Minimum depth for the lining of a sanitary well is: (A) 5 meters, (B) 6 meters, (C) 7 meters, (D) 8 meters
Answer is B. The lining of a sanitary well should go down at least 6 meters (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 60-90cm (2-3 feet) above the ground.Park 23rd edition pg: 709