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Expected Highest Groundwater Level (EHGL) 2018

Statistical Base

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.

Sixty geological sections from the State Geological Service were available for capturing the hydrogeological structure of the main aquifer in the Berlin glacial valley. They were supplemented by evaluating numerous deeper boreholes from the database of the State Geological Service.

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 recipients for the 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.

The data for new groundwater formation were implemented into the model from the map of the Environmental Atlas (SenStadtUm 2012).

The hydrographs of about 2,200 groundwater measuring points were evaluated for the Berlin glacial valley area and of about 1,100 for the Teltow Plateau and the Nauen Plate areas, in order to check the plausibility of the computed EHGL map.

Moreover, a very comprehensive pool of further hydrogeological, water management, geographical and historical sources of information was available.

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 are available to the Senate Department were also used. Gauge heights were available for the Panke and some of its tributaries.