Flood Emergency Plan - Shire of Mansfield Flood... · This Municipal Flood Emergency Plan is a result of the cooperative efforts of the Mansfield Shire Flood Planning Committee (MFPC)

Mansfield Shire

Flood Emergency Plan A Sub-Plan of the Municipal Emergency Management Plan

For Mansfield Shire Council And

VICSES North East Regional Office and Mansfield Unit

Version 1.0 June 2014

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - ii -

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - iii -

Contents

DISTRIBUTION LIST .......................................................................................................................... VI

DOCUMENT TRANSMITTAL FORM / AMENDMENT CERTIFICATE ............................................ VII

LIST OF ABBREVIATIONS & ACRONYMS .................................................................................... VIII

PART 1. INTRODUCTION ................................................................................................................ 1

1.1 MUNICIPAL ENDORSEMENT ..................................................................................................... 1

1.2 THE MUNICIPALITY .................................................................................................................. 1

1.3 PURPOSE AND SCOPE OF THIS FLOOD EMERGENCY PLAN ........................................................ 2

1.4 MUNICIPAL FLOOD PLANNING COMMITTEE (MFPC) ................................................................. 2

1.5 RESPONSIBILITY FOR PLANNING, REVIEW & MAINTENANCE OF THIS PLAN ................................. 2

1.6 ENDORSEMENT OF THE PLAN .................................................................................................. 2

PART 2. PREVENTION / PREPAREDNESS ARRANGEMENTS .................................................. 3

2.1 COMMUNITY AWARENESS FOR ALL TYPES OF FLOODING .......................................................... 3

2.2 STRUCTURAL FLOOD MITIGATION MEASURES .......................................................................... 3

2.3 NON-STRUCTURAL FLOOD MITIGATION MEASURES .................................................................. 3

2.3.1 Exercising the Plan ............................................................................................................................... 3

2.3.2 Flood Warning ...................................................................................................................................... 3

2.3.3 Local Knowledge .................................................................................................................................. 3

PART 3. RESPONSE ARRANGEMENTS ....................................................................................... 4

3.1 INTRODUCTION ....................................................................................................................... 4

3.1.1 Activation of Response ......................................................................................................................... 4

3.1.2 Responsibilities .................................................................................................................................... 4

3.1.3 Municipal Emergency Coordination Centre (MECC) ............................................................................ 4

3.1.4 Escalation ............................................................................................................................................. 4

3.2 STRATEGIC CONTROL PRIORITIES ........................................................................................... 5

3.3 COMMAND, CONTROL & COORDINATION .................................................................................. 5

3.3.1 Control .................................................................................................................................................. 5

3.3.2 Incident Controller (IC) ......................................................................................................................... 6

3.3.3 Incident Control Centre (ICC) ............................................................................................................... 6

3.3.4 Divisions and Sectors ........................................................................................................................... 6

3.3.5 Incident Management Team (IMT) ....................................................................................................... 7

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - iv -

3.3.6 Emergency Management Team (EMT) ................................................................................................ 7

3.3.7 On Receipt of a Flood Watch / Severe Weather Warning ................................................................... 7

3.3.8 On Receipt of the First and Subsequent Flood Warnings ................................................................... 8

3.4 COMMUNITY INFORMATION AND WARNINGS ............................................................................. 8

3.5 MEDIA COMMUNICATION ......................................................................................................... 9

3.6 RAPID IMPACT ASSESSMENT .................................................................................................... 9

3.7 PRELIMINARY DEPLOYMENTS .................................................................................................. 9

3.8 RESPONSE TO FLASH FLOODING ........................................................................................... 10

3.9 EVACUATION. ....................................................................................................................... 10

3.10 FLOOD RESCUE .................................................................................................................... 10

3.11 AIRCRAFT MANAGEMENT ...................................................................................................... 11

3.12 RESUPPLY ............................................................................................................................ 11

3.13 ESSENTIAL COMMUNITY INFRASTRUCTURE AND PROPERTY PROTECTION ............................... 11

3.14 DISRUPTION TO SERVICES .................................................................................................... 12

3.15 ROAD CLOSURES ................................................................................................................. 12

3.16 DAM FAILURE ....................................................................................................................... 13

3.17 WASTE WATER RELATED PUBLIC HEALTH ISSUES AND CRITICAL SEWERAGE ASSETS ............. 13

3.18 AFTER ACTION REVIEW ........................................................................................................ 13

PART 4. EMERGENCY RELIEF AND RECOVERY ARRANGEMENTS ..................................... 14

4.1 GENERAL ............................................................................................................................. 14

4.2 EMERGENCY RELIEF ............................................................................................................. 14

4.3 ANIMAL WELFARE ................................................................................................................. 14

4.4 TRANSITION FROM RESPONSE TO RECOVERY ........................................................................ 14

APPENDIX A - FLOOD THREATS FOR MANSFIELD SHIRE ........................................................ 15

GENERAL ......................................................................................................................................... 15

HISTORIC FLOODS ............................................................................................................................ 15

DESCRIPTION OF MAJOR WATERWAYS AND DRAINS ........................................................................... 17

APPENDIX B ..................................................................................................................................... 19

TYPICAL FLOOD PEAK TRAVEL TIMES ....................................................................................... 19

HYDROLOGICAL DATA ................................................................................................................... 20

APPENDIX C1 – MANSFIELD TOWNSHIP - FLOOD EMERGENCY PLAN .................................. 25

OVERVIEW OF FLOODING CONSEQUENCES ........................................................................................ 25

OVERVIEW OF FLOOD CHARACTERISTICS .......................................................................................... 25

FLOOD MITIGATION ........................................................................................................................... 27

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - v -

FLOOD IMPACTS AND REQUIRED ACTIONS ......................................................................................... 27

COMMAND, CONTROL AND COORDINATION ........................................................................................ 30

APPENDIX C2 – JAMIESON - FLOOD EMERGENCY PLAN ......................................................... 31


ITEM ................................................................................................................................................. 31

ITEMS INUNDATED ............................................................................................................................. 31

ESTIMATED POPULATION AFFECTED ................................................................................................... 31

FLOOD MITIGATION ........................................................................................................................... 32


APPENDIX C3 – TONGA BRIDGE FLOOD EMERGENCY PLAN .................................................. 33



COMMAND, CONTROL AND COORDINATION ........................................................................................ 34

APPENDIX D - FLOOD EVACUATION ARRANGEMENTS ............................................................ 35

PHASE 1 - DECISION TO EVACUATE ................................................................................................... 35

PHASE 2 – WARNING ........................................................................................................................ 36

PHASE 3 – WITHDRAWAL .................................................................................................................. 36

PHASE 4 – SHELTER ......................................................................................................................... 36

PHASE 5 – RETURN .......................................................................................................................... 36

DISRUPTION TO SERVICES ................................................................................................................ 37

ESSENTIAL COMMUNITY INFRASTRUCTURE AND PROPERTY PROTECTION ........................................... 37

RESCUE ........................................................................................................................................... 37

APPENDIX E - FLOOD WARNING SYSTEMS ................................................................................ 38

FLOOD WARNING .............................................................................................................................. 38

FLOOD BULLETINS ............................................................................................................................ 38

APPENDIX F – MAPS ....................................................................................................................... 39

MAP 1 – UPPER GOULBURN CATCHMENT .................................................................................. 40

MAP 2 – MANSFIELD 1% AEP FLOOD ........................................................................................... 40

MAP 3 – JAMIESON 1% AEP FLOOD ............................................................................................. 40

MAP 4 - JAMIESON LOCAL FLOOD GUIDE MAP ......................................................................... 40

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - vi -

Distribution List

Copy No.

Issue To: Date

Name Organisation

Original Kevin Murphy MEMP Committee Executive Officer

1 David Roff Council CEO Copy

2 Cr Paul Sladdin MEMP Committee Chairman

3 Kevin Murphy MERO

4 Tim Davidson Deputy MERO

5 Louise Knol MRM

6 S/Sgt Lynette Holland MERC

7 Supt Fred Johansson RERC

8 OIC Mansfield Police Station

9 OIC Jamieson Police Station

10 VICSES North East RHQ

11 Peter Lewis VICSES Mansfield unit)

12 Guy Tierney Goulbourn Broken Catchment Management Authority

13 Bureau of Meteorology (Flood Warning)

14 Scott Edwards DEPI

15 Bart Smith Parks Victoria (Where appropriate)

16 Ambulance Victoria

17 CFA Jamieson Brigade)

18 Paul Horton CFA D23 Headquarters

19 VicRoads

20 Leo Ryan Department of Human Services

21 Department of Health

22 Power supplier

23 Ken Turner Goulburn Valley Water

24 Goulburn Murray Water

25

26

27

28

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - vii -

Document Transmittal Form / Amendment Certificate

This Municipal Flood Emergency Plan (MFEP) will be amended, maintained and distributed as

required by VICSES in consultation with the Mansfield Shire.

