Evolution of the Qanāt (Kahriz) Systems in the Arid Countries of the Caucasus and Central Asia

Some natural problems occur under arid climatic condition in the world. One of the most important problems is limitation of the water resources. Hence, some sources and methods are available to use water under this climatic condition. There is an urgent need for subsoil water resources utilization in these zones. The qanāt (kahriz) wells are used by consuming the subsoil waters in this direction.