Large-scale technical systems or Large Technical Systems (LTS) are socio-technical structures with large spatial extent and profound social interdependencies. They can be found in many different areas, private or professional, physical or abstract, and their backbone is usually the use of technical apparatus that has become a normality in the life of modern man. This "networking of reality" appears to be continuously increasing due to the ever-growing possibilities of the digital information and computer technology. More and more devices are being linked together either to further extend their range of influence or to generate additional value, which makes Large Technical Systems gain ever more omnipresence and critical importance for our society. The underlying infrastructure of computer science and information technology can generally be regarded as a LTS or at least as parts of it and represents in this context the study object. ^Yet, computer science is still a relatively young science, but in contrast, there are plenty of great examples of Large Technical Systems in the field of engineering, such as large infrastructure systems like water supply systems. The present work attempts to transfer the methodological approach of the historian of technology Thomas P. Hughes, the so-called "LTS Approach", to the historical events during the emergence and implementation of a Large Technical System, the water supply system of the city of Vienna, and in doing so, better understand its genesis. The objective of this diploma thesis is, on the one hand, to study a Large Technical System and increase the understandings about its implementation. Which of the by Hughes LTS-approach (if any) predetermined characteristics and phases were also present in this case study, or which institutions and types of protagonists played a crucial role in the genesis of the system. ^And furthermore, this experience should help to increase the general knowledge of the dynamics of modern Large Technical Systems, such as those of computer and information technology networks.