Effect of snowmelt and climate change on design of urban storm water system

Snowmelt in urban areas is known to have strong influence on flooding in urban storm sewer systems. It has been argued that a change in climate can lead to even more flooding. To reduce the risk of incorrect design criteria it is important to study effect s of snowmelt and climate change on urban drainage systems. The main objective of this project is to investigate the effect of snowmelt and climate change on design of urban storm water systems. Urban flood frequency curves (FFC) will be developed for sum mer time and whole-year runoff data, using an urban hydrological model in combination with temporal downscaling techniques. The difference between FFC-summer and FFC-whole-year will directly quantify the effect of snowmelt on urban flood frequency. A simi lar approach will be used to study the effect of climate change on urban FFC. Based on the results from the investigations, guidelines for design of urban storm water systems will be developed.