The Midwest, especially the Great Lakes, is known for it's prominent source of water. The Great Lakes consist of 2-% of the world's freshwater source. Conversly, New Orleans main source of water comes from the Mississippi River and the Gulf of Mexico, both of which consist of no freshwater.
The textbook discusses the use of artificial levees in the Midwest, which we all saw fail in New Orleans in 2005. Humans build artificial levees to control floods and protect civilization. There are many levees built surrounding the Mississippi River and Lake Pontchartrain. As we witnessed in Hurricane Katrina, there is a chance of a breakage in the levee system leading to flooding of the entire surrounding areas.
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