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analytics & monitoring

analytics & monitoring

A profound knowledge of a water body is essential for an ecological assessment. Only a deep understanding of the interactions of environmental factors and biocoenoses enables the preparation of deficit analyses and the development of concepts for improving the ecological status of water bodies. Therefore, a detailed investigation of the aquatic life and the most important impact factors is at the beginning of a limnological analysis.


since 1998 Investigations of impacts of sewage treatment plants in rivers

The ecological functioning of waterbodies describes their causal network between habitat and its organismic colonization. The use of water, for example for the discharge of waste water, should be in line with the ecological functioning. DWS Hydro-Ökologie is a reliable partner for wastewater treatment associations and municipalities in the field of outsourcing, as it investigates the influence of the waste water discharge on the biological quality elements (macrozoobenthos and phytobenthos) as well as the chemical-physical parameters according to the specifications of the quality target regulation.

since 1996 Monitoring of biological quality elements in compliance with the Austrian Water Law (WGEV, GZÜV)

The water status monitoring pursuant in accordance with GZÜV (formerly WGEV), which is anchored in the Austrian Water Law, is one of the main pillars of water protection in Austria and complies with the requirements of the EU Water Framework Directive. For many years, DWS Hydro-Ökologie has carried out the corresponding surveys on running waters from Vorarlberg to Burgenland. Examples are the assessments of the Austro-Hungarian border waterbodies on the basis of the biological quality elements macrozoobenthos, phytobenthos and fish, the recordings of macrophytes in Upper Austria or the phytoplankton counts on the large rivers Danube, March and Thaya.

Tasks: Fieldwork surveys, laboratory analyses (mikroskopy), assessments and ecological evaluations

Client: Federal ministry of agriculture and forestry, environment and water management, federal states

2019-2020 RaabSTAT

Following the Raab survey from 2008/2009, a new investigation of the river Raab was carried out in 2019 and 2020, ranging from the upper reaches in Styria to the lower river stretch in Hungary. The work was part of a bilateral INTERREG project and was carried out in Austria in a consortium of Umweltbundesamt and DWS Hydro-Ecology. The project aim was to assess the ecological and chemical status of the river Raab.

Tasks: Field and lab work for phytobenthos and macrozoobenthos, fish-ecological assessment based on existing data
Client: Amt der Bgld. Landesregierung, Abt. 5 Baudirektion, Hauptreferat Umweltwirtschaft

2019 Phytobenthos analyses from rivers in Slovenia

Task: Taxonomic analysis of phytobenthos samples (diatoms, non-diatoms) from Slovenia

Client: Eurofins

2011-2018 Diatom analyses from rivers in Eastern Germany

At irregular intervals, DWS Hydro-Ecology carries out taxonomic analyses of diatoms from rivers in eastern Germany.

Client: Centre for Environmental Research (UFZ)

2016-2017 Schwechat study

In 2015, DWS Hydro-Ecology was asked to carry out basic hydrological and limnological investigations in the river system of Schwechat and Baden Mühlbach. The aim of the study was to make a proposal for residual flow for the river Schwechat downstream of the ‘Helenenwehr’ in order to restore the river continuum. The analyses included flow measurements, calculations of chemical immission and hydrological modelling.

Client: Government of Lower Austria

2011-2016 Monitoring of impacts of Bti on chironomids in the floodplains of Morava and Thaya

The aim of this study was the monitoring of possible impacts of Bti, which is used against mosquitoes in the Morava-Thaya floodplains, on other non-target organisms, especially non-biting midges or chironomids, one of the most important aquatic invertebrate groups in the water bodies studied. The results were published in a scientific journal (Link)

Client: Gelsenverein March-Thaya-Auen (according to the permit under Water Law)

2012 Evaluation of fish passes at the river Rabnitz

As part of the implementation of the EU Water Framework Directive, several fish passes were built on the river Rabnitz in central Burgenland in 2013. The aim was to restore the river continuum for migratory fish species.

Contribution of DWS Hydro-Ecology: Fish-ecological monitoring (elektro fishing, assessment, expert report)

Client: Amt der Bgld. Landesregierung, Abt. 5

2012 Literature study on chloride

Each year, abour 271,000 tons of road salt are spread in Austrian for the winter service. The salt reaches soil, groundwater and surface waters without being retained or decomposed. For several years, DWS Hydro-Ecology has been dealing with potential impacts of salt contamination on the ecological integrity of the our waters. Based on own investigations, we prepared an extensive literature study on chloride in surface waters, which was published by the former Ministry of Life and can be downloaded on the Ministry’s website (https://www.bmnt.gv.at/wasser/wasserqualitaet/chloridstudie.html).

Client: Federal Ministry of Agriculture and Forestry, Environment and Water Management

2008-2009 Raab survey

The Raab survey 2008/2009 was an extensive bilateral monitoring program at the river Raab between the source and the mouth. It was carried out for the Austrian-Hungarian Water Commission and involved various institutions such as the Federal Environment Agency Vienna, the University for Agriculture and private contractors. In cooperation with the consultant G. Woschitz, DWS Hydro-Ecology carried out an electro-fishing campaign between Wollsdorf and the state border, which formed the basis for fish-ecological asessments.

Tasks: Field work, assessment and reporting
Client: Federal Environment Agency Vienna

2006 Monitoring of cooling water discharge into the Danube River in Vienna

Rising temperatures resulting from global warming as well as discharges of cooling water are a significant risk for rivers. Over several years, DWS Hydro-Ecology investigated possible impacts from cooling water on the macrozoobenthos of the Danube River and abjacent oxbows lakes in the Lobau floodplain.

Client: Wienstrom GmbH

2001 Chemical-biological preservation of evidence of Kobersdorfer Mühlbach before the construction of the forest lake Kobersdorf

In 2001, a base study was carried out with regard to the construction of a forest lake near Kobersdorf. The aim of the work was a primary demonstration of macrozoobenthos of the Kobersdorfer Mühlbach upstream and downstream of the current construction site for the lake. The further processing and evaluation of these two samples was based on the “Guideline for the determination of the saprobiological water quality of running waters”. In addition, besides qualitative zoobenthos sampling of representative choriotopes, general documentation of the two sites and the measurement of physical-chemical parameters was conducted.

Client: Office of the federal gouvernment of Burgenland