James Bay Spillways and Control Structures

by Klaus R. Ludwig, (M.ASCE), Chef de Service; La Societe d'energie de la Baie James, Montreal Canada,
Richard T. Olive, (M.ASCE), Specialiste en Structures; La Societe d'energie de la Baie James Montreal, Canada,

Serial Information: Journal of the Energy Division, 1981, Vol. 107, Issue 2, Pg. 183-198

Document Type: Journal Paper


The La Grande Complex, in the James Bay region of Quebec, requires the construction of seven major spillways and two control structures. Spillway design discharges vary from 120 000 ft³/s (3400 m³/s) to 575 000 ft³/s (16280 m³/s). All structures are equipped with fixed wheel gates. The design of the gate structures of all the spillways has been standardized as much as possible, but the water conveyances downstream vary greatly, depending on the peculiarities of the individual sites. Structural rather than hydraulic design is emphasized in the study. The layouts adopted for all the facilities are presented and the bases of design for both the concrete sub-structures and steel super-structures are discussed. The loads, and load combinations, used for stability analyses and detailed design of structural elements are also given.

Subject Headings: Hydraulic design | Bays | Spillways | Structural control | Drop structures | Load combinations | Structural stability | Construction management | Quebec | Canada

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