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Research indicates that low altitude, poor drainage, and intense urbanization increase the risk of severe flooding in coastal cities in the U.S., with New Orleans, Houston, and Miami also under growing climate pressure.
New York is at the center of a climate alert involving 4.4 million people exposed to extreme flood damage. The risk affects half of the city’s population and places a significant portion of buildings in critical condition.
The threat is not limited to water advancing over streets near the coast. The survey shows a combination of low altitude, high urban density, insufficient drainage, and proximity to rivers, bays, and coastal areas.
The result places the largest city in the United States among the most vulnerable points on the east coast and the Gulf, alongside New Orleans, Houston, Miami, Norfolk, Charleston, Jacksonville, and Mobile.
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New York concentrates 4.4 million residents in extreme damage areas
The assessment indicates that 50% of New York’s population could face extreme damage if a major flood hits the city. This percentage corresponds to about 4.4 million residents.
The study also points out that 47% of the buildings in the city are in high-risk areas for severe damage. Urban exposure increases the economic and social burden of any extreme event.
In a vertical, dense city surrounded by water, a large-scale flood can impact housing, roads, transportation systems, businesses, and essential services.
New Orleans has 98% of the population in high-risk area
Image credit: imaginewithme, via Getty Images.
New Orleans appears with the highest risk proportionally among the analyzed cities. About 98% of the population, equivalent to 375,000 people, is at high risk of suffering extreme flood damage.
The city’s infrastructure also appears to be almost entirely exposed. The study indicates that 99% of the structures are in vulnerable areas, reinforcing local fragility in the face of storms, high tides, and heavy rains.
The city already carries a history of severe climate disaster. Hurricane Katrina, in 2005, left 1,833 dead and caused deep destruction in entire neighborhoods.
Study A tale of two coasts analyzed 16 risk factors
According to Science Advances, a scientific journal with peer-reviewed studies, the study A tale of two coasts: Unveiling U.S. Gulf and Atlantic coastal cities at high flood risk was conducted by Hemal Dey and Wanyun Shao from the University of Alabama, and crossed historical flood damage data from FEMA, the federal emergency management agency of the United States, with 16 risk factors.
The research used machine learning, a technique in which systems analyze large volumes of data to recognize patterns. This allowed the authors to estimate which coastal areas are most likely to suffer severe damage in major floods.
Among the factors analyzed are land elevation, distance from water, rainfall volume, population density, building height, poverty, and the presence of residents in situations of greater social vulnerability.
Eight coastal cities appear in high or very high alert
In addition to New York and New Orleans, the survey mentions Houston, Miami, Norfolk, Charleston, Jacksonville, and Mobile as cities with elevated risk.
The threat increases in locations with low altitude, poor drainage, intense urbanization, and occupation close to the sea, rivers, or wetlands. This combination hinders water drainage during heavy storms.
Houston and Mobile appear among the points that require priority attention from public managers. The pressure on urban infrastructure may grow as extreme events become more frequent.
Sea level could rise 0.3 meter by 2050 on the continental US coast
The cited projection indicates that sea level along the continental United States coast could rise by up to 0.3 meter by 2050. This rise increases the chance of coastal flooding, especially when high tide and storm occur simultaneously.
The risk also grows with more intense rainfall linked to global warming. Hurricanes and tropical storms can push water into cities and overwhelm drainage systems.
About 30% of counties on the Gulf and Atlantic coasts already face a high risk of flooding. This data underscores the urgency of urban policies focused on climate adaptation.
Dikes, floodgates, and wetlands are part of the response against damage
The authors advocate for combined measures to reduce damage. The list includes floodgates, dikes, embankments, wetland restoration, and reconnection of floodplains to drainage systems.
Another proposal involves replacing impermeable surfaces, such as concrete parking lots, with materials that allow water absorption by the soil. This measure can reduce the volume of water accumulated on the streets.
There is also advocacy for restrictions on urban expansion in high-risk areas. The advance of construction in vulnerable zones increases the exposure of residents, buildings, and public services.
The warning presents New York with a challenge that goes beyond urban engineering. The city needs to deal with millions of exposed people, strained infrastructure, and increasingly costly climate events.
The debate now involves adaptation, planning, and damage reduction. The advance of floods in major coastal cities of the United States changes the strategic understanding of climate, housing, and urban security.
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