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www.martinwrightassociates.com
Martin Wright AssociatesCoastal & flood risk management engineers
Flood Risk Management andCommunity Resilience
Case Studies Denbigh Flood Risk Management Scheme
West Rhyl Coastal Defence Scheme
www.martinwrightassociates.com
NEW APPROCHES TO FLOOD RISK MANAGEMENT
• Following widespread flooding in England in the Summer of 2007, (Gloucester) Sir Michael Pitt undertook review of flood defences in the England.
• Published in 2008 and made over 90 recommendations
• Both Welsh Assembly Government and DEFRA keen to adopt a more holistic approach to how we deal with flood risk.
• In addition to the traditional methods used to prevent flooding - such as building bigger and better defences now a greater focus on ensuring that the community at risk is fully aware of the potential consequences of a flood.
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RECOMMENDATIONS OF THE PITT REVIEW (ENGLAND)
• increasing interest in alternative sustainable adaptation measures, e.g. property resilience measures to enable a flexible approach to adaptation
• the public need to be aware of a flooding risk before they can take
action to minimise it
• the EA should work to raise awareness in flood risk areas identifying a range of mechanisms to warn the public, particularly the vulnerable, in response to flooding to reduce the impact of floods on individuals.
• levels of awareness should be raised through education and publicity programmes
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RECOMMENDATIONS OF THE PITT REVIEW (ENGLAND) • the public should make up a flood kit
• raising awareness of risks can build community resilience to flooding with a clear understanding of risk
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NEW APPROACH (FLOOD RISK MANAGEMENT)
TRADITIONAL
1) Improve existing infrastructure 1) Improve existing infrastructure
2) Increase built environment resilience
3) Raise public awareness
4) Enhance community resilience
5) Improve flood warnings
6) Better land use management
7) Improve emergency response/recovery
8) Develop better asset management
9) Collaboration with key stakeholders
10) Protect/enhance the environment
Flood Alleviation to Flood Risk Management
HOLISTIC SOLUTION TO FLOOD RISK MANAGEMENT
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NEW APPROACHES TO FLOOD RISK MANAGEMENT SCHEME
• No guidance from WAG or ‘toolbox’ regarding implementation of ‘New Approaches’
• Rural community with large percentage of vulnerable adults
• Community did not fully recognise or understand flood risk
• Barriers to flood awareness raising that need to be overcome
Challenges
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BARRIERS AND CHALLENGES
• Public apathy
• Denial of problem due to fears of property devaluation or inability to get insurance
• Lack of Knowledge
• Forgetting to act as serious flooding had not happened recently
• Lack of motivation
• Someone else’s problem
Barriers to awareness raising
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DENBIGH FLOOD RISK MANAGEMENT SCHEME• In 2002, Denbighshire County Council carried out a Pre-Feasibility Study of a
culverted watercourse (known as Henllan Brook) that flows through the town of Denbigh. The study focused on a specific length of the watercourse in the Lenten Pool area of the town where flooding is particularly prevalent and severe. • In February 2009, the Council made a successful bid to Welsh Assembly
Government (WAG) to be part of a Flood and Coastal Risk Management Programme that attracted European Union Convergence Funding • As a result the PAR was expanded to meet the aims and objectives of the
strategic WAG programme - which in turn have been developed to be consistent with;
a) WAG’s ‘New Approaches Programme’b) the recent Pitt Review and c) the European Union Directive on the assessment and management of flood
risks
www.martinwrightassociates.comHenllan Brook
www.martinwrightassociates.comHistoric Flooding in Denbigh
www.martinwrightassociates.comFlooding Lenten Pool – October 2001
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DENBIGH FLOOD RISK MANAGEMENT SCHEME
• Ordinary watercourse flowing through urban area
• Culverted on an ad-hoc basis over past 200 years
• Poor structural condition
• Limited maintenance regime
• Extensive commercial & residential development
• Regular and severe flooding
• 226 residential and 26 commercial properties at risk
Problem
www.martinwrightassociates.comCommunity Resilience
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REDUCING FLOOD RISK IN DENBIGH
