“Katrina: After the Flood.” By Gary Rivlin. Simon & Schuster. 480 pages. $27.

Ten years ago this month, Hurricane Katrina slammed into New Orleans, unleashing one of the most unforgettable natural and political disasters of the new century. Rivlin, who covered the unfolding post-storm crisis for The New York Times, now looks back to see how the city and its people did – and didn’t – recover in the years since, and consider the lessons about wealth, poverty, race and good government.