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10 cards from this deck
Southern Algeria, Northern Sahara Desert
Average 50mm per year
Underground tunnels transporting water with minimal evaporation
Approx. 2.5 km upstream
1-2 mm/m downward incline
Comb-like stone device dividing water fairly
Almost 2% per year
Desert areas where groundwater enables vegetation & settlement
Every 20-30 metres
2017-2018
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