Suggestions for amendments to this Plan should be forwarded to VICSES North East Regional

Office 64 Sydney Road, Benalla 3672.

Amendments listed below have been included in this Plan and promulgated to all registered

copyholders.

Amendment

Number

Date of

Amendment

Amendment

Entered By

Summary of Amendment

This Plan will be maintained on the www.ses.vic.gov.au website.

http://www.ses.vic.gov.au/

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - viii -

List of Abbreviations & Acronyms

The following abbreviations and acronyms are used in the Plan:

AEP Annual Exceedance Probability

AHD Australian Height Datum (the height of a location above mean sea level in metres)

AIIMS Australasian Inter-service Incident Management System

AoCC Area of Operations Control Centre / Command Centre

ARI Average Recurrence Interval

ARMCANZ Agricultural & Resource Management Council of Australia & New Zealand

AV Ambulance Victoria

BoM Bureau of Meteorology

CEO Chief Executive Officer

CERM Community Emergency Risk Management

CFA Country Fire Authority

CMA Catchment Management Authority

RERC Regional Emergency Response Coordinator

RERCC Regional Emergency Response Coordination Centre

DHS Department of Human Services

DH Department of Health

DoI Department of Infrastructure

DEPI Department of Environment and Primary Industries (formally DSE & DPI)

EMMV Emergency Management Manual Victoria

EMT Emergency Management Team

EO Executive Officer

FO Floodway Overlay

FWS Flood Warning System

UFZ Urban Floodway Zone

IC Incident Controller

ICC Incident Control Centre

IMT Incident Management Team

IMS Incident Management System

EMLO Emergency Management Liaison Officer

LSIO Land Subject to Inundation Overlay

MECC Municipal Emergency Coordination Centre

MEMP Municipal Emergency Management Plan

MEMPC Municipal Emergency Management Planning Committee

MERC Municipal Emergency Response Coordinator

MERO Municipal Emergency Resource Officer

MFB Metropolitan Fire and Emergency Services Board

MRM Municipal Recovery Manager

PMF Probable Maximum Flood

RCC Regional Control Centre

RDO Regional Duty Officer

SBO Special Building Overlay

SCC State Control Centre

SEWS Standard Emergency Warning System

SHERP State Health Emergency Response Plan

SOP Standard Operating Procedure

VicPol Victoria Police

Mansfield Shire Flood Emergency Plan – A Sub-Plan of the MEMPlan - 1 -

Part 1. INTRODUCTION

1.1 Municipal Endorsement

This Municipal Flood Emergency Plan (MFEP) has been prepared by the informal Mansfield

Flood Planning Subcommittee and with the authority of the Municipal Emergency Management

Planning Committee (MEMPC) pursuant to Section 20 of the Emergency Management Act

1986 (as amended).

This MFEP is a sub plan to the Mansfield Shire Municipal Emergency Management Plan

(MEMP), is consistent with the Emergency Management Manual Victoria (EMMV) and the

Victoria Flood Management Strategy (DNRE, 1998a), and takes into account the outcomes of

the Community Emergency Risk Management (CERM) process undertaken by the Municipal

Emergency Management Planning Committee (MEMPC).

The Municipal Flood Emergency Plan is consistent with the Regional Flood Emergency Plan

and the State Flood Emergency Plan.

This Municipal Flood Emergency Plan is a result of the cooperative efforts of the Mansfield

Shire Flood Planning Committee (MFPC) and its member agencies.

This Plan is endorsed by the Mansfield Shire MEMPC as a sub-plan to the MEMP.

Endorsement

Keith O’Brien

…………………………………………………………………………………………………………………….

Regional Manager – North East Region VICSES

…………………………….………………………………………………………………………….…………..

Cr Paul Sladdin Chair - Municipal Emergency Management Planning Committee

Date

1.2 The Municipality

An outline of Mansfield Shire in terms of its location, demography and other general matters is

provided in the MEMP. An outline of the flood threat is provided in Appendix A of this Plan.


1.3 Purpose and Scope of this Flood Emergency Plan

The purpose of this MFEP is to detail arrangements agreed for the planning,

preparedness/prevention, response and recovery from flood incidents within the Mansfield

Shire. As such, the scope of the Plan is to:

Identify the Flood Risk to Mansfield Shire;

Support the implementation of measures to minimise the causes and impacts of flood

incidents within the Mansfield Shire;

Detail Response and Recovery arrangements including preparedness, Incident

Management, Command and Control; and

Identify linkages with Local, Regional and State emergency and wider planning

arrangements with specific emphasis on those relevant to flood.

1.4 Municipal Flood Planning Committee (MFPC)

Membership of the Mansfield Shire Flood Planning Committee (MFPC) will comprise the

following representatives from the following agencies and organisations:

VICSES (i.e. Unit Controller & Regional Officer – Emergency Management) (Chair),

Mansfield Shire,

Victoria Police (i.e. Municipal Emergency Response Co-ordinator) (MERC),

Catchment Management Authority,

Country Fire Authority

Department of Health (DH) as required,

Department of Human Services (DHS) as required.

1.5 Responsibility for Planning, Review & Maintenance of this Plan

This Municipal Flood Emergency Plan must be maintained in order to remain effective.

VICSES through the Flood Planning Committee has responsibility for preparing, reviewing,

maintaining and distributing this plan.

The MFPC will meet at least once per year.

The plans should be reviewed:

Following any new flood study;

Change in non-structural and/or structural flood mitigation measures;

After the occurrence of a significant flood event within the Municipality to review and where

necessary amend arrangements and information contained in this Plan.

1.6 Endorsement of the Plan

The MFEP has been circulated to MFPC members seeking acceptance of the draft plan.

Upon acceptance, the plan was forwarded to the MEMPC for endorsement with the

recommendation to include the MFEP as a sub-plan of the MEMPlan.


Part 2. PREVENTION / PREPAREDNESS

ARRANGEMENTS

2.1 Community Awareness for all Types of Flooding

Details of this MFEP will be released to the community through local media, the FloodSafe

program, websites (VICSES and the Municipality) upon formal adoption by Mansfield Shire

VICSES with the support of Mansfield Shire and Goulburn Broken CMA will coordinate

community education programs for flooding within the council area. E.g. FloodSafe /

StormSafe.

A FloodSafe Community Education/Communication Plan is currently being developed for

Jamieson and will be delivered during 2014

2.2 Structural Flood Mitigation Measures

The following summary of structural flood mitigation measures exist within the Council area:

No structural flood mitigation works have been proposed for consideration by the previous studies

and subsequent reviews undertaken jointly by the Goulburn Broken Catchment Management

Authority and Council.

Under the council’s planning scheme, a flood overlay that will limit future development is currently in

development with community consultation occurring.

2.3 Non-structural Flood Mitigation Measures

2.3.1 Exercising the Plan

Arrangements for exercising this Plan will be at the discretion of the MEMPC. This Plan should

be regularly exercised, preferably on an annual basis. Refer to section 4.7 of the EMMV for

guidance. As part of the endorsement process of this plan it was exercised on 22nd

of July

2014 at the Benalla ICC.

2.3.2 Flood Warning

Arrangements for flood warning are contained within the State Flood Emergency Plan and the

EMMV (Part 3.7) and on the BoM website.

Specific details of local flood warning system arrangements are provided in Appendix E.

2.3.3 Local Knowledge

The VICSES Local Knowledge Policy outlines the strategies and principles for ensuring the

incorporation of local knowledge in decision making before, during and after incidents.

Specific details of arrangements to capture local knowledge will be provided in Appendix G

once established.

It is proposed a series of Community Observers (Landowners) will be established upstream of

Jamieson to provide timely observations and advise of any flood concerns to the authorities,

agencies and the local community – In particular to those in low lying streets and the caravan

park.


Part 3. RESPONSE ARRANGEMENTS

3.1 Introduction

3.1.1 Activation of Response

Flood response arrangements may be activated by the Regional Duty Officer (RDO) VICSES

Mansfield Shire Region or Incident Controller.

The Incident Controller/RDO VICSES will activate agencies as required and documented in

the State Flood Emergency Plan.

3.1.2 Responsibilities

There are a number of agencies with specific roles that will act in support of VICSES and

provide support to the community in the event of a serious flood within the Mansfield Shire.

