I hear from many that this is very good and worth seeing. Its on HBO out here. Not sure how you get it elsewhere.
GU has a good review
"But later the inadequately maintained levees, or flood walls, broke and a city below sea level was catastrophically submerged. A president anxiously focused on the "war on terror" was all too slow to respond, apparently unable to decide if conspicuous federal intervention would make him look strong or weak. Days passed, and TV pictures of starving, dying Americans made the US look like a third world country - or perhaps, arguably, disclosed the third world country that America secretly keeps in its closet."