1. R E 1 Some Experiences with Data and Models in International (Water) Assessments Ton Bresser National Institute of Public Health and Environment Frans van de Ven Institute for Inland Watermanagement and Waste Water Treatment

2. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 2 A few examples of international reports where water assessments have been incorporated (with involvement of RIVM): Environment in the European Union, EEA, 1995 UNEP, Global Environment Outlook 1, 2, 2000 Economic Assessment of Priorities for a European Environmental Policy Plan

3. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 3 Environment in the European Union, EEA, 1995 purpose: review of the 5th Environmental Action Programme domain: water as part of the environment area: EU-12 some instruments (mainly data) Figure 3.2.4: Development of organic matter, phosphorous and nitrate concentration in EU12 rivers Source: ETC/IW, 1995 Map 3.2.2: The pesticides 'hot spots' for groundwater Source: RIVM (1995)

4. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 4 Environment in the European Union, EEA, 1995: some findings for water assessment mainly data (state of the environment), little analysis of cause-effect (for water) prospective part: mainly qualitative; strengthening of tools necessary hardly any use of mathematical models choice of indicators based on availability of data, not on analysis of main issues of importance for end-points (i.e. health of people and ecosystems) sketchy

5. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 5 purpose: assess emerging problems and issues / re-assess; secundary: connection between problems? policy results? domain: water as part of the environment area: world but regionally differentiated some instruments (models; integrated): UNEP, Global Environment Outlook 1, 2, 2000

6. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 6 UNEP, Global Environment Outlook 1, 2, 2000: some findings for water assessment mainly models, hardly any data-analysis: need for datacentre(s) only issues incorporated for which models are available; incomplete picture: co-ordinated effort needed validation is serious issue with integrated modelling downscaling to Europe not always possible with enough detail to deal with European issues: regional approach connection with action programme(s) difficult but necessary process / networking collaborating centres at least as important as reports

7. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 7 Economic Assessment of Priorities for a European Environmental Policy Plan purpose: assess persistent problems and issues domain: water as part of the environment area:pan-Europe some instruments (models, data analysis, linked):

8. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 8 Carmen as example of modelling approach Agriculture Atmospheric transport Waste water Population density N-input on land Direct runoff Treatment Crop uptake - denitr. Excess-N Ground water Surface water Coastal zones Landuse Industry, traffic, etc impact transport losses distribution input Model structure

9. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 9 Carmen as example of modelling approach Agriculture Atmospheric transport Waste water Population density N-input on land Direct runoff Treatment Crop uptake - denitr. Excess-N Ground water Surface water Coastal zones Landuse Industry, traffic, etc impact transport losses distribution input hydrogeological data as basis GIS-based approach to translate national statistics to catchments transformation of emissions to river loads statistical techniques inventory of point and non-point sources surface and ground water flow (N); P only surface calibrated for loss terms N and P comparison calculated / measured at river mouths

10. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 10 Economic Assessment of Priorities for a European Environmental Policy Plan: some findings for water assessment enough detail to address European issues concentrated on persistent problems; no state of environment relation between environmental issues not fully analysed consistent scenarioes as starting point in analysis: valuable tool data-availability much improved

11. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 11 General recommandations: combination of data-analysis and modelling; synthesis is important part in analysis integration (in models) needs attention: integration at water system level or integration along DPSIR ? consistent scenarioes necessary; attention: scenarioes for water management or scenarioes for economic and demographic development ? until now, hardly any public or stakeholder involvement: clean scientific analysis; does not fit into WFD; other tools needed

12. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 12 End of presentation; following sheets: details

13. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 13 Figure 3.2.4: Development of organic matter, phosphorous and nitrate concentration in EU12 rivers Source: ETC/IW, 1995

14. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 14 Map 3.2.2: The pesticides 'hot spots' for groundwater Source: RIVM (1995)

15. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 15

16. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 16

17. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 17 example of results from CARMEN (CAuse effect Relation Model for the ENvironment

18. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 18

19. Some Experiences with Data and Models in Intenational (Water) Assessments | Ton Bresser r 19