Qanats in Iran

About 2500 years ago Persians invented a number of methods for harnessing groundwater including a water management system called a qanat. They supply about 7.6 billion m3 or 15% of the country’s total water needs and play a major role in advanced water harvesting. Still used today qanats are built as a series of underground tunnels and wells that bring groundwater to the surface. The qan?t is a water structure used since ancient times that allows access to water year-round. At first an underground aquifer is located as the water source to which a shaft is dug down. After establishing this connection an underground tunnel is excavated with regular vertical shafts to the surface for air circulation. These shafts allow for the identification of a qan?t through remote sensing as they appear in lines on the surface. The tunnel conveys the water from the aquifer source towards the mazhar an outflow facility from which canals divert it further to wherever is necessary. Qan?t water is often a necessity for allowing agriculture in semi-arid and arid areas but is also used to supplement existing water networks. Primarily water is used for agriculture but it can also provide as.