Hydrodynamic and slope stability modelling of flood protection embankments and valley dams

Hydrology conditions in recent years clearly demonstrate that flood protection is a priority task for Hungarian water management, and its importance cannot be questioned. This study examines three flood control embankments and two dams, including their subsoil characteristics. The examinations also contain the modelling of slope stability and seepage conditions. The seepage models were created with the Groundwater Modeling System 10 SEEP2D module, which uses the finite element method. As a part of the examination of the seepage models, we examine the free flows and the embankments' seepage conditions. Changing the modelling parameters also affects seepage conditions. Thus we examine the effects of the embankment's foot width and on the total flowrate and the seepage conditions. Our examination also includes a study about the effects of neglecting the subsoil in computations. For the slope stability examinations, both the Groundwater Modeling System UTEXAS module and the Soilvision SVSlope module are used, and their results are compared, showing significant differences. While the slope stability measurements were done in a dry state, we also examined the effects of pore water pressure on the embankments' stability. Modelling methods are useful and simple methods for the examination of seepage and slope stability of flood control embankments and can provide great help to flood protection professionals.