Hydrogeological overview map of Lower Saxony 1: 500000 – Groundwater condition: Nitrate content
Description
The hydrogeological overview map of Lower Saxony 1: 500000 – Groundwater condition: Nitrate content shows the evaluation of a representative selection of nitrate concentrations from the LBEG laboratory database. The data collected over a period from 1980 to 2005 were twice averaged. At groundwater measuring points with multiple analyses, averages of the respective available test results were formed. In addition, the values of all sampling points within a radius of 2 000 m were subjected to further averaging.
The bar diagrams show the analytical data available in the laboratory database of the LBEG depending on the depth and concentration. In the depth level above 100 m there are generally no nitrate values in the laboratory database. A representation is therefore not possible in this field.
The classification of the classes takes into account the limit value of the Drinking Water Ordinance (TVO) of 50 mg/l. The nitrate contents are shown in depth levels without reference to the local hydrogeological situation. A comparison of values is therefore not permissible without taking into account the respective hydrogeological situation (e.g. hydrogeological floor construction) as well as the use of the values in the overview map in scale 1: 500.000 averages shown for detailed investigations.
Predominantly geogenous nitrate levels rarely exceed 1 – 10 mg/l in loose and solid rock areas in oxygen-containing groundwater (e.g. Gorleben fir trees approx. 1 mg/l, Solling approx. 7 – 8 mg/l, western resin approx. 10 mg/l). These are often composed of a geogenous base content and a diffuse anthropogenic entry from the atmosphere.
In deeper areas of the looser rock aquifers, the groundwater is predominantly nitrate-free, reflecting the long residence times of this groundwater and the favourable conditions for nitrate mining (org. Substance, Fe (II), sulphides) is due to quaternary rocks.
Mainly through agricultural nitrogen fertilisation, nitrate concentrations of up to 350 mg/l can be achieved. In areas with high nitrate concentrations, there are usually high potassium levels.
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https://nibis.lbeg.de/net3/public/ogc.ashx?NodeId=645&Service=WMS&Request=GetCapabilities& |