Operational Modes of The Smart Tunnel

MODE 1

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

MODE 2

Activated when moderate rainfalls and the flow rate recorded at the confluence of upper Sg. Klang/Sg. Ampang (L4 flow station) is 70-150 m 3 /s. Only 50 m 3 /s is allowed to flow downstream

/s. Only 50 m /s is allowed to flow downstream Excess flood water will be diverted to SMART storages and only the lower drains of tunnel will be used to convey flood flow to the Desa attenuation pond

Road tunnel will still be opened to traffic

MODE 3

Activated when major storm event occurs and flood model forecasts a flow rate of 150 m 3 /s or more at L4

/s or more at L4 Traffice will be evacuated from the road tunnel. This normally takes about one hour. Only 10 m 3 /s is allowed to flow downstream

/s is allowed to flow downstream 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 2-8 hours after closure

MODE 4