Conference Agenda

In the last decade, green and blue roofs have gained ground as distributed solutions in urban areas, given that roofs cover a large percentage of cities land and climate change is often producing heavier stormwater events, not always properly handled by existing centralised infrastructures. The design of such type of distributed infrastructure involves some challenges, such as the identification of the design hyetograph, characterized by certain rainfall duration and return time. The simulation of the process dynamics related to the water storage and release in and from these tanks allows an appropriate selection of the outflow devices which could ensure the compliance with the maximum water level and downstream flow to avoid any flood damage or the occurrence of structural and operational issues on the roof. An Excel-based tool has been developed to support the simulation and selection of outflow devices which release the outflow into the receiving stormwater systems. The tool highlights for which rain duration a certain outflow device satisfies the requirements in terms of maximum outflow and water level in the roof. A case study in Norway was adopted for demonstration purposes of the tool usage.