The method of control of water in open excavations by pumping from sumps, from deep wells, or from well points is such an accepted practice that sometimes little attention is given to its complex and difficult hydraulic nature.This paper describes the causes leading to a hydraulic failure of a 15 m deep temporary sheeted cofferdam required to found a concrete slab for a pump house. The construction of the new pump house was for the extension of facilities of a sewage treatment plant. The piping failure caused a considerable construction delay and it also served as a field case to reassess the construction procedure of the excavation and the inadequacy of the well point installation.
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Bauer et al. (1980) studied this question.