Introduction: This thesis focuses on evaluating the sustainability of water and sewerage renewal in Jönköping Municipality through document studies and simulations. The aim is to identify vulnerabilities within the stormwater system and present sustainable solutions to reduce the risk of flooding and backflow. By combining different investigation methods, the work aims to contribute with insights and solutions for long-term sustainable stormwater management. 

Method: The study uses a case study approach in the form of a document study to review relevant documents and laws governing stormwater management. This quantitative method is complemented by a further case study based on a simulation to gain a deeper understanding of stormwater management in the municipality of Jönköping and how different changes affect the system. 

Results: The chapter presents the data collection from the document study and the simulation, giving an overview of the stormwater management in the municipality and its effectiveness with respect to the identified vulnerabilities. The results of the study shows that an increasing trend of annual rainfall requires improved climate adaptation measures, and current infrastructures need to be optimized to cope with future conditions. 

Analysis: Here, the results of the document study and simulation are linked to the theoretical framework to analyse the effectiveness of stormwater management and its ability to meet the challenges of rising precipitation levels and urbanisation.  

Discussion: The discussion focuses on identifying and addressing vulnerabilities within the stormwater system and presenting sustainable solutions to address future challenges. By integrating knowledge from different sources and following guidelines from both national and local authorities, the municipality can create effective strategies for water supply renewal and stormwater management. A reflection on the methods used and their contribution to fulfil the research objectives concludes the chapter.