cofferdam(redirected from box dam)
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1. A temporary watertight enclosure that is pumped dry to expose the bottom of a body of water so that construction, as of piers, can occur.
2. See caisson.
nOften shortened to: coffer
1. (Civil Engineering) a watertight structure, usually of sheet piling, that encloses an area under water, pumped dry to enable construction work to be carried out. Below a certain depth a caisson is required
2. (Nautical Terms) (on a ship) a compartment separating two bulkheads or floors, as for insulation or to serve as a barrier against the escape of gas or oil
cof•fer•dam(ˈkɔ fərˌdæm, ˈkɒf ər-)
1. a temporary watertight enclosure for construction or repairs in waterlogged soil or under water.
2. a sealed void between two bulkheads that prevents the escape of liquids, heat, etc.