Flood risk assessment of the European road network Kees C.H. van Ginkel (1,2)*, Francesco Dottori (3), Lorenzo Alfieri (3,4), Luc Feyen (3), Elco E. Koks (2,5) (1) Deltares, Boussinesqweg 1, 2629 HV Delft, The Netherlands 5 (2) Institute for Environmental Studies, VU University, Amsterdam, The Netherlands (3) European Commission, Joint Research Centre, Ispra, Italy (4) CIMA Research Foundation, University Campus of Savona, Savona, Italy (5) Environmental Change Institute, University of Oxford, Oxford, United Kingdom *Corresponding author:
[email protected] 10 ORCIDs: Kees van Ginkel: 0000-0002-8162-221X Francesco Dottori: 0000-0002-1388-3303 Lorenzo Alfieri: 0000-0002-3616-386X 15 Luc Feyen: 0000-0003-4225-2962 Elco Koks: 0000-0002-4953-4527 Abstract River floods pose a significant threat to road transport infrastructure in Europe. This study presents a high-resolution object-based continental-scale assessment of direct flood risk of the European road 20 network for the present climate, using high-resolution exposure data from OpenStreetMap. A new set of road-specific damage functions is developed. The expected annual direct damage from large river floods to road infrastructure in Europe is 230 million euro per year. Compared to grid-based approaches, the object-based approach is more precise and provides more action perspective for road owners, because it calculates damage directly for individual road segments, while accounting 25 for segment-specific attributes. This enables the identification of European hotspots, such as roads in the Alps and along the Sava River. A first comparison to a reference case shows that the new object-based method computes realistic damage estimates, paving the way for targeted risk reduction strategies.