You can often gauge the quality of a mechanic by taking a close look inside his or her garage. A clean shop is the sign of an organized, patient technician who will treat you fairly and take good care of your investment. A dirty one, well, could promise to take you for a ride. And the old grease monkey’s adage, “You can pay me now, or you can pay me later,” is starting to take on a new socially conscious twist with the emergence of a concept called the “green” garage, where the harsh solvents, oil stains, slippery wrenches 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.