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  •  Rotting foundations after Sandy (4+ / 0-)

    New Scientist magazine has (behind a no-links wall) a depressing article on how New York could rot from the foundations up as a result of the Sandy flooding.

    Basic case: the city is build of reinforced concrete. Normally the steel reinforcements in the concrete are protected against corrosion as they develop a protective patina. But flooding by seawater is allowing salt water to seep through to some reinforcements.  This removes the patina. Furthermore the ions in salty water  can generate a weak electric current between different parts of a metal bar that allows for an accelerated rusting process.

    Raising sea levels will present a long-term salt water challenge to coastal infrastructure.

    Article available to registered users (free) until 16 November 2012 and permanently to paid subscribers.

    Violence is the last refuge of the incompetent.

    by saugatojas on Sun Nov 11, 2012 at 01:30:02 PM PST

    •  more from the article (0+ / 0-)

      thanks SAUGA . I registered @ new scientist + copy pasted article into word doc for future access

      more from article (regarding engineering solutions)

      < "The ultimate risk is that we do not see what's happening, so we cannot take action at the right place at the right time," Ghandehari says. "It's like not getting a check-up, and then all of a sudden having a heart attack." >

      < Engineers are already developing new diagnostic tools. Small robots can explore gas lines. Electric lines can be probed with an electromagnetic pulse, the speed and shape of which changes if it encounters any defects. And water pipes can be inspected using ultrasound. >

      < But for new pipes, Ghandehari suggests a much lower-tech solution: put utility lines in tunnels that human workers can walk through. "The rule of thumb is that you need to have access for inspection," he says. "Cities of the future should consider how to deal with providing access to the urban lifeline." >

      Masoud Ghandehari is a civil and environmental engineer at the Polytechnic Institute of New York University
      Lisa Grossman + Michael Marshall are authors of the article

      •  London Uk partially on to walk-on solutions (2+ / 0-)
        Recommended by:
        Photon Algae, JeffW

        As part of the preparations for the recent London Olympics there was a massive investment in wider infrastructure in east London. This included putting things like power lines underground.

        The new utilities are in walk-through tunnels allowing inspection.

        Violence is the last refuge of the incompetent.

        by saugatojas on Sun Nov 11, 2012 at 02:10:13 PM PST

        [ Parent ]

        •  Now all we need are watertight substations... (0+ / 0-)

          ...that won't explode when under water.

          Float like a manhole cover, sting like a sash weight! Clean Coal Is A Clinker!

          by JeffW on Sun Nov 11, 2012 at 02:49:10 PM PST

          [ Parent ]

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