All develop in the ocean. Cities on the coast are damaged by some of these storms but by others. In 2005, New Orleans was hit by Hurricane Katrina. Many people left, or , but others were not so . New Orleans is in a low area of land, with water all around it. The city has wall-like structures, or , to keep water out. These structures are a real ! In 2005, flood water broke through and did damage. Engineers will make the levees stronger in the .