Results of research, carried out in 2001-2002, on hydrochemistry of River Gowienica are presented. The Gowienica drainage is situated in the western part of the District of Western Pomerania. Thermal and oxygen regimes were studied, as were the organic matter load (BOD₅, COD_Cr) and nutrient (NH₄⁺, NO₃^-, NO₂^-, organic N, total N, reactive P, total P) contents. The oxygen content was found to range within 4.4-14.6 mgO2·dm^-3, while the ranges of BOD₅ and COD_Cr were 0.6-5.5 and 12.2-47.4 mgO₂·dm^-3, respectively. Mean contents (mg N·dm-3): of nitrogen compounds amounted to 0.180 for ammonia nitrogen, 0.032 for nitrite nitrogen, 0.239 for nitrate nitrogen, 0.283 for organic nitrogen, and 0.740 for total nitrogen. Mean contents of reactive and total phosphorus were 0.186 and 0.293 mg P·dm^-3, respectively. The study showed the organic matter load and nutrient contents to increase downstream, from the river’s origins to its mouth. Statistical analyses demonstrated the organic matter load and nutrient content to be directly correlated with temperature and to be inversely correlated with the oxygen content. A direct relationship between total nitrogen and phosphorus contents on the one hand and the organic matter load on the other was revealed as well.

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