These agencies will be engaged through the EMT.

The general roles and responsibilities of supporting agencies are as agreed within the

Mansfield Shire. MEMP, EMMV (Part 7 ‘Emergency Management Agency Roles’), State

Flood Emergency Plan and Regional Flood Emergency Plan.

3.1.3 Municipal Emergency Coordination Centre (MECC)

Liaison with the MECC will be through the established Division/Sector Command and

through Municipal involvement in the Incident EMT, in particular the Municipal Emergency

Response Coordinator (MERC). The VICSES RDO / ICC will liaise with the MECC & MERO

directly if no Division/Sector Command is established.

The function, location, establishment and operation of the MECC is as detailed in the

Mansfield Shire MEMP.

3.1.4 Escalation

Most flood incidents are of local concern and an appropriate response can usually be

coordinated using local resources. However, when these resources are exhausted, the

State’s arrangements provide for further resources to be made available, firstly from

neighbouring Municipalities (on a regional basis) and then on a State-wide basis.

Resourcing and event escalation arrangements are described in the EMMV (‘State

Emergency Response Plan’ – section 3.5).


3.2 Strategic Control Priorities

To provide guidance to the Incident Management Team (IMT), the following strategic control

priorities shall form the basis of incident action planning processes:

1. Protection and preservation of life is paramount - this includes:

a. Safety of emergency services personnel; and,

b. Safety of community members including vulnerable community members and

visitors/tourist located within the incident area.

2. Issuing of community information and community warnings detailing incident information

that is timely, relevant and tailored to assist community members make informed decisions

about their safety;

3. Protection of critical infrastructure and community assets that supports community

resilience;

4. Protection of residential property as a place of primary residence;

5. Protection of assets supporting individual livelihoods and economic production that

supports individual and community financial sustainability;

6. Protection of environmental and conservation values that considers the cultural,

biodiversity, and social values of the environment.

Circumstances may arise where the Incident Controller is required to vary these priorities, with

the exception being that the protection of life should remain the highest. This shall be done in

consultation with the State Controller and relevant stakeholders based on sound incident

predictions and risk assessments.

3.3 Command, Control & Coordination

The Command, Control and Coordination arrangements in this Municipal Flood Emergency

Plan must be consistent with those detailed in State and Regional Flood Emergency Plans.

For further information, refer to sections 3.4, 3.5 & 3.6 of the EMMV.

The specific details of the Command, Control and Coordination arrangements for this plan are

to be provided in Appendix C.

3.3.1 Control

Functions 5(a) and 5(c) at Part 2 of the Victoria State Emergency Service Act 1986 (as

amended) detail the authority for VICSES to plan for and respond to flood.

Part 7.1 of the EMMV prepared under the Emergency Management Act 1986 (as amended),

identifies VICSES as the Control Agency for flood. It identifies DEPI as the Control Agency

responsible for “dam safety, water and sewerage asset related incidents” and other

emergencies

All flood response activities within the Mansfield Shire including those arising from a dam

failure or retarding basin / levee bank failure incident will therefore be under the control of the

appointed Incident Controller, or his / her delegated representative.


3.3.2 Incident Controller (IC)

An Incident Controller (IC) will be appointed by the VICSES (as the Control Agency) to

command and control available resources in response to a flood event on the advice of the

Bureau of Meteorology (or other reliable source) that a flood event will occur or is occurring.

The Incident Controller responsibilities are as defined in Part 3.5 of the EMMV

3.3.3 Incident Control Centre (ICC)

As required, the Incident Controller will establish an Incident Control Centre (ICC) from which

to initiate incident response command and control functions. The decision as to if and when

the ICC should be activated, rests with the Control Agency (i.e. VICSES).

Pre-determined Incident Control Centre locations are

Goulburn Broken Catchment Management Authority Area

Primary ICC Facilities

Location Shepparton

Owner CFA District 22

Address 195-205 Numurkah Road Shepparton

Location Seymour

Owner CFA District 12

Address Macintyre Street Seymour.

Location Benalla

Owner SES RHQ

Address 64 Sydney Road Benalla

3.3.4 Divisions and Sectors

To ensure that effective Command and Control are in place, the Incident Controller may

establish Divisions and Sectors depending upon the complexity of the event and resource

capacities.

The following Divisions and Sectors may be established to assist with the management of

flooding within the Goulburn River


Pre-determined Division Command locations are:

It is not anticipated that VICSES would site a Divisional Command Location within

Mansfield Shire.

For Goulburn River flooding the Divisional Command will be sited at Seymour CFA.

Pre-determined Sector Command locations are:

Mansfield SES LHQ

Jamieson Police Station or Jamieson Hall (as directed by the incident controller)

3.3.5 Incident Management Team (IMT)

The Incident Controller will form an Incident Management Team (IMT).

Refer to 3.5 of the EMMV for guidance on IMTs and Incident Management Systems (IMSs).

3.3.6 Emergency Management Team (EMT)

The Incident Controller will establish a multi-agency Emergency Management Team (EMT)

to assist the flood response. The EMT will consist of key personnel (with appropriate

authority) from stakeholder agencies and relevant organisations who need to be informed of

strategic issues related to incident control and who are able to provide high level strategic

guidance and policy advice to the Incident Controller for consideration in developing incident

management strategies.

Organisations, including Mansfield Shire, required within the EMT will provide an Emergency

Management Liaison Officer (EMLO) to the ICC if and as required as well as other staff and /

or resources identified as being necessary, within the capacity of the organisation.

Refer to 3.5 of the EMMV for guidance on EMTs.

3.3.7 On Receipt of a Flood Watch / Severe Weather Warning

Incident Controller or VICSES RDO (until an incident controller is appointed) will undertake

actions as defined within the flood intelligence cards (Appendix C). General considerations

by the Incident Controller/VICSES RDO will be as follows:

Review flood intelligence to assess likely flood consequences.

Monitor weather and flood information – www.bom.gov.au

Assess Command and Control requirements.

Review local resources and consider needs for further resources regarding personnel,

property protection, flood rescue and air support.

Notify and brief appropriate officers. This includes Regional Control Centre (RCC) (if

established), State Control Centre (SCC) (if established), Council, other emergency

services through the EMT.

Assess ICC readiness (including staffing of IMT and EMT) and open if required.

Ensure flood bulletins and community information are prepared and issued to the

community.

Monitor watercourses and undertake reconnaissance of low-lying areas.

Develop media and community information management strategy.

Ensure flood mitigation works are being checked by owners.

http://www.bom.gov.au/


Develop and issue incident action plan, if required.

3.3.8 On Receipt of the First and Subsequent Flood Warnings

Incident Controller/VICSES RDO (until an incident controller is appointed) will undertake

actions as defined within the flood intelligence cards (Appendix C). General considerations

by the Incident Controller/VICSES RDO will be as follows:

Develop an appreciation of current flood levels and predicted levels. Are floodwaters, rising,

peaking or falling?

Review flood intelligence to assess likely flood consequences. Consider:

What areas may be at risk of inundation

What areas may be at risk of isolation

What areas may be at risk of indirect affects as a consequence of power, gas,

water, telephone, sewerage, health, transport or emergency service infrastructure

interruption

The characteristics of the populations at risk

Determine what the at-risk community need to know and do as the flood develops.

Warn the at-risk community including ensuring that an appropriate warning and community

information strategy is implemented including details of:

The current flood situation

Flood predictions

What the consequences of predicted levels may be

Public safety advice

Who to contact for further information

Who to contact for emergency assistance

Liaise with relevant asset owners as appropriate (i.e. water and power utilities)

Implement response strategies as required based upon flood consequence assessment.

Continue to monitor the flood situation – www.bom.gov.au/vic/flood/

Continue to conduct reconnaissance of low-lying areas

3.4 Community Information and Warnings

Guidelines for the distribution of community information and warnings are contained in the

State Flood Emergency Plan.

Community information and warnings communication methods available include:

Emergency Alert;

Phone messages (including SMS);

Radio and Television;

Two-way radio;

Mobile and fixed public address systems;

Sirens;

Verbal Messages (i.e. Doorknocking);

http://www.bom.gov.au/vic/flood/


Agency Websites;

VICSES Flood Storm Information Line;

Variable Message Signs (i.e. road signs);

Community meetings;

Newspapers;

Email;

Telephone trees;

Community Flood Wardens;

Fax Stream;

Newsletters;

Letter drops;

Social media and/or social networking sites (i.e. twitter and/or ).

Refer to Appendix C and E for the specific details of how community information and warnings

are to be provided.

