Tidal floods only a feet or two deep have become routine for many coastal areas of the United States. In parts where the land is also sinking, like the entire Chesapeake Bay region, including the City of Norfolk, the coming years will see flooding events that will be worse than average. To avoid damage to vital infrastructure and real property, the City may have to construct sea walls and install movable gates along waterways, reports Justin Gillis in the New York Times.