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    Revision Hazard Map Wald, Illnau-Effretikon and Gossau


    In January 2017, HOLINGER was commissioned by the Office for Waste, Water, Energy and Air (AWEL) of the Canton of Zurich to revise the hazard maps in three municipalities. A working group revised the flood hazard maps and created new hazard maps for mass movements in Illnau-Effretikon and Wald. In Gossau, only a partial revision was necessary for the Gossauerbach and the Wüeribach streams. The flood areas were identified using comprehensive 2D modelling. Once again, hydrology has proven to be the core issue in the process of hazard identification. After just over two years, the project is nearing completion.