Fig. 2

Concentration of total phosphorus in Orla River in years 2004–2018—as simulated by SWAT. The times of modernization of Krotoszyn and Rawicz WWTPs are depicted with vertical lines
Concentration of total phosphorus in Orla River in years 2004–2018—as simulated by SWAT. The times of modernization of Krotoszyn and Rawicz WWTPs are depicted with vertical lines