Hidrológiai Közlöny, 2017 (97. évfolyam)
2017 / 3. szám - MANAGING WATER QUALITY (ONGOING PROJECTS AND FUTURE CHALLENGES) - Novak, Vladimír - Láng István: Co-operation between the Slovak Republic and Hungary in the hydrology of transboundary waters
60 Hidrológiai Közlöny (Hungarian Journal of Hydrology) 2017. 97. évf. 3. sz. The expert group for hydrology, within the “Joint working group for the quality of transboundary waters and hydrology” fulfils the tasks resulting from the Rules of Exchange of Hydrological Data and Information such as measuring, exchanging data, harmonising the results of measuring and processing), performing the joint analyses of data and approving of maximum and minimum flows on boundary profiles, harmonising the methodologies and processing hydrological data. In 2006, the joint values ofN-year maximum flows for bridge profiles on the River Ipel / Ipoly (Pösténpuszta - Pefov and Rárospuszta — Raros) were approved. In the same year, the values of common ecological minimum flows on the entire common Slovak and Hungarian section of the River Ipel / Ipoly were approved. On 23 October 2007, Directive 2007/60/EC of the European Parliament and of the Council on the assessment and management of flood risks was adopted. In accordance with national legislations, the background data for the preparation of flood risk maps and flood hazard maps of the boundary rivers (N-year flows) are to be prepared in the respective commissions of transboundary waters. These issues are dealt with by the expert group for hydrology. The longitudinal profiles ofN-year maximum flows on the River Danube from Devin to Budapest have been processed gradually (Figure 1), as well as the common values ofN-year maximum flows on the boundary profiles of the River Homád / Hemád and River Slaná / Sajó; currently (the second half of 2017), the calculations ofN-year maximum flows on the River Bodva are carried out and should be approved in autumn 2017. Figure 1. Longitudinal profile ofN-year maximum flows on the River Danube from Devin to Budapest DATA EXCHANGES At the meetings of the “Joint working group for the quality of transboundary waters and hydrology”, hydrology experts inform each other on the cooperation in utilising the data resulting from the innovation of the monitoring network, on detailed balancing of flows in a monthly cycle, and also on the preparation of Hood risk management plans in each country. In the area of underground water data exchange, eight areas of common interest were specified and 56 mutually approved underground water bodies were selected in accordance with Directive 2000/60/EC of the European Parliament and of the Council of 23 October 2000, establishing a framework for Community action in the field of water policy in the transboundary Slovak and Hungarian territory. Since 2011, basic annual hydrological data from the hydrological networks of underground waters for the specified areas and underground water bodies have been bilaterally exchanged on an annual basis. At the same time, a summary of annual withdrawn quantities of underground waters exploited in individual underground water bodies is provided. Negotiations also include the exchange of information on the changes in the structure of observation networks of underground waters, on the progress in measurement automation and prognoses of utilisation of new water sources of ordinary and geothermal waters in the transboundary territory. The exchange of the operative data necessary for the activity of hydrological forecasts and warnings takes place at a standard level in accordance with the Annexes to the Rules of Exchange of Hydrological Data and Information. The data exchange exceeding the Annex is carried out on the basis of a contract between organisations. Moreover, the Slovak Party (Slovak Hydrometeorological Institute and the state enterprise Slovensky vodohospodársky pod- nik, s.p.) is involved in the DARREFORT Project as a partner. The project is to regulate the data policy of the Danube States.
