The U.S. Dept. of Transportation has launched what surely will be a tough competition for the second round of Transportation Investment Generating Economic Recovery (TIGER) grants to help fund projects that aim to produce major regional or national transportation benefits. DOT has $600 million in fiscal 2010 appropriations for the new batch of grants. Demand was huge for the $1.5- billion first TIGER round, which was funded by the American Recovery and Reinvestment Act. That initial group of grants, whose winners were announced on Feb. 17, drew more than 1,400 proposals totaling about $60 billion. DOT’s funding-availability notice, published in
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.