Bystrý potok (Zvolen)

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.

• Volcanic rocks50%SR 3.2 %
• River alluvium25%SR 72 %
• Granitoids25%SR 1.5 %

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Volcanic rocks: Silicate rocks; the water is usually soft to moderately mineralised.

Geological age of the rocks

• neovolcanic rocks50%
• Quaternary25%
• crystalline basement25%

Most common rock units

Quaternary cover

• Typical thickness of the Quaternary cover2.3m

• 0 – 250%SR 16 %
• 2 – 550%SR 48 %

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Tectonic units

• TATRIKUM and VEPORIKUM100%SR 7.8 %

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Tectonic division

• Paleo-Alpine tectonic units of the Inner Western Carpathians50%SR 16 %
• NEOALPÍNSKE TEKTONICKÉ ŠTRUKTÚRY ZÁPADNÝCH KARPÁT50%SR 84 %

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Neotectonic units

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

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Direction of neotectonic movements

• large uplift100%SR 26 %

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Regional geological division

• neovolcanic rocks100%SR 10 %

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Regional geological division (subunits)

• Central Slovak neovolcanic rocks100%SR 8.8 %

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Engineering-geological districts

• region of effusive rocks50%SR 3.1 %
• region of mountain-stream deposits25%SR 21 %
• region of magmatic intrusive rocks25%SR 3.0 %

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Engineering-geological formations

• neovolcanic formation50%SR 4.5 %
• formation of Quaternary sediments25%SR 71 %
• formation of Variscan granitoids25%SR 3.2 %

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Susceptibility of the area to slope deformations

• Region of stable areas100%SR 95 %

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The map covers 4 of 4 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)

• Gravel33%SR 52 %
• Acid plutonic rocks33%SR 3.7 %
• Acid volcanic rocks33%SR 3.2 %

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Aquifer type

• Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody (Gravel)33%SR 22 %
• Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody33%SR 3.7 %
• Menšie zvodnence s medzizrnovým alebo puklinovým typom priepustnosti alebo oblasti s takmer žiadnymi množstvami podzemnej vody33%SR 3.2 %

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Main hydrogeological region

• crystalline in the Detvian Basin and the Sihlian Plain in the Slatina Basin50%SR 0.0 %
• neovolcanic rocks of the Poľana mountain range and part of the Zvolen basin50%SR 0.0 %

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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–HCO₃–SO₄

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

Major ions

• PotassiumK2.10 mg/lpercentile 33
• SodiumNa5.13 mg/lpercentile 28
• ChloridesCl3.66 mg/lpercentile 25
• FluoridesF0.0581 mg/lpercentile 15
• SulphatesSO416.2 mg/lpercentile 9
• BicarbonatesHCO350.8 mg/lpercentile 7
• MagnesiumMg3.83 mg/lpercentile 6
• CalciumCa14.0 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 demandChSK3.11 mg/lpercentile 48
• NitratesNO34.86 mg/lpercentile 36
• AmmoniumNH40.0638 mg/lpercentile 32
• PhosphatesPO40.0434 mg/lpercentile 24

Metals

• IronFe0.100 mg/lpercentile 49
• AluminiumAl36.1 μg/lpercentile 34
• ManganeseMn7.35 μg/lpercentile 14
• ZincZn1.35 μg/lpercentile 6

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

• VanadiumV127 mg/kgpercentile 95
• CadmiumCd0.955 mg/kgpercentile 93
• CobaltCo13.6 mg/kgpercentile 92
• TinSn4.52 mg/kgpercentile 86
• BismuthBi0.400 mg/kgpercentile 85
• LeadPb22.7 mg/kgpercentile 77
• ZincZn138 mg/kgpercentile 77
• SeleniumSe0.388 mg/kgpercentile 76
• CopperCu28.8 mg/kgpercentile 68
• MercuryHg0.161 mg/kgpercentile 68
• AntimonySb0.911 mg/kgpercentile 68
• NickelNi21.0 mg/kgpercentile 32
• ArsenicAs4.95 mg/kgpercentile 25
• ChromiumCr54.0 mg/kgpercentile 22
• MolybdenumMo0.176 mg/kgpercentile 12

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)eTh9.32 ppm88th percentile
• Equivalent uranium (eU)eU2.73 ppm68th percentile
• Potassium (K)K1.34 %percentile 63

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 137CsCS1371,847 Bq/m²percentile 65

Radon risk by isopleths

• medium50%SR 64 %
• low50%SR 36 %

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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 depth65°C
• Surface heat flow density73mW/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.

• Elevation of geomorphological units (from–to)284–1 111m a.s.l.
• Average elevation of the units761m a.s.l.
• Average slope12.5°
• Average January temperature-4.4°C
• Average July temperature17.1°C
• Annual precipitation775mm

Geomorphological units

• Vepor Mountains100%SR 1.8 %

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Geomorphological regions

• Slovak Ore Mountains100%SR 10 %

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Climatic-geographical types

• basin climate50%SR 29 %
• mountain climate50%SR 33 %

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Soil contamination (map 1:500,000)

• uncontaminated soil, the geogenically determined content of some risk elements reaches limit values A100%SR 45 %

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Lithogeochemical types

• Neogene volcanics75%SR 11 %
• Plutonic rocks of the Central Western Carpathians25%SR 3.0 %

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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.

• SeleniumSebelow half of Slovakia
  highest 0.500 μg/lmedian 0.500 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 46 of all samples in Slovakia.

• LeadPbbelow half of Slovakia
  highest 2.50 μg/lmedian 2.50 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 43 of all samples in Slovakia.

