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Most rivers in Iran are seasonal and have traditionally not been able to supply the needs of urban settlements. Major rivers like the Arvand, Aras, Zayandeh, Sefid and Atrak were few and far between in Persia.
With the growth of urban settlements during the ages, locally dug deep wells could no longer keep up with the demand, leading to the systematic digging of a specialized network of canals known as Qanat.
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