== Applying conditions ==
<ul>
Mainly applied for irrigation purposes
</ul>
== 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.)