The "Stormwater Management and Road Tunnel" or "SMART Tunnel", is a storm drainage and road structure in Kuala Lumpur, Malaysia, a major national project in the country. It is the longest stormwater tunnel in South East Asia and second longest in Asia.The main objective of this tunnel is to solve the problem of flash floods in Kuala Lumpur and also to reduce traffic jams along Jalan Sungai Besi and Lok Yew flyover at Pudu during rush hour. There are two components of this tunnel, the stormwater tunnel and motorway tunnel.
It is the longest multi-purpose tunnel in the world. It begins at Kampung Berembang lake near Klang River at Ampang and ends at Taman Desa lake near Kerayong River at Salak South. The project is led by the government, including Malaysian Highway Authority (LLM) and the Department of Irrigation and Drainage Malaysia (Jabatan Pengairan dan Saliran = JPS) and also a company joint venture pact between Gamuda Berhad and Malaysian Mining Corporation Berhad (MMC). Construction of the tunnel began in 25 November 2003. Two Herrenknecht's Tunnel Boring Machines (TBM) from Germany were used, including "Tuah" on north side and "Gemilang" on south side. On 11 December 2003, the 13.2 m diameter Mixshield TBM, Tuah, completed a 737 m section after 24 weeks of excavation. By the end of January 2004, Tuah would start a second drive covering a distance of 4.5 km to Kampung Berembang lake. A second TBM, Gemilang, has bored 350 m since getting underway in August 2004. Operated by Wayss & Freytag of Germany, this second Herrenknecht's TBM would drive 5.3 km in the south of the city to Taman Desa lake.
On 22 April 2006, the Gemilang's TBM completed digging on the south side at the Taman Desa outfall, while the Tuah's TBM completed digging in the Kampung Berembang area in 2 April 2007.The motorway sections on the SMART system was officially opened at 3:00PM, 14 May 2007, after multiple delays. Meanwhile, the stormwater sections on the SMART system began operations at the end of June 2007.
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 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