Table 1. Policy options for the simulation model (including policy options for the reference scenario).

Human activities
Himmerfjärden Sewage Treatment Plant Agriculture Private sewers
Policy options for the Himmerfjärden Sewage Treatment Plant: effluent nitrogen concentration and other possible measures Policy options for agriculture: wetland creation or catch crop cultivation Policy options for private sewers: share of private sewers connected to the sewage treatment plant
10 mg/L (reference scenario) No additional measures undertaken (reference scenario) 0% (reference scenario)
4 mg/L Catch crops – low estimation 25%
4 mg/L plus move outfall to the open Baltic Sea by building a pipeline Catch crops – high estimation 50%
Wetland creation (area calculated by the participation function, based on level of support for wetland creation) 100%