Vietnam rethinks its flood strategy as climate change drives storms and devastation

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Vietnam rethinks its flood strategy as climate change drives storms and devastation
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Vietnam is rethinking how it copes with floods after a year of relentless storms has collapsed hillsides and turned streets into rivers.

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8, 2025. FILE- A man rows his boat on the fishing field outside the Holcim Vietnam cement company plant near the Moso mountains in Hong Chong, Vietnam, July 1, 2012. FILE- This aerial image shows flooding in the aftermath of typhoon Matmo in Thai Nguyen, Vietnam, Oct. 8, 2025. – Vietnam is rethinking how it copes with floods after a year of relentless storms collapsed hillsides and left vast parts of cities under water. From mapping high-risk areas to reimagining “sponge cities” that can absorb and release water naturally, Vietnam is investing billions to adapt to what experts call a new era of climate extremes. Under a national master plan running through 2030, the government has pledged more than $6 billion to build early-warning systems and move communities out of danger.In smaller cities like Vinh in central Vietnam, these ideas are taking shape. Drainage networks are expanding, flood basins are being carved and riverbanks turned into green spaces that can absorb and then drain off after heavy rains.was gathering strength on its path toward Vietnam this week, scientists warned it may not be the last. It's a glimpse of the country’s climate future — warmer seas fueling storms that form faster, linger longer, and dump heavier rain, hitting the poorest communities hardest. “Vietnam and its neighbors are on the front lines of climate disruption,” said Benjamin Horton, a professor of earth science at City University of Hong Kong.Scientists say the succession of storms battering Vietnam is not a fluke but part of a broader shift in how storms behave on a warming planet. Vietnam usually faces about a dozen storms a year, but the 2025 cluster was a “clear signal” of global warming, said Horton. Ocean waters are now nearly 1 degree Celsius warmer than before the industrial era. So storms carry more moisture.Floods routinely disrupt farming, fisheries, and factories — the backbone of its economy. State media estimate extreme weather has cost the country $1.4 billion in 2025. Vietnam estimates it will need to spend $55 billion–$92 billion in this decade to manage and adapt to the impacts of climate change.About 18 million people, nearly a fifth of Vietnam’s population, live in its two biggest cities, Hanoi and Ho Chi Minh City. Both are on river deltas that once served as natural buffers against flooding. But as concrete spread over wetlands and farmlands, the cities lost their capacity to absorb downpours. Flooding in Hanoi in October lingered for nearly a week in some neighborhoods. The city of over 8 million has outgrown its infrastructure and its colonial-era drainage system failed as streets turned into brown canals. Motorbikes sputtered in waist-deep water and the Red River’s levees were tested. Vegetable seller Dang Thuan's home flooded knee-deep, spoiling her stock. Her neighborhood used to have several ponds, but they were filled in to build houses and roads. Now the water has nowhere to go.In 1986-1996, the decade coinciding with ‘Doi Moi’ economic reforms that unleashed a construction boom, Hanoi lost nearly two-thirds of water bodies in its four core urban districts, according to a study by Kyoto University's Center for Southeast Asian Studies. Between 2015 and 2020, it lost water bodies spanning the area of 285 soccer fields, state media have reported. More than three-quarters of Hanoi’s area — including much of its densely populated core — is at risk of flooding, according to a 2024 study. Flooding in the city can’t be solved by building more, said Hong Ngoc Nguyen, lead author of the study and an environmental engineer at the Japanese consultancy Nippon Koei. “We can’t control the water,” she said, pointing to Singapore’s shift from concrete canals to greener riverbanks that slow and hold stormwater instead of rushing it away.India’s Bengaluru are working to save the city’s remaining lakesThe former director of the National Institute of Urban and Rural Planning, Ngo Trung Hai, told the state-run newspaper Hanoi Times that the city must learn to live with heavy rainfall and adopt long-term strategies. European business associations have urged Vietnam’s financial capital Ho Chi Minh City to adopt a “sponge city” approach. Real estate developers have faced criticism in state media for improper building practices, such as building on low-lying land or roads unconnected to storm sewer systems and treating water bodies as “landscape features” rather than ways to drain storm water. Some of Vietnam’s biggest property developers have begun to adapt. In the coastal tourism hub of Nha Trang, the Sun Group is building a new township modeled as a “sponge city” with wetlands covering 60 hectares , designed to store and reuse rainwater to reduce flooding and absorb heat. City planners must account for future climate risks, said Anna Beswick, who studies climate adaptation at the London School of Economics.The Associated Press’ climate and environmental coverage receives financial support from multiple private foundations. AP is solely responsible for all content. Find AP’sCopyright 2025 The Associated Press. All rights reserved. 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