Flood Mapping Workshop

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Presentation transcript:

Flood Mapping Workshop Dublin, 17th to 19th September 2008 Where and how to do Preliminary flood risk assessment? Flood mapping must help to answer: the Czech Republic situation. Jan Daňhelka Czech Hydrometeorological Institute Na Sabatce 17, 143 06 Praha-Komorany, CZ e-mail: danhelka@chmi.cz Michaela Brejchova, Karel Drbal, Josef Reidinger

What has been done already in the CZ Historical floods OUTLINE What has been done already in the CZ Historical floods What is a significant risk? What is extreme flood? Some other issues of risk evaluation Reporting

Introduction Floods - the most important natural risk in the CZ heavy precipitation snow melting flash floods CZ area of 78 864 km2 76 000 km of streams 9 252 km of remarkable streams Water Act of the Czech Republic 254/2001Sb

Introduction FRD demands? PFRA outputs = maps and other information

Existing data and information Inundation areas Q5 Q20 Q100 active inundation River basin management plan of the Czech Republic (May 2007) preventive measures to reduce damage by flooding Chapter D of River Basin District Plans

Existing data and information Flood hazard and flood risk assessment methodology (Drbal et al., 2005) Project on further improvement of methods of flood risk and flood damages estimation including implementation of FRD. Information System Flood Resident (ISFR) number of residents aggrieved by Q100, Q20 PFRA - flood with high probability = Q20 - flood with medium probability = Q100 - flood with low probability = ?

Historical Floods Pre-instrumental period (before 1800) chronicles dates (August 1118, June 1432 etc.) magnitude? (since the time of Noah) inundation? (churches and streets that were flooded) flood marks (very few)

Historical Floods Instrumental period (1800 – 1980) historical measurements pictures, photographs flood marks reports

Historical Floods

Historical Floods Is inundation the same? - Mapping of flood protection and terrain changes.

What is a significant risk? No pan European criteria How to set some threshold? Potential damage (direct) Affected residents – first approximation other types of risks

What is a significant risk? Czech Republic Q100 90 381 buildings (88 000 used for living) 157 000 households 368 000 people (3,5 %) 1 499 municipalities 50 municipalities > 1 000 inhabitants 395 municipalities > 100 inhabitants. Olomouc - 35 624 Brno - 17 199 Prague - 14 935 Uherske Hradiste - 14 578

What is a significant risk?

What is a significant risk?

What is a significant risk?

What is a significant risk?

What is an extreme flood? FRD 2nd phase Q500 ? Probable maximum flood ? Historical flood extent ? Flood plain delimitation based on terrain or soil mapping ? Hydraulic modeling steady x unsteady flow design hydrograph confluences Verification over historical floods…

Other applications based on flood risk? Reinsurance brokers Flood damage models Flood extent flood depth in selected profiles (above the bankfull) interpolation along the stream precision? - important are large cities (damages) only! Intersect with insurance portfolio Apply damage functions (curves) Base for decision of billions of Euro business!

Reporting PFRA outputs Make available to GP Make available to the Commission CZ view Use existing databases and information systems in the CZ Reporting the work, not the full outputs

Common water management information portal Reporting Common water management information portal http://www.voda.gov.cz

Flood information system POVIS Reporting Flood information system POVIS http://www.povis.cz

Conclusion So, how flood mapping should support PFRA? use existing maps (Q100, Q20) help to define „significant risk“ threshold mapping (localization) of flood protection measures GIS procedures of flood plain delimitation? verification of historical flood inundation data Preparing the outputs of PFRA which in a fact are flood maps

THANK YOU FOR YOUR ATTENTION Flood Mapping Workshop Dublin, 17th to 19th September 2008 THANK YOU FOR YOUR ATTENTION Jan Daňhelka Research activities of CHMI in the field of CC impact on hydrology Czech Hydrometeorological Institute Na Šabatce 17, 143 06 Praha-Komořany, CZ e-mail: danhelka@chmi.cz