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 ?
This auction provides investors and buyers with the opportunity to get terrific bargains on luxurious townhouses located in the Venice-like community of Qanat Quartier, all of which enjoying scenic sea view as well as direct access to the beach.
For instance priority was given to the drilling of new wells equipped with motorized pumps, which resulted in the destruction of the cheaper and more effective traditional irrigation systems called the qanats, (19) and new dams were sited inappropriately and constructed poorly.
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.
Radars will be set at 121 kmph in both directions from Al Qanat Bridge (the Channel Bridge) to Shaikh Zayed Bridge to discourage violators.
Abdullah, a resident of Qanat Al Qasba, said: "I am so glad that Sharjah has implemented this ban.
99 per cent during UDC's open house promotion at the Venetian-inspired Qanat Quartier, from 6-8 November 2013 at the Pearl Qatar.
The Qanat building (in the Eastern agricultural chain) now produces a small amount of food in campaign mode.
The funds will be channeled to the purchase of the remaining residential units at Qanat Quartier project, being developed by the UDC on the Pearl-Qatar artificial island here, according to press release by the bank.
In a seminar in Kirkuk, in cooperation with UNAMI, attended by Aswat al-Iraq, he reminded of Qanat explosion in 2003 where UN representative Sergio Di Milo was killed.
The project to renovate the qanat was commissioned by Custodian of the Two Holy Mosques King Abdullah.
Similar systems are present in neighboring Arabian countries and in Persia where it is considered by literature the origin of falaj or Qanat irrigation system.
Breezair systems have been installed at UAE sites including Al Wasl vehicle testing centres, kitchens of the Hospitality and Catering Company in Ruwais, the outdoor dining area of Fenyala Restaurant at Qanat Al Qasba, Lucy switchgear manufacturing plant, RAK Ceramic's kiln area, Sharjah Heritage, the Sky Diving Institute on Al Ain Road and Streit Vehicle Factory in Ras Al Khaimah (secondary cooling).