Question

For successful dewatering in fine, non-cohesive soils, _________ method is used.

(a) ditches and sumps

(b) electro-osmosis method

(c) well point system

(d) vacuum method

I got this question in an internship interview.

The query is from Drainage and Dewatering in section Drainage and Dewatering of Geotechnical Engineering I

Answer 1

The correct answer is (d) vacuum method

The best I can explain: For fine grained soils that are non-cohesive like silty sand, the well point system can be extended by vacuum method. The electro-osmosis method is used for dewatering of fine cohesive soils.