Author(s): Arve Berg

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Abstract: Air entrainment in secondary (brook) intake shafts creates two types of problems in the waterways of hydro electric power plants; blowouts and supersaturation of dissolved air. Blowouts may damage structures and supersaturation may cause gas-bubble disease in fish. Several preventive measures have been suggested to avoid supersaturation. At Driva hydroelectric plant a so-called vacuum gate was chosen. The present article describes prototype measurement of air entrainment and formation of supersaturation both under atmospheric conditions and under reduced air pressure in the shaft.

DOI: https://doi.org/10.1080/00221689209498922

Year: 1992