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Qanat: An Ancient Water Supply System

The qanat is an ancient Persian (nāt) or Arabic (qanaa) term referring to a sophisticated system of underground aqueducts used for transporting usable water from an aquifer or well to the surface. This innovative technology was developed in ancient Iran around 1000 BCE and gradually spread westward and eastward, influencing various civilizations.

The qanat's primary purpose is to provide year-round access to water for agricultural areas and settlements, particularly in regions where natural water sources dry up during hot seasons. By harnessing groundwater, these systems are ecological and energy-efficient, with minimal losses of water due to the use of gravity alone to deliver water to the site.

The qanat's construction typically involves a series of well-like vertical shafts connected by gently sloping tunnels that carry a water canal. These structures were often built along valleys where Quaternary sediments are deposited, allowing for optimal water flow and storage. The qanats' unique design enables them to supply areas tens of kilometers away from natural water sources.

The term "qanat" is derived from the Arabic word "āh," meaning 'spear' or 'channel.' Other names for this system include kahan (Persian), Galerías, minas o viajes de agua (Spanish), Daoudi-type falaj (Arabic) in Oman and the United Arab Emirates, Foggara/fughara (North Africa), and various regional titles such as caries or carreuses in Afghanistan, Pakistan, India, and Central Asia.

The qanat's origins are attributed to ancient Iranian civilization, with similar analog systems developed independently in China and South America. The use of cotton species like Gossypium arboreum for irrigation purposes is mentioned in ancient texts such as Theophrastus' Inquiry into Plants and the Laws of Manu.

Today, qanats continue to be used in regions with hot desert climates where water resources are scarce. These ancient facilities have adapted to modern needs, providing a sustainable solution for water supply and agricultural development. Their preservation and functionality can be found in Central Asia, North Africa, and the Gulf region, serving as a testament to the ingenuity of ancient civilizations.

Ghanaate: An Ancient Artificial Underground Irrigation Facility

The ghanaate is an ancient artificial underground irrigation facility that provides year-round access to water for agricultural areas and settlements. Originating from