Staff Correspondent

Traditional monsoon weather patterns are undergoing a drastic transformation in Bangladesh, shifting the geographical vulnerability of floods from river basins directly into the heart of major urban centers. Experts warn that climate-induced rainfall anomalies are turning waterlogging into a major national disaster risk, exposing severe infrastructure and coordination gaps across municipalities.

The changing reality has manifested bitterly this month. On July 7, the port city of Chattogram recorded a staggering 412mm of rainfall in a single day—its highest daily downpour in four decades. Just a week later, nearly 97mm of rain paralyzed the capital city of Dhaka, leaving key commercial zones and roads submerged under knee-deep water for hours.

Urban Vulnerability: Intense short-duration rainfall is consistently overwhelming city drainage networks ; shifting Climate Signals: Extended dry spells are increasingly disrupted by violent, concentrated bursts of extreme rain.;structural Failures: Massive depletion of wetlands, clogged natural canals, and unplanned urban construction are intensifying the crisis and institutional gaps: Ineffective synchronization among state utility and local government bodies impairs rapid flood responses.

Historically, July and August spelled danger primarily for coastal and riverine basin districts. However, this monsoon season has rewritten the script. While seven districts—Khagrachhari, Rangamati, Bandarban, Cox’s Bazar, Chattogram, Moulvibazar, and Habiganj—faced intense flash floods and landslides, major urban spaces like Dhaka and Chattogram buckled entirely under intense rainfall.

According to official figures from the Ministry of Disaster Management and Relief, the ongoing monsoon wave has affected approximately 609,000 people across 59 Upazilas and 12 municipalities. Cox’s Bazar logged the highest toll with 31 fatalities, prominently including 13 Rohingya refugees caught in hillside mudslides. Chattogram reported 13 deaths, while Bandarban and Rangamati registered six and three casualties respectively.

Professor AKM Saiful Islam of the Institute of Water and Flood Management at BUET emphasized that urban flooding must now be formally categorized alongside river flooding as a primary disaster threat.

"This year, a moisture-heavy monsoon low-pressure system from the Bay of Bengal dropped around 850mm of rain over just three days in Chattogram," Prof. Saiful observed. "Draining that volume within such a short timeframe is structurally impossible given our current urban design".

Experts attribute the compounding urban crisis to human-induced ecological damage. Rapid, unplanned urban expansions have seen critical urban wetlands and natural drainage retention territories filled with commercial concrete.