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Preliminary Flood Risk Assessment in Relation to The Project of Flood Directive. Marcin Jacewicz Regional Board for Water Management in Gdańsk. Introduction. EU Flood Directive – flood risk management Conscious, planned decision making process for the purpose of flood risk decrease

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preliminary flood risk assessment in relation to the project of flood directive

Preliminary Flood Risk Assessmentin Relation toThe Projectof Flood Directive

Marcin Jacewicz

Regional Board for Water Management in Gdańsk

introduction
Introduction
  • EU Flood Directive – flood risk management
  • Conscious, planned decision making process for the purpose of flood risk decrease
  • GIS – Geographic Information System – the tool for the analysis
  • Flood Risk Maps
  • EXCIMAP (European exchange circle on flood mapping) to elaborate guide of good practices of flood mapping in Europe
three steps of work
Three Steps of Work
  • Preliminary flood risk assessment maps
  • Flood hazard maps
  • Flood risk maps.
preliminary flood risk assessment
Preliminary flood risk assessment
  • First step – three years
  • Objective – to indicate flood risk areas where further steps will be taken
  • „Flood risk is the combination of the probability of a flood event and of the potential adverse consequences to human health, the environment and economic activity associated with a flood” (Flood Directive)
questions
Questions
  • How to indicate flood risk areas?
  • What information do we have?
  • How can we collect dispersed information?
  • How to evaluate risk?
  • Who will do it?
  • How much time do we have?
  • How much it will cost?
how to indicate flood risk areas
How to indicate flood risk areas?
  • Indicated areas will be further the subject of expensive studies for hazard and thenrisk maps elaboration
  • Not indicated areas may implicate consequences of unexpected risk and flood impact to this areas
  • Analysis shall consider cost and available time of preparation (3 years)
  • We have to collect as much as possible of existing data and then make a decision where the risk is high, medium and low
what information do we have
What information do we have?
  • Information about historical floods
  • Studies for flood protection
  • Archives
  • Longterm prognosis
  • Research Projects
  • Information about current and future land use
  • Special hazards
  • Topography
  • Another dispersed data
data sources
Data sources
  • Regional Boards of Water Mangement (RZGW)
  • Boards of Reclamation (ZMiUW)
  • Institutes of Meteorology and Water Management (IMGW)
  • Maritime Offices
  • Research Institutes (IBW PAN, PGI, …)
  • Local governments
  • Centra Zarządzania Kryzysowego (Prevention Management Centers)
  • Fire Brigades
  • Citizens
  • Other
conclusion
Conclusion
  • Information is dispersed
  • It is not possible to manage such information
  • This information shall be collected within one manageable GIS data base

One of the general objectives for the preliminary risk assessment is to establish unique geodatabase placing all available flood information on the map.

how can we collect dispersed information
How can we collect dispersed information?
  • First step is to inform and aware all stakeholders about advantages offlood risk management and engage them to collaboration.All shall understand their responsibility for data sharing.
  • Second is to establish a tool simple to use for making it.
  • The information can be collected easier by using well designed internet portal
  • This portal shall give opportunity for anyone, even inexperienced, to introduce to the GIS geodatabase any flood information by simple clicking
  • Data sharing have to be obligatory for main institutional stakeholders and voluntary for another.
data evaluation
Data evaluation
  • Then after we will have fragments of rivers and coast lines where flood is possible.
  • There is a question of data reliability criteria
    • The source where data come from
    • Data recurrence
    • Data before changes
  • According this criteria we can produce flood probability
how to evaluate risk
How to evaluate risk?
  • Risk = probability x consequences
  • Consequences we can for this preliminary assessment evaluate on the basis of the map of land use
  • For example data from Corine Land Cover Project
who will do it
Who will do it?
  • The idea of multibranch Project with participation of stakeholders
  • Geodatabase location – Regional Boards for Water Management
  • Before, kick off meetings to establish
    • Project definition,
    • Team
    • Schedule
    • Budget
to be continued

To be continued…

Flood hazard maps

Flood risk maps