Question

The most widely used type of a deep state tube well in India is __________

(a) cavity well

(b) strainer tube well

(c) slotted pipe gravel packed tube well

(d) both cavity and strainer tube well

This question was posed to me in an interview for internship.

This intriguing question originated from Tube Well-1 in section Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

Answer 1

Right option is (b) strainer tube well

The explanation is: Strainer type tubewell is a bored hole in which a metal pipe with suitable perforations is inserted. A strainer type tubewell is suitable when water-bearing stratum is available at less depth and there is a possibility of tapping water through sides. It is generally unsuitable for fine sandy strata.