, a flood between Sime Darby Centre and Binjai Park affected bus operations along Dunearn Road for about an hour.

However, the seven–year upgrading period for the 900m stretch of the canal had also resulted in traffic congestion for commuters and residents in the area.

With several schools located in the area, traffic was also an issue for students and parents during drop-off and school dismissal times.

In 2023, Holland-Bukit Timah GRC MP Christopher de Souza asked Parliament if the works along the 900m stretch could be expedited.

Minister for Sustainability and the Environment Grace Fu then said the works will be delayed from 2024 to 2026 to align with the development of a green corridor in the same area.

This is because the future Bukit Timah-Rochor Green Corridor will have an elevated sky park for pedestrians over the Upper Bukit Timah Canal, and PUB helped build the foundations for the sky park on top of the canal.

This elevated connection from the Rail Corridor to Jalan Kampong Chantek is estimated to be completed by 2027.

The Covid-19 pandemic had also pushed back the canal’s completion, said Maurice Neo, director of PUB’s catchment and waterways department.

There were also construction challenges due to limited working space and the canal’s proximity to underground MRT lines.

The working hours were also shortened to between 9.30am and 4.30pm to minimise traffic disruptions during peak hours, he added.

“To carry out the works safely while minimising disruption along Bukit Timah Road and Dunearn Road, traffic was progressively diverted, and replacement lanes were provided to create the temporary workspace required for construction,” added the agency.

The Upper Bukit Timah Canal is one of three drainage systems which serve the entire Bukit Timah area from Beauty World MRT station to Serangoon Road.