Karez

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Karez

 

(Persian; literally, an underground irrigation channel), an underground structure for collecting groundwater and conveying it to the surface. Such structures are in use in the mountainous and foothill areas of Middle Asia and Transcaucasia. Water from a karez is used for water supply and irrigation.

A karez consists of one or more water-catchment tunnels 1.0–1.4 m high and 0.5–0.6 m wide, with reinforced walls laid through a water-bearing horizon, as well as vertical ventilation wells and a water tunnel connected to a discharge channel. Karez tunnels can be as much as several kilometers long. The average yield of a water-catchment tunnel is 0.3–0.6 liters per sec per meter of the tunnel.

References in periodicals archive ?
Summary: TEHRAN (FNA)- A short documentary film of an Iranian director about millennial underground water systems of Iran, qanats, is slated to be screened at international film festivals in Spain and Romania.
Qanat is the generic term for an ancient environmentally sustainable water harvesting and conveyance technique believed to have originated in Persia in the early first millennium BCE.
The Department of Transport Inaugurates Al Qanat Street near to Al Raha Boulevard Street with 12 Signalized Intersection.
"It turns out that there are similarities between Balinese Subak traditions and the Qanat tangible cultural heritage of Iran, even though the countries are 80,000 kilometers apart," he explained.
Antica Pesa offers guests beautiful views of Qanat Quartier and the Arabian Gulf, with inside or outside dining on the terraces.
Written by Badawi Habak Translated by Rasha Zantout NNA - The road that leads to the church and grotto of Saint Shallita takes you through the village of Qanat to the farm of Bani Saab, then the valley of Saint Shallita in Bcharre district.
"This is part of our philosophy to continually reinvent and upgrade The Pearl-Qatar," and added that a sporting facility, located in Qanat Quartier, spanning an area of over 2,000m[sup.2], along with more convenience stores and services, are planned for the precinct.
Ghulam Farooq Barakzai, the Review Board member Abdul Shakoor Dadras, Abdul Karim Qanat and Defence Ministry official Anwar Shah.
Radars will be set to 121 km/h in both directions from Al Qanat Bridge (the Channel Bridge) to Sheikh Zayed Bridge, to catch speed violators.
During winter these channels flooded with water, derived from the qanat irrigation system, through runoffs from mountains areas.