Preliminary Flood Preliminary Flood Risk AssessmentRisk Assessment

in Relation toin Relation toThe ProjectThe Project

of Flood Directiveof Flood Directive

Marcin Jacewicz Marcin Jacewicz

Regional Board for Water Management Regional Board for Water Management inin Gdańsk Gdańsk

IntroductionIntroduction

EU Flood Directive – flood risk EU Flood Directive – flood risk managementmanagement

Conscious, planned decision making Conscious, planned decision making process for the purpose of flood risk process for the purpose of flood risk decreasedecrease

GIS – Geographic Information System – GIS – Geographic Information System – the tool for the analysisthe tool for the analysis

Flood Risk MapsFlood Risk Maps EXCIMAP (European exchange circle on EXCIMAP (European exchange circle on

flood mapping) to elflood mapping) to elaaborate guide of good borate guide of good practices of flood mapping in Europepractices of flood mapping in Europe

Three Steps of WorkThree Steps of Work

Preliminary flood risk Preliminary flood risk assessment mapsassessment maps

Flood hazard mapsFlood hazard maps Flood risk maps.Flood risk maps.

Preliminary flood risk Preliminary flood risk assessmentassessment

First step – three yearsFirst step – three years Objective – to indicate flood risk areas Objective – to indicate flood risk areas

where further steps will be takenwhere further steps will be taken „„Flood risk is the combination of Flood risk is the combination of

the probability of a flood event and the probability of a flood event and of the potential adverse of the potential adverse consequences to human health, consequences to human health, the environment and economic the environment and economic activity associated with a flood” activity associated with a flood” (Flood Directive)(Flood Directive)

QuestionsQuestions

How to indicate flood risk areas?How to indicate flood risk areas? What information do we have?What information do we have? How can we collect dispersed How can we collect dispersed

information?information? How to evaluate risk?How to evaluate risk? Who will do it?Who will do it? How much time do we have?How much time do we have? How much it will cost?How much it will cost?

How to indicate flood How to indicate flood risk areas?risk areas?

Indicated areas will be further the subject of Indicated areas will be further the subject of expensive studies for hazard and thenexpensive studies for hazard and then risk risk maps elaborationmaps elaboration

Not indicated areas may implicate Not indicated areas may implicate consequences of unexpected risk and flood consequences of unexpected risk and flood impact to this areasimpact to this areas

Analysis shall consider cost and available time Analysis shall consider cost and available time of preparation (3 years)of preparation (3 years)

We have to collect as much as possible of We have to collect as much as possible of existing data and then make a decision where existing data and then make a decision where the risk is high, medium and lowthe risk is high, medium and low

What information do we What information do we have? have?

Information about historical floodsInformation about historical floods Studies for flood protectionStudies for flood protection ArchivesArchives LongLong term prognosisterm prognosis Research ProjectsResearch Projects Information about current and future Information about current and future

land useland use Special hazardsSpecial hazards TopographyTopography Another dispersed dataAnother dispersed data

Data sourcesData sources Regional Boards of Water Mangement (RZGW)Regional Boards of Water Mangement (RZGW) Boards of Reclamation (ZMiUW)Boards of Reclamation (ZMiUW) Institutes of Meteorology and Water Institutes of Meteorology and Water

Management (IMGW)Management (IMGW) Maritime OfficesMaritime Offices Research Institutes (IBW PAN, PGI, …)Research Institutes (IBW PAN, PGI, …) Local governmentsLocal governments Centra Zarządzania KryzysowegoCentra Zarządzania Kryzysowego (Prevention (Prevention

Management Centers)Management Centers) Fire BrigadesFire Brigades CitizensCitizens OtherOther

ConclusionConclusion

Information is dispersedInformation is dispersed It is not possible to manage such It is not possible to manage such

informationinformation This information shall be collected within This information shall be collected within

one manageable GIS data baseone 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 How can we collect dispersed information?dispersed information?

First step is to inform and aware all stakeholders First step is to inform and aware all stakeholders about advantages ofabout advantages of flood risk management and flood risk management and engage them to collaboration.engage them to collaboration. All shall understand All shall understand their responsibility for data sharing.their responsibility for data sharing.

Second is to establish a tool simple to use for Second is to establish a tool simple to use for making it.making it.

The information can be collected easier The information can be collected easier by by using using well designed internet portalwell designed internet portal

This portal shall give opportunity This portal shall give opportunity for for anyone, even anyone, even inexperienced, to introduce to the GIS geodatabaseinexperienced, to introduce to the GIS geodatabase anyany flood information by simple clicking flood information by simple clicking

Data sharing have to be obligatory for main Data sharing have to be obligatory for main institutional stakeholders ainstitutional stakeholders annd voluntary for another.d voluntary for another.

Historical FloodsHistorical Floods

Flood Protection StudyFlood Protection Study

Data Data evaluationevaluation

Then after we will have fragments of Then after we will have fragments of rivers and coast lines where flood is rivers and coast lines where flood is possible.possible.

There is a question of data reliability There is a question of data reliability criteriacriteria The source where data come fromThe source where data come from Data recurrenceData recurrence Data before changesData before changes

According this criteria According this criteria wwe can produce e can produce flood probabilityflood probability

How to evaluate risk?How to evaluate risk?

Risk = probability x consequencesRisk = probability x consequences Consequences we can for this Consequences we can for this

preliminary assessment evaluate on preliminary assessment evaluate on the basis of the map of land usethe basis of the map of land use

For example data from Corine Land For example data from Corine Land Cover Cover ProjectProject

Land use by Corine Land Land use by Corine Land CoverCover

The resultThe result

Who will do it?Who will do it?

The idea of multiThe idea of multi branch Project branch Project with participation of stakeholderswith participation of stakeholders

Geodatabase location – Regional Geodatabase location – Regional Boards for Water ManagementBoards for Water Management

Before, kick off meetings to establish Before, kick off meetings to establish Project definition, Project definition, Team Team ScheduleSchedule Budget Budget

No timeNo time

No moneyNo money

To be continued…To be continued…

Flood hazard mapsFlood hazard maps

Flood risk mapsFlood risk maps