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OPTIMA PROJECT
Tunisia case study
Fourth Management Board MeetingDecember 19-20, 2006 Milano
19/12/2006 CNTD-2006
CASE STUDY
Water useDomesticIndustryAgriculture
Incre
as
e
Melian basin
Area = 553Km²Population = 390 000 inhabitants 4 subcatchments Dense Drainage network
Aquifer
Lithology = Plio-quaternary Groundwater storage = 27.31 MCM/ year Exploitation = 28.1 MCM / year Nbre of Bore holes = 494State = overexploited
Nodes
2 reservoirs26 mountain lakes 2500 wells
Case study: Melian basin, TUNISIA
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RIVER BASIN DATABASE
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ECONOMICS
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DEMOGRAPHY
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INSTITUTIONS
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DEMAND
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RAINFALL- RUNOFF MODEL
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WATER RESSOURCE MANAGEMENT MODEL(WRM)
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Irrigation districts
Area(ha)
Water demand
(m3/ha/an)
Crops Water technolog
y
Ben Mahmoud 465 5 316 fruits Drip irrigation
Ksibi 316 3 618 fruits + vegetables
Drip irrigation
Vallée El Hma 207 2 000 fruits Drip irrigation
DATA COLLECTED
Irrigation Districts
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District
Domestic connecte
d
Domestic non
connected
Commer.use
Administ.use
Municipal use
Total
Industry Tourism
Other uses
total
BenArous
9909 14 468 590 256 1317
2817 9 123 14189
Water consumption volume per use (1000 m3 )- year 2000
DATA COLLECTED
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G.WRenewable ressource
(Mm3)Exploitable ressource
(Mm3)Water Earning / Deficit
Mornag 17.4 26.7 9.3-
Oligocène 7.3 11.9 4.6-
Miocene 4.3 1.0 +3.3
Geology stratum
TypeArea(km2)
Depth(m)
Precipitation(mm)
Infiltration coef
PorosityRenewable ressource
(m3)Storing coef
Geologic storing
(m3)
quaternary Sandy 183.6 150 464 20 120 17.04 8 1763
miocène Sandy 5 100 465 15 80 0.35 12 48
oligocène
Khlidia 58 120 400 13.3 70 3.09 10 406
Becbeka 96.5 200 467 8.8 100 3.97 10 965
Jbel Tella
4.5 120 360 12.8 70 0.21 10 31
DATA COLLECTED
Aquifer parameters
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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
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WATERWARE NODES CHART
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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-SONEDEl Gola-SONED
Demand node
Start node
End node
TPReservoir node
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Implementation of WRM model
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DOMESTIC NODE
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IRRIGATION NODE
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BIR M’CHARGUA RESERVOIR
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EL HMA RESERVOIR
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GROUNDWATER
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MIOCENOUS GW
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OLIGOCENOUS GW
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PLIO-QUATERNARY GW
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WRM RESULTS
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WRM RESULTS (2)
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WRM ECONOMIC RESULTS
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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 tothe deterioration of the groundwater quality
PROBLEMS RELATED TO OUR CASE STUDY
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Reduce the water exploitation of the groundwater
Creation of a new treatment plant in the area to exploit the treated water for irrigation
Restoration and rehabilitation of Sabkhat Sijoumi by ONAS (The National Sanitation Board 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
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THANK YOU FOR YOUR ATTENTION
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