Flooding after Hurricane Katrina (IMAGE) American Geophysical Union Caption Millions of people live behind levees in the United States, and historically underserved and socially vulnerable populations disproportionately live in levee-protected areas, putting them at increased flood risk, as in the aftermath of Hurricane Katrina in 2011. Credit NOAA Usage Restrictions No restrictions. License Public Domain Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.