Evacuation doesn't have to mean all 6.5 million have to leave, just those in low lying areas. It also doesn't have to mean leaving the city, It looks like the d

Evacuation doesn't have to mean all 6.5 million have to leave, just those in low lying areas. It also doesn't have to mean leaving the city, It looks like the downtown area has plenty of tall buildings that would make for some high density evacuation areas and have rooftop helicopter access for emergencies and food/water drops.