Low-lying cities like Copenhagen are becoming spongy

Cities all over the world are recognising the need to adapt to the reality of climate change and rising sea levels. While traditional concrete solutions are no longer sufficient, the challenge is not how to fight water but how to work with it.

A recent article by Yale Environment 360 highlights that the shift in Copenhagen is already underway. Following a devastating flood in 2011, the city changed its approach to stormwater through the adoption of Sponge City principles, transforming its urban fabric into a nature-based, water-responsive systems.

Rather than relying solely on concrete barriers and underground pipes, Copenhagen has introduced a distributed network of green and blue infrastructure. Parks, wetlands, lakes, and bioswales are designed to slow, store, and redirect rainwater during extreme weather events, creating a more sustainable drainage system.

Beyond flood mitigation, these interventions bring broader benefits. Public spaces are reshaped into greener, more liveable environments, supporting biodiversity while also providing cooling relief during warmer months.

The results are already measurable, with flood risk in key areas reduced by 30–50 percent. Yet the approach is not without limitations. In dense urban centres, space constraints and costs can challenge implementation, and some argue these systems are less effective during extreme rainfall events.

First introduced in 2013 by Yu Kongjian, the Sponge City concept continues to gain traction globally. While not a singular solution, it provides an alternative to continued reliance on traditional concrete barriers and sewage systems.

Read the full article about Copenhagen in Yale Environment 360.