OK, lets travel from the West to the East along the coast in Hurricane Zones. Brownsville, Corpus Christie, Galveston, New Orleans, Gulfport, Mobile, Pascagoula, Pensacola, Panama City, Tampa, Sarasota, Miami all the way to Palm Bay, Savannah, Wilmington, Virginia Beach, and Ocean City are all cities over 50,000 people that sit in the midst of a hurricane threat. Some sit below sea level. To protect all these cities from erosion and storm surge by damming technology would be potentially the biggest project in US history.
This project would only be feasible in a few places, but in reality the entire coastline has residents who are subject to hurricanes. That's just one of the hazards we have to deal with.
You know that's not what I mean, so don't put words in my mouth.