1. What to do when valuation of ecosystem services fails Frank J. Dietz 29 september 2011

2. Content Effects on nature in complex decisions Nature effects in cost-benefit analyses Making nature effects manageable in CBAs

3. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 3 Complex decisions

4. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 4 Complex decisions

5. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 5 The importance of aggregation of information  Overload of information on dose-response relations  The need for aggregation and standardisation  Cost-benefit analysis

6. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 6 Nature effects in CBAs  PM entry  Benefit transfers  Scores on an ordinal scale

7. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 7 Making nature effects manageable in CBAs Species Weighted Nature Value Indicator depends on:  Quality of the ecosystem  Area that the ecosystem covers  Weighting factor related to rarity of (endangered) species NVI = Quality x Area x Weighting Factor

8. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 8 Application of nature points in CBA Waterdunen Net costs Nature improvement Variant 116,4P.M. Variant 226,9P.M. Variant 314,4P.M.

9. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 9 Application of nature points in CBA Waterdunen Net costs Nature Improvement (nature points) Variant 116,4180 Variant 226,9450 Variant 314,4180

10. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 10 Application of nature points in CBA Waterdunen Net costs Nature Improvement (nature points) Nature points per mln euro’s Variant 116,418011.0 Variant 226,945016.7 Variant 314,418012.5

11. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 11 Conclusions  Nature points does not solve the valuation problem …  … but it improves insight into trade-offs between changes to nature (points) and effects in euro’s  Improved measurement of nature effects could increase the usefulness of CBA as supporting instrument in the decision- making process Thanks for your attention !

12. What to do when valuation of ecosystem services fails Frank J. Dietz 29 september 2011

13. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 13 Case: Closure Dam (Netherlands) Built in 1930’s Aim: safety 2010: Revision necessary Aim: to guarantee safety for decades to come Ambition: enhancing nature value (WFD, MSFD)

14. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 14 Case: Closure Dam (Netherlands) Closure Dam

15. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 15 Case: Closure Dam (Netherlands) IJssel Lake (freshwater) Wadden Sea (salt water, intertidal) Closure Dam

16. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 16 Salt marshes Salinity Gradient & Fish Migration One-sided Nature Development Case: Closure Dam (Netherlands)

17. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 17 Salt marshes Brackish water zone Salinity Gradient & Fish migration Salinity Gradient & Fish Migration Riparian zone Case: Closure Dam (Netherlands) Two-sided Nature Development

18. Frank J. Dietz - Water Science Meets Policy - 29 Sept 2011 18 Cost effectiveness of measures for the improvment of nature Total Costs (10 6 €) Nature Value Index (NVI) Cost effectiveness (NVI / 10 6 €) Safety only160000 Nature development in IJssel Lake +790+30003.8 Nature development in Wadden Sea +165+ 330020 Fish passage only+10+1500150