oa Civil Engineering = Siviele Ingenieurswese - Shaft spillway design as applied to the Ebenezer dam



The Department of Water Affairs often has to build on inferior dam sites which present engineering problems requiring ingenuity for their solution. The paper deals with the factors that finally lead to the choice of a shaft spillway in the case of the Ebenezer Dam and descriptionbes how the site problems were solved by its use. After dealing with aspects of structural safety such as over-loading erosion, cavitation and vibration that have influenced the general acceptance of shaft spillways, the hydraulic elements of design are descriptionbed and their application is shown in the design of the funnel, the bend, the horizontal shaft and the stilling basin. The loading factors taken into consideration in the structural design, and the manner in which the concrete specification and the design were moulded to fit, the site conditions and loading requirements, are then covered. Finally the results of model tests carried out to confirm the discharge and flow conditions of the shaft spillway as designed are supplied.


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