How New Orleans handled Hurricane Ida after post-Katrina changes

Here are the changes New Orleans has adopted after Hurricane Katrina, and where holes in hurricane preparedness persist.

When Hurricane Ida made landfall in Louisiana, it put storm preparedness measures that were put in place after Hurricane Katrina to the test. A $14 billion system of fortified levees and floodgates that were launched after Katrina successfully protected New Orleans from flooding. But at the same time, other infrastructure, including the power grid and water system, failed. Nearly 1 million remained without power Wednesday, thousands are without water, and hundreds have been rescued from submerged neighborhoods. The levee and floodgate system