Conditions on the effectiveness of the SaferPlaces solution are related to the following aspects: SaferPlaces offers a faster hazard mapping solution with simple “fill and spill” algorithm where the dynamic effects are neglected (i.e., the algorithm does not solve the equations of hydrodynamics, but it simply assesses the extension of the flooding event and the water level in the depressions). The service provides a “picture at a the end of the flood” for a specific input of flood scenarios (for 3 types of hazards: pluvial, fluvial, and coastal). On the other hand, the time required to run each simulation is very little, less than a few minutes, allowing for quickly testing various scenarios and conditions. It is thus particularly suitable in the plains, where the flooding phenomenon is not governed by slope, and it primarily proceeds through cascading reservoirs that activate when the water level exceeds the boundary embankments and/or in the presence of connections such as underpasses. Should such condition be too restrictive, SaferPlaces offers (for pluvial/fluvial hazard) a 2D dynamic model that provides water depth during flood simulation for snapshots “at chosen times during the flood event”, while velocity patterns are not provided in the actual implementation of SaferPlaces. The retrieval of high-resolution data is needed to build the digital twin of the city. Just exploiting open-source data, the SaferPlaces platform already covers at 1m resolution all Europe and USA, which are our main targeted markets. For the rest of the world, SaferPlaces has the geospatial data to reach a 20/30m resolution, which still allows to simulate the desired flood scenarios in urban environments but provides a lower resolution output as a result. However, open LIDAR data are increasingly available in many cities worldwide and their acquisition cost is becoming very competitive thanks to the possibility to exploit UAV and DRONES or airborne LIDAR. A good example is provided by the National Italian Extraordinary Plan of Remote made around 2008 that produced the first round of LIDAR at national level, with results perfectly suitable for SaferPlaces’ applications. Such data is nowadays accessible and periodically updated/extended upon initiatives of the single Regions/Civil Protection Agencies/River District Authorities/Cities/Multiutilities at a fraction of the costs of the first national plan, with higher accuracy and resolution. The same for Radar data that are made available by local authorities (meteorological and environmental agencies, regional governments, etc). While updated with links to new open datasets at any major release, SaferPlaces currently not providing an automatic search of the new data eventually available, it is thus designed to integrate them in the process of digital twin creation once the user provides them.