coffer dam
It can mean something like a 'coffer dam' which is a structure built around a construction site in a river or sea to permit work within it after water is pumped out.
Charles Evan Fowler has written: 'Ordinary foundations, including the coffer-dam process for piers, with numerous practical examples from actual work' 'The coffer-dam process for piers' -- subject(s): Coffer-dams, Piers 'The Coffer-dam Process for Piers: Practical Examples from Actual Work'
Bridges and dams are built after a coffer dam is constructed to reroute the water. When the structure is complete the coffer dams are removed or destroyed.
Markala Dam Kainji Dam Kandadji Dam (currently under construction)
Teheri dam ;encyclopedia,Wikipedia
Some of the innovations that made the construction of the Hoover Dam possible is.....................................................................................................................................................................................................................................................................................................................................................................................................................GO AND DO YOUR MOM!
Construction of the dam started in 1926.
Construction of a major dam on the Colorado River.
The construction of the Colebrook River Dam began in May 1965. Construction on the dam was finished in June 1969. It cost a total of $14.3 million dollars to complete.
The construction of the Pati Dam started in 1991. It is located in Rajasthan, India, and serves various purposes such as irrigation, water supply, and hydroelectric power generation.
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Lake Mead is formed by the dam; until the dam was finished, there was no Lake Mead to hold back. The river was diverted during the construction.