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Anthropogenic eutrophication is the main ecological problem of the Baltic Sea. However, there are many rivers entering the sea without monitoring points. The paper presents methodology for evaluation of the total phosphorus and nitrogen discharges outflow unit discharges from catchment areas of such rivers. As example, we consider Russian part of the Finnish Gulf catchment area. The first stage of the methodology consists in determination of partial catchment areas of rivers with water runoff and the biogenic elem...