Expected Mean Highest Groundwater Level (EMHGL) 2016
The EMHGL map for the Berlin glacial valley, which was developed using a numerical groundwater flow model (see Methodology in explanation of EHGL map, and Limberg, Hörmann & Verleger (2010)), has an extraordinarily comprehensive statistical base.
57 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 800 groundwater measuring points and their groundwater level data were used for calibrating and verifying the groundwater model. 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 selection of the groundwater level data that were suitable for the model simulation of the EMHGL was based on about 2,200 groundwater measuring points.
In addition, the map of the expected highest groundwater level (EHGL) for the area of the Berlin glacial valley and the Panke valley was available for checking the plausibility of the results.
The hydrographs of about 150 further groundwater measuring points were evaluated for developing the EMHGL map for the Panke valley (see Methodology in explanation of EHGL map, and Hörmann & Verleger (2016)). Comprehensive data on the geology of the Panke valley aquifer that are available at the State Geological Service were also used. Gauge heights were available for the Panke and some of its tributaries.