1. Drinking water supply on Langeoog - situation and problems Holger Hinnah OOWV - The water board of Oldenburg and East Frisia

2. The OOWV institution with legal standing founded in 1948 as a water and soil board since 1999: new department sewage disposal

3. OOWV- Area

4. The OOWV in figures general company year of foundation1948 clients ca. 1 Mill. employees651 thereof trainee30 total assets (drinking water and sewage) ca. 500 Mill. EUR Stand:1/2004 2 area 7.850 km sewage disposalsince 1999

5. Fields of activity drinking water supply groundwater protection assumption of further tasks possible sewage disposal

6. Department of drinking water waterworks water storage tank & water storage tanks

7. Department of drinking water in figures members 9 rural districts 2 cities 1 municipality length of pipe system 13.000 km accesses to households320.000 clients880.000 drinking water release 69 Mill. m / year 3 capacity of the 15 waterworks 251.000 m / day 3 Stand: 4/2003 consumption per head121 l / day

8. Ankauf & Aufforstung Kooperation mit Landwirten Ökologischer Landbau purchase of land & afforestation cooperation with farmers organic farming Groundwater protection publicity purchase of land & afforestation Cooperation with farmers Organic farming groundwater protection

9. Information centres Old waterworks Langeoog Kaskade-information centre in Diekmannshausen Freshwater teaching trail in Nethen Service centre in the T.A.Z. in Oldenburg Organic farm Bakenhus in Großenkneten Tree and nature teaching trail in Holdorf

10. Island Langeoog

11. Ankauf & Aufforstung Kooperation mit Landwirten Ökologischer Landbau Freshwater lens rainfall evaporation North Sea clay sand + salt water freshwater lens sand + freshwater wadden sea well

12. Water protection area

13. Main problems 1.unsecure old deposition of harmful substances

14. Endangering old domestic garbage dump well with hydrocarbons

15. Main problems 1.unsecure old deposition of harmful substances 2.stability of freshwater lens

16. Chloride concentration

17. Main problems 1.unsecure old deposition of harmful substances 2.stability of freshwater lens 3.danger of flooding

18. Endangered catchment area catchment area

19. Endangered catchment area

20. Questions? Thank you for your attention!