The release of flood bulletins and information with regard to response activities at the time of a

flood event is the responsibility of VICSES, as the Control Agency.

Council has the responsibility to assist VICSES to warn individuals within the community

including activation of flood warning systems, where they exist. Responsibility for public

information, including media briefings, rest with VICSES as the Control Agency.

Other agencies such as CFA, DEPI and VICPOL may be requested to assist VICSES with the

communication of community flood warnings.

In cases where severe flash flooding is predicted, dam failure is likely or flooding necessitating

evacuation of communities is predicted, the Incident Controller may consider the use of the

Emergency Alert System and Standard Emergency Warning System (SEWS).

DH will coordinate information regarding public health and safety precautions.

3.5 Media Communication

The Incident Controller through the Information Unit established at the ICC will manage Media

communication. If the ICC is not established the RDO will manage all media communication.

3.6 Rapid impact assessment

A rapid impact assessment will be conducted in accordance with part 3 of the EMMV to assess

and record the extent and nature of damage caused by flooding. This information may then be

used to provide the basis for further needs assessment and recovery planning by Council, DHS

and recovery agencies.

3.7 Preliminary Deployments

When flooding is expected to be severe enough to cut access to towns and/or communities the

Incident Controller will consult with relevant agencies to ensure that resources are in place if

required to provide emergency response. These resources might include emergency service

personnel, food items and non-food items such as medical supplies, shelter, assembly areas,

relief centres etc.


3.8 Response to Flash Flooding

Emergency management response to flash flooding should be consistent with the guideline for the

emergency management of flash flooding contained within the State Flood Emergency Plan.

When conducting pre-event planning for flash floods the following steps should be followed, and in

the order as given:

Determine if there are barriers to evacuation by considering warning time, safe routes, resources

available .

If evacuation is possible, then evacuation should be the adopted strategy and it must be supported

by a public information capability and a rescue contingency plan;

Where it is likely people will become trapped by floodwaters due to limited evacuation options

safety advice needs to be provided to people at risk advising them not to attempt to flee by entering

floodwater if they become trapped, and that it may be safer to seek the highest point within the

building and to telephone 000 if they require rescue. This advice needs to be provided even when

evacuation may be possible, due the likelihood that not all community members will evacuate.

For buildings known to be structurally un-suitable an earlier evacuation trigger will need to be

established (return to step 1 of this cycle).

If an earlier evacuation is not possible then specific preparations must be made to rescue

occupants trapped in structurally unsuitable buildings either pre-emptively or as those people call

for help.

During a flash flood it will often be difficult, due the rapid development of flooding, to establish

evacuation (relief) centres ahead of actually triggering the evacuation as is normal practice but this

is insufficient justification for not adopting evacuation.

3.9 Evacuation.

The decision to recommend or warn people to prepare to evacuate or to evacuate immediately

rests with the Incident Controller.

Once the decision is made VicPol are responsible for the management of the evacuation

process where possible. VICSES and other agencies will assist where practical. VICSES is

responsible for the development and communication of evacuation warnings.

VicPol and/or Australian Red Cross may take on the responsibility of registering people

affected by a flood emergency including those who have been evacuated.

Refer to section 3.8 of the EMMV and the Evacuation Guidelines for guidance of evacuations

for flood emergencies.

Refer to Appendix C of this Plan for detailed evacuation arrangements for Mansfield Shire

3.10 Flood Rescue

VICSES may conduct flood rescues. Appropriately trained and equipped VICSES units or other

agencies that have appropriate training, equipment and support may carry out rescues.

Rescue operations may be undertaken where voluntary evacuation is not possible, has failed

or is considered too dangerous for an at-risk person or community. An assessment of available

flood rescue resources (if not already done prior to the event) should be undertaken prior to the

commencement of rescue operations.


Rescue is considered a high-risk strategy to both rescuers and persons requiring rescue and

should not be regarded as a preferred emergency management strategy. Rescuers should

always undertake a dynamic risk assessment before attempting to undertake a flood rescue.

3.11 Aircraft Management

Aircraft can be used for a variety of purposes during flood operations including evacuation,

resupply, reconnaissance, intelligence gathering and emergency travel.

Air support operations will be conducted under the control of the Incident Controller.

The Incident Controller may request aircraft support through the State Air Desk located at the

State Control Centre will establish priorities.

Below are facilities in the Shire suitable for aircraft operation

Mansfield Airfield YMFD

Runway 15/33

Grass /Turf 3916 ft x 200 ft (1194 m x 61 m)

Longitude 37-04-24 S (-37.073542)

Latitude 146-07-13 E (146.120512)

Mansfield Helipad

Next to SES LHQ (Lighting provided by SES)

3.12 Resupply

Communities, neighbourhoods or households can become isolated during floods as a

consequence of road closures or damage to roads, bridges and causeways. Under such

circumstances, the need may arise to resupply isolated communities/properties with essential

items.

When predictions/intelligence indicates that communities, neighbourhoods and/or households

may become isolated, VICSES will if time permits advise businesses and/or households that

they should stock up on essential items.

After the impact, VICSES can support isolated communities through assisting with the transport

of essential items to isolated communities and assisting with logistics functions.

Resupply operations are to be included as part of the emergency relief arrangements with

VICSES working with the relief agencies to service communities that are isolated

3.13 Essential Community Infrastructure and Property Protection

Essential Community Infrastructure and Property (e.g. residences, businesses, roads, power

supply etc.) may be affected in the event of a flood.

The Mansfield Shire maintains a small stock of sandbags at the following locations for property

protection at the Municipal Depot Lakins Road Mansfield, back-up supplies are available

through the VICSES Regional Headquarters.A small quantity of sandbags is also maintained


by SES at the CFA Station in Jamieson. Additionally Mansfield Shire will maintain a five cubic

meter stockpile of sand at Jamieson to be located at the playground area Perkins Street

Jamieson (Adjacent to the CFA Station).

The Incident Controller will determine the priorities related the use of sandbags, which will be

consistent with the strategic priorities.

If VICSES sandbags are becoming limited in supply, then priority will be given to protection of

Essential Community Infrastructure. Other high priorities may include for example the

protection of historical buildings.

Property may be protected by:

Sandbagging to minimise entry of water into buildings,

Encouraging businesses and households to lift or move contents.

Construction of temporary levees in consultation with the CMA, LGA and VICPOL and

within appropriate approval frameworks.

Emergency Commercial sandbag suppliers

At time of revision of this plan, commercial sandbag suppliers are:

Pope Packaging 5 Boundary Road North Melbourne VIC 3501

Tel (03) 9329 8699

RN & G Lowin 379 George Street Fitzroy VIC3065

Tel (03) 9417 2583 or after hours (03) 95283436

(This commercial information is provided as support information only. It is possible that between

revisions, sandbag suppliers may have changed. As such the information should not be relied

upon, but acts as a starting point during preparedness and in the event of an emergency.)

The Incident Controller will ensure that owners of Essential Community Infrastructure are kept

advised of the flood situation. Essential Community Infrastructure providers must keep the Incident

Controller informed of their status and ongoing ability to provide services.

Refer to Appendix C for further specific details of essential infrastructure requiring protection and

location of sandbag collection point(s).

3.14 Disruption to Services

Disruption to services other than essential community infrastructure and property can occur in flood

events. Refer to Appendix C for specific details of likely disruption to services and proposed

arrangements to respond to service disruptions in Mansfield Shire.

3.15 Road Closures

Mansfield Shire and VicRoads will carry out their formal functions of road closures including

observation and placement of warning signs, road blocks etc. to its designated local and

regional roads, bridges, walking and bike trails. Mansfield Shire staff may also liaise with and

advise VicRoads as to the need or advisability of erecting warning signs and / or of closing

roads and bridges under its jurisdiction. VicRoads are responsible for designated main roads

and highways and Councils are responsible for the designated local road network.


VICROADS and Mansfield Shire will communicate community information regarding road

closures.

3.16 Dam Failure

DEPI is the Control Agency for dam safety incidents (e.g. breach, failure or potential breach /

failure of a dam), however VICSES is the Control Agency for any flooding that may result.

Major dams with potential to cause structural and community damage within the Municipality

are contained in Appendix A.

3.17 Waste Water related Public Health Issues and Critical Sewerage Assets

Inundation of critical sewerage assets including septic tanks and sewerage pump stations may

result in water quality problems within the Municipality. Where this is likely to occur or has

occurred the responsible agency for the critical sewerage asset should undertake the following:

Advise VICSES of the security of critical sewerage assets to assist preparedness and

response activities in the event of flood;

Maintain or improve the security of critical sewerage assets;

Check and correct where possible the operation of critical sewerage assets in times of

flood;

Advise the ICC in the event of inundation of critical sewerage assets.

