Although they are not a definitive solution, they offer a way to live more sustainably with the environment. China is at the forefront of this innovation, showing how the integration of nature into urban infrastructure can make a significant difference in the quality of life in cities.
Amid the challenges posed by climate change, China is adopting an innovative approach to make its cities more resilient to flooding. The concept of “sponge cities” is being implemented in various regions of the country, combining natural infrastructure with advanced engineering techniques.
What Are Sponge Cities?
Sponge cities are designed to absorb and reuse rainwater, reducing the risk of urban flooding. These cities utilize urban parks, such as the one in Nanchang, filled with native trees and volcanic rocks, to create an effective natural drainage system. The goal is to improve urban drainage and flood prevention while also creating a biologically diverse environment.
Biodiversity plays a crucial role in defending the Earth against climate change. Healthy cities, with forests and native plants, are essential for carbon dioxide absorption and supporting crop pollination. However, continuous urban expansion can lead to habitat loss and negatively impact global biodiversity.
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While an average building in London or New York takes three years to be completed, in China a 26-story tower went up in five days with about 100 workers, and the global modular construction market already moves US$ 95 billion per year.
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International bridge of R$ 214 million between Brazil and Argentina will be 950 meters long, feature customs complexes, and promises to replace slow ferry with a minutes-long crossing on the border Uruguay River by 2030.
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France transformed 100 shipping containers into 24-square-meter student apartments, creating a four-story building in Le Havre with kitchens, bathrooms, large windows, and affordable local student rent.
Implementation of Sponge Cities in China
In 2015, China launched a pilot program in 30 cities to promote the construction of sponge cities. Architects and engineers are reintegrating natural solutions, such as rain gardens and native trees, to complement the existing gray infrastructure. These solutions are inspired by ancient drainage systems that had already proven effective in stormwater management.
Despite the benefits, sponge cities face limitations; in 2021, the floods in Zhengzhou revealed that these systems have a limited capacity to absorb water. We can also say that the implementation of sponge infrastructure varies significantly from city to city due to climatic, hydrological, and socioeconomic differences.
Adaptation of Cities in the USA
In the United States, cities like Los Angeles and Boston are adapting the concept of natural infrastructure, using existing green spaces. They are experimenting with planting vegetation on sidewalks and creating green spaces in medians. According to Folha, flooding has increased in the U.S., and some incidents have even led to fatalities; in Brazil, it is no different, and we eagerly await innovations similar to those in China in our country.


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