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The
dam of Beni Isguen, one of the settlements of the pentapolis of
Ghardaia. The dam is not used to create a water basin but rather
it retains the flows in the subsoil and water is drawn up from
the wells like that above on the right.
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The
dam of Beni Isguen in one of its sporadic moments of flood that
even occur every ten years, when the water intakes channel the
flows towards the single parts of the palm-grove and replenish
the water table.
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Terraced
glacises of the Apulian Murgia highlands on the Adriatic side
organised by means of dry stone walls.
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Portugal.
The terracing system shapes the landscape on a large scale. Without
this system the slopes and hills would undergo erosion due to
the alternating drought and violent rainfalls and would not allow
cultivation.
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Gorzegno
(Langhe). Stone terracing systems.
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China.
dry stone lunettes for the creation of soil and the protection
of the slopes.
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Tassili
n'Ajjer (Algeria), scenes of Saharan Neolithic breeding. The attitude,
the coat and the swollen udders of the animal suggest domestication.
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Gabarband of Pir Munaghara (Belucistan). Dating back to before the Harappa civilization, the device consisted of a series of 60-120 cm-high terraced platforms made out of pebbles which decreased in height as they went upwards. This device was used to keep the floods under control and stop the alluvial sediments coming down the hill.
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Combined system of sand accumulation dams and underground dams. The first (b) are generally built by overlapping different levels. The underlying principle is to limit the height of each level so that lighter material is transported by water out of the basin, whereas heavier material accumulates.
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