Related Links: Study Finds Big Cost Overruns on Global Dam Megaprojects The 10 Largest-Capacity Hydropower Plants A recent study on global large-dam projects by Oxford University's Saïd Business School says large-dam projects experience cost and time overruns and suffer a very low cost-benefit ratio and concludes that small-dam projects are better. However, in its argument against large dams in favor of small dams, the study provides a rationale for fossil-fuel energy plants. The International Commission on Large Dams finds the results of this study to be deeply flawed. The main weakness is its focus on time and cost overruns without
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.