Green infrastructure (GI) for stormwater management, i.e. alternative measures to reduce runoff volumes and associated pollutant loads by facilitating retention, infiltration, and evapotranspiration receives increasing attention by urban drainage professionals. This is due to its positive impacts on the urban hydrological cycle, the environment and the liveability of urban areas. Furthermore, GI is also expected to have a better potential to mitigate negative effects of climate change and urbanization than conventional technologies. The attractiveness of GI raises the need for more detailed knowledge about the functionality and reliable simulation models. Many of today´s urban drainage models describe GI in a rather simplified way, as they were developed to plan conventional systems.
In this project we work to deepen the understanding of the functionality of GI and develop suitable process based modelling tools. A data base containing extensive measurements from a number of different GI-sites in Sweden and France will be set up. Procedures for data validation and uncertainty quantification will be defined and applied to all measurements. The data will then be used to improve existing and develop new modelling concepts for both, water quantity and quality. They should as far as possible be based on the physical processes and a suitable spatial representation of GI facilities. Methods for systems analysis will support this process and the uncertainties of model predictions will be assessed. The variety of sites allows considering different climatic and environmental conditions.
The expected outcomes, i.e. better understanding of the functionality and simulation models for green infrastructure will support urban drainage professionals in planning and designing new facilities. This can contribute to a more widespread implementation of alternative measures for stormwater management.
The project is conducted in cooperation with the Laboratory for Waste, Water, Environment and Pollution DEEP at the National Institute of Applied Sciences of Lyon (INSA Lyon), France.