伊朗坎儿井：千年水利遗产的当代复兴
On the arid plateau of central Iran, the city of Yazd owes its very existence to a network of subterranean aqueducts known as qanats, some of which have flowed continuously for over two millennia. These gently sloping tunnels, hand-dug through rock and gravel, tap into underground aquifers and convey water by gravity alone to homes, gardens, and fields—a passive system that predates the Roman aqueducts and yet remains astonishingly relevant. But as the twentieth century recedes into the past, this ancient technology faces a quiet crisis, threatened by rapid urbanization, industrial groundwater pumping, and a dwindling cadre of the specialized muqannis, or qanat diggers, who possess the esoteric knowledge to maintain them.
The engineering is deceptively elegant: a mother well collects groundwater, and a gently inclined gallery—sometimes stretching for tens of kilometres—channels it via a series of vertical shafts that provide access and ventilation. Maintenance requires intimate familiarity with underground hydrology and a courage born of long tradition; muqannis descend into narrow, often suffocating tunnels to clear silt and repair collapses, wielding only hand tools and a headlamp. Yet this centuries-old body of expertise is not easily transmitted in a world of drilling rigs and motorized pumps, and the number of active muqannis in Iran has fallen to a few hundred, most of them elderly.
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