Atlanta needs to do something to address the needs of its expansion, not just stop expansion. There’s a lot of water offshore from Savannah. It’s a little salty.
It is a solution. The question is how necessary in the long term would it be?
Yes it would be nice to have NOW. But droughts don't last forever. They rarely last more then a half a decade. So the question is whether the city is willing to make that kind of capital investment for a once a century occurrence.
Desalination is EXTREMELY expensive.
So is pumping 500,000,000 gallons of water 1000 feet vertically every day.