A group of forensics experts led by some professors from UC Berkeley released a damning 738-page report on the levee failures during hurricane Katrina. They found a system that was "pervasively flawed" (surprise, surprise), and said that the failure was at all levels of government, including the Feds, the local levee board, and to a lesser extent the Army Corps of Engineers.
The website below contains a .pdf (adobe acrobat file) of the entire report
