The EHGL maps for the Berlin glacial valley, the Teltow Plateau and the Nauen Plate, which were developed using numerical groundwater flow models (see Methodology), have an extraordinarily comprehensive statistical base.
The geological sections from the State Geological Service were available for capturing the hydrogeological structure of the main aquifer in the Berlin glacial valley. Additionally, numerous deeper boreholes from the database of the State Geological Service were evaluated.
The configuration data of over 1,300 groundwater measuring points and their groundwater level data were used for calibrating and verifying the groundwater models. Moreover, information on the groundwater withdrawals of all Berlin waterworks, on groundwater replenishments and on other groundwater extractions (unwatering, private water supply plants, remediation) was available.
The surface waters, which are the receiving waters for groundwater, determine essential hydraulic conditions. A multitude of data – mostly gauge heights – and information on the state of development of the water bodies was used in this regard.
Data on new groundwater formation taken from the map of the Environmental Atlas (SenStadtUm 2012) was integrated into the model.
The hydrographs of about 2,200 groundwater measuring points were evaluated for the Berlin glacial valley area to check the plausibility of the computed EHGL map. For the Teltow Plateau and the Nauen Plate areas, it was about 1,100.
Moreover, a very comprehensive pool of further hydrogeological, water management, geographical and historical sources of information was used.
The hydrographs of about 150 further groundwater measuring points were evaluated to develop the EHGL map for the Panke valley. Comprehensive data on the geology of the Panke valley aquifer that is available to the Senate Department was also used. Gauge heights were available for the Panke and some of its tributaries.
The EHGL map draws on the statistical base used for the current groundwater isoline plans, which comprises 98 measuring points. After a statistical analysis of the groundwater levels at 43 representative measuring points, this data was used for the area of the Barnim Plateau south-east of the Panke valley.