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__________ is the simplest form of cofferdam.

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__________ is the simplest form of cofferdam.

(a) Single wall cofferdam

(b) Earth-fill cofferdam

(c) Cellular cofferdam

(d) Rock-fill cofferdam

The question was posed to me by my school teacher while I was bunking the class.

This question is from Cofferdam and Caisson in chapter Deep Excavations, Pile Foundations and Caisson of Construction & Building Materials

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The correct choice is (b) Earth-fill cofferdam

Easy explanation: Earth dikes or Earth-fill cofferdams are limited to Shallow depth of water, say about 1200 mm to 1500 mm, with a low velocity of flow. It consists of an Earth bank which is placed around the site to be enclosed.

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