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Algerian
Sahara. The barrows and the stone arrangements disseminated
all over the Sahara refer to a prehistoric civilisation based
on the capability of catching the quantity of water contained
in the atmosphere which in the presence of colder stone masses
condenses and is retained in the soil.
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Saharan
mausoleum used as a collector of moisture and water run-off along
the slope. The rows of stone convey the flows towards the area
protected by the barrow.
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Prehistoric
water condenser: a) plan, b) cross section. The device works both
during the day and during the night. During the day, the wind
seeps into the stones where it finds the internal temperature
lower than the outside temperature and the moisture of the wind
condenses. During the night the condensation process occurs outside
on the surface of the cooler stones.
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Mounds of stones in the shape of a crescent, circles and rows of stones, found during archaeological excavations in the Hedomite and Nabatean hydroagriculture, common in all arid and Mediterranean areas for plant preservation.
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