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Diagnosis runoff concept

Diagnosis runoff concept. Julie Maillet-Mezeray, Benoît Réal Arvalis-Institut du Végétal, France. EU Stakeholder Workshop, 26th April 2012, Brussels. Flow theme. Different water pathways Datas needed to assess water pathways Existing audit methodology

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Diagnosis runoff concept

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  1. Diagnosisrunoff concept Julie Maillet-Mezeray, Benoît Réal Arvalis-Institut du Végétal, France EU Stakeholder Workshop, 26th April 2012, Brussels

  2. Flow theme • Different water pathways • Datas needed to assess water pathways • Existing audit methodology • Decision support tools to help decisionmaking

  3. Linking water pathway and mitigation measures • Different water flow paths • Possible ways of transfer for potential pollutants • BMP options adapted to type of water flow path Surface Run off Soil surface Permeability disruption Lateralseepage or drainage Leaching

  4. Audit methodology • Diagnosistool to prevent the contamination of water by pesticides atfieldscale • Diagnosistool to locate and size buffer zones Based on french approach (ARVALIS – Institut du végétal + CORPEN + IRSTEA) OptimizedamongProwadispartners, focusing on runoff

  5. - sol argileux sauf sol argileux Audit methodologyatplot scale 1 2 Data collection Identification of water circulation and exposed water Landscape, farm description, types of soil, geology… with the farmer Hydrologycategorisationattheplotscale Method 5 3 Assesseffect of practices Propose adaptedsolutions 4 • Soil management • Cropping practices • Adapting PPP and timing • Vegetative buffer • Wetlands Tillage practices, application periods and PPP Used Duringbothspring and winter time Riskassessment Linking water circulation at plot scalewithin the catchment Developed by ARVALIS-Institut du végétal : : AQUAPLAINE® Based on CORPEN methodology

  6. Identify water circulation (step 2)

  7. Data to integrate (step 2) Soil: Texture, permeability of the surface horizon, coarse fragments and shrinkage cracks Soil saturation period Meteorological data + Substrate: Depth, break in permeability and inclination Type of water flow in the soil Direction in which the water is flowing + Landscape: Slope and sinkholes Buffer zones + Effect of practices on water flow Cultivation data Crop, date sown and crop rotation Tillage pan Adjustments: Drainage and drain performance Intensity of water flow

  8. Field observations: concentratedrunoff 2012 Source : G.Le Hénaff - IRSTEA 2012 Source : G.Le Hénaff - IRSTEA

  9. Field observations: runoff by capping

  10. Field observationson buffer zones Source : G.Le Hénaff - IRSTEA

  11. Local conditions, local results Example 2 Example 1 Adapte mitigation measures to pathways Drainage Surface runoff, erosion No risk Catchment of la Nonette Catchment of agripéron

  12. Scale of diagnosis case study 2012 JMM - ARVALIS

  13. Scale of diagnosis case study

  14. Support risk assessment Catchment + field diagnosis observations DETERMINE RISK SITUATION

  15. Decisiontreesparametrization Description of the characteristic of the soil - clayey and loamy soils (>35% clay, <30% sand) - swelling clays >25% - capping soils Rest Description of risk level and bunch of proposals

  16. Integratingcrop practices Soil management No-till Disk tillage Ploughing Vegetation cover Covered limited cover No cover

  17. Concentratedrunoff

  18. Differentscales for the diagnosis Area Catchment

  19. Conclusion • Field audit needed • Methodologyavailable • Help tool to support audit: decisiontrees in progress Practical, acceptable, implementable

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