Speaking as a waterfront Floridiot …
It’s trivial to build hurricane & storm surge proof housing & commercial, even right near the water’s edge. It is NOT trivial to rip up all 15 million existing coastal houses, condos, and apartments in Florida to build new such housing in its place. Plus of course all the commercial buildings that need to be torn down and replaced too.
The incremental cost is the real problem. Like double current practice, which for new construction in the last 20 years is already wind-hardened, if not overland flooding hardened. Any given spot along the coast gets a minor hurricane every 10 years and a major hurricane every 25 years. Minor = some flooding and tree & roof damage. Major = many buildings significantly damaged, some destroyed. How much are we really willing to pay to stop twice-per-lifetime damage from occurring to any given individual’s stuff?
As we see with the various Caribbean islands, there are two sorts of topography with different storm hazards. Mountainous islands receive insane rainfall rates and volumes on the high terrain which produces widespread mudslides, avalanches, and swollen river flooding. Conversely flat islands where the highest terrain is as 12 feet above sea level experience widespread seawater inundation of 5-15 feet a mile or more inland. Yo pays yo money …
FL is an example of the latter. Thank goodness it isn’t mountainous like e.g., the Carolinas, or we’d see whole cities swept away by mudslides.
Some thoughts about evacuation in general as applied to hurricanes.
My home is near, but not on, the beach. Those on / nearer the beach are planned to evacuate in Cat 1 & 2 storms. We are planned to evacuate in cat 3 & 4 storms. As @Max_S said, above, none of this is a secret: our county emergency management department publishes detailed maps of their plans. Our job is to do as told when told, if not before.
The intent of evacuation is not to drive across or out of the state. It’s to drive 1 or 2 miles inland and stay with friends, or in a shelter, or in a hotel. That’s how you escape high water. As the motto goes: “hide from wind, run from water.”
If every person who lived >2 miles inland had one friend who lived closer to shore and who they’d be willing to shelter for a few days, we’d need zero publicly funded shelters. We (society as a whole) don’t have that. We certainly have the numbers; we don’t have the social connections. There is a very definite socio-economic gradient as you go inland. Beachfront is rich, near-beachfront is semi-rich, next is working poor, then middle class, then increasingly comfortable class until you hit the inland limit of development at the Everglades. Lots of reasons the social strata don’t interact.
The challenge with schools, etc., as shelters is that it’s easy to build a building impervious to wind. A bit expensive at first, but trivial otherwise. But unless you’re willing to truck lots of dirt in from a hundred miles away, it’s difficult to build an artificial hill 10 or 20 feet tall to build that wind-proof building on. Height is the one and only defense against flood water. And when you need to go 20 miles inland to gain 10 feet of elevation, the flooding is shallow but very extensive in area.
If developers were required to build every house or building on a 10-foot rise with the dirt obtained from digging the roads a couple feet lower than the natural grade we’d be mostly done. Property damage from flooding would be negligible except right adjacent to the beach. With suitably armored utilities we’d keep the power on and the internet & water & sewer running normally. Once again the larger problem is replacing the existing 15 million non-elevated houses and condos and apartments with new elevated ones. And replacing the wind- and flood-endangered utilities with fully hardened ones. Doing new construction right is easy by comparison.
In a current shelter you can expect room for a sleeping bag, a couple meals a day, and that’s about it. Surrounded by hundreds of equally miserable people and their kids and in many cases their animals. It’s not staying at a Holiday Inn, much less staying at a Hilton. It’s more like jail. It’s hardly surprising this unpleasant situation is not popular with anyone but the truly desperate.
The solution to badly inadequate quantities of miserable quality shelters is simple: vast amounts of public money paid for by the taxpayers. Simple, but politically impossible. If I was to live here 50 years and pay taxes for a suitable shelter for me every single year, I’d use it for about 10 days over the course of a full life. Simply not cost-effective.