Photo By AP Wideworld Weak, underdesigned wood power-line poles are a common point of failure in extreme-weather events, such as Superstorm Sandy. The national election and the aftermath of Superstorm Sandy provide a double measure of poignancy to this week's issue—the fifth in ENR's critical-infrastructure series of special reports. This installment, planned months ago, focuses on the electrical grid. Although infrastructure had not been part of the political conversation prior to this storm of storms, we hope the disaster in the Northeast U.S. refocuses public concern.With its twin assault of wind and storm surge, a tempest of this size and
Arch dams, classically curved monoliths situated in narrow valleys, are not as common as other types of dams, such as embankment dams and gravity dams. ENR takes a look at some of the biggest arch dams in the world, both completed and under construction.