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QANAT IN IRAN

A qanat or kariz, is a system for transporting water from an aquifer or water well to the surface, through an underground aqueduct. Constructed in Iran, Iraq and numerous other societies, this is an ancient system of water supply which allows water to be transported over long distances in hot dry climates without loss of much of the water to evaporation. The system has the advantage of being resistant to natural disasters such as earthquakes and floods, and to deliberate destruction in war. Furthermore, it is almost insensitive to the levels of precipitation, delivering a flow with only gradual variations from wet to dry years.