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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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