2. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

3. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

4. Dordogne and its principal tributaries
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Dordogne and its principal tributaries
L’isle
La Vézère
La Cère
La Dordogne

5. Geological map of the Dordogne basin
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Geological map of the Dordogne basin
Quaternar alluvial
Volcanic rock
Sand, clay and gravel
Karstic limestone
Crystalline rock

6. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

7. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

8. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

9. Population density Water quality and eutrophisation Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Population density

10. Industrial waste Water quality and eutrophisation Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Industrial waste

11. Agricultural aspects Water quality and eutrophisation Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Agricultural aspects

12. IRRIGATION Water quality and eutrophisation Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
IRRIGATION

13. 61% water bodies (principal and very small) in good condition by 2015
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Inventory Water Framework Directive
61% water bodies (principal and very small) in good condition by 2015

14. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

15. Pressures stemming from agricultural pesticides
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Pressures stemming from agricultural pesticides

16. Zones susceptible to eutrophication
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Zones susceptible to eutrophication

17. Risk of degeneration trough coliform bacteria
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Risk of degeneration trough coliform bacteria

18. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

19. What strategies does EPIDOR apply to improve water quality ?
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
What strategies does EPIDOR apply to improve water quality ?
Collecting data: evaluations of water quality, audit on sanitation, study of aquatic leisure frequentation, studying eutrophication of the rivers, diagnostics watershed upstream of lakes, …
Setting priorities and programs of action with animation territorial (contracts river) or thematic

20. domestic sanitation Results: :
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
domestic sanitation
Working with departments (counties) and the Water Agency to improve the equipment
Results: :
44% of communes have a collective sanitation system (the same rate French)
better account of bathing usage on the sections most frequented by effacing of wastes in summer (infiltration) or appropriate treatment (lagoon finishing, UV, ...) for all the recent STEP
Still to do :
Equip communes with fewer than 500 inhabitants
Improve the functioning of collective sanitation system above all in rainy periods

22. Limiting agricultural pollution
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Limiting agricultural pollution
Specific actions within the compass of the river contracts: effluents from cheese production in the Upper Dordogne, studies currently in progress on the treatment of effluents from wine production in the Lower Dordogne, participation in the drafting of local plans
Results :
Launching of a programme of works with financial incentives (from the region, Europe, Water Agency) for the cheese producers
Still to do :
To achieve a clear diagnosis and a strategy for action at the level of the entire river basin

23. Eutrophication and the cyanobacteria
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Eutrophication and the cyanobacteria
Study of the eutrophication of the Borte les Orgues and Saint- Etienne-Cantalès reservoirs
Identification of bodies of water affected by cyanobacteria
Helping local bodies with diagnostic studies relating to the sources feeding their stretches of water bodies
Studying the development of cyanobacteria in the Bort les Orgues reservoir

24. Eutrophication and the cyanobacteria
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Eutrophication and the cyanobacteria
Results :
Mapping of the waters affected
Diagnostic studies of the the main bodies of water impacted are now completed and the established facts are similar for each of them, as are the proposed programmes for action
The Bort study shows :
Little development attributable to the partial lowering of the dam in 2005
Decreasing gradient of eutrophication from upstream to downstream
Different species upstream and downstream of the reservoir
Influence of the winds on the structuration proposal
The influence of thermic stratification for an alarm system

25. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

26. Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne

27. Eutrophication and the cyanobacteria
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Eutrophication and the cyanobacteria
Limitations :
No feedback of the experience gained from establishing the action programmes nor of their efficacity. Reasons :
Studies effected too recently
Heavy financial costs
Difficult for local bodies to invest in actions taken for the basin overall

28. Water quality issues Continuation of sanitation equipment
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Water quality issues
Continuation of sanitation equipment
Improving the reliability of existing installations and taking better account of bathing usage
Evaluation of the contamination by emergent polluants and toxic products
Reducing the diffuse pollution from agriculture

29. Merci de votre attention
Water quality and eutrophisation
Nathalie BARDIN
Établissement Public Territorial du Bassin de la Dordogne
Merci de votre attention