I was in Galveston, Texas a month after Hurricane Ike to visit relatives and also to see how much damage the hurricane had caused in the city.
There was damage due to flood waters but nothing that couldn't be dealt with. Everyone kept telling me that they were saved thanks to the Galveston seawall. If the seawall hadn't been there, the damage would have been immense. Many lives would could have been lost and my family could have been among them.
I personally think a seawall needs to be constructed for all coastal cities. We experience some kind of a hurricane practically every year. Too many people and their properties have already suffered from these disasters. Seawalls cannot be too expensive to build and they are a great protective barrier. It's worth the investment.