IPCC Special Report on the Ocean and Cryosphere in a Changing Climate: What's...
Mwa emergency chester uni 26 feb 2013
1. Martin Wright Associates
Coastal & flood risk management engineers
Flood Risk Management and
Community Resilience
Case Studies
Denbigh Flood Risk Management Scheme
West Rhyl Coastal Defence Scheme
www.martinwrightassociates.com
2. 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.
www.martinwrightassociates.com
3. 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
www.martinwrightassociates.com
4. 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
www.martinwrightassociates.com
5. HOLISTIC SOLUTION TO FLOOD RISK MANAGEMENT
TRADITIONAL NEW APPROACH (FLOOD RISK MANAGEMENT)
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 www.martinwrightassociates.com
6. 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 www.martinwrightassociates.com
7. 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 www.martinwrightassociates.com
8. 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.com
12. 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.com
14. 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.com
19. 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
www.martinwrightassociates.com
21. Areas at risk from coastal flooding www.martinwrightassociates.com
22. 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
www.martinwrightassociates.com
Improving Existing Infrastructure
26. 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.com
40. 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 www.martinwrightassociates.com
41. How do you measure how effective it is?
Getting a baseline and monitoring
improvements using ACTIVOTE
RAISING PUBLIC AWARENESS www.martinwrightassociates.com
45. 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?
Flood Risk Workshops www.martinwrightassociates.com
46. Flood Paths and Properties at Risk www.martinwrightassociates.com
55. Temporary
bridges
Phase 1 removed Phase 2
Starts on Road
Works in
site Closure
farmland
School Exhibition
Car park
visits start in library
adverts
go live
Denbigh Scheme Website www.martinwrightassociates.com
56. Phase 3 starts Construction
on site work complete
Excavation of
thrust pits
Tunnelling Flooding advice
works sent to
residents
Denbigh Scheme Website www.martinwrightassociates.com
57. 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.com
58. 1.2
1.0
0.8
P(d)
0.6
0.4 P normal
0.2 P data
0.0
0.0 0.5 1.0 1.5 2.0 2.5
• Number of points = n = 16 d(i)
• 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
Educational and School visits www.martinwrightassociates.com
59. 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 www.martinwrightassociates.com
60. PERSONAL FLOOD PLANS (LEAST POPULAR ANSWERS)
1. Flood barrier
Flood Risk Workshop Feedback www.martinwrightassociates.com
61. 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 www.martinwrightassociates.com
66. BTEC APPLIED SCIENCE
How human activities affect the Environment
Unit 1: Chemistry and Our Earth
Assignment 5
Affecting the Environment
Mike Wellington
Associate, Martin Wright Associates
April 2011
BTEC Chemisty www.martinwrightassociates.com
73. Displays were set up at:
• Libraries
• Foyers of Council Offices
• Supermarkets
• Post Office and General Store
• Community Centres
• Public Houses
Public Engagements - Displays www.martinwrightassociates.com
74. 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 www.martinwrightassociates.com
75. 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 www.martinwrightassociates.com
76. • Business Groups
• Rotary Group
• Community Groups
• Identified Scheme Champions
Public Engagement – Community Groups www.martinwrightassociates.com
77. 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 www.denbighflood.co.uk www.rhylcoast.co.uk
April 2010)
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
Social Media www.martinwrightassociates.com
78. 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.com
82. 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 www.martinwrightassociates.com
83. 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 www.martinwrightassociates.com
84. 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
www.martinwrightassociates.com
85. Martin Wright Associates
Coastal & flood risk management engineers
QUESTIONS ?
For further information:
www.martinwrightassociates.com
or assistance please do not hesitate to contact:
Martin Wright Associates
01244 677656
mike@martinwrightassociates.com
www.martinwrightassociates.com
Mike Wellington
Thank You www.martinwrightassociates.com
