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Dam safety and rebuilding – a Swedish engineering perspective
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Hydraulic Engineering. (Vattenbyggnadshydraulik)
Vattenfall AB.
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2006 (English)In: Proceedings of Hydropower 2006 International Conference, Chinese National Committee on Large Dams , 2006, 67-79 p.Conference paper (Refereed)
Abstract [en]

The large-scale development of hydropower in Sweden started immediately after the Second World War and reached its peak during the 1950’s and 1960’s. When the dams were built, there were no prescribed criteria for determination of their design floods, and the discharge capacity of many spillways was underestimated. Dam safety was at that time not a subject of state regulatory surveillance, and there were no national directives governing the dam design, construction and supervision. The responsibility rested with the dam developer. With the updated flood guidelines released 1990, many dams have been found to have up to 50% higher design floods than constructed for. As required by the dam-safety guidelines RIDAS, many existing dams, especially high-hazard ones, have to be rebuilt, an issue that involves large capital investment and takes many years to accomplish. The engineering measures include spillway modification, new spillway gates, raising dam crests and/or impervious cores, new erosion protection upstream embankment dams, reinforcement of dam body and re-shaping and strengthening of waterways including stilling basin enlargement. Quite often several rebuilding measures are combined so as to achieve a technically feasible and economical solution. A few dams are given as example to illustrate the rebuilding as imposed by RIDAS.

Place, publisher, year, edition, pages
Chinese National Committee on Large Dams , 2006. 67-79 p.
Keyword [en]
dam safety, design flood, spillway capacity, rebuilding
National Category
Civil Engineering
URN: urn:nbn:se:kth:diva-179787OAI: diva2:889452
Hydropower 2006, Oct 2006, Kunming, China

QC 20160104

Available from: 2015-12-25 Created: 2015-12-25 Last updated: 2016-01-04Bibliographically approved

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