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Wuppertal, Germany

The failure of the dam body of a dam system can result in serious harm to the people, the environment and the economy. The operator of a dam system is responsible for its safety, and is obliged to appoint suitable specialist personnel with adequate qualifications for its operation. An essential component of the system-specific safety concept is the professional qualification of the personnel employed for its operation and maintenance. It is therefore the responsibility of the operator to ensure that his personnel management is based on continual further training of the operating personnel.

As a result of the new DIN 19700, an in-depth study was begun at the Wupperverband. For this purpose a start was made with the Bever Dam. It was possible to make important findings here and synergies could be generated between individual line departments. It was possible to use these as early as the subsequent in-depth studies, such as on the Wupper Dam. In this regard sub-projects can be completed collectively for all dams of the Wupperverband. Experiences and long-term benefits should be explained using practical examples.

The relevance of eutrophication related processes for the ecological integrity of rhithral streams and thus for the challenge to accomplish a good ecological status is outlined. Consequently, the need for establishing adequate eutrophication monitoring and assessment procedures in running waters is recommended. If the restoration of eutrophicated rhithral streams is to be successful restoration measures not only have to rely upon a proper phosphorus management but inevitably need to be embedded in an integral ecosystem oriented approach. However, the underlying mechanisms of this multiple cause effect relations have to be acknowledged.

The holistic watershed-scale approach ("Integrale Talsperrenbewirtschaftung") considers the transport and fate of water, sediments, chemicals, nutrients and bacteria in the terrestrial and aquatic compartments to be tidily interlinked. Therefore, the reservoirs water quality and water quantity can not be managed disparately. If the reservoirs management is to be eficient not only the multiple environmental compartments (grassland, agricultural land, forest; streams, reservoir) but also their interplay has to be managed appropriately. Due to saturation effects input management is of major importance for reducing the input of sediments, nutrients and chemicals into the aquatic environment. In order to improve the nutrient management at the source e.g. farmer cooperations ("Landwirtschaftliche Kooperationen") have been built. Additionally however, the ecosystem structure of each compartment needs a proper management in order to increase the natural retention capacity not only of the landscape but also of the aquatic ecosystems (ecotechnological approach). Accordingly, the processes that remove transform and store water and substances have to be considered. The particularities for each environmental compartment as well as its proper management are discussed. In general, increasing water retention reveals of major importance for increasing sediment, nutrient and chemical retention capacity in the environmental compartments.

Willmitzer H.,Thuringer Fernwasserversorgung | Grosse N.,Limnosa Sachverstandigenburo | Mehling A.,Harzwasserwerke GmbH | Nienhuser A.,Bergischen Trinkwasser Verbund GmbH BTV | And 2 more authors.
GWF, Wasser - Abwasser | Year: 2010

Advantageous effects of zooplankton grazing in establishing high water quality in lakes and reservoirs often have been documented. Zooplankton filtration, particularly by larger daphnids, distinctly reduces particle concentrations in the water column giving rise for clearwater. Consequently, water processing treatment costs are reduced. In 2009, ATT has finished a zooplankton project which related the results of microscopic zooplankton analysis and water quality data from 53 reservoirs in Germany. There is ample evidence from the results, that the potential of biofiltration can be assessed from the analysis of zooplankton community size. Accordingly, a CSI (=community size index) as a new method for the assessment of bio filtration in reservoirs was created. The CSI revealed as a valuable tool for optimizing food-web management in reservoirs. Thus, as top-down control is to be an essential tool for reservoirs water quality management beside external nutrient abatement reservoir water quality management can be improved.

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