Aszódsky kanál

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 alluvium80%SR 72 %
• Young sediments20%SR 8.6 %

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

Quaternary cover

• fluvial sediments of floodplains91%SR 68 %
• organogenic sediments9.1%SR 0.4 %

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

• Typical thickness of the Quaternary cover247m

• 200 – 30033%SR 0.8 %
• 300 – 40033%SR 1.2 %
• 150 – 20022%SR 0.6 %
• 60 – 8011%SR 0.5 %

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Tectonic division

• NEOALPÍNSKE TEKTONICKÉ ŠTRUKTÚRY ZÁPADNÝCH KARPÁT100%SR 84 %

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Neotectonic units

• negative unit (lowland plains and basins, neotectonic depressions)100%SR 13 %

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Direction of neotectonic movements

• large subsidence91%SR 2.8 %
• medium subsidence9.1%SR 6.8 %

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Regional geological division

• intramontane basins100%SR 44 %

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Regional geological division (subunits)

• Danube Basin100%SR 23 %

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Engineering-geological districts

• region of alluvial-plain deposits100%SR 15 %

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Engineering-geological formations

• formation of Quaternary sediments100%SR 71 %

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Susceptibility of the area to slope deformations

• Region of stable areas100%SR 95 %

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The map covers 5 of 11 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)

• Gravel100%SR 52 %

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Aquifer type

• Zvodnence s prevažne medzizrnovým typom priepustnosti (prevažne nespevnené sedimenty) (Gravel; Fluviálne)100%SR 27 %

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Type of permeability (basic hydrogeological map 1:50,000)

• intergranular100%SR 86 %

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Hydrogeological function

• aquifer100%SR 95 %

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Main hydrogeological region

• Quaternary of the southwestern part of the Danube Plain100%SR 5.3 %

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Genetic type of groundwater

• fluviogenic100%SR 14 %

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Chemical type of groundwater

• Ca-Mg-HCO373%SR 26 %
• Ca-SO4-HCO327%SR 3.8 %

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

Groundwater quality class

• D90%SR 15 %
• H10%SR 8.8 %

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Geothermal groundwater bodies

• Central depression of the Danube Basin100%SR 21 %

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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–Mg–HCO₃

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

Major ions

• FluoridesF0.183 mg/lpercentile 76
• ChloridesCl21.3 mg/lpercentile 70
• SodiumNa13.9 mg/lpercentile 68
• MagnesiumMg19.3 mg/lpercentile 64
• SulphatesSO451.2 mg/lpercentile 62
• BicarbonatesHCO3223 mg/lpercentile 53
• CalciumCa63.5 mg/lpercentile 51
• PotassiumK2.58 mg/lpercentile 43

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

• AmmoniumNH40.140 mg/lpercentile 58
• PhosphatesPO40.170 mg/lpercentile 56
• Chemical oxygen demandChSK2.58 mg/lpercentile 35
• NitratesNO34.26 mg/lpercentile 30

Metals

• ManganeseMn88.6 μg/lpercentile 77
• IronFe0.154 mg/lpercentile 66
• ZincZn9.54 μg/lpercentile 63
• AluminiumAl36.6 μg/lpercentile 34

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

• MolybdenumMo0.505 mg/kgpercentile 70
• BismuthBi0.272 mg/kgpercentile 67
• ArsenicAs7.91 mg/kgpercentile 64
• CopperCu26.4 mg/kgpercentile 61
• NickelNi26.6 mg/kgpercentile 59
• LeadPb15.7 mg/kgpercentile 51
• CobaltCo8.38 mg/kgpercentile 49
• SeleniumSe0.215 mg/kgpercentile 42
• MercuryHg0.0866 mg/kgpercentile 41
• ZincZn85.4 mg/kgpercentile 37
• CadmiumCd0.129 mg/kgpercentile 35
• VanadiumV61.2 mg/kgpercentile 33
• TinSn2.24 mg/kgpercentile 32
• ChromiumCr55.5 mg/kgpercentile 24
• AntimonySb0.349 mg/kgpercentile 17

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 uranium (eU)eU2.59 ppm50th percentile
• Potassium (K)K1.27 %percentile 36
• Equivalent thorium (eTh)eTh7.01 ppm36th 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 137CsCS1372,079 Bq/m²percentile 72

Radon risk by isopleths

• medium67%SR 64 %
• low33%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.

Geothermal groundwater bodies beneath the water line

• Central depression of the Danube Basin100%SR 21 %

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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)103–191m a.s.l.
• Average elevation of the units117m a.s.l.
• Average slope0.4°
• Average January temperature-2.5°C
• Average July temperature20.0°C
• Annual precipitation590mm

Geomorphological units

• Danubian Plain100%SR 8.4 %

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Geomorphological regions

• Danubian Lowland100%SR 18 %

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Climatic-geographical types

• lowland climate100%SR 38 %

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Susceptibility of soils to acidification

• soils not susceptible to acidification100%SR 27 %

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Soil contamination (map 1:500,000)

• relatively clean soil73%SR 53 %
• uncontaminated soil, the geogenically determined content of some risk elements reaches limit values A27%SR 45 %

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Lithogeochemical types

• Neogene100%SR 48 %

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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.

