Cost-Benefit Analysis in a Framework of Stakeholder Involvement and Integrated Coastal Zone Modeling

Active involvement of local stakeholders is currently an increasingly important requirement in European environmental regulations such as the EU Water Framework Directive (WFD) and the EU Marine Strategy Framework Directive (MSFD). The same is true for economic analyses such as cost-benefit analysis (CBA). For example, the Swedish WFD implementation requires i) quantification of cost and benefits of proposed measures and ii) stakeholder involvement. How can these two requirements be integrated in practice? And can such requirements facilitate implementation of projects with a potential net benefit? This paper presents a stepwise CBA procedure with participatory elements and applies it for evaluating nutrient management options for reducing eutrophication effects in the coastal area of Himmerfjarden SW of Stockholm, Sweden. The CBA indicates a positive net benefit for a combination of options involving increased nitrogen removal at a major sewage treatment plant, creation of new wetlands and connecting a proportion of private sewers to sewage treatment plants. The procedure also illustrates how the interdisciplinary development of a coupled ecological-economic simulation model can be used as a tool for facilitating the involvement of stakeholders in a CBA.