Rehabilitation of spillway and intake guides and gates

Operating problems are fairly common at some of the ageing vertical lift intake and spillway gates at many of the older hydroelectric generating stations (GS) in Canada. The problems result from deteriorated or corroded gate guides and roller assemblies. In 1989, the KGS Group reviewed several viable, cost-effective options for rehabilitation. The remedial measures have since been used by several Canadian utilities including Manitoba Hydro, Hydro-Quebec, Ontario Hydro, SaskPower and Winnipeg Hydro. Projects currently underway include: Beauharnois GS intake, Kelsey GS spillway, McArthur GS spillway, Slave Falls GS intake, Island Falls GS intake, Chenaux GS intake, Abitibi Canyon GS intake and Des Joachims GS intake. This paper presents the results of the inspection/assessment of gates and guides and provides details of the overall concepts and rehabilitation methods for the gate and intake guide repairs being implemented at each of these stations. 5 refs., 1 tab., 6 figs