As long as Georgia collects the water before it crosses in into Tennessee, I see no reason that Georgia shouldn't be able to use the water. The biggest issue would be inter-basin water transfer. Besides, it is only in times of prolonged drought that Georgia rainfall doesn't amply supply all of Georgia's needs. The only reason Alabama is suing Georgia over water rights is to try to strangle Atlanta's growth so Birmingham could capture some of the economic bounty of company's concerned about locating operations in Atlanta - fail. Charlotte is the only city that company's would consider in the southeast for a southeast regional office (Nashville is great for a eastern regional office due to it's central proximity but most company's are structured into NE/SE/SW/midwest and west coast operations). The real beneficiaries of a prolonged water war would be Dallas and Phoenix from Atlanta losing non-geographic based HQ's or operation centers.