4 feet is better, than 20. During Hugo, we had parents putting their kids in the ceiling tiles, of our shelters. These were ceilings in school gyms. The parents just swam around for hours, holding their kids in the ceilings. The water was black, and cold, and there was no power, and just a few old school flashlights. The water will recede, and then you pull the kids down, and start cleaning.
I’ve heard stories about people sheltering inside old logs, or trees. The problem is, if you don’t leave before the storm, you can’t change your mind once the storm is there.
Last year, we were expecting 4–20 ft storm surges during a storm. My friends and I put a bunch of gear in my canoe, and we huddled in a brick house. If the water got higher than our house, a friend of mine and I would have dawned our motorcycle helmets, and armor, and pulled the kids, and women to the nearest available structure. That may seem radical, but that’s coastal living during hurricane season. Most people I know, can’t afford to leave town for every bad storm. People who are confident, experienced, and resourceful, will usually survive these powerful storms. Usually with more experience, and a few stories to tell.