Analys av översvämningar i ledningsnät i Kungshult – effekt av klimatförändringar / Analysis of the sewer network in Kungshult – effects of climate change
Flooding in urban areas has increased and due to this fact extensive research about the effects of climate change on extreme rainfall is being done. This study is an attempt to determine how large the increase of extreme rainfall will be in Scania, Sweden. Through a literature study it is found that the recurrence interval of extreme rainfall will be at least halved during the next century, corresponding to an increase of rain intensities of approximately 20–40 %. Through hydraulic modeling, the impacts of a changing climate on the sewer network of village Kungshult are analyzed. Flooding in both the storm- and wastewater systems have occurred during summer storms the last years. The analysis of the storm water model show that flooding is expected to occur every 5 years today and even more often in the future. With larger pipe dimensions and retention basins in the most flooded areas, the system will be well prepared for future extreme rainfall. In the wastewater system, a total of 0.6 ha of impervious surfaces are connected, causing flooded basements during extreme rainfall. These surfaces need to be found and connected to the storm water system to prevent further flooding in basements.