A Storm Water Tunnel With Built-in Motorway

Malaysia’s capital of Kuala Lumpur is regularly subjected to flash floods after heavy rains that remain for three to six hours, flooding the city center. After a series of devastating flash floods washed the heart of Kuala Lumpur city center and accumulated losses rose to billions of ringgit, the government approved a never-before-attempted concept to tackle the crippling floods and snarling traffic jams that plaque the Southern Gateway of the city – a SMART tunnel.
SMART stands for Stormwater Management and Road Tunnel. The 13.2m diameter tunnel consists of a 9.7km storm water bypass tunnel, with a 4km dual-deck motorway within the storm water tunnel. The main purpose of SMART is 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.