Natural hazard mitigation constitutes one of the most challenging tasks of hydraulic engineering in theXXIst century. Climate changes accerelate the appearance of more and more extreme events, such as floodevents, debris flows, landslides, avalanches, etc.AquaVision Engineering actively works in this field by developing flood inundation and/or danger maps forSwiss villages and cantons. The establishment of these maps is based on sound and detailed 2D numericalmodelling of the involved physical phenomena. Second, sound hydrological modelling constitutes a basic premise for natural hazard estimates. We offerspecific services in the field of hydrology, ranging from straightforward statistical analysis and rainfall-runoff relationships up to complex physically based modelling of large catchment areas.Exciting projects actually being performed and managed by AquaVision Engineering are the debris flowmitigation measures being developed along the Tinière River at Villeneuve, or also the flood danger mapsof the whole city of Geneva.