flood evacuation management plan - · pdf file · 2017-05-21flood evacuation...

Site Reference Client Name

Flood Evacuation Management Plan

Ocean House, Crawley

P4i Limited

SHF.1190.004.HY.R.02.B


Contact Details:

Enzygo Ltd. Samuel House 5 Fox Valley Way Stocksbridge Sheffield S36 2AA

tel: 0114 321 5151 email: [email protected]

www.enzygo.com

Ocean House Crawley

Project:

Flood Evacuation Management Plan

For:

P4i Limited

Status:

Issued

Date:

August 2016

Author: Scott Dawson BSc (Hons), MSc, MCIWEM – Environmental Consultant

Reviewer: Daniel Alstead BSc (Hons), MSc, MCIWEM, C.WEM – Principal Hydrologist

Approver: Matt Travis, BSc (Hons), MSc, MCIWEM, C.WEM, CEnv, CSci - Director

Disclaimer:

This plan has been produced by Enzygo Limited within the terms of the contract with the client and taking account of the resources devoted to it by agreement with the client.

We disclaim any responsibility to the client and others in respect of any matters outside the scope of the above.

This plan is confidential to the client and we accept no responsibility of whatsoever nature to third parties to whom this plan, or any part thereof, is made known. Any such party relies on the plan at their own risk.

Enzygo Limited Registered in England No. 6525159 Registered Office Stag House Chipping Wotton-Under-Edge Gloucestershire GL12 7AD


SHF.1190.004.HY.R.02.B i Ocean House, Crawley

August 2016

Document Control

This Plan is owned by and is the responsibility of the Management Company of Ocean House to be

updated if required.

This plan should be reviewed

• Every 3 years following first occupation or;

• As a result of lessons identified following a flood event or exercise, or;

• Following changes of ownership/use of the property or;

• Following changes to the Flood Warning process.

Signed:

Dated:

Version No: 1


SHF.1190.004.HY.R.02.B ii Ocean House, Crawley

August 2016

Contents

Document Control ......................................................................................................................... i Contents ....................................................................................................................................... ii Tables & Figures ........................................................................................................................... iii 1.0 Purpose of the plan ............................................................................................................. 1

1.1 Background ....................................................................................................................... 1

2.0 Introduction to the Site ....................................................................................................... 2 2.1 Site Location ...................................................................................................................... 2

2.2 Background to the site ...................................................................................................... 2

2.3 Current Flood Risk ............................................................................................................. 2

2.4 Site Location ...................................................................................................................... 3

2.5 Methods of Communication on Site ................................................................................. 3

3.0 Communications Plan and Evacuation Procedure ................................................................ 5 3.1 Safe Exit ............................................................................................................................. 5

3.2 Actions .............................................................................................................................. 5

3.3 Safe Evacuation Route ...................................................................................................... 5

4.0 Flood Warning Activation Procedures ................................................................................. 8 5.0 Role of Other Bodies ......................................................................................................... 17

5.1 Other Bodies ................................................................................................................... 17

5.2 Environment Agency (EA) ............................................................................................... 17

5.3 MET Office ....................................................................................................................... 17

5.4 Sussex Police ................................................................................................................... 17

5.5 West Sussex Fire & Rescue ............................................................................................. 18

5.6 Crawley Borough Council ................................................................................................ 18

5.7 Utility Companies ............................................................................................................ 18

6.0 Flood Risk .......................................................................................................................... 19 6.1 Flood Risk ........................................................................................................................ 19

Appendix 1 – Site Specific Communications, Traffic and Command Structure .............................. 22 Appendix 2 – Emergency Contact Numbers ................................................................................. 23


SHF.1190.004.HY.R.02.B iii Ocean House, Crawley

August 2016

Tables & Figures

Figure 2.1. Site Location ......................................................................................................................... 3

Figure 3.1 - Safe Exit Plan ........................................................................................................................ 7


SHF.1190.004.HY.R.02.B 1 Ocean House, Crawley

August 2016

1.0 Purpose of the plan

1.1 Background

1.1.1 The Flood Evacuation Management Plan (FEMP) sets out the flood risk of the site, identifies the roles and responsibilities of the Flood Wardens, provides details of the proposed flood actions and sets out the roles and responsibilities of other bodies as well as providing contact details.

