Minimum depth for the lining of a sanitary well is?
The lining of a sanitary well should go down at least 20 feet to ensure that water enters from the bottom and not from the sides of the well. The lining should extend upwards for about 2-3 feet above the ground. Ref: Park's Textbook of Preventive and Social Medicine, 20th edition, p620
10 feet
20 feet
35 feet
50 feet
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