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Working Group F Thematic Workshop on Flood Mapping Dublin, 17 – 19 September 2008

Working Group F Thematic Workshop on Flood Mapping Dublin, 17 – 19 September 2008 Session 2: Meeting the flood hazard and risk mapping requirements of the “Floods” Directive MEETING THE FLOOD DIRECTIVE – THE ITALIAN APPROACH

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Working Group F Thematic Workshop on Flood Mapping Dublin, 17 – 19 September 2008

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  1. Working Group FThematic Workshop on Flood Mapping Dublin, 17 – 19 September 2008 Session 2: Meeting the flood hazard and risk mapping requirements of the “Floods” Directive MEETING THE FLOOD DIRECTIVE – THE ITALIAN APPROACH Prof. Giovanni MenduniSecretarygeneral - Arno River basin Authority – Italyg.menduni@adbarno.it – www.adbarno.it

  2. The “Italianroute” Major disasters (1951, 1966…) 1989 Wireframelaw on soilprotection 2007 CompletionofPAImosaic 1990 InstitutionofRBAs 1999 Preliminarymapping 1998 Disasterof "Sarno" 1998 Start ofPAI planning 1998 “Sarno” Law

  3. The “Italianmodel” in 5 headings (since 1989) Flood and landsliderisk and water resources defineanuniquethematic and management environment Everyactionhastobeconsidered withinanholistic planning activity. Planning processisopentoinstitutions and stakeholders. Planisfinallyapprovedby the Prime minister and has the forceof a State law. Onlyonesubject Planning as the mainissue Basin scale A “River basin authority” Twotimescales Watershedis the planning scale, regardlesstoadministrativeboundaries A specific “Authority” withbothregional and state componentsgoverns planning and budgeting Basin planning is a typical“deferredtime” scale action. “Realtime” actionisgovernedbyCivilProtection System.

  4. The RBAs (since 1989)

  5. The Plan ActionMonitoring Budgeting Data background: Topography Climate Geology Hydrology Hydraulics Historicalrecords Economics Demography …. Analisys, definitionoftargets and action planning Mappingishere

  6. National mapping programme Hazard: On 4 (sometimes 3)scenarios: From 20-50 to 500 ys.returnperiod. Hydraulicmodeling and hisotoricalrecords …. Exposureassessment Fordifferentscenarios Elements at risk Fromnumerical cartography Riskmapping intoclasses Scale from 1:25000 to 1:10000

  7. The case of Arno riverbasin: hazardmap

  8. Element at risk • From 1:10000 numerical (CADoriented) cartography: • Characterizationof • Over 600.000 building polygons • Infrastructures (e.g. roads, railroads, bridges…) • Land cover • On more than 100 types

  9. FlorenceRailway station [208] Platform San Lorenzo Market [202] Industrial/Commercial building Florence Railway station [211] Railway station Civil building [201] Civil/administrative Basilica di S. Maria Novella [203] Worship building in [226] religious area Conventof S. Maria Novella [201] Civill/Administrative in [226] religious area Battistero [203] Worship building in [226] religious area Tipizzazione di tutti i poligoni (oltre 600.000 nel bacino) relativi all’edificato della CTR, su circa 100 categorie Tipizzazione di strade, autostrade, ferrovie, elementi infrastrutturali strategici, cartografati in scala 1:10.000 Tutto in coerenza con la predisposizione del DB topografico per la nuova CTR

  10. Riskmapping

  11. Information to the public and data dissemination

  12. Information to the public and data dissemination

  13. Conclusion /1 Natural risks forced by climate in Italy are managed at the basin scale The tool is the Basin Plan continuously upgraded by RBAs. Preliminary H/R maps were produced in the nineties. A state law in 1998 started a national mapping programme and is now completed. Available flood hazard maps cover all flood prone areas in Italy generally according to four scenarios For each scenario at least flood extent is shown on the map while flow height or velocity fields are reported accordingly with the required level of detail and available data.

  14. Conclusion /2 These maps immediately meet the requirements of the Directive as “preliminary flood risk assessment product” to be concluded in 2011. The content of the maps, as far as hazard is concerned, also meets the “Flood mapping product” requirements deadlined in for 2013 after a nationwide coordination work Also flood risk maps may rapidly be aligned to meet the Directive requirements after nationwide coordination. In this case national guidelines have to be produced particularly on parametric estimations of demographic and economic data.

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