Question

A advantage of using jetting of water in well point system is ___________

(a) Forms a natural filter around well point

(b) Allows to penetrate soil easily

(c) Less time is consumed for drilling

(d) All of the mentioned

This question was addressed to me during an interview for a job.

I'd like to ask this question from Well Point System in chapter Drainage and Dewatering of Geotechnical Engineering I

Answer 1

Right answer is (a) Forms a natural filter around well point

The best I can explain: A advantage of using jetting is that the water under pressure washes away soil fines from around the well point leaving a relatively coarser material to settle to form a natural filter around the well point.