I just checked the flow guage on the chattahoochee river. Its at 34,200 cfs and rising at 15,420 cfs/hr. This river normally flows about 1500cfs this time of year. I just saw it crested the 285 bridge. That is amazing. The larger rivers are probably not going to crest for a while. The rain has subsided but not the flooding. Still a lot of water up north that has to make its way down. Not out of the woods yet.
To give you an Idea this would be like switching from a 100gph pump to a 3500gph pump in a lot larger scale.