It is the responsibility of the Mansfield Shire Environmental Health Officer to inspect and report

to the MERO and the ICC on any water quality issues relating to flooding. Note Jamieson

township is reliant on on-site wastewater septic systems with some requiring electrical power

supply to function.

3.18 After Action Review

VICSES will coordinate the after action review arrangements of flood operations as soon as

practical following an event.

All agencies involved in the flood incident should be represented at the after action review.


Part 4. EMERGENCY RELIEF AND RECOVERY

ARRANGEMENTS

4.1 General

Arrangements for recovery from a flood incident within the Mansfield Shireare detailed in the

Mansfield Shire MEMP.

4.2 Emergency Relief

The decision to recommend the opening of an emergency relief centre rests with the Incident

Controller. Incident Controllers are responsible for ensuring that relief arrangements have

been considered and implemented where required under the State Emergency Relief and

Recovery Plan (Part 4 of the EMMV).

The range and type of emergency relief services to be provided in response to a flood event

will be dependent upon the size, impact, location and scale of the flood. Refer to 4.4 of the

EMMV for details of the range of emergency relief services that may be provided.

Details of the all hazard relief arrangements are available in the MEMPlan.

4.3 Animal Welfare

Matters relating to the welfare of livestock, companion animals and wildlife (including feeding

and rescue) are to be referred to DEPI.

Requests for emergency supply and/or delivery of fodder to stranded livestock or for livestock

rescue are passed to DEPI.

Matters relating to the welfare of wildlife are to be referred to DEPI.

Mansfield Shire has recently developed an emergency management animal welfare sub plan

that should be consulted for details of animal shelter compound and other pet, stock and

animal welfare arrangements.

4.4 Transition from Response to Recovery

VICSES as the Control Agency is responsible for ensuring effective transition from response to

recovery. This transition will be conducted in accordance with existing arrangements as

detailed in Part 3 Section 3.10 of the EMMV.


APPENDIX A - FLOOD THREATS FOR Mansfield Shire

General

The maps at Appendix F identify the portion of the Mansfield Shire, with more a detailed plan for the Jamieson & Mansfield Townships that may be subject to

inundation.

This information is based on historical data and studies undertaken in 2002, 2005 & 2006 and detailed within the following studies. Jamieson Flood Scoping

Study Final report 2003, Mansfield Flood Study 2005 and Mansfield Flood Study Extension April 2006. The Mansfield Flood Mapping Study was completed in 2013 for

the 1% AEP flood, which extends flood mapping to Ogilvies Road to the south, Maroondah Highway to the east and Graves Road to the west.

These provide predictions from the 10% AEP event (10 year ARI) through to the 1% AEP (100 year ARI) for Mansfield and Jamieson. The maps place particular

emphasis on the pre-existing known ‘low-lying’ dwellings particularly within Jamieson and the Jamieson Caravan Park known to be subject to inundation.

There are only a small number of properties (4) in the Mansfield town area which would be inundated during the design 10% AEP event, potentially rising to

20 properties for the 1% AEP flood. It is estimated that less than five dwellings would flood above floor during a 1% AEP flood.

In the case of Jamieson, a township of approximately 200 allotments a significant proportion of the area as detailed below could be impacted together with

potential isolation. Studies conducted by Sinclair Knight Merz in 2003 identify that for the 5% AEP event (20 year ARI flood), 19 properties would be subject to

flooding – together with up to 70 caravans, rigid annexes and 8 cabins within the caravan park. For the 1% AEP event the number of properties impacted

increased to 29 - and the entire caravan park (with the exception of the owner’s residence).

Throughout the Municipality, a number of roads are subject to inundation either by the presence of Bridges over rivers, ‘Road fords’, floodways or their low lying

position. The potential consequences of driving through floodwaters include increased property damage and possible loss of control - risking the lives of the

vehicle occupants – and subsequent rescuers. Floodwater is dangerous and the SES recommends to never drive, walk or ride through floodwater.

Another significant issue with flooded roads is that assistance may be delayed by impassable roads and those proposing to render assistance need to be aware

in advance of likely interruption & depth to main transport routes. Appendix F (Municipal Map) displays likely flood location and depth based on the 1% AEP

flood.

Historic Floods

The recorded flood in Jamieson occurred during September 2010 and is estimated as a 1% AEP event. The highest recorded flood in Mansfield occurred during

September 1975 and is estimated as a 1% AEP event. On each occasion short duration flooding occurred overnight peaking soon after midnight and receding

early the following morning.


Significant Floods since 1968

Month year Jamieson Upper Goulburn Goulbourn @ Eildon Ford Creek @ Mansfield

Peak Stage

(Metres)

Equivalent

AEP %

Peak Stage

(Metres)

Equivalent

AEP %

Peak Stage

(Metres)

Equivalent

AEP %

Peak Stage

(Metres)

Equivalent

AEP %

September 2010 4.76 1 5.12 1

October 2000 2.95 25

Sept 1998 4.47 4.66 1.29 100

October 1996 4.06 5 3.71 12 3.25. 50 3.08 20

June 1995 4.00 3.33 20 0.74 <100 3.28 14

October 1993 3.69 2.07 62 5.05 17 3.99 3

September 1993 2.66 3.86 12 4.82 20

July 1986 3.69 3.56 17 0.55 <100

September 1975 4.34 1

May 1975 4.05 5 0.94 100 1.76 100

August 1970 3.42

October 1968 4.16 3.84 12 1.59


Description of Major Waterways and Drains

Waterway or Drain Description

Goulburn River above Lake Eildon

Goulburn River rises in the western end of the Victoria Alps, near Woods Point at an elevation of about 811m, and flows into Lake Eildon merging with the Jamieson River at an elevation of 293m. The Mansfield Woods Point Road follows the alignment of the river from Jamieson township to the area above Kevington and Gaffneys Creek, then the creek before reconnecting with the river at Woods Point. The road is subject to inundation and riverine floodwater impact / damage.

Jamieson River

The Jamieson River starts below Potato Patch at an elevation of 491m and ends near Jamieson at an elevation of 293m at its confluence with the Goulburn River. The Jamieson River drops around 197m over its 33km length. The level of the Jamieson River at its junction with the Goulburn River is affected by complex factors such as wind effects, the likelihood of the Lake Eildon being at or near full supply level and any local effects of floodwaters entering Goulburn Inlet. It should be noted that the width of the Goulburn Inlet (into Lake Eildon) is of the order of 50 to 100 metres, and one would expect local flood surge effects.

Ford Creek

The Ford Creek catchment is upstream of Mansfield. The Midland Highway from Benalla crosses the creek at the Highett Street Bridge in Mansfield. On the eastern side of the town the Monier Bridge connects the township to the Mansfield Whitfield Road leading through Tolmie. Fords Creek is also adjacent to the intersection of the Mansfield Mt Buller road and the Mansfield Woods Point Road intersection – opposite Walsh’s airstrip (DEPI Airbase). The catchment headwaters are located 13 km east of Mansfield. The catchment falls from 770 metres AHD at its eastern most point to 320 metres AHD at Mansfield. The catchment is largely cleared, with generally only low density scattered trees remaining. Grazing is the predominant land use within the catchment. Ford Creek outfalls into Lake Eildon approximately 7 km downstream of Mansfield.

Delatite River

The Delatite River rises between the ski resort mountains of Mount Sterling and, Mount Buller. Flowing generally westwards, it passes the town of Merrijig before reaching Lake Eldon. It crosses Mansfield Woods Point Road at Piries and the Howes Creek Road at Bracks Bridge near the northerly approach to Goughs Bay. The river supplies township water to the upper Merrijig area (offtake near Carters Road Sawmill Settlement with no reservoir) and Mansfield township - Killarney Lane area is the offtake and 3 reservoirs

Lake Eildon A major water storage reservoir with a Full supply volume of 3,341,580 ML Located on the Goulburn River in its upper catchment, immediately below the junction with the Delatite River, the Big River, the Jamieson river the Howqua River and numerous Creeks.


Dam Failure

Flooding resulting from failure of the following dams is likely to cause minimal short term community issues within the Mansfield Shire as the dam / reservoir walls are

located on the Municipalities boundaries, however the neighbouring shires and the State would be significantly affected.

The following supporting documentation is available from the VICSES Regional HQ Office and the Dam Operators .

