River Basin Management Plan North West River Basin District Annex
Implementation of the water framework directive Global testing of the three step approach to a river...
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Implementation of the water framework directive
Global testing of the three step approach to a river basin
Mars 2002 - DCE/analyse économique - 2
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Mars 2002 - DCE/analyse économique - 3
The Sèvre Nantaise river basin
2370 km2
290 000 habitants Drinking water : 10.6 Mm3/year, 3 dams
+ importation Irrigation : 12 Mm3 per year Industry : 96 main industries fishing, boats, tourism
Mars 2002 - DCE/analyse économique - 4
What is expected ?
Feasability of the method ? Data availability ? Lessons and limits of the case study ?
Mars 2002 - DCE/analyse économique - 5
The method
Baseline scenario till 2015 = basic measures = scenario 1
Case n°1 :No gap from good water status :
scénario 1
Case n°2:Gap
Supplementary measures
Case n°2 :
no disproportionate costs scenario 2
Case n°3 : disproportionate costs scenario 3
Mars 2002 - DCE/analyse économique - 6
Scenario 1 = basic measures
Depollution in livestock farms Urban depollution ( carbon pollution) Increase of stream during dry season Zones of protection for drinking water
Cost = 6.1 million € per year
Mars 2002 - DCE/analyse économique - 7
Scenario 2Scenario 1 +
Extending protected zones Treatment of phosphorus and nitrates Treatment of bacteriological pollution Grass belts Restoration and preservation of rivers Developing tourism
Cost = 17.6 million € per year
Mars 2002 - DCE/analyse économique - 8
Scenario 3 = «reduced» scenario 2
Supplementary measures are limited to drinking water protection Scénario 1 +
Extending protected zones Treatment of phosphorus and nitrates Grass belts
Cost = 8.3 million € per year
Mars 2002 - DCE/analyse économique - 9
Scenarios CostsM€ / year
ProfitsM€ / year
1 6.1 2
2 17.6 11 to 13
3 8.3 3
Profits : drinking water treatment, fishingWith bad assessment of non marketable profits
Mars 2002 - DCE/analyse économique - 10
Rate of cost recovery(without environmental and non marketable costs)
Users rate
Domestic 90 %
Irrigation from a riverrealimented by a dam
34 %
Irrigation from a smallreservoir
33 %
Irrigation individualborehole
110 %
Mars 2002 - DCE/analyse économique - 11
Limits and lessons (1/2) Heterogenity of data : geographical scale and
reliability Unavailable data : on unitary benefits, water
pricing for industry Lack on monetarized data for both
environmental costs and benefits
Mars 2002 - DCE/analyse économique - 12
Limits and lessons (2/2)
The link between technical and economic activities needs to be strengthened
The scoping activity doesn’t allow to test comprehension and acceptability of local stakeholders