A San Francisco civic group is seeking support for an ambitious, 50-year plan, called the Resilient City Initiative, that could help minimize loss and speed recovery after the “Big One.” The initiative can serve as a model for disaster preparedness and recovery for all earthquake-prone communities, say sources. Photo: USGS A pre-quake retrofit might have limited damage and allowed a repair rather than a razing. While developed for San Francisco, the resilient-city concept of the nonprofit San Francisco Planning and Urban Research (SPUR) Association has “application anywhere a city is trying to deal with natural hazards,” said Chris Poland, chairman
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.