A current study, known as the Future of Babylon project, documents the damage from water mainly associated with the Euphrates River and irrigation systems nearby. The ground is saturated just below the surface at sites of the Ishtar Gate and the long-gone Hanging Gardens, one of the seven wonders. Bricks are crumbling, temples collapsing. The Tower of Babel, long since reduced to rubble, is surrounded by standing water.
http://www.nytimes.com/2010/03/23/science/23babylon.html?scp=2&sq=burnham&st=cse
