A Cofferdam is one sort of temporary creation shape that is built within the river, lake, etc. to cast off water from an area and make it possible to hold on to the construction work beneath reasonably dry situations. one-of-a-kind styles of Cofferdams are generally required for tasks consisting of denis, docks, and creation of bridge piers and abutments.

Cofferdam must be moderately watertight. It has to be commonly built on the website of labor. The layout and layout of a cofferdam must be such that the whole fee of creation, protection, and pumping is minimum.