Firuzabad Plain Water Disposal Sistem in the Sasanid and Islamic Periods

Water transfer technology has played an essential role in forming and survival of urban centers in different periods. One of the features of this technology is the water disposal system, which has not been addressed as it should be. It seems that the Sassanids have worked hard in this regard and have shown to what extent, as an infrastructure, it has been decisive, effective, and important for other methods of water transfer. Questions were raised after field studies and literature review on water transfer methods in Firuzabad plain. 1- According to the geographical and environmental features of Firuzabad plain, what strategies were considered for the disposal of surface and groundwater during the Sassanid and Islamic Periods? 2- What effect has made the implementation of this coherent system on the formation and continuity of settlements and the economy of Firuzabad plain? The research approach is historical-descriptive-analytical and has been done using library and field studies. The field study covers the extent of Firuzabad plain with an area of 276 square kilometers. In this area, the water facilities, including river, spring, waterway, qanat, bridge dam, flood dam, and annual rainfall, were studied. These studies clarify that in the Sassanid period, the water disposal system was one of the most important and determining factors in the formation of infrastructure and urban development and other systems and technologies of water transfer in Firuzabad plain. The exact policies adopted have been maintained and exploited by the inhabitants of the plain until the present century. Also, the native names used in this regard are very important and significant. More importantly, it deals with the reasons for the formation of Ardeshir Khowarah in the eastern part of the river. Using archaeological and anthropological findings, this research identifies the water disposal methods of this plain and introduces the advantages of using them.