VN Veľké Vozokany

Geological structure beneath the water

Which rock lies beneath the water line (Geological Map of Slovakia 1:50,000), how old it is, how thick the Quaternary cover is and in which tectonic unit the water flows. The bedrock decides the hardness of the water, the bottom, the turbidity after rain and the abundance of springs.

The points follow the water line (for a stream and a basin, fishing district after fishing district). The strip is a cross-section by distance, not a map; the width of a section corresponds to the number of points.

• River alluvium100%SR 72 %

marker on the bar: share among all sample points on streams in Slovakia

River alluvium: Gravelly and sandy bottom and floodplains; the water is replenished from groundwater in the alluvium.

Geological age of the rocks

• Quaternary100%

Most common rock units

Tectonic division

• NEOALPÍNSKE TEKTONICKÉ ŠTRUKTÚRY ZÁPADNÝCH KARPÁT100%SR 84 %

marker on the bar: share among all sample points on streams in Slovakia

Neotectonic units

• positive unit (mountain range)100%SR 60 %

marker on the bar: share among all sample points on streams in Slovakia

Direction of neotectonic movements

• medium uplift100%SR 32 %

marker on the bar: share among all sample points on streams in Slovakia

Regional geological division

• intramontane basins100%SR 44 %

marker on the bar: share among all sample points on streams in Slovakia

Regional geological division (subunits)

• Danube Basin100%SR 23 %

marker on the bar: share among all sample points on streams in Slovakia

Susceptibility of the area to slope deformations

• Region of stable areas100%SR 95 %

marker on the bar: share among all sample points on streams in Slovakia

The map covers 1 of 1 points on the water line.

Hydrogeology: aquifers and groundwater

Streams and rivers are fed by groundwater. Hydrogeological maps show in which rocks the water is stored, how permeable they are and what the water in them is like. The data come from ŠGÚDŠ maps, not from measurements at a particular water.

Aquifer rocks (hydrogeological map 1:200,000)

• Sand100%SR 3.9 %

marker on the bar: share among all sample points on streams in Slovakia

Aquifer type

• Zvodnence s prevažne medzizrnovým typom priepustnosti (prevažne nespevnené sedimenty) (Sand; Lakustrinné)100%SR 0.5 %

marker on the bar: share among all sample points on streams in Slovakia

Main hydrogeological region

• Neogene of the Hronská pahorkatina100%SR 1.4 %

marker on the bar: share among all sample points on streams in Slovakia

Geothermal groundwater bodies

• Komjatice Depression100%SR 2.1 %

marker on the bar: share among all sample points on streams in Slovakia

Surface water chemistry according to the atlas

Modelled composition of the water in the area the fishing district line runs through. The rasters of the Geochemical Atlas of Slovakia (surface waters) are an interpolation of measurements in sampled streams, so they show the typical background of the area, not a measurement in a particular stream.

Ionic composition of the water

Water type by dominant ions: Ca–Mg–HCO₃

Shares are in equivalents, the usual way of comparing the composition of waters.

Major ions

• ChloridesCl40.3 mg/lpercentile 86
• MagnesiumMg28.5 mg/lpercentile 83
• SodiumNa19.0 mg/lpercentile 78
• PotassiumK5.61 mg/lpercentile 78
• BicarbonatesHCO3291 mg/lpercentile 74
• CalciumCa79.4 mg/lpercentile 69
• SulphatesSO447.2 mg/lpercentile 58
• FluoridesF0.0686 mg/lpercentile 23

dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)

Nutrients and organic pollution

• PhosphatesPO40.927 mg/lpercentile 93
• NitratesNO313.9 mg/lpercentile 84
• AmmoniumNH40.288 mg/lpercentile 77
• Chemical oxygen demandChSK4.18 mg/lpercentile 70

Metals

• ZincZn15.2 μg/lpercentile 79
• ManganeseMn94.3 μg/lpercentile 78
• IronFe0.183 mg/lpercentile 72
• AluminiumAl114 μg/lpercentile 64

Elements in river sediments

The Geochemical Atlas of Slovakia (river sediments) describes what the river carries in the fine material on its bed. Sediment collects metals from rocks, ore occurrences and past mining and industry. It is not a legal limit or a health risk assessment: it shows how an element on this stream ranks among streams in Slovakia.

