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Hand auger - driven wells

63 bytes removed, 05:08, 27 April 2012

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[[Image:Treadle_pump_icon.png|right]]

[[Image:Driven point and hammering tool.jpg|thumb|right|~~150px~~300px| Driven point and hammering tool]]

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==Suitable conditions ==

The driven well can only achieve a penetration of only 1-2 meters into the water table because of the compacting resistance of the sand. The depth can be increased to about 10 meters using an engine driven power tool. However, the type of formation (of the aquifer, permeable or not permeable) can not be determined at this depth because no soil samples can be taken. This may affect the well yield. It is not possible to install a gravel pack around the well screen.

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==~~==Operation==~~Construction, operations and maintenance==

Driven wells are sometimes used in combination with augers in collapsing sand layers. If augers cannot penetrate further into a collapsing sand layer, and a temporary casing cannot be used (for example, the casing is stuck in a clay layer, see description above), a well point and well screen can be driven into the ground using a hammering tool or normal hammer.

~~====Maintenance====~~Well points and well screens can be self or factory made.

~~====Manufacturing ====~~

~~Well points and well screens can be self or factory made.~~

==~~Cost~~Costs==

==~~Country~~ Field experiences==

Driven wells are mainly used in Chad, Cameroon and Madagascar

==~~Manuals~~Reference manuals, videos, and links==

* Self-help wells, R.G. Koegel, FAO 1985. Internet manual on hydrogeology, well constructions, all drilling techniques - [http://www.fao.org/docrep/X5567E/x5567e05.htm#4.2%20driven%20wells website].

~~==Movies==~~

~~== Acknowledgements==~~

* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].

~~==External Links==~~

* Water for the World, Technical note series rws 2, USAID 1982 - Technical notes on methods of developing of groundwater, manual drilling techniques. [http://www.lifewater.org/resources/ground_water.html Website Livewater International].

* Rural Water Supply Network - Useful network and website for information and downloads related to Rural Water Technologies - [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822/prarticle.2009-05-11.3051371225/prarticle.2009-06-24.1497321145/view?searchterm=driven%20wells short information on driven wells]

==~~References~~Acknowledgements==* The basis for the material on this page was obtained from a desk study shortly to be published on the website of the [http://www.practicafoundation.nl/ Practica Foundation], and from the [http://www.rwsn.ch/ Rural Water Supply Network], and specifically its [http://www.rwsn.ch/prarticle.2005-10-25.9856177177/prarticle.2005-10-26.7220595116/prarticle.2005-11-15.6127855822 manual drilling section].

Winona

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