Related Links: Immigration Bill Focus Shifts to House After Senate Vote Target vs. Walmart -- Which One Is a Better Place to Work? With worker pay and benefits under pressure—according to one analysis, the average earnings of a construction worker relative to other occupations has slipped significantly since 1990—it's understandable that the building trades unions would drive a hard bargain before giving their blessing to an immigration reform bill. The process is far from over, but Senate Democrats almost certainly consulted this important constituency while drafting the version of the immigration reform bill the Senate adopted. The House of Representatives
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.