While cities like Mumbai face severe waterlogging and disruption after heavy rains, Kolkata’s vast wetlands quietly cushion the impact by absorbing floodwaters and naturally treating sewage—showing a nature-based solution to urban climate challenges.
- East Kolkata Wetlands absorb floodwater and filter sewage naturally
- Supports fisheries and agriculture, sustaining local livelihoods
- A proven nature-based climate solution amid rising urban floods
What happened
In recent weeks, cities across India have experienced relentless and intense rainfall leading to severe flooding, overwhelmed drainage systems, and widespread disruptions. Mumbai’s standstill situation highlighted the challenges faced by urban centers with aging and insufficient infrastructure to cope with increasingly volatile weather patterns.
Meanwhile, Kolkata benefits from the presence of the East Kolkata Wetlands—a large natural ecosystem on the city’s eastern edge. These wetlands absorb excess monsoon rainwater, prevent widespread flooding, and function as a natural sewage treatment system, reducing pressure on conventional infrastructure.
Why it feels good
The East Kolkata Wetlands are often called the city’s "natural kidneys" because they cleanse wastewater through natural processes involving sunlight, aquatic plants, algae, and microorganisms. This reduces pollution and saves energy compared to artificial treatment plants.
Additionally, the wetlands underpin a circular economy by turning sewage into nutrient-rich water used for fish farming and agriculture, which supports thousands of families. Protecting these wetlands preserves biodiversity while sustaining vital livelihoods, showcasing an elegant balance of ecology and economy.
What to enjoy or watch next
As climate change increases the frequency of intense rainfall, urban areas across India could benefit greatly from integrating nature-based solutions like those in the East Kolkata Wetlands. Watching how this ecosystem continues to adapt and protect the city provides valuable lessons for sustainable urban planning.
However, these wetlands face growing threats from urban expansion and pollution. Efforts to safeguard and restore wetlands worldwide are critical, underscoring the need for policies that prioritize natural infrastructure alongside traditional engineering approaches to mitigate flooding risks.