From the NY Times:
The technology of movable sea barriers, from Stamford’s modest flap gate to London’s mighty 10-gate system in the River Thames, has long intrigued engineers and planners contemplating a solution for low-lying areas of New York City. The notion is that such a system could one day block surges from Long Island Sound and the Atlantic Ocean into the East River and New York Harbor.
Now, in the aftermath of the devastating storm, one question is front and center: Should New York armor itself with steel and concrete at a cost of billions of dollars?
Experts whose barrier designs and studies from a conference in 2009 were issued on Monday in book form argue that anything short of sea gates would be a “Band-Aid” approach.
Mayor Michael R. Bloomberg has expressed wariness about the barrier proposal, saying he is not sure the gates would work well enough. Yet, it is clear that his administration’s view is evolving.