Aquifers of the Scheldt basin

Aquifers of the Scheldt basinTesting the guidance documentWATECO & IMPRESS groups
Gabrielle Bouleau (ENGREF) & Arnaud Courtecuisse (AEAP)

WFD objectives for aquifersThe WFD indicates in Article 4:(ii) Member States shall protect, enhance and restore all bodies of groundwater, ensure a balance between abstraction and recharge of groundwater, with the aim of achieving good groundwater status at the latest 15 years after the date of entry into force of this Directive,

Questions for the testingDo abstractions exceed the natural recharge (today and in the baseline scenario)? If so, what are the possible measures and their cost-effectiveness ?

Selection of the case studyCarboniferous limestone International Groundwater in the Scheldt basinover-exploitedcompetition between industriesnational strategies to avoid a common assessmentDifferent definitions of the aquiferno comparable data

Pilot on the Scheldt International River Basin Testing the Guidance Document , Making the WFD implementation operational
A : holocene and pleistocene
NORD
Chalk aquifer
Paleozoic
Coal
Scheldt
Leie
B : eocene and oligocene
Carboniferous Limestone aquifer
PAGE
9
A : holocene and pleistocene
NORD
Chalk aquifer
Paleozoic
Coal
Scheldt
Leie
B : eocene and oligocene
Carboniferous Limestone aquifer

Selection of the case studyChalk aquifer around Lille area National groundwater in the Scheldt basinover-exploitation and pollutionalternative resource of the carboniferous limestoneexisting coherent data

The 3-steps approachCharacterisation of groundwaters1. Definition of relevant hydrogeological units2. Assessment of the natural recharge of each unit3. Assessment of abstractions from each unit4. Structure of the demand 5. Evolution of the demand Future demand versus natural recharge (gap assessment)Cost-effectiveness analysis of possible measures

Relevant units: assumptionsPool model

Relevant units in Lille areacarboniferous

Relevant units in Lille area

Natural recharge of each unitDifferent definitions: different values
Pools
Natural recharge (source BRGM)
North of Mlantois
19,5 Mn m3/yr = 53 400 m3/day
South of Mlantois
22,5 Mn m3/yr = 61 600 m3/day
Basin of Orchies
unknown
Lys at Aire sur la Lys
unknown
Cenomanian in Verchin
unknown
Carboniferous limestone
50 Mn m3/yr =137 000 m3/day

Abstractions from each unit

Structure of the demandData for 2000
Graph1
109200
14510
22100
1000
42190
4600
12000
m3/day
Feuil1
HouseholdsMunicipalitiesIndustryAgricultureLeakagesLille industrielleOther municipalities
Total109,20014,51022,100100042,1904,60012,000
Feuil1
m3/day
Feuil2
Feuil3

Evolution of the demandno change in the population and economic developmentsno change in consuming behavioursno change in distribution of abstraction
Consequences by the year 2015:same situation as in 2000, no measure implemented. To be negotiated

Gap assessmentTarget for the testing: 70 % 10 200 m3/day needed
Groundwater pool
Abstraction for the area of Lille in m3/day
proportion
recharge
in m3/day
rate abstraction/recharge
Carboniferous
30 000
16%
unknown
North of Mlantois
26 000
14%
53 000
49 %
South of Mlantois
64 000
34%
61 000
105 %
Basin of Orchies
31 000
16%
unknown
Lys river
38 000
20%
unknown
Total
189 000
100%

Cost-effectiveness of measures
Graph1
109200
14510
22100
1000
42190
4600
12000
m3/day
Feuil1
Total109,20014,51022,100100042,1904,60012,000
Feuil1
m3/day
Feuil2
Feuil3

Communication campaignGlobal cost of 2 550 000 Euros for Lille AreaLess water incomeLess maintenance ?Higher price ?
Feuil1
Total109,20014,51022,100100042,1904,60012,000
PopulationCostwater-savingsm3/inhabitantCost (E) /inhabitant
Alcobendas100,000410,6001,65064.106
Lille area1,000,00010,2003.722.55
27.9452054795
Feuil1
m3/day
Feuil2
Feuil3
Feuil1
Total109,20014,51022,100100042,1904,60012,000
PopulationCostwater-savingsm3/inhabitantCost (E) /inhabitant
Alcobendas100,000410,6001,65064.106
Lille area1,000,00010,2003.722.55
m3/inhabitantCost (E) /inhabitant
Alcobendas64.106
Lille area3.722.5527.9452054795
Feuil1
m3/day
Feuil2
Feuil3

Conclusion of the testingRelevant scale: public water services + self servicesto take into account possible shiftsNatural recharge and abstractions assessmentStrategic informationCommon monitoring neededIndirect effects of water savingsfeedbacks on price or maintenance

Date post:	21-Jan-2016
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Aquifers of the Scheldt basin

Documents

demand future demand

recharge of groundwater

assessment of abstractions

bodies of groundwater

testingdo abstractions

scheldt basintesting

scheldt basinoverexploitation

good groundwater status

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