19/12/2006 CNTD-2006 OPTIMA PROJECT Tunisia case study Fourth Management Board Meeting December 19-20, 2006 Milano

19/12/2006 CNTD-2006 CASE STUDY Water use  Domestic  Industry  Agriculture Increase Melian basin Area = 553Km² Population = inhabitants 4 subcatchments Dense Drainage network Aquifer Lithology = Plio-quaternary Groundwater storage = MCM/ year Exploitation = 28.1 MCM / year Nbre of Bore holes = 494 State = overexploited Nodes 2 reservoirs 26 mountain lakes 2500 wells Case study: Melian basin, TUNISIA

19/12/2006 CNTD-2006 RIVER BASIN DATABASE

19/12/2006 CNTD-2006 ECONOMICS

19/12/2006 CNTD-2006 DEMOGRAPHY

19/12/2006 CNTD-2006 INSTITUTIONS

19/12/2006 CNTD-2006 DEMAND

19/12/2006 CNTD-2006 RAINFALL- RUNOFF MODEL

19/12/2006 CNTD-2006 WATER RESSOURCE MANAGEMENT MODEL (WRM)

19/12/2006 CNTD-2006 Irrigation districtsArea (ha) Water demand (m 3 /ha/an) CropsWater technology Ben Mahmoud fruitsDrip irrigation Ksibi fruits + vegetables Drip irrigation Vallée El Hma fruitsDrip irrigation DATA COLLECTED Irrigation Districts

19/12/2006 CNTD-2006 DistrictDomestic connected Domestic non connected Commer. use Administ. use Municipal use TotalIndustryTourismOther uses total Ben Arous Water consumption volume per use (1000 m 3 )- year 2000 DATA COLLECTED

19/12/2006 CNTD-2006 G.W Renewable ressource (Mm 3 ) Exploitable ressource (Mm 3 ) Water Earning / Deficit Mornag Oligocène Miocene Geology stratum Type Area (km 2 ) Depth (m) Precipitation (mm) Infiltration coef Porosity Renewable ressource (m 3 ) Storing coef Geologic storing (m 3 ) quaternarySandy miocèneSandy oligocène Khlidia Becbeka Jbel Tella DATA COLLECTED Aquifer parameters

19/12/2006 CNTD-2006  Dams: name, coordinates, sector, year of construction, storage capacity, irrigated area, inflow water, name of catchment…  Collection of historic data related to the wells’ observation in the groundwater  Mountains Lakes: name, coordinates, realization year, name of catchment, area of the catchment, storage capacity, delegation…  Observation well: name, coordinates, year, dry residue, standing water level…  Collection of 2500 wells built in the case study: complete information is available concerning: wells depth, diameter, usage, exploitation, equipment, standing water level, dry residue…  Collection of hydrologic, hydrogeologic and economic data DATA COLLECTED

19/12/2006 CNTD-2006 WATERWARE NODES CHART

19/12/2006 CNTD-2006 NEW TOPOLOGIC MODEL M’chergua reservoir Sea Melian basin Melah basin Rmel basin Hma basin Hma reservoir Irrigation TP Domestic Industry Medjerda canal GW GW-SONED El Gola-SONED Demand node Start node End node TP Reservoir node

19/12/2006 CNTD-2006 Implementation of WRM model

19/12/2006 CNTD-2006 DOMESTIC NODE

19/12/2006 CNTD-2006 IRRIGATION NODE

19/12/2006 CNTD-2006 BIR M’CHARGUA RESERVOIR

19/12/2006 CNTD-2006 EL HMA RESERVOIR

19/12/2006 CNTD-2006 GROUNDWATER

19/12/2006 CNTD-2006 MIOCENOUS GW

19/12/2006 CNTD-2006 OLIGOCENOUS GW

19/12/2006 CNTD-2006 PLIO-QUATERNARY GW

19/12/2006 CNTD-2006 WRM RESULTS

19/12/2006 CNTD-2006 WRM RESULTS (2)

19/12/2006 CNTD-2006 WRM ECONOMIC RESULTS

19/12/2006 CNTD-2006  Water supply is very dependent on the external importations of water  Water management in the basin is very complex because of the multitude of stakeholders involved in water issues  Drainage of used water (from sabkhat sijoumi) into the Melian basin is causing pollution into marine environment  The runoff in the Melian basin is very low  The groundwater is overexploited (150%), this situation leads to the deterioration of the groundwater quality PROBLEMS RELATED TO OUR CASE STUDY

19/12/2006 CNTD-2006  Reduce the water exploitation of the groundwater  Creation of a new treatment plant in the area to exploit the treated water for irrigation The National Sanitation Board  Restoration and rehabilitation of Sabkhat Sijoumi by ONAS (The National Sanitation Board )  Increase of the groundwater quantity by artificial recharge coming from surface water that is not exploited at present WATER RESOURCES OPTIMIZATION

19/12/2006 CNTD-2006 THANK YOU FOR YOUR ATTENTION