If Boston were hit by a storm surge half the height of the one that hit Manhattan
Kiss every single bit of Boston that sits on landfill from the past 300 years goodbye: Back Bay, the South End, East Boston, half of South Boston, large swaths of Dorchester. See this flood map, which assumes a 5-foot storm surge on top of water levels 2.5 feet higher than today's levels.
So how about some giant barriers stretched across the harbor?
Via Rich Beaubien.