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Identify the Method used for the dewatering of the foundation trenches. (a)Pumping

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Identify the Method used for the dewatering of the foundation trenches.

(a) Pumping

(b) Providing sumps and side drains

(c) Well Point System

(d) Cement grouting

I got this question in unit test.

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

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Right answer is (b) Providing sumps and side drains

For explanation I would say: In providing sumps and side drains, the side drains are constructed along the bottom of the foundation Trenches. The sumps are constructed at a distance of 45 M to 60 M and the side drains are given such as slope that water is collected in the sumps.

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