Dam Safety Emergency Plan for Lake Nillahcootie doc no 3304280

Dam Safety Emergency Plan for Lake Eildon doc no 3026344

Location Owner Dam Height Dam Capacity Comments

Lake Eildon Goulburn Murray Water

Embankment height

79m existing and 84.25m with raise including parapet wall

Full supply volume

3,341,580 ML

Located on the Goulburn River in its upper catchment, immediately below the junction with the Delatite River, the Big River, the Jamieson river the Howqua River and numerous Creeks.

Lake Nillahcootie Goulburn Murray Water

Embankment height

35m

Full supply volume

40,400 ML Situated on the Broken River 36km south of Benalla.


APPENDIX B

TYPICAL FLOOD PEAK TRAVEL TIMES

Stream flow gauges are located within a few kilometres of Jamieson, with an automated gauge located on the Goulburn River and a manual gauge on the Jamieson

River. There is therefore no effective warning time available from these gauges. The catchment above Jamieson on the Goulburn River is 694 km2 and on the

Jamieson River is 368 km2. It is likely that large rainfall episodes in the similar ‘High Country’ catchment would result in river rises in Jamieson in around 12 to 24

hours. Therefore the community/agency reaction to local observations and the BoM’s flood watch and severe thunderstorm services is paramount.

It is recommended that a study determining the relationship between rainfall and river gauge height should be undertaken to improve warnings for Jamieson

Although the Delatite River is not ‘close’ the Mansfield township, the river gauge on the Delatite River near Piries (Tonga) will provide advance warning of general

catchment conditions in the Mansfield area and the likely replicated conditions of the Fords Creek and upstream area and potential roadway inundation leading north,

south and east from Mansfield

The catchment to Mansfield township is less than 100 km2 and therefore the time from rainfall to flood commencing is likely to be around 6 hours for large floods like

that occurred in 1975.

Estimates of the time of concentration, i.e., the time taken for rainfall to travel through the catchment as streamflow, are presented below. These have been estimated

using standard engineering equations as outlined in the ‘Comments’ section. These estimates generally agree with the historic observations presented above.

Location From Location To Typical Travel Time Comments

Start of rainfall – Goulburn River

catchment Jamieson Approximately 7.2 hours Estimated using Australian Rainfall & Runoff Time of Concentration calculations.

Start of rainfall – Jamieson River

catchment Jamieson Approximately 19 hours Estimated using Bransby-Williams Time of Concentration calculations.

Start of rainfall – Fords Creek catchment

Mansfield Approximately 4.5 hours Estimated using Australian Rainfall & Runoff Time of Concentration calculations.


HYDROLOGICAL DATA

Available rainfall and stream flow data for the upper part of the Goulburn River is presented in the diagram below. Data Collection Network

Note – It should be noted that only the gauge at Doherty’s on the Goulburn has Flood Class Levels accepted by BoM and as such warnings for this River will be issued

by BoM as part of its flood warning system. Whilst the gauge at Gerran’s is a telemetry gauge it does not have established Flood Class Levels so warnings by BoM

cannot be issued for the Jamieson River.

Note – In Flash Flood areas without gauges, it will only be possible to provide a general description of likely flood impacts.


GOULBURN BASIN (Ref Thiess Environmental Services (Feb 1999): Flood Warning Station Manual)

GOULBURN RIVER, DOHERTYS STATION 405219

GAUGE ZERO 298.44 m AHD Highest recorded flow 15,300 ML/d 302.21 m AHD Frequency 10 % AEP

Catchment Area 694 km2 Station Location 6 km upstream of Jamieson-Woods Point Road

Description Mountainous Station Operating Period Site A – Aug 1954 to date

Information below is subject to periodic revision.

Date/Event Gauge Height at Current Site Flow Frequency Comments

m m AHD ML/d AEP %

6.00 304.44 Major flood (BOM)

1% AEP (Sep 2010) 5.33 303.77 22,600 1

2% AEP flood 4.94 303.38 20,700 2

Sep 1998 4.66 303.1 19,300

4% AEP I flood 4.53 302.97 18,700 4

Aug 1958 3.93 302.37 15,800

10 % AEP flood 3.89 302.33 15,600 10

Sep 1993 3.86 302.3 15,500 10

Oct 1968 3.84 302.28 15,400 10

Oct 1996 3.71 302.15 14,800

Jul 1974 3.58 302.02 14,200

3.50 301.94 13,800 Moderate flood (BOM)

20% AEP flood 3.31 301.75 13,000 20

2.00 300.44 7,100 <50 Minor flood (BOM)



GOULBURN BASIN (Ref Thiess Environmental Services (Feb 1999): Flood Warning Station Manual)

DELATITE RIVER, TONGA BRIDGE STATION 405214

Gauge Zero 312.76 m AHD Highest recorded flow 11,000 ML/d 316.58 m AHD Frequency <20 % AEP

Catchment Area 368 km2 Station Location 3 km from junction of Mansfield Jamieson Road

Description Hilly farmland to mountainous Station Operating Period Site A – Feb 1947 to date

Information below is subject to periodic revision.

Date/Event Gauge Height at Current Site Flow Frequency Comments

m m AHD ML/d AEP %

Sep 1975 5.71 318.47 40,500 >1

1 % AEP flood 5.51 318.27 34,300 1

Dec 2010 5.4 318.16 31,050

2 % AEP flood 5.33 318.09 29,400 2

Oct 1993 5.10 317.86 24,000

4 % AEP flood 5.13 317.89 24,600 4 Minor discrepancy in Thiess data

Dec 1966 5.02 317.78 22,300

5.0 317.76 21,800 Major flood (BOM)

Oct 1992 4.79 317.55 19,200

Nov 1954 4.69 317.45 18,100

10 % AEP flood 4.72 317.48 18,500 10 Minor discrepancy in Thiess data

Oct 1996 4.51 317.27 16,100

20 % AEP flood 4.21 316.97 13,900 20

4.0 316.76 12,400 20 Moderate flood (BOM)

3.0 315.76 6,900 <50 Minor flood (BOM)



APPENDIX C1 – Mansfield Township - FLOOD EMERGENCY PLAN

Overview of Flooding Consequences

The township of Mansfield is located on the fringe of the Ford Creek floodplain, 5 km east of Lake Eildon. Past flooding at Mansfield has occurred most notably in 1975 and 1993 leading to flooding of existing development in low lying areas including inundation of some houses. The creek has a catchment area of 84 km

2 at the Highett

StreetBridge in Mansfield. The township has a population of 2,300. The catchment headwaters are located 13 km east of Mansfield. The catchment falls from 770 metres AHD at its eastern most point to 320 metres AHD at Mansfield. The catchment is largely cleared, with generally only low density scattered trees remaining. Grazing is the predominant land use within the catchment. Ford Creek outfalls into Lake Eildon approximately 7 km downstream of Mansfield. The only stream-flow measurement station on Ford Creek is located midway between Mansfield and Lake Eildon. Prior to 1993, the creek channel had extensive willow growth within the township. Extensive willow removal works were undertaken during and after 1993 to address both the bank stabilisation and discharge capacity issues associated with the willows choking the creek. Existing development is located on much of the southern fringe of the floodplain. More recent development on the north side of the creek upstream of Highett Street is located on high ground above the floodplain. The most vulnerable areas in Mansfield are located along Baldry Street, the north-eastern end of Alisa Street near Rowe Street, and east toward Greenvale Lane.

Overview of Flood Characteristics

The 1975 flood characteristics are described as follows:

Moderate flood event occurred 5 days prior to the main flood, peaking at 81 m3/s on the 13 September 1975.

41 mm of rainfall was recorded at the Mansfield Post Office gauge in the 72 hours to 09:00 on 15 September 1975.

24 hour rainfall recorded at the Mansfield post office prior to 9.00am on the 18 September 1975 was 53 mm.

Main flood peaked at 12.20am on the 18 September 1975, with a peak flow of 232 m3/s recorded at the gauging station.

The time taken from when the creek water level started to rise at the gauging station, to peak flow, was approximately 6 hours.

Peak flow had receded to 77 m3/s by 6.00am on the 18 September 1975.

The September 1975 flood was over within a period of approximately 12 hours during the night.


The 1993 flood characteristics are described as follows:

Minor flood peaks experienced on 2 September (42 m3/s), 8 September (56 m3/s) and 15 September (51 m3/s) prior to the main flood event in early October

1993.

Main flood peaked at 12.30am on the 4 October 1993, with a peak flow of 167 m3/s recorded at the gauging station.

24 hour rainfall recorded at the Mansfield post office prior to 9.00am on the 4 October 1993 was 113 mm (highest 24 hour total on record dating back to 1901).

