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Anthropogenic activities disrupt hydrological regime (e.g. lake water level, river flow), and water quality changes due to pollution and affect ecosystems by disrupting the cycles of substances and water cycle. The composition of natural surface waters can be altered for a many reasons, for instance climatic, geographic as well as anthropogenic. Agriculture depends on a use of fertilizers, a use of pesticides, and a transport which turn agricultural land into a nonpoint source of surface water pollution. The agglo...

As a result of increasing concentrations of total nitrogen and total phosphorus, surface water chemical pollution and eutrophication is a problem of raising concern worldwide. Chemical quality of surface water gives an impression about different geochemical, geological, hydrological and biological processes, as well as intensity of anthropogenic load in river catchment area. The total length of Svete River is 123 kilometres, of which 75 kilometres are in the territory of Latvia. Main part of river?s drainage basin...