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PIU completes Bukit Timah drainage project to reduce risk of flooding

SINGAPORE: The expansion of Bukit Timah First Diversion Channel was completed seven years later and will better protect the flood-prone area.

The $ 300 million project is one of Singapore's most expensive and complex drainage improvement works.

The 3.2 km canal has now mitigated the flood risk on Bukit Timah Road and Dunearn Road, indicating that it can now receive 30% more rainwater than it had previously been from the national water agency PUB on Friday (September 13th).

This area includes Ngee Ann Polytechnic, World of Beauty Plaza, King Albert Park and Sime Darby Center.

Originally built in 1972, the channel directs the rain water flowing from the top of the Bukit Timah Canal to the Sungei Ulu Pandan.

However, PIU said it was frequently flooded in the surrounding areas due to rapid urbanization and the “less-sized” canal.

In November 2009, it was crushed by the equivalent of 115 Olympic water pools, which flowed into the canal after heavy rainfall. Flood waters at the knee level caused major traffic congestion and partially submerged basement car parks.

Last year, another heavy rain caused a puddle in Bukit Timah and affected the area from Blackmore Drive to Wilby Road.

Flood June 26

Screen shot of the video taken from the flood on Toh Tuck Street after the Pan Island Expressway exit on Tuesday, June 26th. (Screengrab: YouTube / Vins and Annette Singh)

READ: & # 39; Heavy rain & # 39; caused flooding in midwest west Singapore: PIU

Since the reconstruction of the canal covers two thirds of the canal, it has evacuated an area of ​​about seven hectares – the size of seven football fields.

Previously, the Bukit Timah First Diversion Channel consisted essentially of an entire 3.2km long open evacuation. According to the PIU, some of the land is already used for entertainment.

completed tunnel at the bottom of the military hill

Image of completed tunnel under Military Hill. (Photo: PUB)


Minister of Environment and Water Resources Masagos Zulkifli said that the project, which is expected to cause more extreme weather conditions in the future, is an “important and necessary investment le with a ceremony stating that the improvement works have been completed.

He emphasized a recent study by the Swiss-based research group Crowther Lab, which describes Singapore as one of the largest cities that could have a strikingly different climate by 2050.

READ: Climate research center to explore how sea level rise can affect Singapore

“You have probably already noticed some of the impacts of climate change, such as more heavy rains and prolonged droughts, Mas Masagos said.

Itibar By 2100, we can experience elevated sea levels up to 1 meter, daily average temperatures of up to 4.6 degrees Celsius, and more extreme and intense weather events that could lead to more frequent flooding, dedi he said. The upgraded diversion channel will help Singapore prepare better for this

Railway Corridor (1)

Railway corridor view after construction. (Photo: PUB)

READ: NDR 2019: Climate change is one of the biggest challenges humanity faces, and Singapore's worsening impact

The project, which was realized in three stages, started in 2012. It was originally expected to be completed in 2016, but history was withdrawn three times due to engineering difficulties and difficult ground conditions.

As sections of the canal pass through rough terrain and forested areas, more than 10,000 reinforcing rods of at least 10 meters in length were placed along a 825 m section of the canal.

aerial view of military hill tunnel

Aerial view of military hill tunnel opening. (Photo: PUB)

This helped to stabilize the slope and ensure that it did not collapse during construction works. PIU has used this “Soil Nail” method for the first time in a drainage improvement project.

“It was a complex and challenging drainage project that requires PIU engineers and contractors to overcome a few tough obstacles during the three construction phases, Ye said Yeo Keng Soon, the PIU's manager of Catchment and Waterways.

"There was also a need for intensive efforts, such as multistage traffic deviations, to minimize discomfort and disruption for drivers and the public," he said.


Other flood protection measures for the area are in the pipeline.

In October, the PIU will begin upgrading 900 meters above Bukit Timah Canal.

The section extending from the Rifle Range road to Jalan Kampong Chantek will expand by about 12 meters, with an existing width of about 10 meters. It will also deepen from 1m to 2m.

Further downstream, work will be carried out along a 300 m stretch to raise the path on both sides of the channel up to 20 cm.

The project was awarded to Chan & Chan Engineering under a $ 53.2 million contract and is expected to be completed by 2023.

garlick ave

View of Garlick Boulevard after construction. (Photo: PUB)

The PIU said this would further enhance flood protection in the region and prevent recurrence of flash floods in recent years.

The government has invested $ 1.8 billion in drainage improvement since 2011. Another 400 million dollars will be spent over the next two years.

READ: Singapore to drain $ 400 million for two years

Since 2014, PIU has completed improvement works at 254 points to increase the capacity of drainage and canals.

Expansion in 66 other locations continues.

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