Slide 1
A qanat carries groundwater through an underground tunnel
A qanat is a water system with an underground tunnel linked to the surface by access shafts. It carries groundwater along that hidden route.
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A row of openings across dry ground can mark a water system largely concealed below. In a qanat, shafts connect the surface to an underground tunnel. The visible pattern is evidence of infrastructure whose working route lies out of sight.
Slide 2
The outlet sits lower than the water source
The tunnel intercepts groundwater and directs it toward an outlet at a lower elevation. Gravity drives the flow.
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The tunnel intercepts groundwater and carries it toward an outlet at lower elevation. Gravity drives the flow along its grade. A sectional drawing reveals the essential relationship between the water-bearing ground, the tunnel and the land surface.
Slide 3
The tunnel must keep a usable downhill route
To maintain that flow, the tunnel needs a usable downhill route beneath terrain that may be uneven. Its slope is a central part of the design.
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The tunnel must preserve a usable downhill route while passing beneath uneven terrain. Its alignment is therefore a central engineering choice, not simply a hole pointing toward a settlement. Gravity supplies the movement of water; people supply the work of creating the route.
Slide 4
People must maintain the route and share the water
Qanat shafts provide access for construction and maintenance. Communities also organize water allocation; the channel alone cannot decide who receives it.
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Shafts provide access associated with construction and maintenance, while communities organize use and distribution of the water. These arrangements belong to the system's operation. A sound physical channel alone cannot determine who receives water or how the infrastructure is sustained.
Slide 5
Gravity cannot replace groundwater or maintenance
A qanat depends on both its groundwater source and a functioning tunnel. Keeping the water moving therefore depends on the resource, the route and continuing care.
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A qanat can convey water only while its groundwater source and physical route support that flow. It is not immune to aquifer depletion or maintenance needs. The infrastructure joins a geological resource, a carefully graded passage and continuing human management.
Sources
- The Persian Qanat
UNESCO World Heritage Centre