Potentially toxic and trace elements

• ArsenicAs24.7 mg/kgpercentile 92
• CobaltCo10.3 mg/kgpercentile 74
• VanadiumV78.5 mg/kgpercentile 70
• ZincZn103 mg/kgpercentile 56
• TinSn2.80 mg/kgpercentile 56
• MolybdenumMo0.372 mg/kgpercentile 49
• CopperCu23.4 mg/kgpercentile 49
• NickelNi24.3 mg/kgpercentile 49
• ChromiumCr69.2 mg/kgpercentile 45
• AntimonySb0.572 mg/kgpercentile 43
• MercuryHg0.0847 mg/kgpercentile 40
• SeleniumSe0.195 mg/kgpercentile 37
• CadmiumCd0.117 mg/kgpercentile 31
• BismuthBi0.152 mg/kgpercentile 23
• LeadPb11.5 mg/kgpercentile 23

dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)

Natural radioactivity and radon

Airborne gamma-ray spectrometry by ŠGÚDŠ measures radiation from potassium, uranium and thorium in rocks and soil. Granites and some acidic volcanic rocks have the highest values, limestones and floodplains the lowest. Caesium-137 is a remnant of fallout from the Chernobyl accident and nuclear weapons tests.

• Equivalent thorium (eTh)eTh9.90 ppm93th percentile
• Equivalent uranium (eU)eU3.14 ppm87th percentile
• Potassium (K)K1.36 %percentile 66

dot: average along the water line, line: from the lowest to the highest value, scale: position among sample points on streams in Slovakia (0 to 100th percentile)

• Areal activity of 137CsCS1374,179 Bq/m²percentile 94

Radon risk by isopleths

• medium100%SR 64 %

marker on the bar: share among all sample points on streams in Slovakia

Geophysical fields: magnetics and gravity

Maps of the magnetic field and gravity (ŠGÚDŠ) reveal what lies beneath the sediments and the surface: volcanic bodies, faults and crustal thickness. For an angler they are interesting indirectly: they show where the bedrock changes, and with it the water.

Geothermal potential

The Atlas of Geothermal Energy of Slovakia records rock temperature and heat flow from the Earth's interior. It is the potential of the area, not the actual warmth of the water in the stream. Specific geothermal boreholes and springs near this water are in the geothermal energy section below.

• Rock temperature at 2,000 m depth85°C
• Surface heat flow density75mW/m²

Geothermal groundwater bodies beneath the water line

• Komjatice Depression100%SR 2.1 %

marker on the bar: share among all sample points on streams in Slovakia

Relief, climate and soils

A basin is not just water: slope and elevation determine the speed of runoff, climate the temperature and amount of water, and soils what is washed into the stream. The data come from the geomorphological division, climatic-geographical types and soil maps of ŠGÚDŠ.

• Average January temperature-2.8°C
• Average July temperature19.0°C
• Annual precipitation675mm

Climatic-geographical types

• lowland climate100%SR 38 %

marker on the bar: share among all sample points on streams in Slovakia

Susceptibility of soils to acidification

• soils susceptible to acidification100%SR 31 %

marker on the bar: share among all sample points on streams in Slovakia

Soil contamination (map 1:500,000)

• relatively clean soil100%SR 53 %

marker on the bar: share among all sample points on streams in Slovakia

Lithogeochemical types

• Neogene100%SR 48 %

marker on the bar: share among all sample points on streams in Slovakia

Map of the corridor

Where the nearest mine workings, deposits, burdens, geothermal boreholes and gold finds are. Groups can be switched off.

Trace elements in surface waters

Arsenic, antimony, cadmium, lead, copper, zinc and other elements in samples from rivers and streams (Geochemical Atlas of Slovakia, surface waters, 2015). The bar shows where the highest value lies among all samples in Slovakia; the light marker is the median of the samples at this water.

• LithiumLislightly elevated
  highest 10.0 μg/lmedian 10.0 μg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 75 of all samples in Slovakia.

• ArsenicAsslightly elevated
  highest 2.00 μg/lmedian 2.00 μg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 75 of all samples in Slovakia.

• SeleniumSebelow half of Slovakia
  highest 0.500 μg/lmedian 0.500 μg/l1 sample100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 46 of all samples in Slovakia.

• LeadPbbelow half of Slovakia
  highest 2.50 μg/lmedian 2.50 μg/l1 sample100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 43 of all samples in Slovakia.

• BariumBabelow half of Slovakia
  highest 32.0 μg/lmedian 32.0 μg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 39 of all samples in Slovakia.

