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
The market is generally healthy and steadily growing, and margins are up for large specialty contractors. Further, advances in design tools and owner demand for collaboration are giving subcontractors a seat at the table early on in projects.