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Your current IP address is 8.222.208.146. </p> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>Even while globally blocked, you will <i>usually</i> still be able to edit pages on <a href="https://meta.wikimedia.org/wiki/" class="extiw" title="m:">Meta-Wiki</a>. </p> </div> <div class="paragraphbreak" style="margin-top:0.5em"></div><div style="font-size: 16px;"> <p>If you believe you were blocked by mistake, you can find additional information and instructions in the <a href="https://meta.wikimedia.org/wiki/Special:MyLanguage/No_open_proxies" class="extiw" title="m:Special:MyLanguage/No open proxies">No open proxies</a> global policy. Otherwise, to discuss the block please <a href="https://meta.wikimedia.org/wiki/Steward_requests/Global" class="extiw" title="m:Steward requests/Global">post a request for review on Meta-Wiki</a>. 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The lower end is fitted with a strainer, and a pump lifts water for [[irrigation]]. The required depth of the well depends on the depth of the [[water table]]. ==History== The tube well was invented and patented by British [[Hydrology|hydrologist]] John Norton in the 1860s. Versions of his tubewells were used during the [[British expedition to Abyssinia]] in 1868 to provide ground water for the advancing force. It proved so successful for the British that they became known as "Abyssinian wells" and were widely adopted in England and elsewhere for providing reliable water supplies <ref>{{cite journal |last1=Mather |first1=John D. |last2=Rose |first2=Edward P.F. |title=Military aspects of hydrogeology: An introduction and overview |journal=Geological Society, London, Special Publications |date=2012 |volume=362 |issue= 1 |page=1-18 |doi=10.1144/SP362.1|bibcode=2012GSLSP.362....1M }}</ref> ==Components== [[Image:rizwan tubewell.jpeg|thumb|300px|Diagram of a tube well.]] ===Temporary reservoir=== A small reservoir of water is made at the outlet of the tube well. This reservoir is used for different usage of water by the local population. ===Casing=== [[File:Borewell digging.ogv|thumb|Digging a borewell in Kerala, India]] The tube well casing houses the inlet, cylinder, piston valves and rising main of a "down-the-hole" type hand pump. Casing to support the external surfaces of the borehole against collapse may be needed, either temporarily or permanently, and is often made of [[PVC pipe]], which has the advantages of being both cheap and inert. Seepage down the tube well bore is prevented by the sanitary seal. Seepage from the ground above the aquifer is excluded by the lengths of plain casing. Water to be pumped is admitted through slots in the lower lengths of casing. Water abstracted from aquifers in relatively soft ground usually contains sand or silt particles, which are liable to cause rapid wear to pump valves and cylinders (and dissatisfaction among consumers). Methods of preventing these particles from reaching the pump are of two general types, screening and sand/gravel packing. ==== Screening ==== In the simplest devices, slits are simply cut in the casing. More elaborate compact screens are available commercially; some can be bolted on to pump inlets. Materials used include woven wire and man-made fabric; the latter can be wrapped around the pump inlet assembly. ==== Sand/gravel packing ==== Graded sand and gravel may be placed from{{clarify|date=September 2020}} 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 which they would otherwise have passed through. == Ground water safety == [[File:Tube well drinking water bottle Sri Lanka.jpg|thumb|Tube wells are a common source of bottled drinking water in some countries, such as Sri Lanka]] The introduction of tube wells has led to major [[arsenic poisoning]] in Bangladesh.<ref>{{Cite magazine|last=Walsh|first=Bryan|date=2010-06-19|title=Study Says Arsenic Poisons Millions in Bangladesh—But They're Not the Only Ones|language=en-US|magazine=Time|url=https://science.time.com/2010/06/19/study-says-arsenic-poisons-millions-in-bangladesh%E2%80%94but-theyre-not-the-only-ones/|access-date=2021-10-08|issn=0040-781X}}</ref> High concentrations of arsenic occur naturally in the soil in some areas of Bangladesh. ==Advantages of tube well irrigation == * Makes groundwater available when the [[water table]] is fairly close to the surface. * Able to irrigate a large area. * More reliable than surface water during periods of drought. * Suitable for [[small holding]]s. ==See also== * [[Johad#Similar|Water conservation structures]] ==References== {{reflist}} {{DEFAULTSORT:Tube Well}} [[Category:Water wells]] </textarea><div class="templatesUsed"><div class="mw-templatesUsedExplanation"><p><span id="templatesused">Pages transcluded onto the current version of this page<span class="posteditwindowhelplinks"> (<a href="/wiki/Help:Transclusion" title="Help:Transclusion">help</a>)</span>:</span> </p></div><ul> <li><a href="/wiki/Template:Ambox" title="Template:Ambox">Template:Ambox</a> (<a href="/w/index.php?title=Template:Ambox&action=edit" title="Template:Ambox">view source</a>) (template editor protected)</li><li><a href="/wiki/Template:Category_handler" title="Template:Category handler">Template:Category handler</a> (<a href="/w/index.php?title=Template:Category_handler&action=edit" title="Template:Category handler">view source</a>) 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