Every monsoon season, Dhaka experiences a persistent but catastrophic paralysis. Millions of people who commute are stranded, supply chains are disrupted, and businesses of all sizes are suffering significant financial losses as heavy rain transforms the capital's major commercial streets into rivers. Urban waterlogging persists as a structural failure, despite decades of municipal budget allocations and annual water-purification campaigns. Reactive sewage treatment is no longer an option in Dhaka, as climate change increases rainfall variability throughout South Asia. Bangladesh must look to international urban design standards to keep its economic engine running. Singapore, a low-lying, densely populated tropical city-state, provides a particularly rigorous example of how a high-density urban economy can systematically engineer its way out of systemic crises.
Dhaka's waterlogging crisis is essentially an engineering and governance failure, which is often presented as a natural disaster. Historically, the landscape was supported by a natural network of over 50 interconnected khals (canals), low-lying wetlands, and floodplains that organically channelled stormwater into the surrounding Buriganga, Turag, Balu, and Shitalakshya rivers. This natural drainage topography has been gradually dismantled due to urbanisation. Massive concrete expansion has reduced the city's permeable surface area to negligible levels, leaving stormwater with little soil infiltration capacity. The fragmented institutional landscape exacerbates this physical bottleneck. Responsibilities are divided among the Dhaka North and South City Corporations, WASA, and RAJUK, resulting in disjointed and uncoordinated interventions. When infrastructure projects are designed separately, the overall hydrological network suffers.
In the 1970s, Singapore experienced severe flash floods that affected thousands of hectares of its urban core. The Source-Pathway-Receptor strategy is a comprehensive framework that has reduced flood risk in flood-prone areas by more than 99%, even in the face of heavy tropical rainfall. PUB, Singapore's National Water Agency, has divided stormwater management into three phases rather than concentrating on the construction of larger concrete dams. Large residential and commercial developments are required by law to install on-site storm-control systems that comply with strict building codes. These include permeable pavements and underground storage tanks that temporarily collect rain where it falls and release it gradually into the public network to prevent the main watercourses from being overloaded during heavy rain.
Singapore has abandoned traditional concrete canals in favour of its Active, Beautiful, Clean Waters (ABC Waters) Programme. The state transformed the rigid concrete canals into flowing natural rivers that have been integrated into urban wetlands. They function as physical barriers to reduce water flow, absorb excess volume, and filter urban runoff in a natural manner.
Infrastructure such as a marina barrage is required at the point of discharge. It serves as a city-wide tidal dam and storage tank, with automatic levees and large pumps, to protect the internal sewerage network from rising sea levels. During periods of heavy rainfall that coincide with high tides, massive pumps actively push storm runoff into the sea, reducing the possibility of its recirculating.
If Dhaka wants to replicate Singapore's success, structural policy reforms must take priority over ad hoc solutions. First, the fragmentation of urban water management must be addressed. Bangladesh requires a unified, scientifically based urban water authority to manage all aspects of the capital's hydrological cycle, such as canal renewal, drainage, and flood control. Second, source control mechanisms must be included in building codes by regulatory bodies like RAJUK.
Finally, the restoration of Dhaka's remaining natural canals (khals) should be prioritised macroeconomically. Long-term flood protection will be improved by restoring these channels and incorporating special green buffers, rather than relying solely on underground concrete pipes. If Dhaka is to maintain its current growth rate, it must transition from treating stormwater as an annual issue to managing it as an organised urban resource.
Ananta Proshad Chakraborty is a postgraduate of Nalanda University and a research intern at the Society for Asian Circular Innovation Network (SACIN).
anantapcb@gmail.com
