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Dutch approach for setting GEP (and MEP)

Dutch approach for setting GEP (and MEP). Marcel van den Berg Ministry of Infrastructure and Environment / Rijkswaterstaat. In this presentation. General description development of GEP in 4 steps Methods for estimation of effect of measures Examples of GEPs Measures and more

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Dutch approach for setting GEP (and MEP)

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  1. Dutch approach for setting GEP (and MEP) Marcel van den Berg Ministry of Infrastructure and Environment / Rijkswaterstaat

  2. In this presentation • General description development of GEP in 4 steps • Methods for estimation of effect of measures • Examples of GEPs • Measures and more • Discussion and Conclusions

  3. Alternative approach (Prague, 2005) Reference condition hydromorphological alteration MEP mitigation GEP ecological status/EQR all possible measures minus measures with small ecological effect Method GEP:CIS guidance 2003 Present ecological status

  4. 2: all possible measures 3: GEP derived in 4 steps 1: all measures • EC and national policies (Nitrate- and Urban Wastewater Directive, national program on diffuse pollution, etc) • All other measures (derived from a national database)

  5. Step 4. Calculation GEP • Estimation effect for measures in EQR units per body • Added to present ecological status (for each quality element) • Correction for combined effect • Validation by 2nd opinion of experts Result of the 4 steps: a national database with for each water body • All measures • Size • Costs • Responsible authority • Numerical GEP

  6. Methods for estimation of effect of measures • Ex-ante evaluation (=multi-variate/statistical model) • National data • Used for national policies and decision making • Method not used in the RBMPs • WFD explorer (=tool kit with different types of models) • Practical knowlegde / expert judgement • In principle: quantitative and expressed at metric for natural water body

  7. Modified river GEP Objective in RBMP 0.42 0.28 0.15 EQR Comparability GES and GEP Natural river IC type RC1/4 national type R5 1.0 GES 0.8 0.6 0.4 0.2 EQR

  8. Comparability GES and GEP - results(Rhinedelta, 490 of 723 Dutch waterbodies)

  9. Example Haringvliet and GEP for fish • Haringvliet sluices: fish migration obstacle • Dam function is: safety and fresh water supply • RBMP: sluices are allowing passive and active migration of fish (e.g. 75% of time open) • Effect is estimated for fish metric as 0.20 EQR units (=improvement of one quality class) • Direct connected above stream waters have get similar effect

  10. GEPs of Haringvliet/Hollandsdiep in RBMP(now tidal River former Estuary)

  11. Overview all measures: RBMP’s Hydromorphological measures(WFD art 11.3i) • 1727 km restoration of land-water gradients in lakes and canals (3357) • 729 km restoration of land-water gradients and re-meandering in rivers (930) • 1362 ha creation of wetlands (704) • 635 solutions for fish-migration at weirs (884) • Water level management, creation of side channels, etc Supplementary measures(WFD art 11.4) • Fishmanagement (‘biomanipulation’) • Management of macrophytes • Education, further research, etc  4.2 billion € extra costs

  12. Discussion • Numerical GEPs help us to be: • compliant with WFD • transparent about the expected effect of measures taken/planned • flexible in measures as long as same effect is achieved • The method and value of deriving GEPs is less important than its result: • a set of measures and its positive effects • (potential) negative effects on the use • costs of measures

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