Record details

    Hard-rock hydrogeology in the Czech Republic
Statement of responsibility
    Jiří Krásný
Other titles
    Les eaux souterraines et l'hydrogéologie en République tcheque (Variant.)
    Hydrogéologie des milieux de socle en République tcheque
    Krásný, Jiří
Source title - serial
    No. 2
    p. 25-38
    10 obr., 2 tab., 2 s.bibl.
    Francouzské resumé
    Zkr. název ser.: Hydrogéologie
Subject group
    Český masiv
    hydrogeologie regionální
    kvalita vody
    zásoba vody
Geographical name
    Česká republika
Abstract (in english)
   Igneous, metamorphic and strongly cemented Proterozoic and Lower Palaeozoic sedimentary (non-carbonate) rocks crop out extensively in the Czech republic. Such hard-rock hydrogeological environments have been considered during hydrogeological studies, the results of which are presented here. Regional transmissivities in hard-rock environments, as determined by aquifer tests in wells, generally range from 10-5 to slightly more than 10-4 m2/d. The spatial distribution of permeability and transmissivity is considerably influenced by rock heterogeneity, mainly due to fracturing rather than petrological variations (apart from certain exceptions, e.g. crystalline limestone). Groundwater runoff in hard-rock areas ranges from 1-2 l/s/km2 in low-elevation areas to more than 10 l/s/km2 in high-elevation areas. Bicarbonate and/or sulphate and calcium are generally the dominant ions in hardrock groundwater. Total Dissolved Solids (TDS) are low, commonly 100 to 300 mg/l.
   TDS and pH values generally decrease with increasing altitude, whereas relative sulphate contents tend to increase, possibly due to contamination by acid rain. In general, hard rocks do not seem to significantly influence the chemical composition of shallow groundwater. The hydrochemical anomalies observed in certain areas of the Bohemian Massif indicate a vertical hydrochemical zoning, as is known in other crystalline massifs, including high sodium-chloride contents in the deep groundwater
    Česká geologická služba
Contributor code
    ČGS (UNM)
Source format
Entered date
    28. 1. 2008
Import date
    8. 8. 2012