| Roufi
(Algeria), a wadi oasis that uses the protection of the walls of
the canyon and the wadi bed for the cultivations. The water supply
comes from the underground flow and the sporadic floods. |
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| Aerial
photograph of an oasis showing the structural elements: the artificial
dune; the path of the drainage tunnel in the depression of the dune
and the palm-grove extending according to a geometrical shape, following
the gravitational line of flow and division of the water and depending
on the quantity of water produced by the drainage tunnel. |
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