The U.S. Army Corps of Engineers has released a draft study outlining $10 billion in projects to protect the city of Boston from extreme weather and sea-level rise over the next several decades. The Corps estimates the city could face $54 billion in losses by the end of the century if it does nothing. But for every $1 invested, the public sector could save at least $4 in avoided costs, according to Corps estimates. Dark purple indicates flooding with intermediate sea-level rise, while light blue shows the expanded inundation area under a high sea-level rise scenario. The task force plans to finalize its financial blueprint by next summer, coinciding with the Corps' final feasibility study.