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Berlin, Germany

The depth to shallow groundwater tables in the forest areas of the state of Brandenburg was computed within areas of unconfined groundwater as the difference between the groundwater level and the ground-surface level. Special attention had been dedicated to the digital processing of the data in order to make the investigations technically comprehensible and reproducible for future uses with better or updated data. The depth to the groundwater table was computed in four typical hydrologic reference periods when flood or low water had prevailed. In addition to fixed-day measurements of groundwater and surface water levels, other water-level data were also integrated in the analysis and were related to the reference periods by statistical methods. The results are used in an interdisciplinary project of the Eberswalde Forestry Competence Centre, where they are used to solve forest-ecological and sylvicultural problems. Source

For the castle chain of lakes near Penkun in the southeast of Mecklenburg-Vorpommern, an elevation in the lake water surface levels is planned. Sites for possible groundwater abstractions were explored hydrogeologically. Reason for these considerations was the decrease of the water level of the castle lake-chain of lakes. Source

Hannappel S.,HYDOR Consult GmbH | Zippel M.,HYDOR Consult GmbH | Scheytt T.,TU Berlin | Klein-Goedicke J.,Umweltbundesamt
Wasser und Abfall

For active drug substances, a mathematical simulation of the contamination from surface waters into groundwater through bank filtration was realized. The results could be verified on the basis of measured concentrations in known locations. Source

Due to high nitrogen concentrations, two groundwater bodies in Northern Brandenburg were classified under the heading "poor (chemical) condition" according to the Water Framework Directive of the European Commission. These evaluations of the "Landesumweltamt Brandenburg" were based on several investigations that compared the hydrogeochemical data with the quality norm for nitrate and with the threshold value for ammonia from the European Groundwater Directive. By sampling with direct push techniques, we re-analysed the extent of contamination in order to decide whether the water quality could be improved in a cost-effective manner. Based on the newly established data set, the area of contamination could be more precisely delineated with geostatistical techniques. This helped to determine whether the previous evaluation of local groundwater quality was still valid. © 2010 Springer-Verlag. Source

Muller B.,TU Berlin | Scheytt T.,TU Berlin | Zippel M.,HYDOR Consult GmbH | Hannappel S.,HYDOR Consult GmbH | And 2 more authors.
Water, Air, and Soil Pollution

In recent years, human pharmaceutical substances have been increasingly detected in the aquatic environment. Specific attention has been drawn to the occurrence of pharmaceutical substances at bank filtration sites which are used for drinking water production. In the course of the authorisation application for new pharmaceutical compounds, an environmental risk assessment is required. Currently, the expected concentration of the human pharmaceutical compound in groundwater at bank filtration sites is calculated following the guideline Pre-Authorisation Evaluation of Medicines for Human Use issued by the European Medicines Agency (EMEA 2006). A simple estimation is applied: The predicted environmental concentration (PECGW) is the predicted environmental concentration in surface water (PECSW) multiplied with 0.25. A new approach considering the hydraulic and hydrogeological characteristics of bank filtration sites as well as transport processes is presented in this study. First, a numerical groundwater flow model was developed to simulate the groundwater flow processes at bank filtration sites in general. Flow times were calculated as a function of the hydraulic and hydrogeological parameters: hydraulic conductivity, shore-well distance, screen depth and extraction rate. In a second step, the PECGW was calculated based on the compound concentration in surface water and the modelled groundwater flow times considering linear sorption and first-order decay. Sorption and degradation can only be calculated based on the data provided by the pharmaceutical company in the course of the authorisation application. The current approach following the EMEA guideline invariably connects the PECGW with the PEC SW without considering sorption and/or degradation processes. We introduce an approach that incorporates the hydraulic process bank filtration and the main transport processes sorption and degradation. The new approach is compound specific as well as aquifer, flow and transport specific resulting in a more realistic PECGW value compared to the old approach. © 2010 Springer Science+Business Media B.V. Source

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