Question

Which of the following tubewell is suitable when a deep bearing stratum lies below an impervious layer and water contribution can take place through bottom only?

(a) Strainer type tubewell

(b) Abyssinian tubewell

(c) Cavity type tubewell

(d) Slotted type tubewell

This question was addressed to me at a job interview.

My question is based upon Tube Well-1 topic in section Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

Answer 1

Right choice is (c) Cavity type tubewell

The best explanation: 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. The slotted type tubewell is intermediate to the strainer and cavity type tubewell and is used where both the above cannot be used.