Perforated casing well

A perforated casing well, or slotted tubewell, is a tubular well immersed in the ground into which water filters through the slots in the tube walls or its bottom. The most common diameter of the tube is 40 cm, and its length varies from a few metres to 50 metres. A perforated casing well is suitable for the water supply of communities in sand and gravel areas.