The states have been squabbling for years, and the situation only grew worse as last year’s drought drove levels at Lake Lanier — Atlanta’s main water supply — perilously low. When that happened, Georgia Gov. Sonny Perdue did more than pray for rain (though he did that, too): he asked the feds to let his state hold back more water in its reservoirs rather than maintain federally mandated river flows into Alabama and Florida.

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