Flood level rose over a period of approximately ten hours prior to peaking 30 minutes after midnight.

Peak flow had receded to 67 m3/s by 6.30am on the 4 October 1993

The 1993 flood was therefore similar to the 1975 flood in that it rose and fell during the night.

Properties affected

The following buildings are known to have been subject to past above floor flooding based on discussions with residents and / or Council staff during the course of the Mansfield 2005 flood study.

House on the south side of the High Street, Mansfield-Whitfield Road and Mount Battery Road intersection (no 10 Mt Battery Road). This house is reported to

have been flooded to above floor level in the 1975 and 1993 flood events.

Buildings on the north side of Ailsa Street between Rowe Street and New Street. In particular, the houses at addresses No. 9 and 11 Ailsla Street are reported

to have been flooded to above floor level in the 1956, 1975 and 1993 floods. House at 9 Ailsa Street was flooded to a depth of ‘6 to 9 inches’ in the 1975 flood.

Residents of the house at 11 Ailsa Street since 1942 have advised that the house has been flooded on three occasions, 1956, 1975 and 1993. Flooding most

severe in the 1975 flood.

House located 70 metres south west of the High Street Bridge (4 High Street). This house is reported to have been flooded to above floor level in 1975 and

1993. House at 4 High Street (house closest to west side of creek on the upstream side of High Street) was flooded to above floor level in the 1993 and 1975

floods.

Major roads affected

Dead Horse Lane (west of Midland Hwy) overtopping threshold is equivalent to less than a year ARI flood.

Highett Street (Midland Highway) overtopping threshold is equivalent to a 10-year ARI flood. Highett Street Bridge. Constructed in 1939. Only marginally

perched with 30 metre span. Overtopped in 1975 and 1993.


High Street (Mansfield Whitfield Road) overtopping threshold is equivalent to between a 2 to 5-year ARI flood.

Mount Battery Road overtopping threshold is equivalent to a 5-year ARI flood.

Greenvale Lane overtopping threshold is equivalent to a 2-year ARI flood.

Flood Mitigation

There are no flood mitigation plans for Mansfield other than to introduce new flood overlays (LSIO, and FO) and UFZ.

Flood Impacts and Required Actions

There are currently no telemetered rainfall or river gauges within the Ford Creek catchment upstream of Mansfield however the existing gauge at the Delatite River provides some relevance both the Mansfield and also to a couple of properties in the Merrijig area and downstream of the Tonga Bridge on the Delatite River floodplain . The presence of a telemetered rainfall gauge above Mansfield Township is desirable to provide an improved means for estimating the impending severity of flooding aside from relying on rainfall recorded at Mansfield. The presence of a telemetered rainfall gauge will however only marginally increase the duration of flood warning time available, given the relatively small size of the Ford Creek catchment upstream of Mansfield.

Note – In Flash Flood areas without gauges, it will only be possible to provide a general description of likely flood impacts.

The following flood intelligence card incorporates known intelligence on Ford Creek. The rainfall data was collected at the Mansfield Post Office Rain Gauge, and are

used as a guide only. Impacts linked to rainfall data are inaccurate and will change depending on the catchment conditions at the time of the rainfall.


AEP Peak Stage Meters

Date Rainfall

(mm/24 hr)

@ 9AM for 24hrs Recorded at Mansfield Post Office

Peak Flow

Rates

Consequence / Impact Action Source

100%<

Dead Horse Lane (west of Midland Hwy) overtopping threshold is equivalent to less than a 1-year ARI flood.

Monitor and consider detours Mansfield Flood Study

50% Greenvale Lane overtopping threshold Monitor and consider detours Mansfield Flood Study

2.95 25th

Oct 2000

50.2mm October 2000 Flood Event

Between 50 to 20%

High Street (Mansfield Whitfield Road) overtopping threshold


20% 3.08m 1st Oct 1996

29mm

October 1996 Flood Event

Mount Battery Road overtopping threshold


2nd

Sept 1993

27 mm 42 m3/s

1993 Flood

9th

Sept 1993

27 mm 56 m3/s

1993 Flood

15th

Sept 1993

31 mm 56 m3/s

1993 Flood



Date Rainfall

(mm/24 hr)


Peak Flow

Rates


3.99

4th

Oct 1993

113 mm 67 m3/s

1993 Flood

9 and 11 Ailsa Street, 10 Mt Battery Road and 4 High Street are reported to have been flooded to above floor level

Highett Street Bridge overtopped

Monitor and consider warnings and evacuation of property

Monitor and consider detours

Mansfield Flood Study

20%

74m3/s

Peak generally 0.8 metres below the 1% flood level

Refer to Table 5.1 in Flood Study (Page 18) and mapping in Figure A1 of Appendix A of the Mansfield Flood Study


10%

102 m3/s



Highett Street (Midland Highway) overtopping threshold. Overtopped in 1975 and 1993



5%

134 m3/s




2%

183 m3/s






Date Rainfall

(mm/24 hr)


Peak Flow

Rates


1%

4.35m

13th

to 15

th Sept

1975

41 mm

(Accumulated 3 day total)

81 m3/s

1975 Flood

Refer to Mapping in Appendix A of the Mansfield Flood Study

9 and 11 Ailsa Street are reported to have been flooded to above floor level

9 Ailsa Street reported to have 6 to 9 Inches of water over floor

10 Mt Battery Road reported to have been flooded to above floor level

4 High Street reported to have been flooded to above floor level

Former property located at 17 Baldry Street reported to have flooded to above floor level Highett Street Bridge overtopped

Monitor and consider warnings and evacuation of property


18th

Sept 1975

53 mm 232 m3/s

@ 0020hrs


Command, Control and Coordination

Refer to the VICSES regional flood plan for command and control arrangements for flooding.


APPENDIX C2 – Jamieson - FLOOD EMERGENCY PLAN


Located at the head of the Goulburn River, where the Upper Goulburn and Jamieson Rivers join Lake Eildon, Jamieson has a permanent population around 100 to

125. Jamieson has experienced numerous floods, although little documentary evidence is available. Many of the dwellings in Jamieson are holiday homes for non-

resident owners. The Jamieson Caravan Park is situated on the banks of Jamieson River on Grey Street and has a history of flooding.

Flood behaviour at Jamieson has been influenced by the formation of Lake Eildon (3,390 GL capacity) in the 1950s, which, when full, will affect flood levels in the lower

reaches of the Upper Goulburn and Jamieson Rivers. Prior to 1950, a smaller lake existed behind the current lake - Sugarloaf Reservoir (377,000 ML capacity)

constructed after the 1912-1914 drought. The comparatively recent September 1998 flood was the second largest flood in recent times behind the September 2010.

Fortuitously, a number of flood levels were pegged and surveyed.

General overview of flooding consequence

Item Items inundated Estimated population affected

Land Inundated in a 5 % AEP flood

Buildings 19 properties 48

Roads (Including Caravan Park)

0.33 km sealed roads

0.64km unsealed roads

Caravan Park

70 Caravans

8 cabins

1 ablutions block

100


Item Items inundated Estimated population affected

Land inundated in a 1 % AEP Flood

Buildings 27 properties 68

Roads (Including Caravan Park)

0.42 km sealed roads

0.75 km unsealed roads

Caravan Park

70 Caravans

8 cabins

1 ablutions block

Flood Mitigation

There are no flood mitigation plans for Jamieson other than to introduce new flood overlays (LSIO, and FO) and the introduction of ‘Community flood observers’. The

SES is also developing a Local Flood Guide with the community to be delivered in the 2014 Calendar year.


There is limited verified intelligence available on the effects of flooding in Jamieson, during future events efforts should be made to record and validate impacts and

consequences.


The Jamieson Caravan Park maintains its own emergency plan and early contact with the park management is advised.

Height Frequency

AEP %

ML/d & Date Effect Action Source

Flood Watch Jamieson Caravan Park starts monitoring conditions and enacting emergency plan

Jamieson Caravan Park Emergency Plan

2.0m <50 7100 Minor Flood Class Level BoM

3.31m 20 13000

3.50m 13800 July 74 Moderate Flood Class Level Jamieson Caravan Park considers relocating vulnerable caravans and vehicles, and considers evacuation.

BoM Jamieson Caravan Park Emergency Plan

4.06m 5 Oct 96 Jamieson Caravan Park Patrons

evacuated some annexes flooded; no vans

flooded 50% of site inundated.

