Mumbai's ₹37,000 Crore Metro Line 3 Faces Monsoon Challenges

Heavy rainfall has exposed vulnerabilities in Mumbai's ₹37,000 crore Metro Line 3, raising concerns about its climate resilience and disaster preparedness. Authorities are deploying plastic sheets and makeshift concrete walls to prevent water ingress, while experts call for better flood-proof engineering.

Mumbai MetroClimate ResilienceInfrastructureWater IngressMonsoonReal Estate MumbaiJun 02, 2025

Mumbai's ₹37,000 Crore Metro Line 3 Faces Monsoon Challenges

Real Estate Mumbai:Mumbai’s flagship underground Metro Line 3, constructed at a staggering cost of ₹37,000 crore, is under sharp public and expert scrutiny after heavy rainfall exposed vulnerabilities in its infrastructure. Less than a week after water seeped into the newly operational Acharya Atre Chowk station, authorities were seen deploying plastic sheets, tarpaulin covers, and makeshift concrete walls to defend critical commuter entry points against further water ingress. This patchwork response contrasts starkly with the project’s otherwise high-tech promise.

The monsoon-triggered flooding at a major station on the Aqua Line has not only disrupted services but also raised fundamental questions about the metro’s climate resilience, disaster preparedness, and long-term sustainability in a city frequently battered by torrential rains. Despite the metro being a crucial component in the broader agenda of shifting Mumbai towards cleaner, low-emission mobility, the early onset of rain has proven to be a stress test for a system that is still incomplete.

Site inspections across several Aqua Line stations, including those at Bandra-Kurla Complex (BKC) and Marol, reveal that temporary fixes like tarpaulin drapes and plastic coverings are being used to prevent rainwater from entering through ground-level openings. Some locations have hastily erected reinforced cement concrete (RCC) bund walls, and others are relying on sandbag perimeters. While these interventions may provide immediate relief, experts point out that they signal gaps in long-term hydrological planning and flood-proof engineering. According to officials at the Mumbai Metro Rail Corporation Limited (MMRCL), damage assessment and rectification work began promptly following the incident. Restoration is expected to be completed within days, they stated, with temporary bunds being constructed to counter surface runoff. MMRCL also claimed that all dewatering pumps across stations are fully operational and that no current water accumulation exists within any metro premises.

But for commuters and urban planners alike, confidence has been shaken. Multiple passengers who spoke after last week’s flooding recounted experiences of being stranded or rerouting their travel entirely. One commuter, previously a regular on the newly opened underground route, said she had reverted to a longer, multi-modal surface route to avoid the risk of being caught underground during sudden cloudbursts. Another passenger, who travelled recently with his family, admitted he only boarded the metro because the skies were clear. He referred to online videos of water streaming down staircases as “deeply unsettling” and questioned whether the system was truly monsoon-ready.

Urban infrastructure experts argue that while minor leaks and faults are not uncommon in large-scale transit projects during initial operations, the nature of Mumbai’s climate demands a higher level of precaution. “There should have been a rigorous monsoon simulation and drainage stress test before commissioning even partial operations,” noted one senior transport analyst, pointing out that entry/exit designs at ground level must factor in Mumbai’s unique surface runoff behaviour. Importantly, not all Metro 3 stations were affected. Officials clarified that most of the water ingress issues occurred at locations where entry points are flush with the road, without raised platforms or elevated staircases. However, this very design flaw is what has amplified concerns — particularly in a city where even minor rainfall can lead to temporary flooding due to saturated drains and uneven topography.

For a project of such magnitude and significance, the optics of plastic sheets and cement bags being deployed in haste undermines public trust. The Metro Line 3 — a key spoke in Mumbai’s shift to eco-conscious public transport — is envisioned to carry more than 1.6 million commuters daily when fully operational. If the system falters in early rain, critics argue, it risks undermining years of investment in sustainable urban mobility. From a policy standpoint, the incident reiterates the urgent need for transit infrastructure to embed climate resilience as a core principle. Metro systems in flood-prone cities like Tokyo, Singapore, and Amsterdam incorporate layered waterproofing, underground pressure valves, and sophisticated runoff redirection systems. Stakeholders in India’s infrastructure ecosystem are increasingly calling for similar rigor and climate-adaptive design here, especially for capital-intensive transport corridors.

Government officials have stated that the flooding is being treated as an isolated incident, not systemic failure. Nevertheless, citizen confidence hinges on visible and credible action. There have been calls from transport unions and civic groups for independent audits of the Aqua Line’s monsoon preparedness before further extensions of operations. Until then, trust in Mumbai’s most expensive mass transit line remains tentative. While the Metro 3 project continues to represent an essential piece in Mumbai’s low-carbon future, its readiness to operate safely during the city’s most challenging season remains under the spotlight.

As the monsoon deepens over the next few weeks, both the engineering and institutional resilience of the Mumbai Metro will face further scrutiny — with lakhs of daily commuters watching closely.

Frequently Asked Questions

What caused the water ingress in Mumbai Metro Line 3?

Heavy rainfall led to water seepage into the newly operational Acharya Atre Chowk station and other ground-level entry points, exposing vulnerabilities in the metro's infrastructure.

What temporary measures are being taken to prevent further water ingress?

Authorities are deploying plastic sheets, tarpaulin covers, and makeshift concrete walls to defend critical entry points against water ingress.

How has the flooding affected commuter confidence?

Commuter confidence has been shaken, with many reverting to longer, multi-modal surface routes to avoid the risk of being caught underground during cloudbursts.

What are experts saying about the design of Metro Line 3's entry points?

Experts argue that entry/exit designs at ground level must factor in Mumbai’s unique surface runoff behavior and should have undergone rigorous monsoon simulation and drainage stress tests.

What changes are being called for to improve the metro's climate resilience?

Stakeholders are calling for layered waterproofing, underground pressure valves, and sophisticated runoff redirection systems to enhance climate resilience in Mumbai's metro infrastructure.