Apparently it... well I'll just let them tell it because I know very little about the process:
WASHINGTON – U.S. Senators Johnny Isakson, R-Ga., and Saxby Chambliss, R-Ga., blasted an omnibus spending bill over its inclusion of language that could restrict the U.S. Army Corps of Engineers in its efforts to update its outdated water control plans for the drought-ravaged river basins that serve Georgia, Florida and Alabama. Isakson and Chambliss voted against the spending bill, which passed the Senate Tuesday evening by a vote of 76 to 17.
Voicing their disapproval on the Senate floor, Isakson and Chambliss criticized the broken appropriations process in Congress that allowed the language to be inserted into the spending bill without any debate or consultation of senators from affected states. The language could block the Corps from meeting its statutory obligations and unnecessarily injects Congress into an issue that should remain in the hands of the Governors of the three affected states.