18The occurrence of floods is the most frequent natural disaster, affecting both rural and urban settlements. Flooding is a 19 global phenomenon which causes widespread devastation, economic damages and loss of human lives (Jha et al., 2012).
20For many years, the dam construction has been a common practice in the fluvial systems management, for water supply, 21 irrigation, hydroelectric generation and flood control. These practices produce important hydrological, sedimentological and 22 morphodynamic changes in the modified watercourses (Vericat and Batalla, 2004;Graf, 2006, Gregory, 2006, Schmidt and 23 Wilcock, 2008, Ma et al., 2012, Grant, 2012, Xia et al., 2016, generally decreasing their discharge, sediment load and 24 erosion and flood hazard towards downstream. Assuming these conditions as infallible, induces the advance of urbanization 25 on the alluvial plains, which leads to a potential increase of flood risk during extraordinary events, mal function or dam 26 failure operation, among others (Dewan et al., 2007, Bosisio, 2011. The flood risk associated to fluvial systems has 27 increased in the last decades in most countries worldwide due to the absence or inefficiency of the land use plans, especially 28 those related to the urban expansion in the alluvial plains (Tucci Morelli,
