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    During Desertification of Bronze Age Collapse Gravity Flow Water Canal Systems Became Necessary

    Irrigation and drinking water tapped from water tables in highlands flowed down canals to valleys and plains below were begun when the water became necessary, after centuries of sufficient rainfall, the canals known as qanat (Iran), foggara (North Africa), or karez (Sinkiang) begun circa 1200 b. c. when the Ice Age had recently ended.

     

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