US States by Mean Elevation, from 
http://www.answers.com/topic/list-of-u- ... -elevation
FL: 30m; LA: 30; AL: 152; GA: 180m
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Some other Atlanta Info, from 
http://en.wikipedia.org/wiki/Atlanta
Atlanta is the capital and largest city of Georgia, a state of the United States of America. It is the county seat of Fulton County, although a portion of the city (the 1909 annex) is located in DeKalb County, and most of the airport, which is within the city limits, is in Clayton County. According to the latest census estimates (as of December, 2004), the city had a population of 425,000 and the fast-growing Atlanta metropolitan area totaled 4,708,297, making it the ninth-largest metropolitan area in the United States and the 41st-largest city proper.
At about 1000 feet or 300 meters above mean sea level, Atlanta sits atop a ridge south of the Chattahoochee River. Amongst the 25 largest MSAs, Atlanta is the third-highest in elevation, slightly lower than Phoenix and 1 mile (1,600 m) high Denver. Though now somewhat offset by the urban heat island effect, this still results in a climate more moderate than many other cities in the South of the U.S., despite its common nickname, "Hotlanta". At 33 degrees 39 minutes north, Atlanta lies at approximately the same latitude as Los Angeles, Phoenix and Casablanca.
The 
(continental) divide line enters Atlanta from the southwest, proceeding to downtown. From downtown, the divide line runs eastward along DeKalb Avenue 
(and the various Ponce de Leons) and the CSX rail lines through Decatur 
(, Clarkston, Stone Mountain, and points east). Rainwater that falls on the south and east side runs eventually into the Atlantic Ocean while rainwater on the north and west side of the divide runs into the Gulf of Mexico.
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If Atlanta floods, there'll be bigger issues at hand, I think.