improvement of the water quality in the water catchment of ...€¦ · astee 96th annual conference...
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ASTEE 96th Annual Conference – June 6 to 9, 2017
Results after 12 years of actions and follow-up
Improvement of the water quality
in the water catchment of
Arquennes
Liège, Belgique
Dr ir Christophe Vandenberghe
Session : 15
08/06/2017
#ASTEE2017
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December 1991 : vote of the Directive 91/676/CEE on the protection of waters
against pollution caused by nitrate from agricultural sources
• Designation of the nitrate vulnerable zones
• Establishment of action programmes and codes of good agricultural practice
• Monitoring of the water quality
• Assessment of the impact of action programmes
• 4-yearly reports
The Nitrate Directive
Introduction
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Introduction
The water catchment of Arquennes
Liège
Arquennes
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Introduction The water catchment of Arquennes
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Introduction The water catchment of Arquennes
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Introduction The water catchment of Arquennes
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Introduction The water catchment of Arquennes
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Multidisciplinary Partnership
• Agricultural advisors
• Scientists
• Water producer
2004 - 2010
1st stage : understanding and advise
Objectives
• To advise the farmers for application of the PGDA (the
Nitrate Directive in the Walloon region)
• To assess the effects of PGDA on water quality
• If needed to propose solutions.
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Advise part
1st stage : understanding and advise
Subjects
• Soil linkage ratio and transfer of manure between farms
Amount of N-manure produced by the farm
Maximum amount of N-manure spreadable
• Catch crops
• Manure storage capacities
• N fertilization
• Soil nitrogen residue (APL in french)
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Objectives
• To assess the PGDA (Walloon implementation of the Nitrate Directive)
• If needed, to propose solutions
Tool : modelling
• characterisation of the water catchment (calibration)
• experimentation (validation)
Scientific part
1st stage : understanding and advise
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Scientific part
1st stage : understanding and advise
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Scientific part
1st stage : understanding and advise
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Evaluation of the nitrate flows
• Vadose zone
• Saturated zone
Scientific part
1st stage : understanding and advise
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1st stage : understanding and advise
Scientific part
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Objectives :
• Agricultural practices after the “advise period” ?
• Trend of the water quality ?
• Relation between soil nitrogen residue (APL) and nitrate concentration of the water ?
2011 - …
2nd stage : follow-up
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• Yearly soil sampling
of all the parcels of
the water
catchment
• Comparison to
references
Assessment of the
nitrogen management
2nd stage : follow-up Agricultural practices?
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Mean Soil nitrogen residue (APL) at water catchment scale
APL – water quality
2nd stage : follow-up
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Trend of the nitrate concentration in the groundwater
APL – water quality
2nd stage : follow-up
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APL controls in the nitrate vulnerable zone
APL – water quality
At nitrate vulnerable zone scale
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Mean APL by groundwater body
APL – water quality
At nitrate vulnerable zone scale
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Conclusions
• Good acceptance of agricultural advisors
• PGDA applied Sufficient water quality
• APL : indicator related to water quality
Improvement of the water quality in the water catchment of Arquennes
Results after 12 years of actions and follow-up
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on fèl mèrcî di m’awè bin choûté !
Improvement of the water quality in the water catchment of Arquennes
Results after 12 years of actions and follow-up