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

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Presentation on theme: "Nathalie BARDIN Établissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation."— Presentation transcript:

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

3 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

4 La Cère La Vézère Lisle La Dordogne Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation Dordogne and its principal tributaries

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

6 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

7 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

8 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

9 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation Population density

10 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation Industrial waste

11 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation Agricultural aspects

12 IRRIGATION Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

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

14 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

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

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

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

18 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

19 What strategies does EPIDOR apply to improve water quality ? 1.Collecting data: evaluations of water quality, audit on sanitation, study of aquatic leisure frequentation, studying eutrophication of the rivers, diagnostics watershed upstream of lakes, … 2.Setting priorities and programs of action with animation territorial (contracts river) or thematic Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

20 domestic sanitation 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 Working with departments (counties) and the Water Agency to improve the equipment Still to do : Equip communes with fewer than 500 inhabitants Improve the functioning of collective sanitation system above all in rainy periods Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

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22 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 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

23 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 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

24 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 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

25 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

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

27 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 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

28 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 Nathalie BARDINÉtablissement Public Territorial du Bassin de la Dordogne Water quality and eutrophisation

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


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