The temporary all round enclosure which keeps the water away from the working area by using
vertical barriers is called-
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A.
Arch dam
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B.
Gravity dam
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C.
Coffer dam
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D.
Earthen dam
Correct Answer:
C. Coffer dam
Explanation:
A coffer dam is a temporary, watertight structure built to enclose a specific area, allowing water to be pumped out to create a dry working environment for construction activities like bridge pier installation or dam repair. Unlike permanent structures such as arch, gravity, or earthen dams, a coffer dam is removed once the submerged work is completed. This vertical barrier effectively isolates the site from the surrounding body of water to ensure safety and stability during the building process.
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