Question

A _______ is defined as a temporary structure which is constructed so as to remove water and/or soil from an area and make it possible to carry on the construction work under reasonably dry conditions.

(a) Cofferdam

(b) Foundation

(c) Caisson

(d) Spillway

The question was posed to me in homework.

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

Answer 1

Correct answer is (a) Cofferdam

To explain I would say: The cofferdam is generally constructed at the site of work. The cofferdam should be reasonably watertight. It may either raised on the impervious soil or may be extended to impervious strata through pervious soils. It should be noted that absolute water tightness is not desired in a cofferdam.