Study of old Larestan water systems (aquifer) based on written sources and available evidence (from the 5th century AH to the end of the Qajar period)

Larestan (Irahestan) covers a wide area of the the hinterland and coastalland of the Persian Gulf. These regions had semi-independent rulers from the first centuries of Islam until 1010 AH, who were referred to as the Gorgin Milad and Miladian dynasties. Larestan is important due to its geographical location in terms of trade routes that connected the Persian Gulf ports to more northern regions such as Shiraz it is climatically located in the hot and dry region of the southern post-coastal region. Water scarcity is one of the main climatic features of these areas. In this paper, the study of Larestan water systems based on written sources and available evidence from the 5th lunar century to the end of the Qajar period, with the main question of the principles of water systems and changes in water systems in different periods, with the aim of showing how Larestan people adapt to periods. Various were studied. This research has been provided by studying written historical documents and information in geographers' reports by historical research method and based on collection and summarization, along with the available evidence. To cover the weakness of studies in this field. The study of written sources shows that water resources in Larestan have been in the form of well, cattle wells, springs,Cistern and aqueducts. The use of groundwater aquifers, as in most different parts of Iran, has been one of the systems used in these areas, but the predominant system of surface water storage in reservoirs has been because of groundwater aquifers that are not the same in all large areas of Larestan, even in Areas that are rich in aquifers can be depleted by the salinity of water, which is often the case in the plains. In addition, the strengthening of aquifers has been considered, also the water systems in Larestan region has a kind of cultural stagnation in terms of function and shape.