Past flooding data Belgium

Wouter Vanneuville19-05-2011

CRED, Brussels

Outline

• Belgium? Flanders?• Sources of data about past floods

• Conclusions• Database

• Conclusions

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

Belgium? or Flanders?

• For this presentation:• Partim past floods: Belgium• Partim database: Flanders

Past floods

original source input

Id original source input

additional input FI-DB-ID

Picture Ref country flood type

trans-boundery

event

State of emergenc

y

Call for internat.

Assistance location latitude longitude riverbasin GIS Ref.Year

(start)Month (start)

Day (start)

EM-DAT 23 BE-1906-1 BelgiumLouvain region 1906 5 14

EM-DAT 24 BE-1906-2 Belgium 1906 4 0

EM-DAT 18 BE-1926-1 BelgiumGeneral flood Meuse, Zenne 1925 12 29

EM-DAT 22 BE-1928-1 Belgium Yes Termond 1928 11 28

General Information Spatial Information Temporal information

fatalities injured affected homeless

tot_affected (total affected) Total loss Insured loss Currency

adjusted for

inflation

6 0 0 No0 0 0 No

0 0 0 No17 6000 6000 0 No

0 0 0 No

11 350 350 0 No4 0 0 No

0 600 600 0 No

0 0 0 No

3 0 0 No

Economic impactSocial Impact

Wouter Vanneuville:unclear if this if for Belgium only or for Belgium and the Netherlands (probably the last one)

Wouter Vanneuville:one of the 3 most catastrophic events in the Meuse basin of the century (together with 1993 and 1195)

Wouter Vanneuville:must be much more

Wouter Vanneuville:+/- 100 housholds

Wouter Vanneuville:mentioned as significant

KMI BE-1974-1 BelgiumGeneral flood

west and centre of country

KMI BE-1976-1 BelgiumGeneral flood

Ruisbroek (Puurs), Moerzeke Rupel, Scheldt

KMI BE-1977-1 BelgiumGeneral flood Sambre, Ourthe

KMI BE-1977-2 Belgium coast

KMI BE-1979-1 BelgiumPluvial flood Aarschot Demer

KMI BE-1980-1 BelgiumGeneral flood

e.g. Houyet Meuse

KMI BE-1983-1 BelgiumPluvial flood Dessel

KMI/ETS BE-1990-1 BelgiumGeneral flood

Rupelmonde, Lokeren, Zele e.a. Rupel, Durme

Wouter Vanneuville:dike breaches

Wouter Vanneuville:storm winds

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

Past floods

• Zenne catchment (part of river Scheldt basin, incl. city of Brussels)

• 1900-1974• Very detailed in

its description• Limited

quantitative information

Past floods

• Socio-economic evaluation of the 1995 floods

• Focus on tangible effects• Not only direct damage,

insured damage, households and agriculture

• Belgium

Past floods

• Evaluation of tools• Flood delineation• Flood damages

• Results of models compared with data from the disaster fund

• No perfect match!

Past floods

• municipality level versus (sub)catchment

• Public goods

• Franchise influencing number of file records?

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

Database

• Belgium: CALIS (Service public fédéral Intérieur - Direction des Calamités)

• Since 1993• Event and impact• 65000 records

Database

• Flanders: Recently flooded areas (ROG)

ROG information since 1988 (first compiled in 2000)

• Event information• GIS layer (vector)

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

Database

• Collection of information:

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,

…)

“Correction” of information based on digital elevation model (DHM

Flanders)

Floods in Flanders

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

Flood maps

CATC

1

Legende

Overstroming_2010_Nov_14_15

Rivieren

0

Overstromingskaart omgeving Lot (14/11/2010 14u)

Foto overstroming rond sluis Lot (14/11/2010 14u)

LOT

30/11/2009

AGIV - WATLAB

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