For this purpose, a special plough was designed to form the ridges, usually in straight lines (though approximately on the contour), at a distance of 2 metres apart. The machine is reversible, and the sub-soil beneath the furrows is ripped to increase infiltration rates. Cross ties are formed by the machine at an automatically controlled spacing. It is reported that one hectare can be treated in an hour, and up to 1,000 ha in a four month season by a single machine. The involvement of the villagers and implications for land tenure however need to be carefully taken into account as the programme develops.
====Akvo RSR Projects====
The following project(s) utilize contour ridges.
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{|style="border: 2px solid #e0e0e0; width: 60%; text-align: justify; background-color: #e9f5fd;" cellpadding="2"
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|[[Image:akvorsr logo_lite.png|center|60px|link=http://akvo.org/products/rsr/]]
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|[[Image:project 674.png|thumb|center|140px|<font size="2"><center>[http://rsr.akvo.org/project/674/ RSR Project 674]<br>Wateroogst: <br> Konso Woreda/Eshimale</center></font>|link=http://rsr.akvo.org/project/674/ ]]
|}
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===Manuals, videos and links===
