The 2010 ICOLD Bulletin on Geomembrane Sealing Systems for Dams (ICOLD Bulletin No. 135) supersedes and greatly expands upon two earlier versions published in 1981 and 1991. The 265 dams incorporating geomembranes cited in this new bulletin are 183 fill, 47 concrete, 34 roller compacted concrete, and 1 hybrid. Of the total, 118 (45%) are in Europe, 48 (18%) are in the United States, 47 (18%) are in China, and the remaining 52 (19%) are scattered in other countries and locations. Since most of the experience gained to date is in Europe, the European Working Group on Geomembranes prepared the bulletin with the assistance of the primary author of this paper. This paper attempts to summarize the 242-page bulletin and is subdivided according to the same structure contained therein. The bulletin concludes with a brief section on quality control and another on guidance for technical content of contracts. The bulletin is published in both English and French.
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