WASHINGTON (Reuters) -- Virtually everything that has happened in New Orleans since Hurricane Katrina struck was predicted by experts and in computer models, so emergency management specialists wonder why authorities were so unprepared. "The scenario of a major hurricane hitting New Orleans was well anticipated, predicted and drilled around," said Clare Rubin, an emergency management consultant who also teaches at the Institute for Crisis, Disaster, and Risk Management at George Washington University. Computer models developed at Louisiana State University and other institutions made detailed projections of what would happen if water flowed over the levees protecting the city or if...