New York City’s Urban Assembly School of Design and Construction, a public high school, hosted its first “Iron Designer” competition on June 18 on the roof of its midtown building. Photo: James Blum Team works to determine the best use of the secret material—glass tiles. Composed of students partnered with architectural and engineering firms professsionals, 10 teams competed to build the best safe house: a life-size emergency shelter. The organizers limited each team to a handful of common materials and a threehour deadline. The school envisions the challenge becoming an annual fund-raising event. On the day before the competition, the
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.