Road networks are essential foreconomic, social, environmental, and security reasons. Roadnetworks are therefore considered critical networksaccording to the consequences of their disruptions (Tacnetand Mermet 2012). Flooding poses an important threat toroads, and can lead to massive obstruction of traffic anddamage to road structures, with possible long-term effects(Buren and Buma 2012). Flooding leads to significant repaircosts for road control authorities, access difficulties foremergency services (Versini, Gaume, and Andrieu 2010a), anddisruption for road users and the community at large. Theconsequences for businesses and the economy in general canbe very significant (Brabhaharan, Wiles, and Frietag 2006).Because of the time and costs required for rebuilding,sustainable and long-term planning is crucial; therefore,the consideration of flood risk constitutes an importantinput for decision making in planning this type ofinfrastructure. Flood risk analysis for road networks allowsplans to be carried out in an appropriate manner, allocatingresources for prevention, mitigation, and restoration(Balijepalli and Oppong 2014; Jenelius and Mattsson 2014).This report summarizes the main concepts and methodologiesthat are used to assess flood risk for road networks. Thereport presents references and examples, and is intended tobe a starting point for practitioners in the field.
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