ERA-NET CRUE Funding Initiative. Risk Assessment and Risk Management in Small Urban Catchments

Transcription

1 ERA-NET CRUE Funding Initiative Integrate, Consolidate and Disseminate European Flood Risk Management Research Kick-off Meeting of Research Projects Risk Assessment and Risk Management in Small Urban Catchments Erik Pasche Vienna,

2 Partners Erik Pasche, River & Coastal Engineering, Hamburg University of Technology, Germany Ian Douglas, Nigel Lawson, School of Environment and Development, University of Manchester, England Richard Ashley, Pennine Water Group, University of Sheffield, England Daniel Schertzer, Centre d Enseignement Recherche Eau Ville Environment (CEREVE), École Nationale des Ponts et Chaussées, Marne-la- Vallee. France Risk Assessment and Risk Management in Small Urban Catchments

3 Problem Small Urban Catchments Structural Characterization High rate of urban development High percentage of sealed surface Drainage of the area by pipes Natural watercourses are hidden in culverts, pipes Pilsworth Rd. Heywood 2 nd July 2006 (Courtesy Heywood Advertiser)

4 Problem Small Urban Catchments Structural Characterization Transport of stormwater and sewage water Remaining open space used as farmland Brooks reduced to technical channels Stormwater and sewage water, managed separately Einzugsgebiet Flurstücke Gewässer alter Gewässerverlauf Verrohrung Open space, farmland Combined pipe network for sewage-and storm water

5 Problem Small Urban Catchments Structural Characterization Urban development ends at the water course

6 Problem Small Urban Catchments Hydrological Characterization Fast reaction on precipitation Short intensive floods Runoff Formation of Flash Floods Urban catchment Natural catchment time

7 Objectives of the Research Project Small Urban Catchments Contribution to the development of a methodological framework for flood management in small urban catchments Based on case studies (cities of Bradford, Glasgow, Manchester, Hamburg, Köln, Dresden and Paris) The effectiveness and efficiency of non-structural measures to reduce flood damage will be analysed and evaluated with respect to The feasibility of assessing and mitigating flood risk from hidden watercourses and associated culverts in urban areas. The possibilities and ways to implement effective, non-structural solutions to minimise flooding from these sources. The value of daylighting urban streams by removing culverts and restoring open channels that include space for flood storage

8 Work Programme Project structured in 4 work packages: WP 1: WP 2: Relevance and requisites of the societal environment for non-structural flood measures WP-Leader: Nigel Lawson (Manchester University) Structure and Efficiency of non-structural measures in small urban catchments WP-Leader: Richard Ashley (Sheffield University) WP 3: Flood Risk Management Strategies for small urban catchments WP-Leader: Erik Pasche (Hamburg University of Technology) WP 4: Coordination and Final Reporting WP-Leader: Erik Pasche and Nigel Lawson

9 Methods Inventory of data WP 1: WP 2: regulatory, planning, societal, cultural and economic situation through interviews with stakeholders, analysis of archives of governmental agencies examples of non-structural measures in urban catchments throughout Europe and Northern America through a desk study, In some cases a walk-over of sites will be organized and interviews with key decision makers WP 3: hydrological and geographical characterization of small urban catchments through direct acquisition from the relevant administrative institutions, storage and management of the data by a Open GIS-system

10 Methods Experimental Social Science Study WP 1: raising risk awareness and private participation through focus groups and interactive learning groups

11 Methods Social Science Research Demonstration of flood by symbols flood animation centre Flood Cylinder Model Multimedia Show: movie with narrator Haptic flood model

12 Methods Social Science Research Demonstration of flood by symbols flood animation centre Flood Cylinder Model

13 Methods Social Science Research Focus Groups and ILGs Neighbourhood workshops

14 Methods Non-Structural Measures Analysis and Evaluation WP 2: Technical and Administrative Framework

15 Non-Structural Measures Capacity Building in Spatial Planning Analysis of existing urban spatial plans for building regulations, land use control

16 Non-Structural Measures Capacity Building of Stakeholders Raising Risk Awareness through better information (inundation maps, risk maps)

17 Non-Structural Measures Capacity Building of Stakeholders Flood Preparedness through better resilience of the built environment

18 Non-Structural Measures Capacity Building of Stakeholders Flood Preparedness through better alarming services (flood alarm plans and flood alarm centres) Precipitation forecast Soil moisture forecast Forecast of water levels and discharges Water authority Interpretation of data Give actions in dependence of alarm type Flood Centre Triggering of Alarms District offices of water authority Control and operation of flood defence system Emergency services (fire brigade) Execution of preventive measures

19 Non-Structural Measures Capacity Building of Contingency Response Emergency Services (preparedness - Hot spot map - and efficiency) $T $T $T $T $T $T $T $T $T $T $T $T Überschwemmung $T Böschungsschaden Damage at watercourse Abflussmessstelle Bottle neck

20 Methods Flood Risk Management Strategies Analysis and Evaluation WP 3: methods to support the decision making process objective techniques to assess the interest and efficiency of non-structural measures to evaluate the efficiency of sustainable drainage, opening of culverts and restoration of natural rivers to attenuate flood waves and to reduce the damage

21 Outlook Project Start: Milestones: April 2007: Sept. 2007: Nov. 2007: Review of state of the art, characterisation of urban catchments and examination of planning and regulatory regimes Determination of flood risk awareness and readiness to accept non- structural and ecological measures (interviews, focus groups and ILGs) Analysis of data collected and interpretation of results January 2008: Final Report Workshops on national and regional level