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SMART Tunnel Project

Our Role

SMEC’s scope of work included:

  • Design review of tunnel lining and cut and cover tunnels
  • Review of construction impacts associated with tunnelling
  • Review of available geotechnical information and instrumentation
  • Monitoring of tunnelling-induced impacts on the surrounding environment.

The project mitigated flooding problems in Kuala Lumpur’s city centre and helped ease traffic congestion in southern Kuala Lumpur, near the Sungai Besi Airfield.

Project Overview

The Stormwater Management and Road Tunnel (SMART) is a storm drainage and road structure located in Kuala Lumpur, Malaysia.

The 11 km long 13 m diameter tunnel diverts flood waters away from central Kuala Lumpur and the middle 3 km section is a double deck motorway.

The tunnel has three modes of operation:

  • Mode 1 - no storm: the road section operates normally and no water needs to be diverted into the tunnel
  • Mode 2 - mild storm: the tunnel is activated to “semi-open” status by allowing diversion of water flow through the lowest channel of the road tunnel section. The motorway remains open to traffic
  • Mode 3 - major storm: the tunnel is activated to “fully open” status. Automated water tight gates are opened to allow flood water to pass through and the motorway is closed to traffic

The major components of the SMART Project comprise:

  • A stormwater bypass tunnel with a capacity of one million cubic metres
  • A 600,000 m3 holding basin and diversion structures
  • A storage reservoir
  • Gated in-take and outfall structures
  • An operation control centre complete with administrative, stormwater management and traffic management facilities
  • A 3 km long double deck motorway within the by-pass tunnel equipped with a ventilation system and emergency escape provisions.

Technical Area:
Malaysian Department of Irrigation and Drainage / Malaysian Highway Authority

Learn More

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