Dutch Flood Defence Presentation

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Dutch Flood Defence Presentation

  1. 1. The Dutch approach Peter C.G. Glas M.Sc. LL.M. Col(r.) President of the Dutch Association of Regional Water Authorities Paris, September 21, 2010 1
  2. 2. 2006
  3. 3. Netherlands – delta of 4 rivers Ems Scheldt Meuse Rhine
  4. 4. Netherlands = Pays Bas = Low lands = wetlands
  5. 5. The Netherlands without flood defence 29 % below sealevel 26 % floodplains 55 % flood risk area 10 million people € 2000 billion 6
  6. 6. Land subsidence per 100 years
  7. 7. Land subsidence, sea level rise and water management
  8. 8. Inundation depths 9
  9. 9. Urban development As a result of urban development, room for the river has been drastically reduced Arnhem 1830 Arnhem 2000
  10. 10. Storm surge 1953 175.000 ha 1.800 deaths
  11. 11. River flooding of 1995 250.000 evacuees Ooijpolder Land of Maas and Waal
  12. 12. Delta project 1958-1997 • 700 km sea defence • 12 dams • 4500 M€
  13. 13. High tech engineering solutions Maeslant closure Port of Rotterdam 450 M€ Eastern Scheldt closure Delta region 2500 M€
  14. 14. Room for the River 1995 – present • > 800 km dike improvement 400 M€ • 2200 M€ http://siti.feem.it/mulino/dissem/intcon/vanderm.pdf
  15. 15. Flood prevention principles for the future 1. Legally established flood safety standards 2. Water based physical planning and water proof building 3. Self reliance of the public and clear evacuation procedures – Awareness – Avoidance – Alleviation – Assistance 17
  16. 16. Three stages of flood defence Stage 3 Stage 2 Stage 1 18
  17. 17. Flood safety standards 1:10000 yr 1:4000 yr 1:2000 yr 1:1250 yr Investments & Operations: National 550 M€ (2008) Maintenance: Regional 200 M€ (2008) Source: Water in Beeld 2009
  18. 18. Rijkswaterstaat since 1798 National flood defence National highways 9000 fte, € 2.5 bln/y
  19. 19. Regional water authorities since 1250 “Waterschap” 3000 in 1950 26 in 2010 budget € 2,6 bln/y
  20. 20. Regional water authorities - self governance Independent government body: • 800 years old system • own legal power • own tax system • own elections • budget € 2,6 bln/y • 10.500 employees Water management tasks: • 16 million people • 235.000 km water courses • 17.500 km dikes, levees • irrigation and drainage • groundwater management • surface water quality • 390 urban wastewater treatment plants 22
  21. 21. Government institutions Netherlands Central Government General Provinces Functional Provincies democracy (12) democracy Municipalities Regional Water (431) Authorities (26) 23
  22. 22. Democratic representation • Waterschap: stakeholder democracy: o Residents o Industries o Farmers/landowners o Nature conservation 24
  23. 23. Association of Regional Water Authorities • Established in 1927 • Umbrella organisation of the 26 Regional Water Authorities in the Netherlands. • Offices in The Hague and Brussels • Promotion of regional water governance. 25
  24. 24. Flood resilient cities Some examples of urban protection in the Netherlands 26
  25. 25. Examples 1 Port of Rotterdam storm surge barrier Restoration of catchment storage capacity 27
  26. 26. Examples 2 Flooding „s-Hertogenbosch 1995 Storage basin & Nature conservation area 6 million m3 storage Return period 1/25 year 28
  27. 27. Examples 3 Flood-proof building in flood plains Dordrecht Floating houses Amsterdam 29
  28. 28. Conclusions • Awareness, Alleviation, Avoidance & Assistance are key factors in an ingrated flood prevention approach. • Physical planning should be based on the scale of the river (sub)catchments. • Flood prevention and flood management depend on leadership in government and a financially sustainable budget. • The costs of flood prevention and flood management in the Netherlands is appr. € 1,5 bln/y or 0,2% of GNP. • Self governance and self financing of the regional water authorities should be maintained. 30
  29. 29. Thank you for your attention 31

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