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Construction, operations and maintenance
==Construction, operations and maintenance==
[[Image:ContourRidgeDrawing.JPG|thumb|right|300px| Contour ridge in Kenya. Photo: SAI.]]
Ridges need only be as high as necessary to prevent overtopping by runoff. As the runoff is harvested only from a small strip between the ridges, a height of 15 -20 cm is sufficient. If bunds are spaced at more than 2 metres, the ridge height must be increased.
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