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Aquifers of the Scheldt basin

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Aquifers of the Scheldt basin. Testing the guidance document WATECO & IMPRESS groups Gabrielle Bouleau (ENGREF) & Arnaud Courtecuisse (AEAP). WFD objectives for aquifers. The WFD indicates in Article 4 : - PowerPoint PPT Presentation
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  • 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

  • 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

  • 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

  • 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

  • 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

  • Abstractions from each unit

  • 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

  • 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

  • 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

  • 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

  • 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

  • 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%

  • 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

  • Cost-effectiveness of measures

    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

  • Communication campaignGlobal cost of 2 550 000 Euros for Lille AreaLess water incomeLess maintenance ?Higher price ?

    Feuil1

    HouseholdsMunicipalitiesIndustryAgricultureLeakagesLille industrielleOther municipalities

    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

    HouseholdsMunicipalitiesIndustryAgricultureLeakagesLille industrielleOther municipalities

    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

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