Mumbai’s railway network, a lifeline for millions, has long grappled with the menace of monsoon-induced flooding. In response, the Mumbai Railway Vikas Corporation (MRVC) has initiated a comprehensive flood vulnerability and mitigation assessment aimed at safeguarding the city’s rail infrastructure during the monsoon season.
Drawing inspiration from global engineering marvels, MRVC is exploring the feasibility of implementing underground holding ponds akin to Tokyo’s Metropolitan Area Outer Underground Discharge Channel (MAOUDC). These 70-metre-tall underground facilities, completed in 2006, serve as floodwater cathedrals, storing excess rainwater during high tide to prevent surface flooding. Such innovative solutions are being considered to address Mumbai’s unique challenges posed by its coastal geography and urban density. Mumbai’s geographical location, flanked by the Arabian Sea and Thane Creek, places its suburban rail networks along the periphery, causing rainwater to pass through outlets below railway tracks before entering the sea or creek. Blockages and silting of railway bridges and culverts have significantly reduced their ability to drain water. The accumulation of plastic, garbage, and other litter exacerbates these issues, leading to frequent waterlogging on tracks during heavy rainfall.
Recognising the need for a coordinated approach, MRVC is collaborating with the Brihanmumbai Municipal Corporation (BMC) to enhance the city’s drainage capacity. BMC plans to upgrade its stormwater infrastructure to handle rainfall intensities of up to 120mm per hour, a significant increase from the current capacity. Additionally, officials have identified 80 new flood-prone areas across the city, underscoring the urgency of infrastructural improvements. To mitigate immediate flooding risks, BMC has introduced mobile dewatering pumps. These vehicle-mounted units, each capable of draining 250 cubic meters of water per hour, are strategically deployed in flood-prone areas. This initiative aims to provide swift relief during emergencies, ensuring better water drainage during heavy rains.
In the long term, both MRVC and BMC are investing in infrastructure upgrades. Measures include the construction of micro-tunnels to facilitate better water flow, the installation of boundary walls to prevent water overflow onto tracks, and the development of pucca drains to ensure proper water drainage. These efforts are part of a broader strategy to enhance urban resilience and ensure the uninterrupted functioning of Mumbai’s rail network during the monsoon season. The focus on sustainable and eco-friendly solutions aligns with the broader goal of creating zero-net carbon, gender-neutral, and equitable urban spaces. By integrating innovative engineering practices with collaborative governance, Mumbai aims to transform its rail infrastructure into a model of resilience and sustainability, ensuring safe and reliable transportation for all its residents.
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