1.1.2 It is seen as a positive step in protecting the lives and property of occupants of the site, however, the specifics regarding timing of evacuation and any suggested evacuation routes and actions may be overruled by the emergency services should they attend any flooding incident on the site.

1.1.3 The FEMP is a ‘living’ document and therefore should be periodically reviewed and updated to provide advice and guidance to staff, occupants and visitors in the event of an extreme flood.

1.1.4 The advice of the emergency services should be followed at all times and on the ground decisions will supersede this FEMP. Where information is not available from the relevant authorities this FEMP is intended to provide action points to protect property and allow early, safe evacuation from this site.



August 2016

2.0 Introduction to the Site

2.1 Site Location

2.1.1 Ocean House, Crawley is located and accessed off Hazelwick Avenue, Crawley, West Sussex, RH10 1NP. The National Grid Reference of the site is 528682, 137152.

2.2 Background to the site

2.2.1 The building of the former Ocean House office complex and has been converted to a number of residential flats over three floors with a further floor (ground floor) as under-croft car parking.

2.3 Current Flood Risk

Statutory Flood Risk

2.3.1 The site is located within the vicinity of a fluvial flooding source (i.e. Gatwick Stream), flows in a northerly direction along the eastern boundary of the site.

2.3.2 The Environment Agency online flood map, shows that the site is located largely within Flood Zone 2; between the 1:100yr and 1:1000yr (<1% to >0.1% AEP) risk of fluvial (river) flooding, which is considered to be at ‘medium’ risk.

2.3.3 There also appears to be an element of Flood 3 located to the west of the site. Flood Zone 3 is located within the extent of the 1:100yr (1% AEP) risk of fluvial flooding, which is considered to be ‘high’ risk.

Secondary Sources of Flooding

2.3.4 Groundwater flooding has been identified as a secondary flooding source in the Level 1 Screening Study of the FRA which may pose a small risk to the site.

2.3.5 The secondary flooding source identified above will be dealt with by the existing drainage system. This source would only inundate the site to a relatively low water depth and water velocity, will only last a short period of time, in very extreme cases and will not have an impact on the whole of the site.

Further mitigation for any flooding from this source may be provided by the use of Aqua-Sacs® or sandbags held on site. Deployment of these will help to prevent surface water encroaching vulnerable locations.

Residual Risk – Breaches

2.3.6 There are no flood defences offering protection to the Site thus there is no risk of breach event occurring.

Vulnerability and Flood Warning

2.3.7 The development is classified as ‘more vulnerable’. More vulnerable uses are appropriate within Flood Zones 1, 2 and 3 after the completion of a satisfactory FRA. As such, a Flood Evacuation Management Plan (FEMP) has been prepared to accompany the FRA (as a standalone plan).

2.3.8 The site lies within the following Flood Alert/Warning areas:



August 2016

Flood Alert – Ifield Brook, Upper River Mole, Gatwick Stream, Burstow Stream and Salfords Stream

Flood Warning – Gatwick Stream at Maidenbower and Crawley.

2.4 Site Location

2.4.1 The site has one access and egress route to the west onto Hazelwick Avenue.

Figure 2.1. Site Location

2.5 Methods of Communication on Site

2.5.1 All site residents’ mobile numbers are registered with the Environment Agency’s Floodline Warnings Direct service. Any new residents should be made aware by the vendor of the requirement to register for the service and copy of the FEMP handed down with the deeds to the property stating the obligations of the owner to themselves and other residents should they become landlords.



August 2016

2.5.2 Landlords of property within the Site will have an obligation to their tenants to ensure they are instructed to register for the service and be provided with a copy of the FEMP.



