Ghanats of Iran: Drainage of Sloping Aquifer

by Mohammed Bybordi, Sr. Expert; Tech. Bureau, Plan and Budget Organization, Tehran, Iran,


Serial Information: Journal of the Irrigation and Drainage Division, 1974, Vol. 100, Issue 3, Pg. 245-253


Document Type: Journal Paper

Abstract: Ghanats represent one of the oldest systems of water supply in the world. A Ghanat is merely a kind of subsurface drain whereby ground water is brought to the surface by means of a man-made gravity flow channel. The drains of the Ghanats are usually laid in the direction of maximum slope. The number of Ghanats in Iran is estimated to amount to 50,000, and provides from one-third to one-half of all the irrigation water in the country. Methods of construction have been described and a theory advanced to account for the interrelationships of some of the parameters that control the discharge of a Ghanat.

Subject Headings: Drainage | Aquifers | Developing countries | Slopes | Construction methods | Channel flow | Water supply systems | Subsurface drainage | Groundwater flow | Overland flow | Iran | Middle East

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