1. Working Group F Thematic Workshop on Flood Mapping Dublin, 17. -19
Working Group F Thematic Workshop on Flood Mapping Dublin, September 2008
Flood Risk Management – Hazard and Risk Maps (HARM)
– First Results for Germany
Prof. Dr. Martin Socher
Sächsisches Staatsministerium für Umwelt und Landwirtschaft

2. 1. German Situation Federal Republic with 16 Federal Länder
Referat:
Oberflächengewässer, Hochwasserschutz
1. German Situation
Federal Republic with 16 Federal Länder
Direct neighbour of 8 EU Member States and Switzerland
Drainage area for Baltic Sea, North Sea and Black Sea
Ten River Basins, only one entirely in Germany (Weser)
Member of a number of International River Commissions such as Rhine, Maas, Danube, Oder, Elbe
As a consequence transposition of Flood Risk Management Directive must be based on inner German Harmonisation and European Cooperation and Solidarity
17. September 2008

3. Main River Basins in Germany
Referat:
Oberflächengewässer, Hochwasserschutz
Main River Basins in Germany
(from Water Framework Directive)
Maas
Rhine
Ems
Weser
Elbe
Eider
Schlei/Trave
Warnow/Peene
Odra
Danube
17. September 2008

4. To report / complete until national international
Referat:
Oberflächengewässer, Hochwasserschutz
Article
To report / complete until
national
international
Art. 13 (1),
13 (2), 13 (3)
Transitional Measures X
X /13 (3)/
Art. 4 (3)
Preliminary flood risk assessment -Transfer of information x
X Coordination
Art. 4 (4)
Preliminary flood risk assessment
Art. 5 (1)
Identification of risk
Art. 5 (2)
Identification of risk - Coordination
Art. 6 (8)
Flood hazard maps/
Flood risk maps
Art. 7 (5)
Flood risk management plans
Art. 7 (4) and 8(2)
Flood risk management plans – Principle of solidarity
17. September 2008

5. Major Flood Events in Germany (Data from Dartmouth Flood Register)
Referat:
Oberflächengewässer, Hochwasserschutz
Major Flood Events in Germany (Data from Dartmouth Flood Register)
17. September 2008

6. Recommended structure of flood hazard map projects:
Referat:
Oberflächengewässer, Hochwasserschutz
2. Current Approach in Germany Flood hazard map guidelines of the German Working Group of the Federal States on Water Issues – Overview (Bund / Länder-Arbeitsgemeinschaft Wasser (LAWA))
Recommended structure of flood hazard map projects:
Project definition; data inventory and requirements analysis
Definition of the relevant topography
Hydrology and hydraulics
Map production
Public information measures
17. September 2008

7. – Define investigation area
Referat:
Oberflächengewässer, Hochwasserschutz
1. Project definition; data inventory and requirements analysis – Define the organisational chart (concerning responsibilities, public relations, data collection activities)
– Define investigation area
– Verify available data and identify data gaps
– Estimate cost and effort for data collection and processing
2. Definition of the relevant topography
– Survey the watercourse
– Define all basic essentials for hydraulic analysis (cross sections, engineering structures ...)
– Create terrain models (by photogrammetric analyses or laser scanning)
17. September 2008

8. 3. Hydrology and hydraulics
Referat:
Oberflächengewässer, Hochwasserschutz
3. Hydrology and hydraulics
– Create numerical model for hydraulic analysis
– Carry out hydrological calculations
– Determine water levels, velocities and flooded areas
4. Map production
– Produce flood hazard maps according to standardised layout specifications
5. Public information measures
– Publish and distribute the maps
– Training for map use, i. g. workshops
17. September 2008

9. River Müglitz 2002 (Elbe River basin) Referat:
Oberflächengewässer, Hochwasserschutz
River Müglitz 2002
(Elbe River basin)
17. September 2008

10. River Schwarze Elster 2006 (Elbe River basin) Referat:
Oberflächengewässer, Hochwasserschutz
River Schwarze Elster 2006
(Elbe River basin)
17. September 2008

11. River Elbe (Dresden) 2006 Referat:
Oberflächengewässer, Hochwasserschutz
River Elbe (Dresden) 2006
17. September 2008

