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Top: In the NTNU hydraulic laboratory, Kaspar Vereide and his colleages have built a 1:65 scale model
of an existing hydropower plant with an air cushioned surge chamber. Photo: Anne Olga Syverhuset
Lower: An air cushioned surge chamber works like an airbag. The coloured figure shows a 3D model of
an air cushioned surge chamber. Air is shown in blue and water in red. Figure: Kaspar Vereide