عنوان مقاله [English]
نویسندگان [English]چکیده [English]
This paper, for the first time, introduces the subterranean dams built on some qanats, whose subterranean canals pass through rocky areas. This technology , developed centuries ago in Iran, allowed preservation of the not-so-needed water of qanats during the winter season and its planned use during the spring and summer seasons, when water is so much needed and the outputs of qanats are low. The qanat of Vezvan, in Meimeh of Esfahan , is one of such qanats which is still in use. Due to the rockiness of the passage of the underground canal of this qanat, a dam is constructed on it 16 meeters under the ground . The paper discusses this Iranian invention and describes , in detail , the subterranean dam of Vezvan.