oa Civil Engineering = Siviele Ingenieurswese - An emergency valve for a dam

Volume 5, Issue 2
  • ISSN : 1021-2000



When it was found impossible to employ the emergency gates to cut off pressure prior to repair work on the outlet valves of the Njelele Dam, a hollow concrete ball was used as an alternative emergency valve. The circumstances are outlined in this short paper which descriptionbes also the making and handling of the concrete ball.

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