ABSTRACT: Regional research provided new picture of hydrogeology in the Carpathian Flysch, Central-Carpathian Paleogene, Neogene and Quaternary aquifers, Spatial distribution of permaeability in the Flysch and the Central-Carpathian Paleogene is controlled much more by decrease of permaeability with depth than by lithology and shows some other specific regularities (weak relation of permeability to lithology, near-surface zone as the main continuous aquifer, significance of fracture zones), Different categories of transmissivity related to the position in the relief morphology are to be distinguished, Quantitative geohydraulic characteristics of particular Paleogene forrnations have been determined, In regions without data from wells, geohydraulic parameters are estimated by indirest merhods based on hydrometric, hydrochemical and geomorphometric data. The experience of using these methods optimized the estimates of transmissivity by new interpretation formulae, The
Neogene sediments show distinct statistical dependence of permeability on lithology. The decrease of their permeability with depth is less pronounced. The highest transmissivities are ob served (without any relation to lithology) in some fracture zones attached to young faults, In the neogene volcanics no significant difference between mean permeability of effusive and volcanoclastic rocks can be evidenced, Maximum transmissivities of the Quaternary aquifers (up to 3.10-2 m2/s) are found in young tectonic depressions with high thickness of fluvial gravels.