Faced with political opposition and inconsistent rules from state to state, public-private partnerships used to finance public transportation projects lag in the U.S., compared to Europe and Australia, says a new survey by McGraw-Hill Construction, the parent of ENR. The analysis is based on detailed interviews of 75 state and municipal public-works officials with varying levels of PPP experience. About one-third of survey respondents were currently involved with the approach or used it in the last decade. According to the survey, the biggest PPP obstacle is respondents’ perception of “unacceptable profits” by private developers. Other negative perceptions cited are tolling
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.