The canal connects the upstream section of Stamford Canal to the Singapore River. It will run underneath the road, from Tanglin along Grange Road, across Hoot Kiam Road, through Irwell Bank Road, River Valley Road, off Kim Seng Road, and to the River.
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Here is the press release from PUB:
PUB to carry out tunnelling works for Stamford Diversion Canal Phase 2
The national water agency will also roll out drainage improvement projects at some 17 locations in 2015.
SINGAPORE - PUB, the national water agency is starting work on the second phase of the Stamford Diversion Canal from November 2014.
The works will be carried out by Tiong Seng Contractors (Private) Limited for $107.7 million.
The new 2km-long diversion canal connects the upstream section of Stamford Canal to the Singapore River. It will run underneath the road, from Tanglin along Grange Road, across Hoot Kiam Road, through Irwell Bank Road, River Valley Road, off Kim Seng Road, and to the Singapore River.
For the second-phase work, between Grange Road and River Valley Road, the tunnelling method will be largely used to build the new diversion canal.
PUB will use tunnelling to construct underground twin tunnels, with a diameter of 4.5m each, along a 1km stretch at Grange Road bet ween Tanglin and Hoot Kiam Road.
These twin tunnels will be connected to culverts and box drains.
Depending on the contours of the land for this stretch, the twin tunnels will reach depths of up to 10m underground.
Mr Ridzuan Ismail, PUB's Director of Catchment and Waterways said, "Tunnelling for the Stamford Diversion Canal will entail complex infrastructural work, but by leveraging on technology, it is a cost-effective measure that allows us to work within a narrow corridor of space along the roads, reduce disruption to traffic and ensur e continued work access at all times."
Phase 1 of Stamford Diversion Canal (Tanglin and Kim Seng areas) was awarded in May 2014 and the physical construction work started in July.
The entire 2km Stamford Diversion Canal is expected to be ready in 2017.
New drainage projects in 2015
PUB continually upgrades Singapore's existing drains and canals or 'pathways' to enhance flood protection for Singapore. The national water agency has drainage improvement projects underway or scheduled to take place at 139 locations island-wide in 2014.
Drainage improvement projects at 58 locations have been completed since the start of the year.
In addition, PUB has scheduled new projects at some 17 locations for the coming year. Work on Siglap Canal has just begun.
The canal will be upgraded in phases, with the first phase covering the section from East Coast Parkway to the sea, where the canal will be deepened and widened by 2017.
Expansion and deepening works for the Bukit Timah First Diversion Canal from Holland Green to Clementi Road are expected to commence in the first quarter of 2015.
At the Bukit Timah Canal, works to widen and deepen the section from Rifle Range Road to Jalan Kampong Chantek will commence by third quarter of 2015.
At Sungei Pandan Kechil, work on the temporary pedestrian and vehicular bridges started in April 2014 to facilitate the canal expansion.
About 600m of the canal between the Ayer Rajah Expressway and West Coast Road will be widened and deepened while 65m of the covered drain from Blk 610 to the canal will be upgraded. These works are expected to complete by the second quarter of 2017.
Works for the 850m section between West Coast Road and the sea are expected to commence in the fourth quarter of 2015.
"Drainage improvement , or "pathway" solution, is part of our holistic "Source-Pathway-Receptor" approach to enhance our drainage system. We have works ongoing or scheduled for at 156 locations across the island to increase the capacity of the drains and canals. There will be some inconvenience as works are being carried out and we are taking all possible measures to minimise it. We also seek the community's understanding that such work is necessary to enable Singapore to cope with more intense storms, " added Mr Ridzuan.