Taking its cue from the U.S. Green Building Council’s LEED building certification program, a new Illinois initiative seeks to incorporate sustainable design and construction practices into state road and transportation projects. Like LEED, the Illinois-Livable and Sustainable Transportation (I-LAST) Guide establishes a scoring system for planning, design and construction to “preserve natural resources and encourage low-impact forms of transportation,” says Doug Knuth, project chair with the American Council of Engineering Cos. of Illinois, which developed I-LAST in association with the Illinois Dept. of Transportation and the Illinois Road and Transportation Builders Association. The program is the latest in a growing
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.