This blog excerpt was written by Sam Schwartz, the former New York City traffic commissioner and head highway and bridge engineer who is now chief executive of Sam Schwartz Engineering in New York City. The responses, posted anonymously by ENR.com readers, have been edited for clarity and fit. SCHWARTZ Los Angeles Mayor Antonio Villaraigosa recently went national with his 30/10 transportation initiative, a plan to speed up a dozen projects by using federal loans to leverage proceeds from a half-penny sales-tax increase approved by California voters. The national plan is called “America Fast Forward.” It is supported by a—gasp!—bipartisan coalition
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.