Table 1.
Nutrient loads and source contributions for the mass-balance and modelling sources methods at the calculation profile of Oborniki (2017).
| Source: | Mass-Balance method | Modelling method | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| TN load [kgy-1] | % | TP load [kgy-1] | % | Scenario | TN load [kgy-1] | % | TP load [kgy-1] | % | ||
| Municipal point sources | MWS | 132 827 | 4.25 | 21 530 | 34.17 | A1 | 192 898 | 8.8 | 13 411 | 25,9 |
| Municipal diffuse sources | SCS | 234 829 | 7.51 | 496 | 0.79 | |||||
| Industrial point sources | INS | 1 045 | 0.03 | 69 | 0.11 | |||||
| Urban | URB | – | – | – | – | A2 | 54 107 | 2.4 | 2 428 | 4,8 |
| Agriculture | AGS | 2 474 435 | 79.1 | 32 048 | 50.86 | A3 | 1 795 696 | 82.2 | 28 120 | 54,4 |
| Forestry | MFS | 13 800 | 0.44 | 23 | 0.04 | A4 | 53 871 | 2.5 | 844 | 1,6 |
| Natural background | NBS | 57 522 | 1.84 | 7 670 | 12.17 | A5 | 88 595 | 4.1 | 6 899 | 13,3 |
| Atmospheric deposition | ATS | 71 644 | 2.29 | 1 178 | 1.87 | |||||
| Unknown sources | UKS | 141 815 | 4.53 | 0 | 0.00 | – | – | – | – | – |
| SEM | 3 127 916 | 100 | 63 013 | 100 | A0 | 2 185 167 | 100 | 51 701 | 100 | |