12. 3. Potential flood hazard map users
Referat:
Oberflächengewässer, Hochwasserschutz
3. Potential flood hazard map users
Water management agencies
Regional/land use planning agencies
Local planning agencies
Disaster and emergency planning agencies
Insurances
Stakeholders affected by flooding
17. September 2008

13. developing and prioritizing flood protection plans
Referat:
Oberflächengewässer, Hochwasserschutz
The water management agencies of Germany's Bundesländer can use flood hazard maps as a basis for the following:
developing and prioritizing flood protection plans
planning the reactivation of existing water retention areas
formulating the relevant policies
developing guidelines for handling substances that pose a risk to water resources, by mapping areas at risk
identification of floodplains.
17. September 2008

14. Flood fighting and disaster control agencies
Referat:
Oberflächengewässer, Hochwasserschutz
Flood fighting and disaster control agencies
Flood hazard maps provide information concerning flood conditions (water depth, flood water velocity) in a specific area, and thus allow for planning and implementation of strategic action plans for specific scenarios. Specific analyses of data sets comprising an amalgamation of flood hazard map information and additional empirical data allow for the following:
Hazard identification
Optimized use of human and material resources
Identification and optimization of evacuation routes
Identification of the need for additional flood barriers (horizontal structures) and secondary lines of defence against floods so as to avoid or delay the inundation of other areas when primary flood barriers fail.
17. September 2008

15. Referat:
Oberflächengewässer, Hochwasserschutz
4. Flood hazard zone maps
Flood hazard zone maps show area-specific flood hazard categories based on the interplay between probability and intensity. Figure 2 shows the relationship between flood intensity and the probability of flooding, based on the following flood hazard categories:
Extreme hazard (red)
Moderate hazard (blue)
Low hazard (yellow)
Residual hazard (hatched)
17. September 2008

16. Referat:
Oberflächengewässer, Hochwasserschutz
Figure 2: Hazard categories based on the interplay between probability (horizontal) and intensity (vertical), categories: high, medium low, very low
17. September 2008

17. Flat areas Steep areas Water depth (h) Water velocity (v)
Referat:
Oberflächengewässer, Hochwasserschutz
Table 3: Examples of intensity classifications
Flat areas
Steep areas
Intensity
Water depth (h)
Water velocity (v)
High
>2.0 m
> 2 m/s
Medium
0.5 to 2.0 m
0.5 to 2.0 m/s
Low
< 0.5 m
< 0.5 m/s
17. September 2008

18. EU Flood Direktive III.6 (5) c): Flood Risk Maps -
Referat:
Oberflächengewässer, Hochwasserschutz
EU Flood Direktive III.6 (5) c):
Flood Risk Maps -
Implementation of European Pollutant Emission Register Data (EPER)
(in future Pollutant Release and Transfer Register - PRTR)
17. September 2008

19. no/partially specific flow (discharge)
Referat:
Oberflächengewässer, Hochwasserschutz
Table 4: Examples of Flood hazard map features
Bundesland
Hazard zones?
Water depth?
Water velocity?
Return periods
North Rhine-Westphalia No
yes
10-50, 100, years; extreme flooding
Baden-Württemberg no
10, 50, 100; extreme flooding
Saxony
no/partially specific flow (discharge)
20, 50, 100, 200 years; extreme flooding
Rhineland-Palatinate
partially
25, 50, 100, extreme flooding
17. September 2008

20. Table 5: Map scales used for flood hazard maps
Referat:
Oberflächengewässer, Hochwasserschutz
Table 5: Map scales used for flood hazard maps
Users
Scale
Basic information on map background
Map type
Regional planners
1:50,000 up to 1:100,000
Topographical maps with a scale of 1:25,000 up to 1:50,000
Regional plans
Local planners
1:1,000 up to 1:25,000
Topographical maps with a scale of 1:25,000
ATKIS DLM 25
Cadastral maps
Urban development land use plans
Development plans
Water management agencies
1:5,000 up to 1:10,000
Topographical maps
[German topographical maps with a 1:5,000 scale]; topographical maps with a 1:5,000 or 1:10,000 scale
Emergency planning agencies
Emergency alert and emergency action plan maps
Insurance sector
1:10,000
Topographical maps with a scale of 1:10,000
Zoning maps
17. September 2008

