Unplanned Urbanization Worsens Flooding in Bangladesh Amidst Heavy Rains

Recent heavy rainfall has submerged large parts of Bangladesh, with the met department recording significant rainfall in Dhaka and Chattogram in early July. The deluge has resulted in at least 51 fatalities and left one million people homeless across the country. The relentless downpour severely disrupted traffic, halted daily activities, and forced the closure of businesses and educational institutions.

While the heavy rain is a contributing factor, experts point to unplanned urbanization as the core issue exacerbating the flooding, alongside climate change. As urban areas expand, natural landscapes like wetlands, canals, and vegetation have diminished. This transformation reduces the land's ability to absorb water, leading to increased surface runoff and more frequent waterlogging.

Bangladesh faces the challenge of managing monsoon rains, but the article argues for building more resilient cities. Key recommendations include protecting wetlands, restoring natural canals, increasing permeable surfaces, and improving waste management systems. The "sponge city" concept, successfully implemented in cities like Wuhan and Shanghai, offers a model for absorbing, storing, and reusing rainwater, thereby reducing the strain on drainage systems.

Implementing solutions like permeable pavement, which allows rainwater to seep into the ground, could significantly reduce surface runoff. Urban forests also play a crucial role by absorbing rainwater, improving groundwater recharge, and mitigating urban heat. Restoring Dhaka's neglected canals, which are often encroached upon or poorly maintained, is also vital for effective urban drainage. By learning from international examples and prioritizing nature-based solutions in urban planning, Bangladesh can better prepare its cities for the impacts of heavy rainfall.