Risk Assessment and Risk Management in

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					                                             Integrate, Consolidate and Disseminate
                                  European Flood Risk Management Research

              ERA-NET CRUE Funding Initiative


Kick-off Meeting of Research Projects




          Risk Assessment and Risk Management in
             Small Urban Catchments
                          Erik Pasche




                                                Vienna, 29.-30.01.2007
                                                                                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
                                                                                   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 2nd July 2006 (Courtesy Heywood Advertiser)
                                                                                         Problem
                                                                          Small Urban Catchments

Structural Characterization

Transport of stormwater
and sewage water                                  Einzugsgebiet           Open space, farmland
                                                  Flurstücke
                                                  Gewässer
Remaining open space                              alter Gewässerverlauf
                                                  Verrohrung
used as farmland              Stormwater and sewage
                              water, managed separately
Brooks reduced to
technical channels



                                                                          Combined pipe network for
                                                                          sewage-and storm water
                                             Problem
                              Small Urban Catchments

Structural Characterization

Urban development ends
at the water course
                                                           Problem
                                            Small Urban Catchments

Hydrological Characterization

Fast reaction on
precipitation
                           Runoff
Short intensive floods

Formation of “Flash
Floods”
                                    Urban catchment



                                                 Natural
                                                 catchment


                                                             time
                                                       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
                                                                  Work Programme

Project structured in 4 work packages:

WP 1:   Relevance and requisites of the societal environment for non-structural flood
        measures
        WP-Leader: Nigel Lawson (Manchester University)
WP 2:   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
                                                                              Methods

  Inventory of data

WP 1:   regulatory, planning, societal, cultural and economic situation
        through interviews with         stakeholders,    analysis   of    archives   of
        governmental agencies
WP 2:   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
                                                               Methods

  Experimental Social Science Study

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

Demonstration of flood by symbols              flood animation centre




Flood Cylinder Model         Multimedia Show: movie with narrator       Haptic flood model
                                                                            Methods
                                                             Social Science Research

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

Focus Groups and ILGs   Neighbourhood workshops
                                                  Methods
                                   Non-Structural Measures

  Analysis and Evaluation

WP 2:   Technical and
        Administrative Framework
                                                                           Non-Structural Measures
                                                                Capacity Building in Spatial Planning

Analysis of existing urban spatial plans for building regulations, land use control
                                                                    Non-Structural Measures
                                                            Capacity Building of Stakeholders

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

Flood Preparedness through better resilience of the built environment
                                                                                                      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


                           Interpretation   Give actions in dependence of alarm type
Water authority
                           of data

                           Triggering of
Flood Centre               Alarms



District offices of                                          Control and operation of
water authority                                              flood defence system


Emergency services                                         Execution of preventive measures
(fire brigade)
                                                                                                         Non-Structural Measures
                                                                                        Capacity Building of Contingency Response

Emergency Services (preparedness - Hot spot map - and efficiency)


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                                                         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
                                                                              Outlook

Project Start:   01.01.2007

Milestones:
April 2007:      Review of state of the art, characterisation of urban catchments and
                 examination of planning and regulatory regimes
Sept. 2007:      Determination of flood risk awareness and readiness to accept non-
                 structural and ecological measures (interviews, focus groups and
                 ILGs)
Nov. 2007:       Analysis of data collected and interpretation of results


January 2008:    Final Report
                 Workshops on national and regional level