TRADITIONAL
• 1,440m of new culverts ranging in size from 300mm to 2.1m x 1.0m
• Combination of open cut and tunnelling
• 635m of watercourse re-profiling and improvements
• Repair of existing culverts
• New screens
• New flood storage areas
Improving Existing Infrastructure
www.martinwrightassociates.comImproving Existing Infrastructure
www.martinwrightassociates.comImproving Existing Infrastructure
www.martinwrightassociates.comImproving Existing Infrastructure
www.martinwrightassociates.comImproving Existing Infrastructure
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WEST RHYL COASTAL DEFENCE SCHEME
• Existing defence in need of repair
• Climate change leading to increase in storminess
• Existing promenade level 6.5m AOD (ground level)
• Rhyl residential area 3.2 – 3.5m AOD
• New development not permitted in flood risk areas – regeneration
of West Rhyl
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www.martinwrightassociates.comAreas at risk from coastal flooding
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WEST RHYL COASTAL DEFENCE SCHEME
• Protect and enhance River Clwyd training wall with rock armour
• Vertical Sheet piles and wave return wall Inner Harbour
• Sheet pile toe and rock armour and wave return wall in Outer
Harbour
• Phase 3 currently under design review
Improving Existing Infrastructure
www.martinwrightassociates.comCivil Engineering works
www.martinwrightassociates.comCivil Engineering works
www.martinwrightassociates.comCivil Engineering works
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NEW APPROACH - ENGAGING THE LOCAL COMMUNITY
• Press Releases
• Scheme logo and signage
• Local advertising
• Public Exhibitions and displays
• Website and Social Media
• Flood Risk Workshops
• Weather centre
• Visualisations
RAISING PUBLIC AWARENESS
www.martinwrightassociates.comPress release
www.martinwrightassociates.comScheme sign boards
www.martinwrightassociates.comScheme logo
www.martinwrightassociates.comCar Parking Advertisement
www.martinwrightassociates.comDFRMS - Exhibitions
www.martinwrightassociates.comWRCDS - Exhibitions and displays
www.martinwrightassociates.comWRCDS – Visitors Centre
www.martinwrightassociates.comScheme website
www.martinwrightassociates.comfacebook
www.martinwrightassociates.comTwitter@DFRMS & @Rhyl_Coast
www.martinwrightassociates.comText Alerts
FOR TEXT ALERTS TEXT
“DENBIGH”OR
“RHYL” TO 60066
www.martinwrightassociates.comFact Sheets
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NEW APPROACH – EDUCATIONAL PRESENTATIONS
• School visits and Flood Risk Workshops
• Talks and interactive sessions
• Relating the scheme to the curriculum
• Questionnaires to take home to parents
• Competitions and prizes
• Weather centre
• Visualisations
RAISING PUBLIC AWARENESS
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How do you measure how effective it is?
Getting a baseline and monitoring improvements using ACTIVOTE
RAISING PUBLIC AWARENESS
www.martinwrightassociates.comActivote
www.martinwrightassociates.comActivote
www.martinwrightassociates.comEducational presentations
www.martinwrightassociates.comFlood Risk Workshops
1. Areas at Risk of flooding & Options for solving
flooding in Denbigh or Coastal defence options
2. What should be in a Personal Flood Plan?
3. What is in a flood kit?
www.martinwrightassociates.comFlood Paths and Properties at Risk
www.martinwrightassociates.comPersonal flood plan
www.martinwrightassociates.comPersonal flood plan
www.martinwrightassociates.comFlood kit
www.martinwrightassociates.comWeather station
www.martinwrightassociates.comWeb based weather stations
www.martinwrightassociates.comCost of Damages
( taken from the FHRC multi-coloured manual)
www.martinwrightassociates.comVisualisation
www.martinwrightassociates.comVisualisation
www.martinwrightassociates.comDenbigh Scheme Website
Phase 1 Starts on site
Phase 2 Road Closure
Temporary bridges removed
Works in farmland
Car park adverts go live
Exhibition in library
School visits start
www.martinwrightassociates.comDenbigh Scheme Website
Excavation of thrust pits
Phase 3 startson site
Tunnelling works
Flooding advicesent to residents
Construction work complete
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Flood Risk Workshops
• 540 pupils actively involved
• By using the activote system it was possible to get instant feedback, 1 mark was awarded for the correct answer
• At the end of each session two sets of average scores were recorded
• A null hypothesis of:
“no difference in respondent’s awareness of flooding after participating in a flood risk workshop” was used.
