Groundwater dynamics

The representation of groundwater dynamics includes different layers: Support points, hydroisohypses, hydroisohypses in the loess area, hydroisohypses of uncertain course, groundwater influence by mining and groundwater fluid level. The data is based on the groundwater assessment carried out throughout Saxony in spring 2016 (April) in the upper main aquifer (pore aquifer). The elevations of the hydroisohyps refer to meters above NHN. In addition, hydroisohypses can be displayed in the loess area, whereby the thickness of the loess layer may vary within an area. Since, despite the widespread spread, it is not safe to determine whether these loess layers form a contiguous aquifer or only local overlaps, the discharge behaviour cannot be clearly recalculated. These resulting uncertainties should be taken into account when considering the hydroisohypses in the loess area. The identification of hydroisohyps with an uncertain course exists in the areas of the Vorerzgebirgssenke and in the loess area or where plausibility testing due to low measurement point density is only possible to a limited extent. The support points used for the creation of the groundwater surface are also available. These represent the measured values of the groundwater level in meters above NHN as part of the 2016 reporting date. The groundwater corridors in the loose rock and loess areas, as well as the Vorerzgebirgssenke, are indicated in meters below terrain with a resolution of 50 m x 50 m. The presentation of the groundwater flux levels is based on the hydroisohyps of the reporting date measurement in spring 2016. In this respect, the corridor distances were created by cutting the grid of the terrain top edge (DGM) with the previously determined grid of groundwater dynamics. The areas affected by mining have disturbed groundwater dynamics or complex hydrodynamic conditions, so that a representation of hydroisohyps and groundwater flux levels with sufficient accuracy cannot be guaranteed. The representations of hydroisohyps and groundwater flux levels reflect the equilibrium state of groundwater conditions for the reporting date measurement in spring 2016. However, the groundwater surface is in constant change, so a map representation can always only reflect the situation at a certain point in time. In order to be able to make a more comprehensive and precise statement about the groundwater conditions at a certain point, it is also advisable to look at the measured values or gear line sequences of surrounding groundwater measuring stations. The map is progressively updated and depending on the progress of knowledge. The LfULG is happy to receive any information about this at any time.