U.S. Transportation Secretary Ray LaHood on April 4 called on states, regulators and utilities to replace or repair aging oil and gas pipelines to avoid catastrophic spills and explosions. LaHood wants the DOT and its regulatory body, the Pipeline and Hazardous Materials Safety Administration, to increase the maximum civil penalties for pipeline violations to $250,000 per day from $100,000 and, for a series of violations, a onetime $2.5 million fine instead of $1 million. LaHood also is asking Congress to prepare legislation to help close regulatory loopholes, strengthen risk-management requirements, add more inspectors and improve data reporting to help identify
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.