Mwa coldbrook frms & denbigh case study

Martin Wright Associates
Coastal & flood risk management engineers

Flood Risk Management and
Community Resilience

Coldbrook Flood Risk Management Scheme
Rob Evans, Principal Engineer

www.martinwrightassociates.com

Over 100
properties and 4
schools flooded

Extent for Coldbrook Catchment Flooding 20th July 2007 (Source: VoG PFRA)

Previous Flooding www.martinwrightassociates.com

Previous Flooding www.martinwrightassociates.com

Existing
inlet
structures

Example of a well designed inlet structure

Existing and Proposed Inlet Structures www.martinwrightassociates.com

Watercourse Capacity and Storage 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 – there is now a greater
focus on ensuring that the community at risk is fully aware of the
potential consequences of a flood.


HOLISTIC SOLUTION ADOPTED
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

FLOOD RESILIENCE – COLDBROOK CATCHMENT

• Press Releases
• Local advertising and leaflets
• Public Exhibitions and displays
• Website and Social Media
• Flood Risk School Workshops
• Community Flood Group
• Scheme signage
• Flood Risk Management Plan

RAISING PUBLIC AWARENESS www.martinwrightassociates.com

Awareness raising: leaflet www.martinwrightassociates.com

Awareness raising: website www.martinwrightassociates.com

Awareness raising: facebook www.martinwrightassociates.com


Flood Risk Management and
Community Resilience
A Case Study - Denbigh Flood Risk Management Scheme
Mike Wellington, Director


DENBIGH 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

DENBIGH FLOOD RISK MANAGEMENT SCHEME
• 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

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


Press release www.martinwrightassociates.com

Scheme sign board www.martinwrightassociates.com

Scheme logo www.martinwrightassociates.com

Car Parking Advertisement www.martinwrightassociates.com

Exhibitions www.martinwrightassociates.com

www.denbighflood.co.uk - Home www.martinwrightassociates.com

facebook www.martinwrightassociates.com

Twitter@DFRMS www.martinwrightassociates.com

Text Alerts www.martinwrightassociates.com

Community Action www.martinwrightassociates.com

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


How do you measure how effective it is?

Getting a baseline and monitoring
improvements using ACTIVOTE


Activote www.martinwrightassociates.com

Educational presentations www.martinwrightassociates.com

1. Options for solving flooding in Denbigh

2. What should be in a Personal Flood Plan?

3. What is in a flood kit?

Flood Risk Workshops www.martinwrightassociates.com

Flood Paths and Properties at Risk www.martinwrightassociates.com

Personal flood plan www.martinwrightassociates.com

Flood kit www.martinwrightassociates.com

Weather station www.martinwrightassociates.com

Cost of Damages
( taken from the FHRC multi-coloured manual)

www.denbighflood.co.uk

www.llifogydddinbych.co.uk

• Number of unique visitors: 1504

• Number of pages: 18,000

• Number of hits: 150,034

Scheme Website www.martinwrightassociates.com

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


Phase 3 starts Construction
on site work complete
Excavation of
thrust pits
Tunnelling Flooding advice
works sent to
residents


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

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

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

PERSONAL FLOOD PLANS (LEAST POPULAR ANSWERS)

1. Flood barrier


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 KITS (LEAST POPULAR ANSWERS)

1. Lifeboat

2. Armbands

3. Umbrella


Flood Risk on School Curriculum www.martinwrightassociates.com

• 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

Displays were set up throughout the town at:

• Denbigh Library

• Foyer of Denbighshire County Council Office

• Morrison Supermarket

• Post Office and General Store

• Community Centre

• Public Houses

Public Engagements - Displays www.martinwrightassociates.com

• Denbigh Business Group

• Rotary Group

• Community Group

• Identified Scheme Champions

Public Engagement – Community Groups www.martinwrightassociates.com

• Facebook 121 regular visitors

• Twitter 19 followers

• Text Alert: 15 subscribers

Social Media www.martinwrightassociates.com

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

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

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


For further information:
www.coldbrookflood.co.uk

or assistance please do not hesitate to contact:

01244 677656
mike@martinwrightassociates.com

Thank You www.martinwrightassociates.com

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