1. at Umweltbundesamt GmbH Wien
WFD-GW trend
The EU Water Framework Directive: Statistical aspects of the identification of groundwater pollution trends, and aggregation of monitoring results
1st Workshop
at Umweltbundesamt GmbH Wien
3/4 April 2000

2. 1st Workshop 3/4 April 2000 Project Title Financed by:
The EU Water Framework Directive: Statistical aspects of the identification of groundwater pollution trends, and aggregation of monitoring results
Financed by:
Federal Ministry of Agriculture, Forestry, Environment and Water Management
European Commission, DG Environment
in kind contributions by partner countries
Project coordination
Federal Environment Agency ltd. - Austria

3. Partners involved Federal Environment Agency, Austria
AMINAL, Belgium
GEUS, Denmark
Agence de l ’eau Artois Picardie, France
Hessisches Ministerium für Umwelt, Landwirtschaft und Forsten, Germany
Institute of Geology and Mineral Exploitation, Greece
Ireland?
RIVM-Nat. Institute for Public Health and the Environment, The Netherlands
INAG, Portugal
Ministerio de Medio Ambiente, Direccion General de Obras Hydraulicas y Calidad de las Aguas, Spain
Environment Agency (England and Wales), United Kingdom
quo data, Germany (Subcontractor)

4. Trend assessment (A. V, 2.4.4) Identification of trends in pollutants
long-term anthropogenically induced upward trends and trend reversal
base year or period from which trend identification is to be calculated
calculation of trends for a body or group of bodies of groundwater
statistical demonstration of trend reversal and level of confidence

5. Chemical status (1) (A. V, 2.4.5)
Interpretation and presentation of groundwater chemical status (WFD - common position)
aggregation of results of individual monitoring points for the GW-body as a whole
the mean value of the results of monitoring at each point in the groundwater body or group of bodies shall be calculated; and
the mean value of these calculations for all monitoring points in the groundwater body or group of bodies shall demonstrate compliance with those standards in the manner prescribed in the relevant Directive.
--> 2nd reading:

6. Chemical status (2) (A. V, 2.4.5)
Interpretation and presentation of groundwater chemical status (WFD - 2nd reading)
aggregation of results of individual monitoring points for the GW-body as a whole
the mean value of the results of monitoring at each representative monitoring point in the groundwater body or group of bodies shall be calculated; and
these calculations shall be the basis for the bodies of water concerned, the environmental quality standards are considered to be complied with when 70% of these mean values are in accordance with the values laid down in the Directive (91/676/EEC, 97/57/EC and 98/83/EC)
--> compromise text - suggestions

7. Chemical status (3) (A. V, 2.4.5)
Interpretation and presentation of groundwater chemical status (WFD - compromise text suggestions)
aggregation of individual monitoring points for the GW-body as a whole
the mean value of the results of monitoring at each representative monitoring point in the groundwater body or group of bodies shall be calculated; and
in order to demonstrate compliance, a total of 70% of those mean values shall comply with with the standards laid down for groundwater in the manner prescribed in the relevant Directives, such as Directives 97/57/EC and 98/8/EC.

8. GW-body characterisation (Annex II)
Maps (location, boundaries)
General description
name, region, ...
Meteorology
precipitation, air temperature, ...
Hydrogeology
top soil, upper confining layers, aquifer
thickness, petrography, stratigraphy, hydraulic conductivity, recharge situation, ...
Pressures
land use, abstraction and recharge, diffuse and point pollution sources, ...

9. GW-monitoring (1) (A. V, 2.4) monitoring network (2.4.1)
to provide a coherent and comprehensive overview of groundwater chemical status
to detect anthropogenically induced upward trends
Surveillance monitoring (2.4.2)
supplement and validate the impact assessment procedure
assessment of trends (natural or anthropogenic)
Operational monitoring (2.4.3)
chemical status of all GW-bodies being at risk
assessment of trends (anthropogenic)

10. GW monitoring (2) (A. V, 2.4.2) selection of parameter
oxygen content, pH value, conductivity, nitrate, ammonium
parameters which are indicative of the impact of pressures
Transboundary water bodies: parameters which are relevant for the protection of all of the uses supported by the groundwater flow.
minimum monitoring frequency
once per annum

11. Chemical status Questions to be dealt with:
distribution of sampling sites, area of GW-body, type of sampling site, ...
seasonal variation? Impacts on mean?
minimum sampling frequency? (in relation to parameter)
values below the detection limit?
effects of data aggregation (time, area)
....

12. Trend assessment Questions to be dealt with:
minimum length for time series?
minimum sampling frequency?
saisonal variations - effects on trend calculation?
values below the detection limit?
confidence range for trend calculations?
trend reversal assessment, confidence range?
trend caused by point source of pollution within the GW-body?
....

13. Input UBA and quo data project coordination
database development and management
analysis of the data
statistical calculations
elaboration of an algorithm
trend assessment and trend reversal
assessment of chemical status
web-site development for information exchange
reporting
web-site development for presentation of results

14. Input Partner
Detailed information on 2-3 GW-bodies (hydrogeologic conditions, pressures,....)
background information on the monitoring network design (objectives, sampling sites/density/type ...)
GW-quality data (el. conductivity, nitrate, ....)
applied statistical methodologies
comments and discussion of results

15. Outcome Description of GW-bodies subject to the study
Description of monitoring strategies
Selected parameters
Analysis of statistical methods in MS
Algorithm for trend assessment, trend reversal and the assessment of chemical status
Findings and conclusions
Presentation of results (report, web-site)