Overview
The southwest monsoon this year has been unusually intense over western India. Moisture‑laden winds crossed the Western Ghats and dumped large amounts of rain on the Konkan coast and Mumbai. The city, built on reclaimed marshland, faced rapid flooding because its drainage cannot cope with short‑burst, high‑intensity rainfall, especially when combined with high tides.
Key Developments
- Heavy rains overwhelmed river catchments in Nashik and caused landslides in the Bhor Ghat, suspending Mumbai‑Pune rail services.
- High tides reduced the efficiency of storm‑water drains, leading to waterlogging on the Mumbai‑Ahmedabad expressway and other highways.
- Five children died when a chawl collapsed in Mankhurd, highlighting unsafe construction.
- Transport corridors – Mumbai‑Pune expressway, Mumbai‑Goa highway and Mumbai‑Ahmedabad expressway – were closed or severely disrupted.
Important Facts
• Mumbai received 944 mm of rain in 24 hours during the July 2005 floods – a benchmark that guided the BRIMSTOWAD upgrades, many of which remain incomplete.
• The BMC has issued advisories to halt hazardous construction, but enforcement gaps persist.
• Forecasting is handled by the IMD.
• Disaster response is coordinated by the NDRF.
• Climate change is altering monsoon patterns, making extreme events more frequent and challenging existing infrastructure designs.
Exam Relevance
Understanding Mumbai’s flood scenario links to multiple GS papers. The event illustrates the impact of