Not sure about our elevation here; at my home nearer the coast (about 10 miles inland) we're 14 feet above sea level. I think I remember hearing that we're about 32 feet here in Okeechobee, which is about 50 miles inland.
However, the altitude qabove seal level is not the determining factor; it's the height above the ground water table. In the areas pictured, the ground water table is about 4" to 8" above the ground. It goes down in the winter, and is high every spring/summer with the rainy season, but for the past 3 years, we have had an exceptional amount of rain, and the ground is increasingly saturated.
The ground is essentially flat; the water has nowhere to run. It either seeps into the ground if the water table is low enough, evaporates, or sits there. This year, it's sitting there. The only long term solution is to raise the ground enough that it DOES run off somewhere. In this case, it's to the highway drainage ditch to the North, the street swale to the East (which runs into the highway ditch), or to my neighbor's property to the South. I'm trying to avoid that, and attempting to build up the South side enough to have it drain North. Unfortunately, I also have to build up the North side high enough to keep the highway ditch from backflowing onto my property. This, of course, means that the South side has to be raised even more. I doubt I will ever have enough dirt to fix all of it, all of the time.
We bought the property in a "normal" year after being familiar with it for the previous 6 years my daughter and family had lived next door. The flooding this year is extraordinary, but I'm not counting on it returning to "normal" anytime soon. Thus, I raising as much as I can afford to raise.