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Research project (§ 26 & § 27)
Duration : 2020-01-01 - 2021-06-30

The water supply of the state of Lower Austria is to be ensured in the long term. Although the available quantities for drinking water, industry and agriculture will undoubtedly be sufficient for the future, there are clear regional differences. An important objective of water management (and also of local policy), namely to use as much local resources as possible without the need for trans-regional transfers through water supply networks, can already be fulfilled in some regions (eg Weinviertel), in other regions (eg B. Waldviertel), it can be expected in the future that demand will no longer be covered economically locally. The indication of the usable groundwater supply thus requires in the first step the estimation of the groundwater recharge, and in the second step the assumption of a share of it, the removal of which does not impair the ecological functioning of the waters. In a third step, it must be clarified whether and where exactly this available quantity can be taken from a technical and economic point of view, thus becoming economically viable groundwater supply. The group Water in the office of the NÖLR sees in the studies available so far no sufficiently reliable basis for a forward-looking planning of the water supply until the year 2050 more. The planned study therefore pursues the goal of determining the future use of groundwater by means of a hydrological model in which, in particular, changes due to climate change can be mapped. In addition, it can also be used to make statements about the seasonality of the groundwater characteristics. The subject of the project is therefore water balance simulation with the hydrological model (COSERO), with the objectives: - Analysis of seasonal groundwater recharge, groundwater storage characteristics and baseline runoff - Analysis of the spatio-temporal trends of groundwater recharge - Quantitative analysis of the development of groundwater recharge by 2050
Research project (§ 26 & § 27)
Duration : 2012-12-01 - 2013-10-30

The project "development in flood prone areas: assessment of flood management alternatives" has the goal to develope integrated strategies to reduce flood risk at the federal level to support the implementation of the EU flood risk directive. Previous project have shown the necessity to analyse and to assess the various flood risk management alternatives. There seems to be also the need for an improved communication and cooperation among the various actors in this domain. The instruments should be assesed with respect to legislative and economic criteria and their potential for integrated application to reduce flood risk. The deficits of the instruments should be assessed especially in APSFR regions.
Research project (§ 26 & § 27)
Duration : 2019-11-01 - 2020-06-30

Net fishing in the previous years of investigation (to check the condition factors of the most common fish species of the Alte Donau) resulted in reduced catches despite increased fishing effort. However, simultaneous electrofishing could not confirm a decrease in abundances. Nevertheless, discussions with the local managers indicate that the typical fish species in open water are no longer found in particularly high stocks. The reasons for this may be many, but cannot be clearly identified at present. In order to continue the long-term data series, the condition factors will again be determined using net equipment in the 2019/2020 monitoring. At the same time, the abundances of typical Alte Donau fish species will continue to be observed, thus monitoring the condition of the overall ecosystem. Regardless of the condition factors - but still in view of the declining abundances - net fishing will also be carried out from spring 2020, when the spawning season begins. These will be carried out in parallel with the investigation of fish eggs from the cuttings. The collected fish eggs will be analysed by means of metabarcoding in order to draw conclusions on the species diversity. This helps to understand which fish species are particularly endangered by the mowing process in their choice of spawning substrate. Using presence/absence data, affected fish species can be recorded. Parallel net fishing will support the metabarcoding data collected.

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