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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?

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? Correct Answer Cavity type tubewell

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.

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