• LeadPbhigh (top 5 %)
  highest 8.00 μg/lmedian 2.50 μg/l15 samples87 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Chorvátsky kanál2011, 90 m from the water. Comparison: percentile 97 of all samples in Slovakia.

• LithiumLihigh (top 5 %)
  highest 56.0 μg/lmedian 27.0 μg/l14 samples7 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Chotárny kanál2011, 170 m from the water. Comparison: percentile 96 of all samples in Slovakia.

• ArsenicAselevated (top 10 %)
  highest 5.00 μg/lmedian 2.00 μg/l15 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: ODPADOVY KANAL2007, 540 m from the water. Comparison: percentile 92 of all samples in Slovakia.

• CadmiumCdelevated (top 10 %)
  highest 0.400 μg/lmedian 0.150 μg/l15 samples80 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Malý Dunaj, 910 m from the water. Comparison: percentile 91 of all samples in Slovakia.

• BariumBatypical value
  highest 54.0 μg/lmedian 30.0 μg/l13 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Belský kanál2011, 380 m from the water. Comparison: percentile 65 of all samples in Slovakia.

• StrontiumSrtypical value
  highest 246 μg/lmedian 246 μg/l1 sample
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Malý Dunaj1997, 910 m from the water. Comparison: percentile 63 of all samples in Slovakia.

• CopperCutypical value
  highest 1.40 μg/lmedian 1.00 μg/l15 samples93 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Malý Dunaj1997, 910 m from the water. Comparison: percentile 52 of all samples in Slovakia.

• SeleniumSebelow half of Slovakia
  highest 0.500 μg/lmedian 0.500 μg/l14 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Chotárny kanál2011, 150 m from the water. Comparison: percentile 46 of all samples in Slovakia.

• AntimonySbbelow 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: Malý Dunaj1997, 910 m from the water. Comparison: percentile 37 of all samples in Slovakia.

• ChromiumCrbelow half of Slovakia
  highest 1.00 μg/lmedian 1.00 μg/l15 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: ODPADOVY KANAL2007, 540 m from the water. Comparison: percentile 32 of all samples in Slovakia.

Major ions, mineralisation and pH

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

• Silicon dioxideSiO2typical value
  highest 14.5 mg/lmedian 3.76 mg/l14 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: Chotárny kanál2011, 150 m from the water. Comparison: percentile 63 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-HCO342×
• Ca-Mg-HCO3-SO416×
• Ca-HCO313×
• Ca-Mg-SO4-HCO36×
• Ca-SO4-HCO33×
• Mg-Ca-HCO32×
• Mg-Na-SO4-HCO31×
• Mg-Ca-SO41×

Water quality class according to the hydrogeochemical map

• class D30×
• class H17×
• class B15×
• class C11×
• class F5×
• class A4×
• class G2×

Metals in groundwater

• LithiumLiextreme (top 1 %)
  highest 700 μg/lmedian 6.00 μg/l54 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1994, 2.6 km from the water. Comparison: percentile 100 of all samples in Slovakia.

• ChromiumCrextreme (top 1 %)
  highest 130 μg/lmedian 0.375 μg/l54 samples50 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1994, 1.7 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• CopperCuextreme (top 1 %)
  highest 33.5 μg/lmedian 1.15 μg/l54 samples
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1993, 2.5 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• CadmiumCdextreme (top 1 %)
  highest 28.9 μg/lmedian 0.250 μg/l54 samples89 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1993, 860 m from the water. Comparison: percentile 99 of all samples in Slovakia.

• ArsenicAsextreme (top 1 %)
  highest 21.6 μg/lmedian 0.500 μg/l54 samples69 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1993, 1.5 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• AluminiumAlextreme (top 1 %)
  highest 0.270 mg/lmedian 0.00500 mg/l54 samples52 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1993, 2.5 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• ZincZnhigh (top 5 %)
  highest 4,040 μg/lmedian 91.5 μg/l54 samples6 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1994, 2.6 km from the water. Comparison: percentile 99 of all samples in Slovakia.

• LeadPbhigh (top 5 %)
  highest 6.00 μg/lmedian 0.500 μg/l54 samples61 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1994, 2.4 km from the water. Comparison: percentile 97 of all samples in Slovakia.

• SeleniumSehigh (top 5 %)
  highest 4.50 μg/lmedian 0.500 μg/l54 samples93 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1993, 1.5 km from the water. Comparison: percentile 97 of all samples in Slovakia.

• AntimonySbhigh (top 5 %)
  highest 1.00 μg/lmedian 0.100 μg/l54 samples65 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1994, 2.6 km from the water. Comparison: percentile 95 of all samples in Slovakia.

• MercuryHghigh (top 5 %)
  highest 0.200 μg/lmedian 0.100 μg/l54 samples94 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: vrt1993, 860 m from the water. Comparison: percentile 95 of all samples in Slovakia.

• IronFetypical value
  highest 0.00500 mg/lmedian 0.00500 mg/l21 samples100 % below the limit of quantification
  1. up to 50 %
  2. 50–75
  3. 75–90
  4. 90–99
  5. above 99

  Highest value: studňa1993, 3.0 km from the water. Comparison: percentile 50 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.

359 boreholes in the 3 km zone, of which 93 hydrogeological and 266 other; with an archive report number 359.

Borehole depths

• up to 10 m207×
• 10–30 m87×
• 30–100 m54×
• 100–300 m2×
• over 300 m4×

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