GIS-baserad sårbarhetskartering av VA -system med avseende på klimatförändringar / GIS-based methodology for vulnerability mapping of the water and wastewater system in view of climate change
Urban infrastructure, such as the water and wastewater system, is at particular risk following climate change. Identifying vulnerable parts of the system contributes to safe and sustainable water and wastewater handling in a long term perspective. The aim of this study was to further develop a GIS-based methodology for mapping physical vulnerability of urban water systems. Vulnerability indices were created and developed for the pipe network, groundwater sources and urban drainage in view of climate related threats. Studied vulnerability was the risk for pipe network break due to landslide. For groundwater vulnerability due to an increased risk of pollution from three sources were studied; MIFO-objects (risk classified objects), farmland, and local sewage treatment. For urban drainage flooding risk due to under-designed stormwater pipes and surface runoff to topographic low points were studied. The methodology was applied to the municipality of Bromölla, in South Sweden. The resulting maps where used to identify vulnerable parts of the above infrastructure. An uncertainty analysis was performed as a complement to the vulnerability mapping. The method is well suited for visualizing the physical vulnerability of water and wastewater systems at a municipal level and for evaluation by decision makers.