BRITISH CONSULTANTS are designing a special stormwater drainage and road tunnel for the Malaysian capital Kuala Lumpur.
Consultant Mott MacDonald and local engineers have developed designs for an 11.5km stormwater tunnel which incorporates a 3km road tunnel section.
This will help relieve traffic congestion from the city's southern gateway.
The $540M Stormwater Management & Road Tunnel (SMART) project will divert storm water from the confluence of two rivers, preventing it from flooding the city.
Work on one of the launch chambers for the tunnel boring machines (TBMs) is almost complete and tunnelling work is due to start in February.
The road tunnel section is a double deck structure incorporating a culvert under the lower deck. This will carry relatively low volumes of storm water.
But in a major storm, the road will be closed to allow water to be diverted into this section. This will provide 3Mm 3of capacity.
It is hoped the tunnel will help prevent a repeat of the 1971 flood that devastated the city.
It is estimated that it will be possible to reopen the road tunnel section within 48 hours of a closure.
Rapid development of the Klang Valley south east of Kuala Lumpur has increased flood risk.