A new report by the World Bank says $93 billion a year is needed over the next decade to bolster infrastructure in Africa. The analysis of roads, ports, power and water utilities, information- and communication-technology networks, and airports in 24 African countries found nearly $45 billion a year currently is being spent on infrastructure in Africa. Most of that is being financed by African taxpayers and consumers. However, inefficiencies in the continent’s infrastructure systems is causing money to be wasted. The study concludes that addressing inefficiencies and waste in Africa’s infrastructure systems could yield an additional $17 billion in available
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.