Construction of a cofferdam nearly 800 m long at the Eastmain-1-A intake was one of his biggest challenges, says Denis Groleau, Eastmain site manager. It had to be built out from the banks of the reservoir by dumping material off the end of the advancing dam into water up to 21 m deep. Photo: Hydro-Québec Related Links: Peaceful Transition: Native people and Hydro-Québec share benefits of big project The key issue was to determine the ideal distance between the advancing face of the crushed-aggregate core and the riprap of the lateral embankments. The solution, he found, was not fancy modeling
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.