Educational and School visits
www.martinwrightassociates.comEducational and School visits
0.0
0.2
0.4
0.6
0.8
1.0
1.2
0.0 0.5 1.0 1.5 2.0 2.5
d(i)
P(d)
P normalP data
• Number of points = n = 16• Standard error of the sample = s = σd/√n = 0.570/4 = 0.143• Number of degrees of freedom = DF = n-1 = 16-1 = 15• Let D be the mean value of d(i) in the whole population; in order to find out the
probability that D<0• t = (μd – D)/SE = (1.369 – 0)/0.143 = 9.605 with 15 degrees of freedom• P(T) from this result is approximately equal to unity and therefore we can reject
the null hypothesis H0: μd <= 0; in fact, even t15,0.005 is only 2.947<< 9.605
• Concluding that the Flood Risk Workshop are highly effective at raising awareness
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PERSONAL FLOOD PLANS (MOST POPULAR ANSWERS)
1. Contact members of the family and friends to ensure that they are safe
2. Contact details of the council, EA and Emergency Services
3. Have some sandbags ready in case of a flood
4. Make sure that you have insurance
5. Move valuables upstairs (or backup personal information or sentimental photographs to the internet)
Flood Risk Workshop Feedback
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PERSONAL FLOOD PLANS (LEAST POPULAR ANSWERS)
1. Flood barrier
Flood Risk Workshop Feedback
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FLOOD KITS (MOST POPULAR ANSWERS)
1. Food and water
2. Torch
3. First Aid Kit
4. Mobile phones
5. Life jacket
6. Camera
7. Radio
Flood Risk Workshop Feedback
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FLOOD KITS (LEAST POPULAR ANSWERS)
1. Lifeboat
2. Armbands
3. Umbrella
Flood Risk Workshop Feedback
www.martinwrightassociates.comFlood Risk on School Curriculum
www.martinwrightassociates.comFlood Risk on School Curriculum
www.martinwrightassociates.comTaking the message home
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BTEC APPLIED SCIENCEHow human activities affect the Environment
Unit 1: Chemistry and Our EarthAssignment 5Affecting the Environment
Mike WellingtonAssociate, Martin Wright Associates
April 2011
BTEC Chemisty
www.martinwrightassociates.comGeography field trip
www.martinwrightassociates.comArt & Design
www.martinwrightassociates.comGrafiti Art
www.martinwrightassociates.comGrafiti Art
www.martinwrightassociates.comGrafiti Art
www.martinwrightassociates.comSand Castle Competiton
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Displays were set up at:
• Libraries
• Foyers of Council Offices
• Supermarkets
• Post Office and General Store
• Community Centres
• Public Houses
Public Engagements - Displays
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DENBIGH FLOOD RISK MANAGEMENT SCHEME
• A register of local events was compiled
• Events attended included:
Denbigh Show
Denbigh Plum Festival
Denbigh Heritage Festival
St David’s Day Festival
Denbigh Past, Present & Future
• 1600 members of the community engaged
Public Engagement Exhibitions
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WEST RHYL COASTAL DEFENCE SCHEME
• Events included:
• Denbighshire Flood Awareness Event (500)
• Rhyl Air Show (3000 tourists)
• Visitor Centre on site – 1350 visitors
• ? members of the community engaged
Public Engagement Exhibitions
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• Business Groups
• Rotary Group
• Community Groups
• Identified Scheme Champions
Public Engagement – Community Groups
www.martinwrightassociates.comSocial Media
Social Media Denbigh FRMS West Rhyl CDS
Facebook 121 regular visitors 15o regular visitors
Twitter 19 followers 31 followers
Text Alerts 15 Subscribers 45 Subscribers
Website (from April 2010)
www.denbighflood.co.uk www.rhylcoast.co.uk
Unique Visitors 1504 1868
No of pages 18,000 29,266
No of hits 150,034 172,797
Welsh site www.llifogydddinbych.co.uk www.arfordiryrhyl.co.uk
Unique Visitors 1,119 200
Youtube 192 views of scheme videos
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SCHEME LEGACY
How do you ensure public awareness and resilience is maintained? How long lasting is a public awareness campaign?
Flood Risk Management Plan
1. Understanding the Existing Risk and Potential Consequences to the Community
2. Measures to Manage Risk
3. Managing Future Risks – Action Plan
4. Technical Summary
FLOOD RISK MANAGEMENT PLAN
www.martinwrightassociates.comPrior to scheme
www.martinwrightassociates.comCommunity Action
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www.martinwrightassociates.com
RECOMMENDATIONS
• Flood awareness & resilience included in the National Curriculum
• Funding for continuing awareness raising (post scheme) ring fenced
• Consideration given to reducing design standards from 1 in 100 yr (plus 20% for climate change) to a lesser standard for the construction of new defences but use awareness and resilience measures to make up shortfall
• Funding for design and development of schemes should be made available to enable better forward planning
Flood Risk Management
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RECOMMENDATIONS
• Flood risk management plans a mandatory operational tool linked to the MARP, could be similar to CDM Health and Safety file
• Development of modern technology to reach wider community including socially excluded and vulnerable members of society
• Use of social media is relatively inexpensive and should be developed to become the standard
Flood Risk Management
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Effect of ‘new’ legislation and responsibilities• The Water Industry (Adoption of Private Sewers Regulations 2011)
• Flood & Water Management Act 2010 requires Local Authorities to: take the lead in managing the risk of all local floods investigate flood events and publish results develop, maintain and apply a local flood risk strategy establish and maintain a register of structures & features relevant
to flood risk designate structures that are relevant to flood risk build partnerships and ensure effective multi-agency working approve, adopt and maintain SuDS on new developments ensure flood resilience is incorporated into new buildings
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Martin Wright AssociatesCoastal & flood risk management engineers
Thank You
For further information:
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or assistance please do not hesitate to contact:
Martin Wright Associates01244 677656mike@martinwrightassociates.comwww.martinwrightassociates.com
Mike Wellington
QUESTIONS ?
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