**2. Modelling and numerical simulation of groundwater flow in the Čenkov reparian alluvial aquifer**

#### **2.1 The long-term minimal anthropogenic disruption in natural conditions in of the study area**

The solution of groundwater flow features assessments, which are due to later anthropogenic investigations into the area are ranked as almost natural, are going out from the evaluation of former groundwater regimes based on observations in the nature, knowledge of geological structure of the area and hydrogeologic conditions, which is serving as a base to the water-level regime assessment and the subsequent assessment of the main groundwater flow directions.

The aim of the task to be solved is to create a numerical model for a steady groundwater flow in the reparian alluvial aquifer of the Čenkov plain, and its calibration, verification and obtaining of results by a simulation that is at groundwater level, using filtration velocity vectors, groundwater paths by particle tracking and the water budget. One assumption is that long-term minimal anthropogenics disrupted the natural conditions of the study area. As the date of the simulation was chosen on the day of 29 September 1954, because of the steady state of water flow through the study area, and also of the Danube low stage and because of existence of solving similar task by other methods in the past (Duba, 1964) and thereby available data needed for modelling and simulation.
