Which outcome arises when a qanat collapses during the dry season?

💡 Explanation

Collapse obstructs the flow via conduit blocking, thus depriving downstream users of irrigation water, because qanats used gravity to transport water from aquifers. Therefore, crop failure results from water deprivation downstream of the failure, rather than alternative local aquifer impacts.

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• Which structural problem plagued early cast iron bridges subjected to repeated heavy loads?
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