Dhaka Faces Severe Waterlogging Amid Rapid Wetland Loss and Concrete Expansion

Dhaka is facing severe waterlogging and urban paralysis following heavy rainfall, a crisis driven directly by blocked drainage systems and a catastrophic loss of natural soil permeability. As concrete continues to replace natural landscapes across the region, the city's infrastructure struggles to cope with standard precipitation events, leaving critical thoroughfares submerged and communities isolated during storms.

The root of this escalating crisis lies in unprecedented and unchecked urban expansion over the past several decades. Statistical evaluations reveal that dense settlement areas within Dhaka expanded by a staggering sevenfold between 1980 and 2024. This massive demographic and infrastructural push has transformed the topography of the metropolitan region into an overwhelmingly artificial expanse.

Environmental assessments indicate that over 80 percent of the land in Dhaka is now entirely covered in concrete, while impermeable surfaces exceed 90 percent in many specific areas. Consequently, green cover has been squeezed to slightly over 9 percent of the total land area, severely limiting the ground's natural ability to absorb rainwater and mitigate urban flooding.

Natural waterbodies and wetlands, which once acted as vital drainage basins and ecological buffers, have been systematically degraded or filled in. According to data from the Bangladesh Institute of Planners (BIP), waterbodies currently make up less than 3 percent of Dhaka's total area. Furthermore, Change Initiative reports that the Dhaka metropolitan area has lost 60 percent of its water reservoirs between 1980 and 2024, down from a time three decades ago when wetlands accounted for more than 20 percent of the city's total expanse.

Specific historical metrics underscore the rapid disappearance of these aquatic lifelines, showing that wetlands in the main Dhaka city area shrank from 9,556 acres during the Detailed Area Plan formulation in 2010 down to 6,073 acres by 2019. The decline is mirrored in smaller urban water features, with Fire Service data illustrating that the number of ponds plummeted from 100 in 2018 to just 29 remaining by 2023.

As Dhaka struggles with the consequences of its heavily engineered landscape, international counterparts provide alternative models for sustainable urban water management. Cities such as Berlin and Wuhan are currently utilizing innovative 'sponge city' concepts to enhance rainwater management, absorbing and filtering excess water through natural processes rather than relying exclusively on conventional concrete drainage networks.