A woman jogs along a levee along the Mississippi River with the city skyline in the distance on May 16, 2015 in New Orleans, Louisiana. Mario Tama It's been almost 10 years since Hurricane Katrina devastated New Orleans and other parts of the Gulf Coast. But the Crescent City, a cultural treasure that’s home to almost 400,000 people, faces even greater risks in the future.

Most of the city is already below sea level, protected by an unreliable system of levees.

Flood risk will grow more severe as rising sea levels and sinking coastal land produce a local increase of at least four feet by the end of the century. And then there's the inevitable increase in major storm surges caused by extreme weather events.

We've created a guide to the crises ahead and the city's best hope for survival.