SMART Tunnel Has Prevented An Estimated RM4.94 Billion In Damage
Kuala Lumpur’s SMART Tunnel has helped avert an estimated RM4.94 billion in structural and public losses since beginning operations in May 2007.
According to Amanat Lebuhraya Rakyat Bhd, the infrastructure asset has diverted approximately 266.03 million cubic metres of floodwater across more than 685 flood-activation events.
Those figures underline a less visible role of infrastructure in Kuala Lumpur’s property market.
While new roads and rail systems usually attract attention because they improve accessibility, flood-mitigation infrastructure protects existing homes, businesses, roads and public assets from physical damage and disruption.
For central Kuala Lumpur, that protection can be just as economically important as adding new connectivity.
SMART Is Both A Motorway And Flood Tunnel
SMART stands for Stormwater Management and Road Tunnel.
The 9.7km system was designed with two functions: managing floodwater entering central Kuala Lumpur from the Klang–Ampang catchment and easing road congestion at the southern gateway into the city.
Approximately 3km of the tunnel incorporates a double-deck motorway.
Under normal conditions, motorists use the road component as part of the urban traffic network.
When rainfall intensifies, the tunnel changes operating modes according to water-flow conditions.
During the most severe events, traffic is evacuated and the motorway section itself can be used to carry floodwater.
That dual-use design remains the defining feature of SMART.
More Than 685 Flood Activations Since 2007
The latest operational figures show just how regularly the infrastructure has been called into service.
SMART has been activated for flood management more than 685 times since opening.
According to ALR, Mode 2 has been used 556 times, Mode 3 on 118 occasions and Mode 4 on 11 occasions.
Mode 2 allows excess floodwater to flow through the lower portion of the tunnel while motorists can continue using the roadway.
Mode 3 requires the road tunnel to be evacuated and closed as the system prepares for heavier diversion.
Mode 4 is reserved for prolonged major storms, when floodwater is allowed through the motorway section after all traffic has been cleared.
Why The RM4.94 Billion Figure Matters To Property
Flood damage can affect property in several ways.
The most obvious is direct physical damage to buildings, vehicles, roads and public infrastructure.
But repeated flooding can also disrupt businesses, affect accessibility, increase repair costs and reduce confidence in vulnerable locations.
For a dense city centre, those secondary effects can become substantial.
SMART’s estimated RM4.94 billion in avoided damage therefore represents more than a flood-engineering statistic.
It reflects the economic value of protecting an urban district containing offices, retail, transport infrastructure and high-value property.
Central KL Is The Main Beneficiary
The system was built primarily to reduce flooding around central Kuala Lumpur caused by the Klang River overflowing following heavy rainfall in the Klang–Ampang catchment.
Its protection area includes the vicinity of Masjid Jamek, Dataran Merdeka, Leboh Ampang and nearby central districts.
These are among Kuala Lumpur’s oldest and most intensely developed urban areas.
Flood protection here has implications for heritage buildings, commercial premises, transport routes and public spaces as well as residential property.
For older districts in particular, infrastructure resilience can become increasingly important as rainfall intensity and urban development place more pressure on drainage systems.
SMART Does Not Protect All Of Kuala Lumpur
The scale of the avoided damage figure should not create the impression that SMART eliminates flood risk across Kuala Lumpur.
The tunnel covers around 45% of Kuala Lumpur’s flood-prone areas.
Its main function relates to the Sungai Klang and Sungai Ampang catchments.
Flooding caused by other rivers or by local drainage problems can fall outside the system’s coverage.
Areas affected by Sungai Gombak, Sungai Bonus or clogged local drainage, for example, may require separate mitigation measures.
For property buyers, this distinction matters.
Being located in Kuala Lumpur does not mean a property benefits equally from SMART.
Flood Risk Is Increasingly A Property Due-Diligence Issue
Flood exposure is becoming a more important consideration when assessing property.
Buyers often focus on tenure, accessibility, schools, rental demand and nearby developments.
But drainage, elevation and historical flood exposure can be equally relevant to long-term ownership.
For commercial buildings, flood disruption can affect business continuity.
For residential owners, it can mean damage to basements, car parks, electrical systems and vehicles.
A major public flood-mitigation system reduces part of that risk, but individual building design and local drainage still matter.
Infrastructure Resilience Supports Existing Property Value
Property discussions often focus on infrastructure that creates new value.
An MRT station may improve accessibility.
A new highway may shorten travel time.
A shopping centre may add amenities.
Flood mitigation works differently.
Its economic function is often defensive: preserving the usability and value of assets that already exist.
That can make the benefit less visible during normal weather.
But during a major storm, the difference between a protected and flooded district can be enormous.
SMART Also Cuts Travel Time
Flood management is only one half of the project.
The road tunnel also serves as an important bypass between southern Kuala Lumpur and the city centre.
Engineering references indicate that travel between the Jalan Istana interchange and Kampung Pandan can be reduced from around 10–15 minutes to approximately four minutes under normal conditions.
This creates a second property-related benefit.
The same infrastructure that protects central KL from flooding also improves road connectivity during ordinary periods.
That combination makes SMART unusual among urban infrastructure assets.
Maintaining The Tunnel Requires Significant Resources
ALR said maintaining critical infrastructure such as SMART requires substantial operating expenditure.
That is unsurprising given the complexity of the system.
It must operate safely as a road tunnel on normal days, monitor rainfall and river conditions continuously, evacuate vehicles when necessary and then switch into flood-diversion mode.
After major flood use, the tunnel must also be cleaned and inspected before reopening to traffic.
This highlights a broader point about urban infrastructure.
Building major infrastructure is only the first step.
Long-term maintenance determines whether it continues providing the intended protection decades later.
Nearly Two Decades Of Operation Provide A Real Performance Record
SMART opened in May 2007.
By 2026, it therefore has almost two decades of real-world operating history.
That distinguishes it from proposed infrastructure projects where economic or property benefits remain theoretical.
The more than 685 flood activations and 266 million cubic metres of diverted water provide measurable evidence of how frequently the system has been used.
The estimated RM4.94 billion in avoided losses should still be understood as an estimate rather than a direct cash saving recorded transaction by transaction.
But the operational data confirms that the infrastructure has played a substantial flood-management role.
Climate Resilience Will Matter More To Kuala Lumpur
The wider lesson for Kuala Lumpur is that urban property growth needs to be matched by resilient infrastructure.
Higher development density means more buildings, people, vehicles and economic activity are concentrated within the same catchment.
When severe flooding occurs, the value exposed to damage also rises.
Drainage systems, retention ponds, river improvements and infrastructure such as SMART therefore become increasingly important to long-term urban competitiveness.
For developers and buyers, climate resilience is no longer purely an environmental consideration.
It is also a property-risk and asset-protection issue.
Conclusion: SMART Protects Value Rather Than Creating Hype
The SMART Tunnel’s latest performance figures show the economic importance of infrastructure that rarely attracts attention when it is working properly.
Since 2007, it has diverted about 266.03 million cubic metres of floodwater through more than 685 activations and helped avoid an estimated RM4.94 billion in damage.
Its property relevance is straightforward.
SMART helps protect parts of central Kuala Lumpur where a major flood could affect substantial amounts of real estate, infrastructure and commercial activity.
But its limits are equally important.
The system covers only part of Kuala Lumpur’s flood-prone area and cannot replace local drainage, river management and wider climate-resilience investment.
For KL property, the lesson is that good infrastructure is not only about making a location easier to reach. Sometimes its greatest value comes from keeping that location functioning when conditions are at their worst.