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3.0 Communications Plan and Evacuation Procedure

3.1 Safe Exit

3.1.1 The Safe Exit Plan shown in Figure 3.2 indicates the exit routes that all people (i.e. residents and visitors) on site should follow once a SEVERE FLOOD WARNING has been received. The evacuation of the Site would commence, in accordance with the staged areas, as detailed in Figure 3.1. The order of evacuation for these areas is outlined in the appended in the Site Specific Communication and Evacuation Procedure (Appendix 1).

3.1.2 For clarity, there are three levels of flood warning issued by the Environment Agency:

Flood Alert

Flood Warning

Severe Flood Warning

3.1.3 Further clarification of the meanings of these levels of warning are given in Section 4.

3.2 Actions

3.2.1 Upon receipt of any and all Flood Alerts and Warnings from EA Floodline Warnings Direct; in particular the Severe Flood Warning, the procedure required for each level is outlined in Section 4 and Appendix 1. Section 4 also outlines the actions undertaken on receipt of a Flood Alert and Flood Warning as this is deemed necessary preparation in case of an evacuation needing to be carried out at short notice.

3.2.2 Levels of notification to potential evacuees is also outlined in section 4 and related media as part of this communication is included in Appendix 3.

NB.

Anyone with tenancy agreements with landlords of property onsite should have a clause

within their contract that they should be registered with the Environment Agency’s Flood

Warning Direct service and respond as outlined in this FEMP. Any who do not evacuate should

expect to have their contracts cancelled and be evicted.

3.3 Safe Evacuation Route

3.3.1 The primary safe exit route from the Site is described below. It should be noted that ‘on the

day’ instructions made by emergency services regarding the preferred evacuation route from

the Site may overrule the evacuation routes specified below. The below routes are the best

options judged at the time of writing the plan.

3.3.2 The Site is accessed from Hazelwick Avenue on the western boundary. The primary

evacuation route directs evacuees a short distance (approximately 90m) south along

Hazelwick Avenue before heading north-west onto Hazelwick Road. Evacuees should

continue for approximately 100m to ensure they are clear of the 1 in 1000 year flood zone.

3.3.3 A secondary evacuation route (Figure 3.1) directs evacuees out of the flood zone on foot in

a northerly direction via Hazelwick Avenue for approximately 400m (until north of the



August 2016

roundabout) to be clear of the 1 in 1000 year flood zone. This should be the second option

as flood depths are likely to be higher than the primary route.

3.3.4 Evacuees should then make their way to the community rest centre. The community rest

centre can be established by contacting Crawley Borough Council in the event of flooding

using the contact information provided in Appendix 2.



August 2016

Figure 3.1 - Safe Exit Plan



August 2016

4.0 Flood Warning Activation Procedures

WARNINGS

EA recommended actions SITE

Actions Communications Responsible

person

Flood Alert

What it means

Flooding is possible.

Be prepared.

When it’s used

Two hours to two days in advance

of flooding.

Be prepared to act on your

flood plan.

Ensure the Flood Kit is

prepared and all items are

fully charged/working

Residents to re-familiarise

themselves with all

information contained within

this FEMP.

Ensure any vulnerable or less

mobile residents known to

you are also re-familiarised

with the FEMP document and

that they are aware a Flood

Alert has been received.

Receive Environment

Agency phone call or

text alert

Residents

Flood Warning

What it means

Flooding is expected. Immediate

action required.

When it’s used

Half an hour to one day in advance

of flooding.

Be prepared to act on your

flood plan.

Ensure the Flood Kit is

prepared and all items are

fully charged/working

Residents to re-familiarise

themselves with all

information contained within

this FEMP if no prior Flood

Alert Received.

Ensure any vulnerable or less

mobile residents known to you

are also re-familiarised with

the FEMP document and that

Receive Environment

Agency phone call or

text alert

Phone call to

Crawley Borough

Council

Discuss with less

vulnerable or less

Residents

http://www.environment-agency.gov.uk/homeandleisure/floods/38329.aspx




August 2016

WARNINGS



person

they are aware a Flood

Warning has been received.

