Evaluation of surface waters quality in Nidzica agricultural catchment area

Nowadays, human activity has been playing an increasing role in determining the quality of surface waters. The aim of the following article is to show an influence of anthropogenic factors influencing the variability of chemical composition of river waters in a catchment area with an agricultural use of lands. The authors carried out the analysis of surface waters quality, made an inventory of pollution sources of surface waters and presented the proposal of quality improvement of surface waters in the Miechów and Kazimierz districts. Research on the concentration of biogenic compounds was conducted in the Nidzica catchment area. Data for research was obtained from the Voivodship Inspectorate for Environmental Protection, County Offices and Commune Offices. The tested area was an agricultural one. The major pollutants of the waters of catchment areas include both area and point pollution. Fertilizers and natural fertilizers are used to raise the yield and then they get into the surface waters by flushing from the fields. The main goal is to investigate the dynamics of changes in the content of nutrient compounds in surface waters during the year (seasonal changes) and in the multiannual period (multiannual changes)