12/5/2023 0 Comments Nyc flood zone map![]() ![]() Many inland areas, including swaths of Appalachia and numerous major cities, saw big jumps. Overall, the results, which cover the contiguous United States - including areas the government hasn’t yet mapped for flooding, and places where the federal maps are decades old - show a vast increase in risk compared with official estimates. The foundation then checked its results against a national database of flood claims and historic flood paths. The First Street Foundation created its flood model, called Flood Factor, using federal elevation and rainfall data, and coastal flooding estimates from hurricanes. “Millions of home and property owners have had no way of knowing the significant risk they face,” said Matthew Eby, founder and executive director of the First Street Foundation, a group of academics and experts based in New York City who compiled the data, creating a website where people can check their own address. And minority communities often face a bigger share of hidden risk. In Chicago alone, 75,000 properties have a previously undisclosed flood risk. Numerous cities nationwide - as diverse as Fort Lauderdale, Fla., Buffalo, N.Y., and Chattanooga, Tenn. If the new estimates are broadly accurate, it would mean that homeowners, builders, banks, insurers and government officials nationwide have been making decisions with information that understates their true physical and financial risks. The federal government’s flood maps guide where and how to build, whether homeowners should buy flood insurance, and how much risk mortgage lenders take on. A 100-year flood is one with a 1 percent chance of striking in any given year. That new calculation, which takes into account sea-level rise, rainfall and flooding along smaller creeks not mapped federally, estimates that 14.6 million properties are at risk from what experts call a 100-year flood, far more than the 8.7 million properties shown on federal government flood maps. It corresponds neatly with much of the 311 data, while also filling in some gaps, such as areas which likely flooded in East New York.Across much of the United States, the flood risk is far greater than government estimates show, new calculations suggest, exposing millions of people to a hidden threat - and one that will only grow as climate change worsens. ![]() It doesn’t take into account factors such as disparate volumes of rainfall in different parts of the city, or uneven street drainage quality, which would also contribute to flooding after a specific weather event. This map shows how low lying areas with little green space to soak rainfall suffer the highest flood risk due to rainfall. With this information in mind, I added the NYC’s Extreme Stormwater Flood Map, which was released by the Mayor’s Office in May 2021. Conversations with community leaders suggested that depending on demographics and geography, many people almost never call 311-either due to lack of familiarity or to low expectations of a government response.ģ11 calls made during the week following Hurricane Ida (blue) and the week following Hurricane Henri (red) from NYC Open Data This data was illustrative, but didn’t quite match the reports I’d heard of extensive flooding in East New York. To identify blocks heavily impacted by the storm, I first pulled 311 calls made during the week following Hurricane Ida from NYC Open Data and mapped them with QGIS. That’s why we’re identifying blocks hit particularly hard by the storm and talking to residents living there about their firsthand experiences from the hurricane. The economic toll of damaged cars, water heaters, and identification documents critical for immigrants’ employment, government programs, and assistance, hasn’t been accounted for yet. I’ve begun meeting with local community organizers in Central and East Brooklyn to considers the long term economic effects of the hurricane as well. Protestors using life vests to depict Hurricane Ida’s casualties, from Sunrise NYC’s Twitter Account: Immediately after the hurricane, New Yorkers responded to the hurricane by both calling on their electeds for infrastructure investment and hitting the streets to provide care, clothing, foods, and help cleaning debris. The damage was devastating, killing at least 27 people in New Jersey and 16 in New York City. On August 21st, 2021, barely a week after New York City experienced record-setting rainfall from Hurricane Henri, that record was shattered by remnants from Hurricane Ida. ![]()
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