Actually the intrusion of salt water into the Florida aquifers due to large fresh water demands by agriculture and a booming population mean that Florida running out of fresh water certainly can happen. Porous sediments can only accommodate so much water at once (which is why you get run-off, floods etc) so the excess water from large storms flows right back into rivers & the ocean, where it does you no good. Additionally, due to density/pressure contrasts, once salt water has claimed a section of aquifer, fresh water will never reclaim that zone again (at least by normal natural means). It's not a problem specific to Florida, it's something many coastal areas are also dealing with. Florida just happens to have a much larger population on a much larger coastline than other places.





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