S L D TUBE WELL

එස්.එල්.ඩී නළ ලිං

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JA -ELA , WELIGAMPITIYA

Sand/gravel packing

The drawing shows graded sand and gravel, which is placed from the top of the borehole. More compact, pre-bonded, packs of sand and/or gravel are available commercially; some of these can also form part of the pump inlet assembly. Sand and/or gravel packing is meant to eliminate particles from the water before they reach the screen and that would otherwise have passed through

Ground Water Safety

The introduction of tube wells has led to major arsenic poisoning in Bangladesh.^[1] High concentrations of arsenic occur naturally in the soil in some areas of Bangladesh.

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