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Past flooding data Belgium

Explore past flooding events in Belgium and Flanders from 1901-2000, focusing on weather events like rainfall and storm tides. Evaluate flood impact, database sources, and management strategies. Learn about flood delineation, socio-economic effects, and key databases in Belgium and Flanders.

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Past flooding data Belgium

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  1. Past flooding data Belgium Wouter Vanneuville 19-05-2011 CRED, Brussels

  2. Outline • Belgium? Flanders? • Sources of data about past floods • Conclusions • Database • Conclusions

  3. Belgium? or Flanders? • Meteorology: B • Water level / flood predictions: regions • Water management: regions ( + provinces, cities and villages, …) • Crisis management (civil security): B (+ provinces, cities and villages • Decree on integrated water management: Flanders • Law on natural hazards (insurance): federal Belgium

  4. Belgium? or Flanders? • For this presentation: • Partim past floods: Belgium • Partim database: Flanders

  5. Past floods

  6. Past floods • Weather events (1901-2000) • Floodings due to rainfall • Floodings due to storm tide (to a limited extend) • Quantitative: mm rainfall • Qualitative: flood impact • “no information” for calibration of flood hazard and risk maps as defined in EU Floods Directive

  7. Past floods • Zenne catchment (part of river Scheldt basin, incl. city of Brussels) • 1900-1974 • Very detailed in its description • Limited quantitative information

  8. Past floods • Socio-economic evaluation of the 1995 floods • Focus on tangible effects • Not only direct damage, insured damage, households and agriculture • Belgium

  9. Past floods • Evaluation of tools • Flood delineation • Flood damages • Results of models compared with data from the disaster fund • No perfect match!

  10. Past floods • municipality level versus (sub)catchment • Public goods • Franchise influencing number of file records?

  11. Conclusions – past floods • Preliminary exercise! • Heterogeneity of source data used • Focus on rainfall driven events • We got a file with 23 events • 1 unknown • 44 new • subjective selection based on descriptions • 12 information added • Mostly qualitative information

  12. Database • Belgium: CALIS (Service public fédéral Intérieur - Direction des Calamités) • Since 1993 • Event and impact • 65000 records

  13. Database • Flanders: Recently flooded areas (ROG) ROG information since 1988 (first compiled in 2000) • Event information • GIS layer (vector)

  14. Database • Collection of information: Topographic maps given to municipalities to draw contours Helicopter with WES cam makes movie during flood Interpretation of images by Agency for Geographic Information Flanders (AGIV), since 2007

  15. Database • Collection of information: “Correction” of information based on digital elevation model (DHM Flanders) 2010-2011: Coordination Commission for Integrated Water Management (CIW) visits all- affected municipalities, information directly drawn on computer Impact information is collected as well (water levels above doorstep, damages, …)

  16. Floods in Flanders • 10/2009: river IJzer • Return period Q IJzer (main river): > 100year • Flooded area > 30km² - Damage limited

  17. Flood maps LOT Foto overstroming rond sluis Lot (14/11/2010 14u) Overstromingskaart omgeving Lot (14/11/2010 14u)

  18. 30/11/2009 AGIV - WATLAB

  19. Conclusions • Different databases at different levels • Detailed event information separated from detailed impact information • Different reactions on collaboration with insurance industry since ‘law on natural hazards’ came into force

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