One of the concerns over global warming is the rise of oceans and flooding of coastal communities. We hope that we can arrest this problem before it floods, but if not it is certainly not impossible to raise our low level communities. Here is how Chicago did it many years ago.
Raising Old Chicago
The city of Chicago is just above Lake Michigan. There was little natural drainage. Standing water festered and caused living epidemics including typhoid fever and dysentery.
The crisis forced the city install storm sewers. Much of the city was raised several feet to the new grade. Homes, sidewalks, and streets were raised. Older homes were moved to other lots and new homes were constructed.