Liaise with Jamieson Caravan Park re emergency

plan and evacuation’s

Jamieson Caravan Park

Emergency Plan

4.66m 19300 Sept 98

5.33m 1 22600 Sept 10

6.0m Major Flood Class Level BoM

APPENDIX C3 – Tonga Bridge FLOOD EMERGENCY PLAN


Tonga Bridge Gauging Station is situated on the Delatite River along the Piries Gough Bay Road some 2.5 km west of the Mansfield-Woods Point Road. Flooding at

this location is likely to affect the Mansfield Woods Point Road at Piries. Flood depth indicator posts installed at this crossing by Vic Roads as Road Authority in 2010.

This route is critical for the effective movement of Emergency Services during flooding events to Jamieson. When this river is in flood it may have the effect of cutting


the road between the 2 communities, potentially isolating Jamieson from the Local SES unit. For this reason Tonga Bridge is referred to separately in this plan to

identify when road access may be cut. River flooding likely to have impact on a small number of dwellings on allotments along the river frontage back in Merrijig area

and downstream toward Goughs Bay. Piries Gough Road likely to be impassable together with the Bracks Bridge crossing been inundated


There is limited verified intelligence available on the effects of flooding at Tonga Bridge, during future events efforts should be made to record and validate impacts and

consequences.

Gauge Location: Delatite River at Tonga Bridge Refer to Appendix B – Hydrologic Data Section for more information

Height Frequency AEP % Date & ML/d Effect Action

3.0m <50 6900 Minor Flood Class Level

4.0m 20 12400 Moderate Flood Class Level

5.0m 5 21800 Major Flood Class Level

5.51 1 34300

Command, Control and Coordination

Response to flood impacts at Tonga Bridge will be managed from the SES Sector Command located at the SES LHQ Mansfield.


APPENDIX D - FLOOD EVACUATION ARRANGEMENTS

Flood Evacuation Arrangements will be developed for at risk locations in forthcoming revisions to this plan.

Phase 1 - Decision to Evacuate

The Incident Controller may make the decision to evacuate an at-risk community under the

following circumstances:

Properties are likely to become inundated;

Properties are likely to become isolated and occupants are not suitable for isolated

conditions;

Public health is at threat as a consequence of flooding and evacuation is considered the

most effective risk treatment. This is the role of the Health Commander of the incident to

assess and manage. Refer to the State Health Emergency Response Plan (SHERP) for

details);

Essential services have been damaged and are not available to a community and

evacuation is considered the most effective risk treatment.

The following should be considered when planning for evacuation:

Anticipated flood consequences and their timing and reliability of predictions;

Size and location of the community to be evacuated;

Likely duration of evacuation;

Forecast weather;

Flood Models;

Predicted timing of flood consequences;

Time required to conduct the evacuation;

Time available to conduct the evacuation;

Evacuation priorities and evacuation planning arrangements;

Access and egress routes available and their potential flood liability;

Current and likely future status of essential infrastructure;

Resources required to conduct the evacuation;

Resources available to conduct the evacuation;

Shelter including Emergency Relief Centres, Assembly Areas etc.;

Vulnerable people and facilities;

Transportation;

Registration

People of CALD background and transient populations;

Safety of emergency service personnel;

Different stages of an evacuation process.


The decision to evacuate is to be made in consultation with the MERO, MERC, DHS, Health

Commander and other key agencies and expert advice (CMA’s and Flood Intelligence specialists).

Phase 2 – Warning

Warnings may include a warning to prepare to evacuate and a warning to evacuate immediately.

Once the decision to evacuate has been made, the at-risk community will be warned to evacuate.

Evacuation warnings can be disseminated via methods listed in part 3 of this plan.

Evacuation warning messages will be developed and issued by VICSES in consultation with the

MERO, MERC, DHS and other key agencies and expert advice (CMA’s and Flood Intelligence

specialists).

Phase 3 – Withdrawal

Withdrawal will be controlled by VICPOL. VICSES will provide advice regarding most appropriate

evacuation routes and locations for at-risk communities to evacuate to, etc.

VICSES, CFA, AV and Local Government will provide resources where available to support

VICPOL/VICROADS with route control and may assist VICPOL in arranging evacuation

transportation.

VICPOL will control security of evacuated areas.

Evacuees will be encouraged to move using their own transport where possible. Transport for

those without vehicles or other means will be arranged

Special needs groups will be/are identified in Council’s ‘residents at risk’ register. This can be done

through community network organisations. Further information on Council’s ‘residents at risk’

register can be obtained from Mansfield Shire.

Phase 4 – Shelter

Relief Centres and/or assembly areas which cater for people’s basic needs for floods may be

established to meet the immediate needs of people affected by flooding. These are listed in the

MEMP.

VICPOL in consultation with VICSES will liaise with Local Government and DHS (where regional

coordination is required) via the relevant control centre to plan for the opening and operation of

relief centres. This can best be achieved through the Emergency Management Team (EMT).

Animal Shelter

Animal shelter compounds will be established for domestic pets and companion animals of

evacuees. These facilities may be at locations detailed in the Animal Welfare Plan

Phase 5 – Return

Return will be consistent with the Strategic Plan for the Return of Community

The Incident Controller in consultation with VICPOL will determine when it is safe for evacuees to

return to their properties and will arrange for the notification of the community.

VicPol will manage the return of evacuated people with the assistance of other agencies as

required.


Considerations for deciding whether to evacuate include:

Current flood situation;

Status of flood mitigation systems;

Size and location of the community;

Access and egress routes available and their status;

Resources required to coordinate the return;

Special needs groups;

Forecast weather;

Transportation particularly for people without access to transport

Disruption to Services

Disruption to a range of services can occur in the event of a flood. This may include road closures

affecting school bus routes, water treatment plant affecting potable water supplies etc.

Essential Community Infrastructure and Property Protection

Essential Community Infrastructure and properties (e.g. residences, businesses, roads, power

supply etc.) that require protection are:

Rescue

The following resources are available within Mansfield to assist with rescue operations:

VICPOL are the control agency for rescue and may deploy resources as appropriate including

Search and Rescue and Water Police teams.

Additionally the Mansfield SES unit maintain a Boat Capability. Other SES boat recourses are able

to be deployed at the request of the Incident Controller.


APPENDIX E - FLOOD WARNING SYSTEMS

Flood Warning

Flood Warning products and Flood Class Levels can be found on the BoM website. Flood Warning

Products include Severe Thunderstorm Warnings, Severe Weather Warnings, Flood Watches and

Flood Warnings.

Flood Bulletins

VICSES distributes flood emergency information to the media through “Flood Bulletins”. Flood

Bulletins provide BoM Flood Warning information as well as information regarding possible flood

consequences and safety advice, not contained in BoM Flood Warning products. VICSES uses the

title Flood bulletin to ensure emphasis is placed upon BoM Flood Warning product titles.

The relevant VICSES Region Headquarters or the established ICC will normally be responsible for

drafting, authorising and issuing issue Flood Bulletins, using the One Source, One Message

system.

Flood Bulletins should refer to the warning title within the Bulletin header, for example Flood

Bulletin for Major Flood Warning on Yarra River.

Flood Bulletins should follow the following structure

What is the current flood situation;

What is the predicted flood situation;

What are the likely flood consequences;

What should the community do in response to flood warnings;

Where to seek further information;

Who to call if emergency assistance is required.

It is important that the description of the predicted flood situation is consistent with and reflects the

relevant BoM Flood Warning.

Flood Bulletins should be focused on specific gauge (or in the absence of gauges, catchment)

reference areas, that is the area in which flood consequences specifically relate to the relevant

flood gauge.

Flood Bulletins should be prepared and issued after receipt of each Flood Watch and Flood

Warning from the BoM, or after Severe Weather or Thunderstorm Warnings indicating potential for

severe flash flooding.

To ensure flood bulletins are released in a timely manner, standardised flood bulletins may be

drafted based on different scenarios, prior to events occurring. The standardised flood bulletins

can then be adapted to the specifics of the event occurring or predicted to occur.


APPENDIX F – MAPS

The following studies available on http://www.ga.gov.au/flood-study contain further mapping and images:

Jamieson Flood Scoping Study Final report 2003 (AFSID 1916)

Mansfield Flood Study 2005 (AFSID 2685)

Mansfield Flood Study Extension April 2006 (AFSID 2686)

Mansfield Flood Mapping Study Draft (GBCMA, 2013)

http://www.ga.gov.au/flood-study


Map 1 – Upper Goulburn Catchment


Map 2 – Mansfield 1% AEP flood


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Flood Emergency Plan - Shire of Mansfield Flood... · This Municipal Flood Emergency Plan is a result of the cooperative efforts of the Mansfield Shire Flood Planning Committee (MFPC)