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COFFERDAM

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Originally appearing in Volume V06, Page 649 of the 1911 Encyclopedia Britannica.
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COFFERDAM , in See also:

engineering. To enable See also:foundations (q.v.) to be laid in a site which is under See also:water, the engineer sometimes surrounds it with an See also:embankment or See also:dam, known as a cofferdam, to See also:form an enclosure from which the water is excluded. Where the See also:depth of water is small and the current slight, See also:simple See also:clay dams may be used, but in See also:general cofferdams consist of two rows of piles, the space between which is packed with clay puddle. The dam must be sufficiently strong to withstand the exterior pressure to which it is exposed when the enclosed space is pumped dry.

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