6 Quality Assessment of Water Resources of River in Poland
133
Fig. 6.5 Spatial diversity of average total nitrogen (mgN/L) in Polish river catchments and subcatchments in 2010–2015 (own elaboration based on data from Voivodeship Inspectorates for Environmental Protection). Explanations: catchments and subcatchments numbered as in Tables 6.2, 6.3,
and 6.4
6.3.2 The Extent of Water Pollution in Polish River
Catchments, by Region
Polish rivers are very diverse in terms of mineral, organic, and biogenic pollution.
This is determined by the diversity of Poland’s natural conditions and the varying
intensity of anthropogenic pressure in different regions. Based on analysis of the
degree of river pollution based on six quality characteristics (SEC, Total hardness,
BOD 5 , TOC, TN and TP), Polish river catchments and subcatchments were indexed.
Ten classes were established for each indicator. The thresholds for these classes were
established at every 10
th fractal. Each class was assigned from 1 to 10 points. Based
on the average score, five classes were then distinguished (every 2 points), and then
assigned the following river pollution grades: Class I—very low; class II—low; class
III—moderate; class IV—moderately high; class V—high.
133
Fig. 6.5 Spatial diversity of average total nitrogen (mgN/L) in Polish river catchments and subcatchments in 2010–2015 (own elaboration based on data from Voivodeship Inspectorates for Environmental Protection). Explanations: catchments and subcatchments numbered as in Tables 6.2, 6.3,
and 6.4
6.3.2 The Extent of Water Pollution in Polish River
Catchments, by Region
Polish rivers are very diverse in terms of mineral, organic, and biogenic pollution.
This is determined by the diversity of Poland’s natural conditions and the varying
intensity of anthropogenic pressure in different regions. Based on analysis of the
degree of river pollution based on six quality characteristics (SEC, Total hardness,
BOD 5 , TOC, TN and TP), Polish river catchments and subcatchments were indexed.
Ten classes were established for each indicator. The thresholds for these classes were
established at every 10
th fractal. Each class was assigned from 1 to 10 points. Based
on the average score, five classes were then distinguished (every 2 points), and then
assigned the following river pollution grades: Class I—very low; class II—low; class
III—moderate; class IV—moderately high; class V—high.