|
Source of Nitrogen |
Reference Scenario |
“Most Likely”
Scenario |
“Pipeline” Scenario |
| |
|
Himmerfjärden Sewage Treatment Plant, effluent nitrogen concentration |
10 mg/L |
4 mg/L |
4 mg/L plus offshore outfall |
|
Agriculture |
No additional measures |
Wetland creation (25 ha) |
Wetland creation (25 ha) |
|
Private sewers connected to sewage treatment plant |
0% (no additional measures) |
25% |
25% |
|
Mean summer Secchi depth |
3.1 m |
3.7 m |
4.1 m |
|
Secchi depth change |
- |
0.6 m |
1 m |
|
Benefits of Secchi depth improvement (summed present values) |
- |
309 MSEK |
516 MSEK |
|
Costs of scenario (summed present costs) |
- |
133 MSEK |
539 MSEK |
|
Net benefit |
- |
176 MSEK |
- 23 MSEK |