21. Referat:
Oberflächengewässer, Hochwasserschutz
6. Outlook
Bringing into force the laws, regulations and administrative provisions necessary to comply with the FRMD before 26/11/2009
Cooperation on River Basin and transnationally shared River Basin level
Continuation of technical work on Länder level with a view on Article 13
Continuation of technical work on HARM for coastal areas with a limited scenario
Integration of HARM into Disaster Management systems
Forward integration with air/ space based monitoring technologies/ systems
Interactive tools on operative municipal level
17. September 2008

22. Examples for Cooperation
Referat:
Oberflächengewässer, Hochwasserschutz
Examples for Cooperation
Within Germany and among Member States: Project FLIWAS
Flood Information and Warning System) with different partners such as: Land Baden–Württemberg, regional government of Karlsruhe, districts and municipalities (DE), City of Cologne (DE), STOWA (Lead-Partner, NL).
Among Member States: Project TIMIS Flood
Internet Map Information System on Flooding with a number of EU partners such as: Ministere de l‘Interieur et de l‘Amenagement du Territoire, Luxembourg (Lead Partner), Ministerium für Umwelt, Forsten und Verbraucherschutz, Rheinland-Pfalz (DE), Landesamt für Umwelt, Wasserwirtschaft und Gewerbeaufsicht, Rheinland-Pfalz (DE), Direction Regionale de l‘Environment, Lorraine, Metz (F), Service Navigation de Strasbourg (F), Landesanstalt für Umwelt, Messungen und Naturschutz Baden-Württemberg (DE), Municipality of Wittlich (DE)
17. September 2008

23. Examples for Cooperation
Referat:
Oberflächengewässer, Hochwasserschutz
Examples for Cooperation
Among Member States: Project SAFER
Strategies and Actions / Implementation for Flood Emergency Risk Management, based on Flood Hazard Maps, with a number of EU partners such as: Regierungspräsidium Stuttgart (Lead Partner, DE), Dublin City Council (IRE), Forestry Commission Scotland (UK), Ecole Polytechnique Fédérale Lausanne (CH)
17. September 2008

24. Referat:
Oberflächengewässer, Hochwasserschutz
FloodScan – a pilot study concerning the implementation of the directive 2007/60/EC in Bavaria
FloodScan - project overview:
supported by the EU Life Environment Programme
aims to develop precise, time and cost efficient technologies in the area of hydraulic 2d-modelling for the identification of flood plains and for the elaboration of flood hazard maps.
Duration: July 2006 – December 2009
Tasks and objectives:
 Refinement and simplification of data processing, use of new data bases
 Improvement of hydraulic 2d-modelling:
• use of original data, implementation of an improved web mapping service
• elaboration of requirements and specifications for the calculation of flood hazard maps
 Transferability – recheck of overall practicability of the methods and data
 Dissemination and Communication – implementation of communication and information instruments, evaluation of developed maps and services
 results assist to implement the directive 2007/60/EC
Bavarian Environment Agency
Bavarian Agency for Surveying and Geographic Information
Technische Universität München Chair of Forest and Environmental Policy
17. September 2008

25. Creating flood hazard maps
Referat:
Oberflächengewässer, Hochwasserschutz
Creating flood hazard maps
example for flood hazard maps created with hydraulic 2d-modelling
Blue colours: Association with water!
Bavarian Environment Agency
Bavarian Agency for Surveying and Geographic Information
Technische Universität München Chair of Forest and Environmental Policy
17. September 2008

26. Action Status Tracking
Referat:
Oberflächengewässer, Hochwasserschutz
INGE – Interactive Risk Map for the Municipal Flood Protection
maintain address data and action plans
maintain complete alarm escalation plans incl. related documents and pictures
maintain status and history of actual situation
display actual maps of affected objects for different scenarios
display predefined flood risk, flood hazard and municipal flood information maps
include individual water level gauges
INGE
Main Partitions:
GIS Component
Situation Query
Object Survey
Action Status Tracking
17. September 2008

27. - visualizes alarm escalation plans of municipals.
Referat:
Oberflächengewässer, Hochwasserschutz
- visualizes alarm escalation plans of municipals.
- provides a quick and comprehensive overview of endangered objects
- provides a quick and comprehensive overview of planned, processed and finalised measures (action status tracking)
- visual support of flood management through existing maps or photos of past flood events
The software INGE
“Interactive Risk Map for the Municipal Flood Protection”
17. September 2008