1. Priority Substances Emissions Inventory
Data Sources
What is readily available
What issues arise

2. Data Availability – E-PRTR

3. E-PRTR – Issues Arising
Reporting only above thresholds, e.g. > 100,000 population equivalent with respect to municipal wastewater discharges
Smaller emissions will be important
All PS captured in the E-PRTR Regulation?
Wastewater discharges are not a true source; Chemicals from domestic sources, industry, transport, atmospheric deposition (but original source?) are discharged in treated effluent.

4. Other Sources
UWWTD – limited data provided voluntarily on discharge of pollutant (primarily nutrients though)
Eurostat/OECD JQ – wastewater discharges at a national scale
EEA new reporting stream on emissions – RBD scale, regular updating. A data dictionary has been established that could be of value.
Some limited chemicals data reported thus far……

6. Sea Conventions; OSPAR and HELCOM
Inputs of cadmium in tons to the maritime area of the OSPAR convention
Coastal loads – raise issues related to
harmonisation of methods

7. Other Sources – Research/Modelling Programmes e. g
Other Sources – Research/Modelling Programmes e.g. ScorePP, SOCOPSE, Moneris, FOOTPRINT etc Acceptability?

8. Priority Substances Emissions Inventory
(Some) Methods
Issues Arising

9. Riverine Loads
OSPAR (and others) guidelines regarding load estimation at/close to river mouth.
Provided point discharges are quantified, the difference between net load and points can be attributed to a lumped diffuse source
Advantage – flow and concentration data typically available, but some issues….

10. Riverine Loads
Chemical loads as quantified ‘in-river’ - near to tidal limit - account for in-river processing (sedimentation, remobilisation etc)
Net loads can be very different from those releases ‘immediately’ at source
Standard approaches/coefficients for estimating this loss?

11. Riverine Loads No quantification of load by sector
Loads aggregated to a single figure, i.e. lumped total load or lumped diffuse
Strongly influenced by rainfall, river flow
Inter-annual variation suggests that some record of hydrology is needed – mean annual flow?, annual rainfall?

12. Methods – Harmonisation Issues
Diffuse emissions (agriculture, urban) also strongly influenced by hydrology
Accurate load assessment means high frequency sampling is needed to capture storm events; a few events deliver much of the load.
Variety of models/predictive tools used – vary nationally and across RBD’s
Make use of ‘libraries’ of coefficients e.g. export coefficients
Consistency in method within a country/RBD is important.

13. Wastewater
Wastewater discharges are not a true source; Chemicals from domestic sources, industry, transport, atmospheric deposition (but original source?) are discharged in treated effluent.
Ideally, in order to best target measures, these separate sources should be quantified, but…..

14. How to deal with complexity in Urban Environment ?
True Diffuse losses (EMC X Runoff Volume)
Collected, Not Treated
Collected, Treated
Storm Overflows
Focus on the initial source and release ? (e.g. coefficients for metal loss from tyres, brakes)…but the inventory requires ‘losses’

15. Make good use of existing guidance
Use established sources, pathways and methods to provide clarity with terminology, common formats, units etc.
National approaches
IMPRESS
OSPAR – HARP-Haz
Eurostat/OECD JQ