#7. Houston, Texas

- Properties at risk in 2020: 186,481 (32% of total properties in the city)

- Projected properties at risk in 2050: 202,317 (34% of total properties)

--- Projected 30-year change: 15,836 (8.5%)

After Hurricane Harvey devastated Houston in 2017, the city passed an ordinance requiring that certain buildings are raised higher than the 500-year floodplain level. Before then, only new homes had to be above the 100-year level. The severity of floods is measured in terms like 100 and 500 years, based on an area’s chances of flooding in a given year.

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