Källor i Stockholms län - Inventering och underlag ... - Länsstyrelserna
Källor i Stockholms län - Inventering och underlag ... - Länsstyrelserna
Källor i Stockholms län - Inventering och underlag ... - Länsstyrelserna
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Apart from the springs that were identified in the field survey, there were<br />
about 20 areas in which no springs were found, despite previous reports of<br />
their occurrence. There are a number of explanations for why these springs<br />
had dried up: low groundwater levels at the time of the field survey; other<br />
natural factors; and human activities, e.g. construction.<br />
The chemical analyses showed that human activities that affect groundwater<br />
also have an impact on the outflowing spring water. It is possible to identify<br />
the effects of agriculture, road salt, construction and industries by analysing<br />
the groundwater that flows from springs. In 13 of the 19 springs, the<br />
chemical analyses showed that the water was affected by disturbance in the<br />
drainage area. For instance, a high chloride level (148 mg/L) in a spring<br />
close to a major road in the municipality of Södertälje indicated the impact<br />
of road salt. The effects of animal husbandry and agriculture resulted in<br />
elevated levels of nitrate in several springs on the island of Landsort in the<br />
Baltic Sea and in the municipality of Norrtälje. It should also be possible to<br />
follow up the impact of industrial activities on groundwater, as elevated<br />
levels of cadmium, zinc and lead were found in springs on the island of<br />
Landsort and in the municipality of Botkyrka.<br />
The inventory thus identified a number of coldwater springs that could be<br />
included in a future program to monitor the status of groundwater in<br />
Stockholm County.<br />
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