VN Tríbeč – Sekanina

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.

Quaternary cover

• aeolian sediments100%SR 3.8 %

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

• Typical thickness of the Quaternary cover7.5m

• 5 – 10100%SR 20 %

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 0 of 1 points on the water line.

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

• PotassiumK3.19 mg/lpercentile 53
• SodiumNa9.68 mg/lpercentile 53
• ChloridesCl9.48 mg/lpercentile 51
• SulphatesSO433.4 mg/lpercentile 40
• MagnesiumMg11.2 mg/lpercentile 36
• BicarbonatesHCO3141 mg/lpercentile 30
• CalciumCa41.7 mg/lpercentile 29
• FluoridesF0.0506 mg/lpercentile 5

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

• Chemical oxygen demandChSK7.26 mg/lpercentile 93
• NitratesNO38.55 mg/lpercentile 66
• AmmoniumNH40.0914 mg/lpercentile 43
• PhosphatesPO40.0494 mg/lpercentile 27

Metals

• IronFe0.528 mg/lpercentile 93
• AluminiumAl244 μg/lpercentile 84
• ManganeseMn66.8 μg/lpercentile 70
• ZincZn10.5 μg/lpercentile 67

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

• ArsenicAs15.3 mg/kgpercentile 86
• CobaltCo11.7 mg/kgpercentile 85
• BismuthBi0.255 mg/kgpercentile 63
• AntimonySb0.796 mg/kgpercentile 62
• MolybdenumMo0.423 mg/kgpercentile 58
• ZincZn101 mg/kgpercentile 55
• VanadiumV69.7 mg/kgpercentile 53
• CopperCu24.3 mg/kgpercentile 53
• TinSn2.64 mg/kgpercentile 49
• NickelNi22.8 mg/kgpercentile 41
• SeleniumSe0.196 mg/kgpercentile 37
• LeadPb13.5 mg/kgpercentile 37
• ChromiumCr55.3 mg/kgpercentile 23
• MercuryHg0.0553 mg/kgpercentile 17
• CadmiumCd0.0590 mg/kgpercentile 8

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.

• Potassium (K)K1.98 %percentile 95
• Equivalent uranium (eU)eU3.36 ppm93th percentile
• Equivalent thorium (eTh)eTh8.47 ppm77th percentile

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 137CsCS1372,654 Bq/m²percentile 83

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 depth75°C
• Surface heat flow density75mW/m²

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

Soil contamination (map 1:500,000)

• relatively clean soil100%SR 53 %

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: Kompanová2010, 160 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: Kompanová2010, 160 m from the water. Comparison: percentile 75 of all samples in Slovakia.

• BariumBatypical value
  highest 44.0 μg/lmedian 44.0 μg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Kompanová2010, 160 m from the water. Comparison: percentile 54 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: Kompanová2010, 160 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: Kompanová2010, 160 m from the water. Comparison: percentile 43 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: Kompanová2010, 160 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: Kompanová, 160 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: Kompanová2010, 160 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 22.1 mg/lmedian 22.1 mg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Kompanová2010, 160 m from the water. Comparison: percentile 79 of all samples in Slovakia.

Gold and ore minerals in river sediments

Regional panning prospecting: the heavy fraction was washed out of river gravel and the mineral grains in it were counted. The map of finds is positive: a sample without gold is not listed in the atlas, so the absence of a find is not proof that there is no gold.

• Anatas (TiO₂)2 samples, at most 5 grains
• Hematite (Fe₂O₃)2 samples, at most 815 grains
• Ilmenit (FeTiO₃)2 samples, at most 815 grains
• Magnetite (Fe₃O₄)2 samples, at most 315 grains
• Monazit ((Ce,La,Nd)PO₄)2 samples, at most 5 grains
• Rutil (TiO₂)2 samples, at most 5 grains
• Limonite (FeO(OH)·nH₂O)1 sample, at most 55 grains
• Barite (BaSO₄)1 sample, at most 5 grains

Rock-forming and accessory minerals

• Epidot (Ca₂(Al,Fe)₃Si₃O₁₂(OH))2 samples, at most 815 grains
• Granáty ((Fe,Mg,Ca,Mn)₃Al₂Si₃O₁₂)2 samples, at most 5 grains
• Pyroxény ((Mg,Fe,Ca)₂Si₂O₆)2 samples, at most 5 grains
• Titanit (CaTiSiO₅)2 samples, at most 74 grains
• Tourmalines (complex borosilicate)2 samples, at most 55 grains
• Zirconium (ZrSiO₄)2 samples, at most 155 grains
• Amfiboly (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)1 sample, at most 5 grains
• Apatit (Ca₅(PO₄)₃(F,Cl,OH))1 sample, at most 315 grains

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-HCO32×
• Ca-SO4-HCO31×
• Ca-NO3-SO41×
• Ca-Mg-HCO31×
• Ca-Mg-SO4-HCO31×

Water quality class according to the hydrogeochemical map

• class F1×
• class A1×
• class E1×
• class H1×
• class B1×
• class C1×

Metals in groundwater

• LeadPbextreme (top 1 %)
  highest 270 μg/lmedian 0.500 μg/l11 samples73 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 1.9 km from the water. Comparison: percentile 100 of all samples in Slovakia.

• ZincZnelevated (top 10 %)
  highest 771 μg/lmedian 10.0 μg/l11 samples9 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 810 m from the water. Comparison: percentile 93 of all samples in Slovakia.

• ArsenicAselevated (top 10 %)
  highest 2.90 μg/lmedian 1.60 μg/l11 samples27 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1992, 1.2 km from the water. Comparison: percentile 92 of all samples in Slovakia.

• AntimonySbslightly elevated
  highest 0.200 μg/lmedian 0.100 μg/l11 samples82 % 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 83 of all samples in Slovakia.

• CopperCuslightly elevated
  highest 2.50 μg/lmedian 0.500 μg/l11 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 2.1 km from the water. Comparison: percentile 80 of all samples in Slovakia.

• LithiumLislightly elevated
  highest 17.0 μg/lmedian 5.00 μg/l11 samples9 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1992, 2.2 km from the water. Comparison: percentile 76 of all samples in Slovakia.

• ChromiumCrtypical value
  highest 0.600 μg/lmedian 0.250 μg/l11 samples91 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1992, 2.1 km from the water. Comparison: percentile 69 of all samples in Slovakia.

• IronFetypical value
  highest 0.00500 mg/lmedian 0.00500 mg/l6 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, 810 m from the water. Comparison: percentile 50 of all samples in Slovakia.

• CadmiumCdbelow half of Slovakia
  highest 0.250 μg/lmedian 0.250 μg/l11 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, 2.1 km from the water. Comparison: percentile 47 of all samples in Slovakia.

• MercuryHgbelow half of Slovakia
  highest 0.100 μg/lmedian 0.100 μg/l11 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, 2.1 km from the water. Comparison: percentile 46 of all samples in Slovakia.

• SeleniumSebelow half of Slovakia
  highest 0.500 μg/lmedian 0.500 μg/l11 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, 2.1 km from the water. Comparison: percentile 39 of all samples in Slovakia.

• AluminiumAlbelow half of Slovakia
  highest 0.00500 mg/lmedian 0.00500 mg/l11 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, 2.1 km from the water. Comparison: percentile 30 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.

14 boreholes in the 3 km zone, of which 11 hydrogeological and 3 other; with an archive report number 14.

Borehole depths

• up to 10 m0×
• 10–30 m4×
• 30–100 m8×
• 100–300 m2×
• 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.

Waste landfills