Identification of flood‐prone areas with <scp>GeoFlood</scp> : Lessons learned from the Tiber River case study

Flood mapping is a vital component for sustainable land use in flood-prone areas. Due to the frequency of flood events, local authorities demand effective yet simple methods preliminary identification areas at large scales subsequently define mitigation strategies. We focus here on workflow GeoFlood, parsimonious model which uses only high-resolution Digital Terrain Models (DTMs) geomorphological and hydrological information necessary inundation mapping, thus allowing large-scale simulations reasonable computational cost. The purpose present study investigate conditions under GeoFlood able correctly reproduce scenarios (with an assigned return period) their flooding characteristics. Specifically, we analyze its performance over highly urbanized area, mid-lower portion Tiber River (Italy). simulated 200-year period scenario compared results those provided by authority. A sensitivity analysis performed quantify influence main geometric hydraulic parameters involved. Results show that produces rapid estimation than can be used support standard costly scales, quickly pointing out critical areas, with consideration all uncertainties