Qanat is an ancient Iranian groundwater supply system which has diffused to numerous areas outside of Iran as well. In addition to its eco-friendly techno-physical structure, the Qanat system includes many socio-institutional and ritual dimensions such as Boneh and Qanat marriage rites. The present research reviews the current literature on the Qanat system to investigate the impacts of technical, socio-institutional, and intellectual/ritual aspects of the Qanat system on water resources. This traditional system has been replaced with inefficient technologies and rural institutions through a countrywide change during the 1960s. By including the process of water management modernisation in Iran, a comparative assessment of Qanat and its modern alternatives will become part of this study too. In this way, my research can indicate while the integrated sociocultural and technological system of Qanat sustainably provided water for millennia, contemporary water management systems have been demonstrated to be unsustainable. I draw on a conceptual framework which derives from ecological anthropology and Traditional Ecological Knowledge studies (referred to as "TEK studies" in this research). These approaches provide the most applicable conceptual framework for my project because of their involvement in natural resource management. Moreover, some qualitative research concepts, for instance contextual analysis, are used for understanding the functions of the Qanat system as a sociocultural process. Also, I apply a literature review approach to examine some comparative traditional water systems across the world, together with the process of their replacement with contemporary modern paradigms. The literature review chapter can reveal that the current institutional arrangements of water management suffer from similar problems in many countries. By investigating the collapse of other traditional water systems, I argue that the socio-technical shift of water management in Iran originates from a worldwide transformation in the ...