Contact Crawley Borough

Council to request sandbags

for ground floor external doors

as well as establish where the

Community Rest Centre is to

evacuate to, should flooding

occur.

mobile residents

known to you that a

flood warning has

been received and

what the

appropriate actions

will be should a

Severe Warning be

issued

Severe Flood

Warning

What it means

Severe flooding.

Danger to life.

When it’s used

When flooding poses a significant

threat to life.

Call 999 ONLY if there is an

immediate danger to life.

Co-operate with the emergency

services; they have the

power to overrule any

decisions about evacuation

timing and routes away from

the site.

Move family, pets and

valuables to a safe place.

Residents to contact Crawley

Borough Council for

information on location of the

community rest centre to

evacuate to should the

emergency services not have

arrived to advise or no Flood

Warning has been received

beforehand.

Assist any less mobile or

vulnerable residents known to

Receive Environment

Agency Phone call or

text alert confirming

severe flood warning

Phone call to

Crawley Borough

Council to establish

community rest

centre

Residents



August 2016

WARNINGS



person

Turn off gas, electricity and

water supplies if safe to do

so.

Put flood protection

equipment in place.

you and ensure they have the

means to evacuate.

Evacuate the building taking

only essentials (i.e. essential

medication and pets) and

follow recommended route

unless otherwise advised by

emergency services.

Make way to Community Rest

Centre.

EA Flood

Warnings No

longer in force

What it means

No further flooding is currently

expected in your area.

When it’s used

When river or sea conditions begin

to return to normal.

Be careful. Flood water may

still be around for several

days.

If you’ve been flooded, ring

your insurance company as

soon as possible.

Await confirmation from

emergency services or

Crawley Borough Council that

it is safe to return to your

home.

Have suitably

qualified and

equipped

professionals to

review any suspected

flood damage

Residents





August 2016

5.0 Role of Other Bodies

5.1 Other Bodies

5.1.1 There are many organisations that will play a part in response to a major flooding incident;

emergency services, utility companies and voluntary agencies to name but a few. Below are

the roles and responsibilities of some of the principal organisations that will be involved in

the early stages of a response.

5.1.2 As stated earlier, the emergency services have the power to overrule the timing of

evacuation and routes specified by this FWEP. The FWEP serves as a positive step in

implementing actions to protect life and property of occupants on site.

5.2 Environment Agency (EA)

5.2.1 Predicting flooding from statutory main rivers and the sea including the location, timing and

magnitude.

5.2.2 Issuing of Flood Warnings to partner agencies and the general public.

5.2.3 Maintenance and operation of sea and river flood defences. Check defences and undertake

essential repairs as required.

5.2.4 Providing materials and resources to repair defences where necessary

5.2.5 Advisory role in dealing with pollution issues as a result of flooding

5.3 MET Office

5.3.1 The Met office issues severe weather warnings for rain, wind, fog, ice and snow. These

warnings are delivered directly to local authorities, the emergency services and the media.

5.4 Sussex Police

5.4.1 Co-ordination of the emergency services at a major flood event, as well as helping to save

lives and protect property

5.4.2 Establishment of cordons where practical to facilitate the work of the emergency services

5.4.3 In conjunction with other emergency services, to evacuate people from properties at risk, if

necessary

5.4.4 Collation and dissemination of casualty information



August 2016

5.5 West Sussex Fire & Rescue

5.5.1 Saving life and rescuing trapped persons

5.5.2 Provide monitoring procedures in respect of health and safety of those persons operating

within an established cordon

5.5.3 Carry out essential damage control measures including pumping out flood water and salvage

work

5.5.4 Rendering humanitarian services in support of the local authority

5.6 Crawley Borough Council

5.6.1 Providing support to the emergency services

5.6.2 Mitigation of the effects of an emergency on people, including emergency feeding,

accommodation and welfare.

