巴生河
The SMART Tunnel (Stormwater Management and Road Tunnel) functions as an innovative solution to mitigating both traffic congestion and flooding. It is a submerged tunnel which can carry both vehicular traffic as well as storm runoff on a lower level. When regular drainage infrastructure is overwhelmed, vehicles are evacuated from the tunnel and the entire tube is used as a gigantic storm drain to prevent Kuala Lumpur from flooding. It diverts water flow from the Kampung Berembang Lake, near Klang River, to Taman Desa Lake, which is near Kerayong River (one of Klang River's tributaries). Water flow can also go the opposite direction, from Kerayong River to Klang River. SMART opened in May 2007.