1. Planned risk assessment in Sweden

2. Present activities Collecting abstraction points
location, amount, administrative information
Use of web interface for data retrieval, (97 % of the municipality are registered)
Mostly located in glacio-fluvial deposits
numerous minor water supply in Precambrian bedrock or glacial till

3. Groundwater in Sweden

4. Delineation
Groundwater bodies and re-charge area mostly delineated without field investigation
soil maps, hydrogeological maps (scale 1: : )
topographic maps (grid 50 m; accuracy m, equidistant 5 m )
All collected water wells must belong to a delineated groundwater body with re-charge area
Simplified method for delineation of recharge area in Precambrian bedrock

5. Risk assessment of small water supplies in Precambrian bedrock
Important factors when deciding influence radius:
topography
direction of fractures,
depth of well,
abstraction rate
But: lack of data, numerous water
supplies, short time span
Inventory of risks 200 m from every abstraction point

6. Risk assessment
Water authorities (not yet appointed) responsible for inventory of pollutant sources, but the counties will do the inventory
Geological Survey of Sweden and SEPA responsible for national guidance
Guidance under construction (jun 04)
Guidance as a website
Target group: employees of water authorities, politicians, teachers in elementary school

7. Impact assessment Focus on identification of impact where:
data is available for status and impact
impact is assumed to be significant
probabilities are greatest that impact will be the reason for failure of achieving the national environmental quality objectives

8. Available data for risk assessment
Emission data in a national database
Some larger waste deposits have monitoring programs
Contaminated soil ( locations are identified)
Abstraction points in a national database
National monitoring data
130 locations
time series average: 17 y, maximum 36 y.

9. Water manager’s experienced problems n=918 (oct. 2003)
Roads %
Agriculture 48 %
Urban areas 40 %
Forestry %
Surface water 11 %
Industries %
Waste deposits %
Air pollution %
Others %

10. National guidance
Guidance has checklists on what must be checked during 2004
Every subset will be classified in 3 classes
Insignificant influence on groundwater body
Uncertain influence on groundwater body
Probable significant influence on groundwater body
Expert judgement where characteristics of the overlaying strata in the catchment area is included

11. National guidance

12. Identify impacts Assessment of impacts
Gw-bodies with no data is
considered as uncertain
influence and will be
investigated before
RMP 2009
Identify impacts
Gw-bodies with good
status is considered as
insignificant influence
Gw-bodies with no risk is
considered as
insignificant influence
Gw-bodies which will be
classified as not being of good
status or impacts has been identified
Gw-bodies with no data is
considered as uncertain
influence and will be
investigated before
RMP 2009
Assessment of impacts
Gw-bodies classified as not being of good status or
where the identified impact is estimated as significant is
considered as probable significant influence
uncertain
influence
probable significant influence
insignificant influence
Investigation
Operational monitoring
and measures
Surveillance
monitoring

13. Thank you for your attention