• ChromiumCrbelow half of Slovakia
  highest 1.00 μg/lmedian 1.00 μg/l1 sample100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 32 of all samples in Slovakia.

• CadmiumCdbelow half of Slovakia
  highest 0.150 μg/lmedian 0.150 μg/l1 sample100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina, 840 m from the water. Comparison: percentile 26 of all samples in Slovakia.

• CopperCubelow half of Slovakia
  highest 1.00 μg/lmedian 1.00 μg/l1 sample100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 22 of all samples in Slovakia.

Major ions, mineralisation and pH

Basic water chemistry: which rocks the minerals in it come from.

• Silicon dioxideSiO2slightly elevated
  highest 19.4 mg/lmedian 19.4 mg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Širočina2010, 840 m from the water. Comparison: percentile 76 of all samples in Slovakia.

Groundwater: chemistry, water types and radioactivity

Hydrogeochemical objects (analyses of springs and boreholes), the geochemical atlas of groundwater (1996) and radiohydrochemical sampling. Groundwater feeds streams, so its composition also affects the water in the stream.

Chemical water types nearby

• Ca-Mg-HCO32×

Water quality class according to the hydrogeochemical map

• class A1×
• class G1×

Metals in groundwater

• CopperCuextreme (top 1 %)
  highest 127 μg/lmedian 6.10 μg/l7 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 1.5 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• CadmiumCdextreme (top 1 %)
  highest 6.50 μg/lmedian 0.250 μg/l7 samples86 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 1.5 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• AluminiumAlhigh (top 5 %)
  highest 0.180 mg/lmedian 0.0700 mg/l7 samples14 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 1.5 km from the water. Comparison: percentile 98 of all samples in Slovakia.

• ArsenicAshigh (top 5 %)
  highest 7.50 μg/lmedian 2.80 μg/l7 samples29 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 96 of all samples in Slovakia.

• ZincZnelevated (top 10 %)
  highest 925 μg/lmedian 89.0 μg/l7 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 94 of all samples in Slovakia.

• LeadPbelevated (top 10 %)
  highest 2.00 μg/lmedian 1.00 μg/l7 samples29 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 90 of all samples in Slovakia.

• SeleniumSeslightly elevated
  highest 1.40 μg/lmedian 1.00 μg/l7 samples29 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 87 of all samples in Slovakia.

• AntimonySbslightly elevated
  highest 0.300 μg/lmedian 0.100 μg/l7 samples57 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 87 of all samples in Slovakia.

• LithiumLislightly elevated
  highest 25.0 μg/lmedian 14.0 μg/l7 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 1.5 km from the water. Comparison: percentile 83 of all samples in Slovakia.

• ChromiumCrslightly elevated
  highest 1.10 μg/lmedian 0.500 μg/l7 samples14 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 2.8 km from the water. Comparison: percentile 79 of all samples in Slovakia.

• IronFetypical value
  highest 0.00500 mg/lmedian 0.00500 mg/l3 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 1.5 km from the water. Comparison: percentile 50 of all samples in Slovakia.

• MercuryHgbelow half of Slovakia
  highest 0.100 μg/lmedian 0.100 μg/l7 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1992, 2.4 km from the water. Comparison: percentile 46 of all samples in Slovakia.

Radon in waters

Mine workings, deposits and ore occurrences

Old mine workings outside mining areas (Geofond register), deposits and mining areas, and the metallogenetic map. Gold, silver and other metals near streams can get into sediments and water.

Deposits and mining areas

Boreholes and Geofond archive reports

Register of hydrogeological boreholes, other boreholes and geothermal boreholes. Each borehole has a report in the Geofond archive (geological profiles, pumping tests, chemical analyses of the water); the report number is in the table.

36 boreholes in the 3 km zone, of which 9 hydrogeological and 27 other; with an archive report number 36.

Borehole depths

• up to 10 m15×
• 10–30 m4×
• 30–100 m5×
• 100–300 m4×
• over 300 m0×

Nearest boreholes

Geothermal energy and mineral waters

Geothermal boreholes (wellhead water temperature, yield, chemical type) and sources of geothermal and mineral waters within 10 km. Data on the use and existence of a borehole come from the Geofond register.

Sources of geothermal and mineral waters

Environmental burdens, landfills and anthropogenic sediments

Recorded environmental burdens (industrial sites, landfills, mining), the register of waste landfills and monitoring of anthropogenic sediments (industrial sludge). It is a list of places, not a measurement of water pollution.

Environmental burdens

Waste landfills