Akvopedia-spade, administrator
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Mainly applied for irrigation purposes.
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== External links ==
* [http://www.practicafoundation.nl www.practicafoundation.nl Practica Foundation]
* [http://www.teriin.org www.teriin.org TERI] (In 2002, TERI published a book on the subject, entitled Technology innovation and promotion in practice: pumps, channels and wells.)