Maryland's transportation secretary, John D. Porcari, is President Obama's choice to hold the number-two post at the U.S. Dept. of Transportation, the White House announced on April 10. His nomination is subject to Senate confirmation. PORCARI Porcari has led Maryland DOT since 2007, his second stint in the job. He also was the state agency's secretary from 1999 to 2002. Both times he served under Democratic governors. Between those two periods, Porcari was the University of Maryland's vice president for administrative affairs. Jane F. Garvey, former head of the Federal Aviation Administration and acting Federal Highway Administration chief in 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.