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  • HOW SMART TUNNEL WORKS?

    Yesterday we already posted about on how to drive in a flood.We hope that the information are useful for all of you.So for today we want to share some information about the SMART tunnel that help to solve the flash flood problem in Kuala Lumpur.We hope that this information will be useful for all of you.For those who have the opportunity or already used the tunnel please share your experience with us and all other readers here by leaving some comment.

    Kuala Lumpur’s Stormwater Management and Road Tunnel (SMART) is a unique solution to the Malaysian capital’s long-term traffic and stormwater management problems and the first tunnel of its kind in the world.It is a project under the Federal Government initiated to solve the problem of flash flooding in Kuala Lumpur from the Sungai Klang and Kerayong rivers and also to reduce traffic jams during the daily rush hour.The project is implemented through a joint venture pact between MMC Corp Berhad and Gamuda Berhad with the Department of Irrigation And Drainage Malaysia and the Malaysian Highway Authority as the executing government agencies.

    The 13.2m diameter tunnel consists of a 9.7km stormwater bypass tunnel, with a 4km dual-deck motorway within the stormwater tunnel.The motorway is suitable for light vehicles only.

    SMART opened to traffic on 14 May 2007and the cost of the project was around RM 1,887m (approximately US$514m).The tunnel can handles 30,000 cars per day and has been used 44 times to divert floodwater.

    SMART TUNNEL FOUR MODE OPERATION – HOW SMART TUNNEL WORKS?



    MODE 1 :

    -When weather is fair with little or no rain falling and traffic is allowed in the tunnel.

    MODE 2 :

    -Activated when moderate rain falls and the flow rate recorded at the confluence of upper Sungai Klang/Sungai Ampang (‘L4’ flow station) is 70-150 m3/s.
    -Excess flood water will be diverted to SMART holding pond and only the lower drain of tunnel will be used to convey flood flow to the Desa attenuation pond. 50 m3/s will be discharged to City Centre.
    -Road traffic tunnel will remain opened to road users.

    MODE 3 :

    -Activated when major storm event occurs and flood model forecasts a flow rate of 150 m3/s or more at L4. Only 10 m3/s will be discharged to city centre.
    -Traffic will be evacuated from the road tunnel.
    -If heavy rain storm stops early or due to some specific circumstances, then the traffic tunnel will not be flooded.
    -Road tunnel will be re-opened to traffic within 2 to 8 hours after closure.

    MODE 4 :

    -Activated if heavy rain storm prolongs, usually will be confirmed 1-2 hour after Mode 3 is declared.
    -Road tunnel will be used for passage of flood flow after traffic evacuation completed.
    -Road tunnel will be re-opened to traffic within 4 days of closure.

    SMART TUNNEL TECHNICAL SPECIFICATIONS.

    STORMWATER TUNNEL.

    Construction cost: RM1,887 million (US$514.6 million)
    Stormwater tunnel length: 9.7 km (6.0 mi)
    Diameter: 13.2 m (43.3 ft) (outer diameter)
    Tunnelling method: Tunnel Boring Machine (TBM)
    TBM type: Slurry shield

    MOTORWAY TUNNEL.

    Motorway tunnel length: 4 km (2.5 mi)
    Structure type: Double Deck
    Ingress and egress: 1.5 km (0.93 mi) at Jalan Sultan Ismail and Jalan Imbi
    Length: 1.4 km (0.87 mi) at Jalan Tun Razak
    Links: 1.6 km (1 mi) at Kuala Lumpur-Seremban Expressway Links: City Centre near Kg.Pandan Roundabout KL-Seremban Expressway near Sungai Besi Airport

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