5.6.3 Co-ordination of the voluntary sector response

5.6.4 Information services to the public and media

5.6.5 Flood alleviation measures at the request of the emergency services

5.6.6 Environmental health advice

5.6.7 Rehabilitation of the community and restoration of the environment

5.7 Utility Companies

5.7.1 In the event of a flood, will secure their services and equipment to ensure continuity of

supply

5.7.2 Repair services disrupted by flood

5.7.3 Provide alternative means of supply during service disruption if life and death health risks

are identified



August 2016

6.0 Flood Risk

6.1 Flood Risk

6.1.1 A flood risk assessment has been carried out for this site, and is included as an appendix for further information. Table 6.1 below indicates the sources of flooding at the site and their estimated depths, and flood warning time.

Table 6.1. Sources of Flood Risk at the Site

Flood Risk

Source

Warning System

in place

(E.g. the EA’s

Floodline

Warnings Direct,

MET Office)

Estimated

Warning Time

(Hrs)

Estimated Flood

Depth

(m AOD)

Frequency /

Probability of

Flooding from

this Source

Fluvial

Flooding

EA Floodline

Warnings Direct

0345 988 1188

Quickdial: 173414

2 hrs 0.3 1% AEP

Tidal

Flooding N/A N/A N/A N/A

Ground

Water

Flooding

N/A N/A N/A N/A

Surface

Water

Flooding

N/A N/A N/A N/A

Reservoir

Flooding N/A N/A N/A N/A

Environment Agency Floodline Warnings Direct

The Environment Agency (EA) operate a flood forecasting and warning service in areas at

risk of flooding from rivers or the sea, which relies on direct measurements of rainfall,

river levels, tide levels, in-house predictive models, rainfall radar data and information

from the Met Office. This service operates 24 hours a day, 365 days a year. If flooding is

forecast, warnings are issued using a set of four easily recognisable codes see section 4.

Below are the key contact details to enquire about information regarding flooding:



August 2016

Environment Agency Floodline Warnings Direct

Flood Alerts - Ifield Brook, Upper River Mole, Gatwick Stream, Burstow Stream and

Salfords Stream

EA Floodline Warning Direct – 0345 988 11 88. Select option 1 and enter Quickdial

number 173491 to get more information

Flood Warning – Gatwick Stream at Maidenbower and Crawley

EA Floodline Warning Direct – 0345 988 11 88. Select option 1 and enter Quickdial

number 173414 to get more information



August 2016

APPENDICES

Appendix 1

Site Specific Communications, Traffic and Command Structure

Communications and Evacuation Procedure

1. Severe Flood Warning received from EA;

2. Residents to contact Crawley Borough Council for information on

location of the community rest centre to evacuate to should the

emergency services not have arrived to advise or no Flood Warning has

been received beforehand.

3. Assist any less mobile or vulnerable residents known to you and ensure

they have the means to evacuate.

4. Evacuate the building taking only essentials (i.e. essential medication

and pets) and follow recommended route in FEMP unless otherwise

advised by emergency services.

5. Make way to Community Rest Centre.



August 2016

Appendix 2

Emergency Contact Numbers

Emergency Contact List

Management Company: ………………………………………………………………………….

24 hour contact number: …………………………………………………………………………

Flood Alert/Warning Contact Numbers

Flood Alerts - Ifield Brook, Upper River Mole, Gatwick Stream, Burstow Stream

and Salfords Stream

EA Floodline Warning Direct – 0345 988 11 88. Select option 1 and enter

Quickdial number 173491 to get more information

Flood Warning – Gatwick Stream at Maidenbower and Crawley

EA Floodline Warning Direct – 0345 988 11 88. Select option 1 and enter

Quickdial number 173414 to get more information

Local Authority Contact Number

Crawley Borough Council, Emergency Management – 01293 438000 available

24/7/365

Emergency Services

Police, Ambulance Service, Fire Service, Coastguard – 999 to request

Environment Agency (Crawley) – 01903 832040



August 2016

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