Photo by Tom Sawyer for ENR A schoolgirl rides a train in Northern Japan after the multiple disasters. White House photo President Obama and Congressional leaders struggled with transportation funding issues all year. Related Links: Readers' Choice: Most Popular ENR Stories of 2011 The editors of ENR looked back at the stories that stood out in 2011. With business slow and Congress deadlocked, much of the news centered on public works budgets, politics and tough times for unions. Technology continued to reshape communications, criminal indictments put some managers and executives in legal jeopardy, revolutions remade the Arab world and a
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.