Environment

New Report Says FEMA Badly Underestimates Flood Risk

41 million Americans—not 13 million—are at risk of experiencing a 100-year flood, according to the study.
A house partly submerged by flood waters from Tropical Storm Harvey in Rose City, TexasJonathan Bachman/Reuters

Over the past 30 years, the United States has suffered an average of $8.2 billion in annual damage from freshwater flooding. Studies show that the destruction is intensifying every year. The August 2016 floods in Mississippi and Louisiana, for example, inflicted $10 to $15 billion in damages.

The wrath of Hurricane Harvey sparked debate over how the country manages flood insurance and brought fresh scrutiny on incentives for new construction on the country’s precarious floodplains. But meaningful reform faces a hurdle: the Federal Emergency Management Agency’s flood hazard maps. These maps dictate flood risk management in the U.S., and they’ve been widely criticized for being outdated and underestimating the country’s flood risk.