Hydrology and Earth System Sciences www.hydrol-earth-syst-sci.net 1027-5606 1607-7938 12 3 2008 10.5194/hess-12-825-2008 http://www.hydrol-earth-syst-sci.net/12/825/2008/ http://www.hydrol-earth-syst-sci.net/12/825/2008/hess-12-825-2008.html http://www.hydrol-earth-syst-sci.net/12/825/2008/hess-12-825-2008.pdf 825 839 2008-05-27 Region-of-influence approach to a frequency analysis of heavy precipitation in Slovakia L. Gaál ladislav.gaal@chmi.cz J. Kyselý J. Szolgay Radar Department, Czech Hydrometeorological Institute, Na Šabatce 17, 143 06 Prague 4, Czech Republic Inst. of Atmospheric Physics, Academy of Sciences of the Czech Republic, Boční II 1401, 141 31 Prague 4, Czech Republic Department of Land and Water Resources Management, Faculty of Civil Engineering, Slovak University of Technology, Radlinského 11, 813 68 Bratislava, Slovakia The paper compares different approaches to regional frequency analysis with the main focus on the implementation of the region-of-influence (ROI) technique for the modelling of probabilities of heavy precipitation amounts in the area of the Western Carpathians. Unlike the conventional regional frequency analysis where the at-site design values are estimated within a fixed pooling group (region), the ROI approach as a specific alternative to focused pooling techniques makes use of flexible pooling groups, i.e. each target site has its own group of sufficiently similar sites. 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