time-logoTime Magazine has a story about a request by the Army Corps of Engineers that the EPA and FEMA not disclose the location of coal ash ponds.  It seems that the EPA and FEMA were assessing the hazard posed by these ponds after a spill in Kingston, Tennessee that covered 300 acres in sludge and destroyed or damaged 40 homes on December 22, 2008.  Since then, it has been concluded that 44 of these ponds across the country, used to store waste from coal fire power plants, pose a high hazard to the surrounding public.  After making this assessment public, the Corps of Engineers requested that the EPA and FEMA not disclose the location of these ponds, much as the National Dam Inventory had been removed from public access after 9/11.  The reason for both of these moves is, of course, to make it more difficult for terrorists to identify good targets.

The problem with this approach of making hazards confidential is that it does nothing to remedy the original threat.  The high hazard coal ash ponds and dams are still out there and people are still vulnerable with or without the aid of terrorism.  Will anyone be moved to do anything about these hazards if the public does not know the danger they are already in?  Admittedly, the high hazard status does not necessarily mean that these structures are an imminent threat to fail, but necessary supervision and maintenance is much easier to put off if the public is not aware of its importance.  Doesn’t this more mundane and everyday threat trump the extraordinary one of terrorism?  Moreover, would public knowledge lead to construction of fewer of these high hazard structures in the first place, thus making the terrorism concern moot in the first place?  It’s something to consider.

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Construction workers used saws to remove the broken pipe alongside Bethesdas River Road in December. The 66-inch-diameter pipe had been placed directly against jagged rock instead of in the required bed of gravel. (By Sarah L. Voisin -- The Washington Post)

Construction workers used saws to remove the broken pipe alongside Bethesda's River Road in December. The 66-inch-diameter pipe had been placed directly against jagged rock instead of in the required bed of gravel. (Image By Sarah L. Voisin -- The Washington Post)

ASCE alerted me to this story in their latest news brief.  It was a reminder as to why we do the things we do as engineers as well as the problems that we face with aging infrastructure.  This 66-inch water pipe exploded under pressure.  It is thought that installation next to jagged rock put undue stress on the pipe much as one would experience by having a knee pressed into one’s back.  The pipe should have been over-excavated and placed on a bed of gravel.  The wonder is that it took 44 years for this mishap to occur.  I expect more such ticking time-bombs will come to our attention as they cannot escape the clock and our infrastructure isn’t getting any younger.

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