Groundwater: Thickness of the unsaturated soil zone The geometric data were developed in 2013 as part of the project "Distance to the groundwater table of the main aquifer in Brandenburg". The thickness of the unsaturated soil zone is defined as the perpendicular distance between the ground surface and the groundwater pressure surface. Approximately 14,100 boreholes and a kriging interpolation method were used for the regionalization. The resolution took place in a grid of 10x10 m. Calculated areas of < 25,000 m2 are included in the enveloping area. Lakes with an area of < 25,000 m2 were not taken into account and were also included in the surrounding area. Open pit areas (as of 2011) were cut out. As a result of the processing, more than 37,700 individual areas in 13 classes of thickness could be documented. Of this, 31% of the land surface has an unsaturated soil zone < 2 m and 50% < 5 m thick.
