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Intense storms are on the rise and cities across the world are finding it difficult to cope with deluges of floodwater. But instead of using high-tech, concrete-based engineering solutions to defend against the vagaries of the climate crisis, the Chinese landscape architect and urban planner lets nature do the work.
For over a decade, Yu and his firm Turenscape have designed nature-based “sponge cities” intended to soak up and retain stormwater before releasing it back into the environment. Varied in form and scale, the projects create new parks, restore wetlands and install rain gardens and permeable pavements, among much else.
The Role of ETFs in Indian Stock Market Investment Trusted Financial Forecasts ✌️【Risk Avoidance】✌️ Free stock data analysis to help you select stocks accurately and capture market trends. The problem with concrete- or pipe-based solutions that funnel water away from flooded areas is that they are expensive, lack flexibility and require constant maintenance, Yu said. They may also, counterintuitively, make placesmore“sensitive or vulnerable” to flooding, he argued, comparing cities that rely on conventional flood mitigation to a person whose veins and arteries have hardened. Just as reduced blood flow causes heart attacks, blockages and overflows in urban drainage systems can have devastating knock-on effects.
“There’s a misconception that if we can build a flood wall higher and higher, or if we build the dams higher and stronger, (then) we can protect a city from flooding,” Yu told 【 - Free Stock Market Analysis Courses 】 in a video call. “(We think) we can control the water… that is a mistake.”
Yu’s proposal is this: Create areas with porous earth where local plants can thrive with little or no maintenance. If it rains, the earth and plants soak up the water and prevent some (or even all) of it from flooding nearby areas. Any excess water that is not absorbed will at least be slowed by the vegetation — unlike concrete, which can instead dangerously speed up water flow, Yu said.
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Floods present a growing problem in China, with Chinese leader Xi Jinping calling the task of controlling them “increasingly arduous” in late June. According to a 2021World Bank report, 641 of China’s 654 largest cities face regular flooding. This has partly been attributed to rapid urban development, which has created sprawl that encases floodplains in impermeable concrete.
China’s vulnerability to flooding has been thrown in stark relief this summer. In June, southern parts of the country were hit by flash floods and deadly landslides following torrential rain, with tens of thousands of people evacuated. Last month,similar devastationplayed out across China’s heartlands as multiple provinces declared emergency alerts and dozens of people were killed amid scenes of deadly bridge collapses, cities submerged in water and emergency responders in speedboats racing to rescue stranded residents.
But whether this latest flooding crisis demonstrates the limitations of China’s sponge cities, or supports the case toexpandthem, is a matter of debate.
Yu wants cities to move away from the grand infrastructure solutions often favored by governments and construction companies, and towards smaller-scale alternatives. They may be cheaper, too: The sponge city program in Wuhan, for example, cost more than 4 billion yuan ($550 million) less than a concrete-based approach, according to apolicy briefby the UK’s University of Leeds.
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In China’s tropical island province of Hainan, for instance, Turenscape transformed an old concrete sea wall, a barren fish farm and a nearby brownfield site into a “breathing sea wall” that absorbs the force of the ocean and acts as a buffer against flooding for a nearby commercial district.
The Role of ETFs in Indian Stock Market Investment Trusted Financial Forecasts ✌️【Risk Avoidance】✌️ Free access to real-time stock market data analysis, global market trends, and expert predictions. Capture emerging opportunities and grow your portfolio steadily, with insights into metals, energy, and agricultural products. The sea wall was reshaped to accommodate terraced planters, while the fish farm’s ponds and dikes were turned into a mangrove habitat. Inland, porous green space helps slow the flow of water and absorb storm surges. It has withstood several tropical storms over the past two years, according to Turenscape.
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Yet, some experts have suggested that sponge city infrastructure struggles to cope when rain exceeds 200 millimeters (7.9 inches) a day. For example, Meizhou, in Guangdong, has been designated a sponge city but experienced some of thesummer’s most severe floodingafter heavy rains that saw one town experience 369.3 millimeters (14.5 inches) of rain in a single day, according to the Chinese state media outlet Global Times. (Turenscape did not create any of the sponge projects in the city.)
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Beyond flood mitigation, sponge cities may offer other environmental benefits. Chan said that sponge parks could help reduce urban temperatures and address water shortages, as well as providing pleasant environments for residents.
“The government wants to restore the environment and… (improve) urban ecology,” he said. “But not just that — they want to … collect rain and use it, because water is very scarce in the city.”
In Wuhan, where more than 380 sponge projects — including urban gardens, parks and green spaces — absorb and divert rain water to artificial lakes, local air quality and biodiversity were found to have improved since they were constructed. Lower temperatures were also recorded at the city’s Yangtze River Beach Park, where 45,000 trees and other vegetation sequester an estimated 724 tonnes of carbon per year.
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Last year, The Cultural Landscape FoundationawardedYu the $100,000 Oberlander Prize in recognition of his pioneering work.
“He was one of the very first people, (and Turenscape) one of the first practices, to really work with these ideas that we have to understand and harness natural processes and make landscapes that do (the) work, like cleaning water, mitigating floods, reducing urban temperature or stabilizing fragile soils,” Elizabeth Mossop, chair of the prize’s jury and dean of the University of Technology Sydney’s School of Design, Architecture and Building.
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“The threats and the impact of climate change, and the experience of climate uncertainty is absolutely on top of us right now,” Mossop said. “We actually do know how to do a lot of these things, we do have that kind of data. We are being slowed down by political and social and cultural processes.”
Like Yu, she suggested that sponge cities’ shortcoming is that they are not, yet, far-reaching enough.
“I think the frustration is that we feel like we have the answers… If these ideas could be adopted more widely, they would go a long way to addressing many of the current threats.”
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