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Cofferdam :-

A cofferdam is a structure that retains water and soil that allows the enclosed area to be pumped out and excavated dry. Cofferdams are typically dismantled after permanent works are completed.

 Use of Cofferdam :-

Cofferdams are commonly used for construction of bridge piers and other support structures built within water.

Types Of Cofferdams :-

Considering the material used in their construction, cofferdams may be divided into the following categories.

(a) Earthen cofferdam
(b) Rock-fill cofferdam
(c) Single-walled cofferdam
(d) Double-walled cofferdam
(e) Crib cofferdam
(f) Cellular cofferdam (Circular or diaphragm type)

For more detail information about above types of Cofferdam :- 

Reference :-