A cofferdam is a temporary enclosure built within a body of water to create a dry work area for construction or repair projects, such as building bridges, dams, or piers. It is typically made from sheet piles, concrete, or earth, forming a barrier that prevents water from entering the work site. Once the enclosure is in place, water inside the cofferdam is pumped out, allowing construction to proceed in a dry environment. Cofferdams are crucial for enabling underwater construction without the challenges of working in water, ensuring safety and structural integrity. After the project is completed, the cofferdam is typically dismantled. This method is cost-effective and widely used in marine and river-based construction.

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