Industrial Park



Engineering Assessment of Deformed Spillway Gate

This paper was presented at the 2016 HydroVision International Conference.


Commissioned in 1947, Karapiro Hydro power station has a generating capacity of 96MW and is one of 9 power stations located on the Waikato River in the North Island of New Zealand. The Karapiro power station is owned and operated by Mighty River Power.

After removing the No. 2 spillway gate at Karapiro power station, it was found that the lower section of the gate had undergone permanent deformation. Corrosion on the internal and external surface of the gate was also reported. A fitness-for-service (FFS) assessment was undertaken to determine the acceptability of the spillway gate under current conditions. This paper covers the methods used to determine if the spillway gate was fit-for-continued service.

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