The Dalsung Weir Project involves the construction of a composite concrete weir and bridge structure across the Nakdong River, southwest of the city of Daegu in Korea. This structure is part of the grand Four Rivers Restoration Plan of Korea. To construct the weir structure dry work platforms have to be created to allow construction works to be carried out. The weir structure was constructed in three stages. The first stage involved the middle section. The second stage involved the section connecting the middle section to the southwestern bank of the river while the third stage involved the section connecting the middle section to the northeastern bank of the river. For each section, temporary cofferdams were constructed to create a dry work platform on the riverbed, while the river was allowed to flow adjacent to the area surrounded by the temporary cofferdams. Geotextile tubes were used as part of the design for the first and second stage temporary cofferdams. The primary function of the geotextile tubes is erosion protection of the temporary earth cofferdams. The geotextile tubes also served as retaining structures, Thus allowing steeper overall side slopes to be built safely for the temporary earth cofferdams.
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