[elpadre]

I remember many years ago a story about how the population center around Miami had extracted so much from the water table that salt water was filling into the Everglades.

[Vinnie]

I remember many years ago a story about how the population center around Miami had extracted so much from the water table that salt water was filling into the Everglades.

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.

[gundog]

The system of drainage canals around Homestead worked both ways. Salt water can come in and fresh water was going out. Florida Bay was dead. The ‘Glades once mitigated the effect.