1. Legal tools and management of water abstraction
London
June 2011
Example of the Beauce aquifer
Thierry Davy

2. Beauce, contexte physique et usages de l’eau
The Beauce aquifer:
Physical context and water uses

3. Efficient rainfalls in France
Beauce masterplan

4. The physical Context in Beauce area
Lessons to learn :
Low rainfalls
Abondant groundwater ressources
Important spatial differencies within te Beau territory

5. France. Irrigated lands in 2000
Région CENTRE
Région ÎLE-DE-FRANCE
Source : AGRESTE – Recensement agricole 2000
Cultures irriguées au moins une fois en 2000 – Superficie (ha)

6. Loire-Brittany basin water abstraction for all uses in 2003 (during the dry season)
Lames d’eau prélevées en 2003 à l’étiage dans le bassin Loire-Bretagne, tous usages confondus, hors retenues collinaires, rapportées aux zones hydrographiques.

7. Water uses Lessons to learn : Important economic impacts
Important Irrigation
Important spatial differences

8. Recharge capacity of the Beauce aquifer
6 years
16 years
1976
2008
1952
1994
1906

9. Minimum biological flows in rivers

10. Good quantitative status?
Lessons to learn:
No irreversible decrease of the aquifer level
Aquatic ecosystems impacted by crisis
Important spatial differencies

11. Management measures iproved
1992 first regulatrory measures
1999 volumetric management
Généralisation of metering
maximum abstraction volume calculated at farm level

12. In 1999 Thresholds on the basis of piezometric monitoring
Water abstraction authorized S1= 450 Mm3, S2=405 Mm3, S3=360 Mm3

13. After 1999 results of models for water abstraction
200 Mm³/an
600 Mm³/an
400 Mm³/an
200 Mm³/an
400 Mm³/an
600 Mm³/an
200 M m³ = sustainable uses

14. 4 management sectors and 4 indicators

15. Level of the Beauce aquifer

16. Authorized abstracted volumes

17. River flows

18. Thanks a lot for your attention