Falling behind: On Mumbai and the monsoon
The southwest monsoon has been highly active over western India, with southwesterly winds loaded with moisture sweeping over the Western Ghats and delivering intense rains along the Konkan coast, while other weather systems offshore are routing more moisture over Mumbai and the surrounding areas. In urban areas in general, rainfall intensity matters more than volume. Mumbai itself can generally absorb moderate rainfall over several hours; however, its drainage — like in many Indian cities — cannot handle several hundred millimetres in short bursts. Heavy rainfall also overwhelmed river catchments in parts of Maharashtra, including around Nashik, while high tides reduced the efficiency of Mumbai’s stormwater drainage, worsening flooding in the city. Mumbai-Pune rail services were suspended after landslides in the Bhor Ghat and flights were affected. The closures of the Mumbai-Pune expressway and the Mumbai-Goa highway and significant flooding on the Mumbai-Ahmedabad expressway were disruptive, speaking to the increasing erraticity of monsoon rainfall, the vulnerabilities associated with linear infrastructure projects, and the ease with which the effects of natural disasters are compounded by cascading failures. A chawl collapse in Mankhurd took the lives of five children. Mumbai lies on a peninsula built mostly on reclaimed land, former marshes, tidal flats, and low-lying coastal areas, creating the characteristic risk of higher flooding when rainfall coincides with high tide. It is compounded by decades of haphazard urbanisation that has encouraged water to run-off rather than be absorbed by the ground, forcing drains to handle more water than their design limits. After the July 2005 floods , when it received 944 mm in 24 hours, Mumbai launched the BRIMSTOWAD project and widened drains, installed pumping stations, and undertook premonsoon de-silting. Many of these works remain incomplete while some completed upgrades are based on assumptions about the monsoon that climate change has since undermined. Officials have also argued that pre-monsoon desilting helped reduce flooding in parts of Mumbai, but water on the Mumbai-Ahmedabad expressway, the chawl collapse, deadly tree falls in Kurla and Aarey, lack of redundancies in public transport, and the BMC’s belated advisory to builders to halt hazardous construction all suggest a governance lapse. Mumbai’s accountability also remains split across the BMC for local drainage and roads, the IMD for forecasting, the NDRF, two Railway zones, the State government, and highway authorities. Overall, the city has improved at shutting down to save lives and minimising the death toll — but as climate change and urbanisation evolve faster than infrastructure upgrades, simply waiting for system capacity to catch up to demand will be a failing strategy. Monsoon / mountains / Mumbai / rains / Pune / Goa / Ahmedabad / road transport / natural disasters / flood / government
- 1Urban flooding is fundamentally a question of local governance under the 74th Constitutional Amendment of 1992, which added Part IXA and the Twelfth Schedule to the Constitution, listing urban planning, water supply and drainage among eighteen municipal functions. The Brihanmumbai Municipal Corporation is India's richest civic body, yet the editorial shows responsibility fractured across the BMC, IMD, NDRF, Railways and the State government. Effective devolution of functions, funds and functionaries to municipalities remains the unfinished agenda of Indian federalism.
- 2Mumbai's crisis mirrors a national urban policy gap, since missions such as AMRUT and the Smart Cities Mission, both launched in 2015, prioritised visible infrastructure over drainage and flood resilience. The Disaster Management Act of 2005 created the National Disaster Management Authority chaired by the Prime Minister, with State and District authorities below it, moving India from relief-centred to preparedness-centred disaster governance. The editorial shows this architecture still struggles when climate risks outpace infrastructure planning.
- 3After the July 2005 deluge, the Maharashtra government appointed the Chitale Committee, whose recommendations shaped the BRIMSTOWAD drainage overhaul that remains incomplete two decades later. Legal instruments relevant here include the Environment (Protection) Act of 1986, the Wetlands (Conservation and Management) Rules of 2017, and Coastal Regulation Zone notifications that restrict construction on tidal flats. Courts and the National Green Tribunal have repeatedly linked illegal reclamation and wetland destruction to urban flooding liability.
- 4The July 2005 floods dumped 944 millimetres of rain on Mumbai in twenty-four hours and killed more than a thousand people in Maharashtra, making it one of India's costliest urban disasters. Mumbai generates a substantial share of national output and tax collections, so every shutdown of its rail lines, expressways and airport carries economic losses running into thousands of crores. Climate science projects that warming increases short-duration extreme rainfall, meaning drainage designed for past averages will keep falling behind.