Cofferdam
A cofferdam is a temporary, watertight enclosure built within, or across, a body of water to allow construction, repair, or inspection work in a dry area. By isolating a section of the watercourse or shore and removing the water from inside the enclosure, workers can access the worksite as if it were dry.
Construction methods vary with site conditions. The most common form is a sheet pile cofferdam, created by
Dewatering and operation involve pumping water from inside the enclosure to achieve a dry working area. Dewatering
Applications include bridge piers and abutments, dam and lock works, port and marina construction, underwater foundation
Limitations and safety considerations encompass cost, time, and the need for careful engineering to resist seepage