Mwa emergency chester uni 26 feb 2013

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


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.


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


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


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


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


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


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


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


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





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.comAreas at risk from coastal flooding



• 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




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.comwww.denbighflood.co.uk - Home

http://www.denbighflood.co.uk/

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


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


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


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


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


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


www.martinwrightassociates.comFlood Risk on School Curriculum

www.martinwrightassociates.comFlood Risk on School Curriculum

www.martinwrightassociates.comTaking the message home


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.comSand Castle Competiton


Displays were set up at:

• Libraries

• Foyers of Council Offices

• Supermarkets

• Post Office and General Store

• Community Centres

• Public Houses

Public Engagements - Displays


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



• 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


• 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

http://www.denbighflood.co.uk/

http://www.rhylcoast.co.uk/

http://www.llifogydddinbych.co.uk/

http://www.arfordiryrhyl.co.uk/

http://www.arfordiryrhyl.co.uk/


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



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


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


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


Martin Wright AssociatesCoastal & flood risk management engineers

Thank You

For further information:


or assistance please do not hesitate to contact:

Martin Wright Associates01244 677656mike@martinwrightassociates.comwww.martinwrightassociates.com

Mike Wellington

QUESTIONS ?

http://www.martinwrightassociates.com/

Documents

Mwa emergency chester uni 26 feb 2013