Question

Which of the following strainer is used for shallow irrigation tube wells particularly in deltaic regions of developing countries?

(a) Continuous slot type of strainer

(b) Louver type of strainer

(c) Pipe strainer with fine mesh jackets

(d) Coir rope strainers

The question was asked in an internship interview.

This intriguing question originated from Tube Well-2 in section Ground Water for Irrigation through Wells and Tubewells of Irrigation Engineering

Answer 1

The correct answer is (d) Coir rope strainers

Explanation: Coir rope strainers are low-cost strainers and are generally used for shallow irrigation tube wells. The main disadvantage of such a strainer is its short life of 3 to 5 years. The rusting of the iron bars of the supporting frame and the loosening of the coir rope which expands on wetting are the causes of its failure.