Cofferdam
From BAWiki
Definition
Embankment to retain the water during the construction of a dam which will later be included in the water or airside support body; A temporary watertight structure enclosing all or part of the construction area so that construction can proceed in the dry.
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Source
translated from "DIN 4048" by Alejandro and Hannah Carrizo; Glossary of Coastal & Hydraulics Laboratory (CHL), US Army Corps of Engineers (USACE), Vicksburg, USA