• BariumBabelow half of Slovakia
  highest 32.0 μg/lmedian 21.0 μg/l2 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 39 of all samples in Slovakia.

• LithiumLibelow half of Slovakia
  highest 5.00 μg/lmedian 5.00 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 34 of all samples in Slovakia.

• ChromiumCrbelow half of Slovakia
  highest 1.00 μg/lmedian 1.00 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 32 of all samples in Slovakia.

• CadmiumCdbelow half of Slovakia
  highest 0.150 μg/lmedian 0.150 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka, 540 m from the water. Comparison: percentile 26 of all samples in Slovakia.

• CopperCubelow half of Slovakia
  highest 1.00 μg/lmedian 1.00 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 m from the water. Comparison: percentile 22 of all samples in Slovakia.

• ArsenicAsbelow half of Slovakia
  highest 0.500 μg/lmedian 0.500 μg/l2 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Riečka2008, 540 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 29.9 mg/lmedian 28.4 mg/l2 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Bystrý potok2008, 110 m from the water. Comparison: percentile 88 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.

• Ilmenit (FeTiO₃)31 samples, at most 1500 grains
• Rutil (TiO₂)27 samples, at most 350 grains
• Magnetite (Fe₃O₄)5 samples, at most 500 grains
• Pyrite (FeS₂)4 samples, at most 50 grains
• Scheelit (CaWO₄)3 samples, at most 4 grains
• Arsenopyrite (FeAsS)2 samples, at most 2 grains
• Barite (BaSO₄)1 sample, at most 55 grains
• Monazit ((Ce,La,Nd)PO₄)1 sample, at most 55 grains
• Gold (Au)1 sample, at most 1 grains

Nearest samples with gold

Rock-forming and accessory minerals

• Apatit (Ca₅(PO₄)₃(F,Cl,OH))33 samples, at most 500 grains
• Titanit (CaTiSiO₅)33 samples, at most 460 grains
• Pyroxény ((Mg,Fe,Ca)₂Si₂O₆)32 samples, at most 4204 grains
• Granáty ((Fe,Mg,Ca,Mn)₃Al₂Si₃O₁₂)31 samples, at most 550 grains
• Epidot (Ca₂(Al,Fe)₃Si₃O₁₂(OH))29 samples, at most 2000 grains
• Zirconium (ZrSiO₄)27 samples, at most 400 grains
• Korund (Al₂O₃)18 samples, at most 55 grains
• Amfiboly (Ca₂(Mg,Fe)₅Si₈O₂₂(OH)₂)8 samples, at most 350 grains
• Tourmalines (complex borosilicate)5 samples, at most 400 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.

Metals in groundwater

• CadmiumCdhigh (top 5 %)
  highest 1.40 μg/lmedian 0.250 μg/l25 samples68 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.1 km from the water. Comparison: percentile 98 of all samples in Slovakia.

• MercuryHghigh (top 5 %)
  highest 0.400 μg/lmedian 0.100 μg/l25 samples96 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 2.1 km from the water. Comparison: percentile 98 of all samples in Slovakia.

• LeadPbhigh (top 5 %)
  highest 6.00 μg/lmedian 0.500 μg/l25 samples76 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.7 km from the water. Comparison: percentile 97 of all samples in Slovakia.

• ChromiumCrhigh (top 5 %)
  highest 4.90 μg/lmedian 0.250 μg/l25 samples80 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 2.1 km from the water. Comparison: percentile 96 of all samples in Slovakia.

• ZincZnhigh (top 5 %)
  highest 1,068 μg/lmedian 0.500 μg/l25 samples72 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1991, 350 m from the water. Comparison: percentile 95 of all samples in Slovakia.

• SeleniumSeelevated (top 10 %)
  highest 2.00 μg/lmedian 1.00 μg/l25 samples44 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1991, 350 m from the water. Comparison: percentile 92 of all samples in Slovakia.

• AluminiumAlslightly elevated
  highest 0.0300 mg/lmedian 0.00500 mg/l25 samples80 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.8 km from the water. Comparison: percentile 85 of all samples in Slovakia.

• AntimonySbslightly elevated
  highest 0.200 μg/lmedian 0.100 μg/l25 samples88 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.1 km from the water. Comparison: percentile 83 of all samples in Slovakia.

• ArsenicAsslightly elevated
  highest 1.00 μg/lmedian 0.500 μg/l25 samples96 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.6 km from the water. Comparison: percentile 80 of all samples in Slovakia.

• CopperCutypical value
  highest 1.20 μg/lmedian 0.500 μg/l25 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1991, 350 m from the water. Comparison: percentile 58 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: studňa1991, 1.5 km from the water. Comparison: percentile 50 of all samples in Slovakia.

• LithiumLibelow half of Slovakia
  highest 6.00 μg/lmedian 1.00 μg/l25 samples56 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: prameň1991, 1.6 km from the water. Comparison: percentile 45 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.

Ore occurrences in the metallogenic map

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.

8 boreholes in the 3 km zone, of which 3 hydrogeological and 5 other; with an archive report number 8.

Borehole depths

• up to 10 m1×
• 10–30 m0×
• 30–100 m0×
• 100–300 m1×
• over 300 m1×

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

Landslides and slope deformations

Register of documented slope deformations (Geofond). Landslides by a stream can bring fine material into the water, change the bed and dam the channel.

Types of deformations

• Landslides26×

Degree of activity

• Potenciálny25×
• Stabilizovaný1×

Current state

• SD zaregistrovaná v rámci terénneho výskumu na úlohe Atlas S26×