## The model of current state.

The described 3D model was prepared for the current state of the free surface of the groundwater and the model was verified by comparison of the predicted and measured data. The determined water levels served as a prognosis of the change caused by the construction. The piezometric level in the bottom layer is larger than the level of the free surface of the groundwater, implying a trend of vertical water flow from the Neogene to the Quaternary. The differences in water level between the top and the bottom layers are 0 to 2 m.