1. Priority Substances Inventory Guidance a step towards international harmonization Joost van den Roovaart

2. Outline presentation Why emission inventories, why a Guidance document? Usefull items from past and present Steps to harmonization Some questions for discussion

3. Why emission inventories? We have water quality problems Emissions are a key factor in that problem If we want to solve our problems, we have to know: what is the contribution of the sources to the WQ problem? what are possible measures? what is the effect of the measures (and the costs) Focus on the first point

4. WFD steps define area/watersystem define water quality problem inventory of sources selection of substance selection of sources selection of measures, based on (cost) effectiveness inventory possible measures implementation of measures

5. WFD: analyses of emission sources surface water

6. Use of emission data Ntotal (kton)

7. Use of emission data copper lead

8. Use of emission data WFD River Basin Management Plan Rhine Relative discharges of problem substance for main sources

9. International catchment: Rhine zinc copper Ntotal

10. Why an Guidance Document? It seems to be a difficult job A lot of substances, sources, pathways, approaches, estimation methods, differences between countries A lot of information gathered, project results are available, actions carried out, but: Not always succesfull, just rather small steps forward Assist the Member States

11. Why an Guidance Document? We want to compare the data: EU-wide, within River Basin We need transparancy If is is possible: harmonization Second reason for this action

12. Some usefull experiences? 4th NSMC ICBR EU PS documents Dutch PRTR

13. 4th NSMC 1998-2000, HARP project: Harmonised Quantification and Reporting Systems for nutriënts and hazardous substances: HARP-NUT and HARP-HAZ Documents, reporting formats, digital reporting system Just a few countries made use of it: too complex, too early? Usefull: General Overview, Source- vs Load oriëntated approach

14. ICBR 1997-2000, Inventory of (some) Priority Substances River Basin wide harmonised inventory, methods for estimation of diffuse sources of heavy metals and lindane Took some years, nice methods, good match with WQ Not adopted by the Member States: each MS preferred own methods Usefull: Source schedule, methods

15. EU 2003, Emissions, discharges and losses for priority substances in the field of water policy – source identification and proposals for measures, Haskoning Inventory for all PS, Main Schedule, Factsheets per substance including entry routes Lots of information, info about measures difficult Is it used? Usefull: inventory, main routes per substance

16. Dutch PRTR since 1974 national emissions to air, water and soil of 350 pollutants yearly update of dataset (t-2/t-1) cooperation about 70 experts of 10 institutes time series (>1990) national and regional data data accessible from internet (www.prtr.nl) methods documented in factsheets one system for (inter)national reports

18. Emission Register

31. Determination of pathways Industry Refineries Energysector Traffic and Transport Consumers Construction Waste disposal Trade, services and government Agriculture Nature Surface waters air agricultural and natural soils Sewers UWWTP discharge to air discharge to soil load to sewers discharged load Deposition on surface waters Run-off and leaching Untreated sewage Rainwater drains Stormwater overflows Effluents transboundary Upstream loads

32. Estimation methods  different sources, different methods  combination of models and measurements  depending on data and knowledge availability Basic method: emission factor * statistic variable = discharge load Example: - Yearly loss of 2 kg copper per ship due to use of antifouling - 5000 ships 2 * 5000 = 10.000 kg copper  Reality is more complex

33. Spatial distribution each diffuse source has a spatial distribution the national totals are allocated geographical coverage: water boards or WFD river basins. Example: Intensity of road use by passenger cars on national and regional roads in 2004.

34. Factsheets For each source a factsheet documents: description of source; estimation methods; data used: emission factors and activity data; time series of emissions (yearly update); spatial distribution; reliability in five categories. Available on the internet and in English! www.prtr.nl

35. Dutch PRTR 35 year of work and money, expensive Based on a lot of information and statistical data Not to copy to other MS Usefull: main schedule, methods, factsheets, spatial distribution

36. Possible steps for international harmonization 1.Exchange of information (models and data used) 2.Harmonization of definitions (pathways, substances, time and spatial scales) 3.Exchange and comparison of methods and models

37. Questions focus on emission inventory or more (WQ processes, measures)? >focus different approaches or one approach? >try to make one schedule for all sources and substances just describing methods or also harmonising of methods? >harmonising is the next step