This an elevation map depicting the city of New Orleans. Just another attempt at man trying to defy nature.
Is it so hard to see why major flooding could occur here? Without considering hurricanes, just think about the Mississippi River. In this area, the river should naturally alter the path of it’s flow. As time passes, it deposits the sediments in different areas and essentially starts the process of creating land. Instead, humans have chosen to alter the natural path of the river using flood walls.