Lower Manhattan is visible through a closed chock on the Staten Island 

Lower Manhattan is visible through a closed chock on the Staten Island Ferry, in New York's Upper Bay, Tuesday, June 11, 2013. Giant removable floodwalls would be erected around lower Manhattan, and levees, gates and other defenses would be built elsewhere around the city under a nearly $20 billion plan proposed Tuesday by Mayor Michael Bloomberg to protect New York from storms and the effects of global warming. (AP Photo/Richard Drew)
Associated Press
Lower Manhattan is visible through a closed chock on the Staten Island Ferry, in New York's Upper Bay, Tuesday, June 11, 2013. Giant removable floodwalls would be erected around lower Manhattan, and levees, gates and other defenses would be built elsewhere around the city under a nearly $20 billion plan proposed Tuesday by Mayor Michael Bloomberg to protect New York from storms and the effects of global warming. (AP Photo/Richard Drew)
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