Yes. Fresh water in the 'Glades has to maintain 3 ft. of 'head' to prevent salt water intrusion.
The fresh water being pumped out of the ground for the population is causing the intrusion.
At least that's what I've read.
Draining the Florida swamp to make all of that sub-tropical real estate in the 30’s came at a cost. Homestead was cris’crossed with canals dug by what amounted to giant ditch witches grinding through coral. Great place to be a walking catfish.
Seems like it would be a two-fer...