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Which type of open well is suitable when the sub-soil is formed of gravel or coarse sand deposits?

Which type of open well is suitable when the sub-soil is formed of gravel or coarse sand deposits? Correct Answer Wells with pervious lining

Permanent lining or wells with impervious lining is sunk in regions with alluvial soil formation. Unlined wells or temporary wells are of very shallow depths and can be constructed only when the water table is very near to the ground. Wells with pervious lining is generally suitable in the strata of gravel or coarse sand.

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