1. 1 New data to update the models: After the stakeholders workshop Third Management Board Meeting Gumpoldskirchen 18-19 May 2006

2. 2 INTRODUCTION - Stakeholders workshop was organised at the CNT, the 3rd of May 2006 with the IRMCo collaboration - 18 \ 26 institutions were present - 29 stakeholders+11 from CNT 40 participants

3. 3 Agriculture 7 Environment 4 Research 5 ONASCITETANPEFSTENIT INRST Associations & Expert 2 DGREDGBGTH CRDA Ben Arous UTAP DGACTA BIRH DGGREE INATINRGREF Stakeholders Institutions CRDA Zaghouan APAL Expert

4. 4 Programme Presentations ONAS OPTIMA project IRMCo objectives in the workshop Melian case study: RRM and WRM models Round tables 03 round tables

5. 5 Round table 1: State of the Water Ressources in Basin Discuss the issues questionnaires RESULTS: Problem statement for melian Basin - Water management in the basin is very complex because of the multitude of stakeholders involved in water issues - The rainfall in the Melian basin is low (450mm) - Water supply is very dependent on the external importations of water -Discharge of Untreated wastewater (from sabkhat Sijoumi) into the Melian basin is causing pollution into marine environment -Groundwater is overexploited (150%), this situation lead to deterioration of the groundwater quality (salinity)

6. 6 Round table 2: Diagnostics of the water ressources - Present the topological model of the melian basin - Make a critical review of the current model outputs Results 1.- Water Demand

7. 7 2.- Topological Model 2. Topological Model Melian Basin 1 Basin 2 Bassin El Hma El Hma dam STEP Tourisme Domestic Industrie Canal Medjerda Irrigation Grounwater Sea Demand Start EndNœud de sortie Treatement Reservoir ? ? ? ?

8. 8 The new topological Model M’chergua reservoir Sea Melian basin Melah basin Rmel basin Hma basin Hma reservoir Irrigation STEP Domestic Industry Medjerda canal GW Lacs GW-SONED El Gola-SONED 3 Demand node 9 start node 1 End node 1 Treatment node 2 reservoir node

9. 9 Round table 3: Alternative water management scenarios Compare the performance of baseline scenario Results 1.- water scenarios - Reduce the water exploitation of the groundwater -Create of a new treatment plant in the area, to exploit the treated water for irrigation - Management of sabkhat sijoumi by ONAS -The groundwater quantity by artificial recharge coming from surface water (15Mm3) that is not exploited now

10. 10 2.- Values assigned to a set of performances indicators Round table 3: Alternative water management scenarios

11. 11 CONCLUSION -We constitute a steering committee with 7 stakeholders INRGREF, CRDA, DGRE, UTAP, DG ACTA, ANPE - Meeting every 3 months - Give us the data missed and issues questionnaires -Work on economic evaluation, optimisation, water technology, water quality)

12. 12 THANK YOU FOR YOUR ATTENTION