Southern California will spend hundreds of millions of dollars to repair water treatment and wastewater treatment infrastructure damaged in the April 4 Baja Earthquake, which was registered at 7.2 magnitude, state and city officials say. In the city of El Centro, Director of Public Works/City Engineer Terry Hagen estimated that local public and private interests sustained $25 million in damage, although that estimate could grow. As many as 24 condominium units were evacuated when four of six 2-inch-dia anchor bolts sheared off an empty landmark, a 1924-era water tank. The city awarded an emergency $77,000 contract to remove the tank
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.