Heavy rain hazards – extreme heavy rain, water depths, model rain 2021 (WMS Service)

Maximum water depths (in m) for extensive block rains with 180 mm in 6 h, based on the main phase of the extreme severe weather of 14 July 2021 in the Ahr Valley. The determination was carried out using the hydrodynamic-numeric software HYDRO_AS-2D, which is based as a 2D simulation on the numerical solution of the flat water equation using the finite volume method (DGM as of 2019, consideration of evaporation, leaching, sewerage by flat-rate reduction of precipitation in abh. from land use); Lockwitzbach/Weißeritz with HQ 20; see also explanation in the themed city plan).