Examples from the Web for cofferdam
Referring to the cost of cofferdam work, we see that, in order to excavate the 58 cu.
The lower part of C bulkhead was doubled and was in the form of a cofferdam.Loss of the Steamship 'Titanic'|British Government
The whole was built in a cofferdam, quite dry, and the opening was a holiday.
And the night shift began to repair the cofferdam for old Jezebel had dropped suddenly back into her old trail.Still Jim|Honor Willsie Morrow
A hand pump served to keep the cofferdam dry enough for excavating; but in more open material a power pump is usually required.