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Yarriambiack Shire Council Flood Response Plan

A Sub Plan of the Municipal Emergency Management Plan

September 2009

Yarriambiack Shire Council Flood Response Plan September 2009 Page i

AUTHORITY: The Yarriambiack Shire Council Flood Response Plan has been produced pursuant to Part 4 of the Emergency Management Act 1986 (as amended) and is a sub plan of the Municipal Emergency Management Plan (MEMP).

PRESENTATION: This Plan is to be presented in loose-leaf form and inserted as a sub document in the MEMP 2-ring binder.

PURPOSE AND SCOPE: This Plan details agreed arrangements for the minimisation of the effects of, preparedness for, response to and recovery from flood incidents within the Yarriambiack Shire Council area and as such covers operations for all levels of flooding within the Municipality.

Details of flood problem areas or ‘hot spots’ within the Municipality at various river levels along with emergency response actions are provided at Appendix A while properties likely to experience flooding are listed in Appendix B.

This Plan should be read in conjunction with the Yarriambiack Shire Council MEMP.

RESPONSIBILITIES: This Plan is predicated on the responsibilities of agencies and other entities during flood being as detailed in the current version of the Emergency Management Manual Victoria.

REFERENCES: References are listed at the end of this document.

AUDIT: This Flood Response Plan is a sub plan of the Yarriambiack Shire Council MEMP and as such is subject to the audit provisions laid down in legislation and applicable to the MEMP.

DOCUMENT UPDATE: Changes to this Plan will be forwarded to all registered copy holders as and when required. Copy holders are to replace, insert or delete pages according to instructions.

This is a “live” document and must be routinely reviewed and updated.

- C O N T E N T S -

Yarriambiack Shire Council Flood Response Plan September 2009 Page ii

Page

Distribution List.................................................................................................................................................. iv

Amendment Certificate...................................................................................................................................... vi

List of Abbreviations and Acronyms ..................................................................................................................vii PART 1 – INTRODUCTION 1. Municipal Endorsement ...................................................................................................................1

2. Purpose and Scope of the Flood Response Plan ...............................................................................2

3. Audit Requirements.........................................................................................................................2

4. Flood Response Plan Sub-Committee Membership............................................................................2

5. Policy .............................................................................................................................................2

PART 2 – THE MUNICIPALITY

1. General ..........................................................................................................................................4

2. Overview of River Systems in the Municipality ...................................................................................4

3. Overview of Flood History ................................................................................................................4

4. Overview of Flooding Issues ............................................................................................................4

5. Availability of Flood Related Data .....................................................................................................5

PART 3 – MANAGEMENT ARRANGEMENTS 1. Municipal Responsibility...................................................................................................................6

2. Control Authority .............................................................................................................................6

3. Municipal Emergency Response Coordinator (MERC)........................................................................6

4. Flood Emergency Management Team...............................................................................................6

5. Command, Control & Coordination ...................................................................................................6

6. Municipal Emergency Coordination Centre (MECC) ...........................................................................6

7. Flood Operations Centre (FOC)........................................................................................................7

8. Debriefing Arrangements .................................................................................................................7

9. Flood Information and Warnings .......................................................................................................7

10. Response / Recovery Hand Over .....................................................................................................8

11. Maintenance of this Flood Response Plan .........................................................................................8

12. Frequency and Purpose of Flood Response Plan Sub-Committee Meetings.........................................8

PART 4 – PREVENTION / PREPAREDNESS ARRANGEMENTS 1. General ..........................................................................................................................................9

2. Community Awareness ....................................................................................................................9

3. Flood Warning and Monitoring Systems ............................................................................................9

3.1 Wimmera River....................................................................................................................9

3.2 Yarriambiack Creek and Dunmunkle Creek......................................................................10

4. Land Use Planning ........................................................................................................................10

5. Flood Mitigation Schemes ..............................................................................................................10

6. Flood Protection............................................................................................................................10

6.1 Residents ............................................................................................................................10

6.2 Planning Permits and Construction of New Levees...........................................................10

6.3 Rural Dwellings .................................................................................................................11

6.4 Farm Land ..........................................................................................................................11

6.5 Liability..............................................................................................................................11

6.6 Maintenance of Approved Levees .....................................................................................11

6.7 Maintenance of Private Levees ..........................................................................................11

6.8 Sandbags ............................................................................................................................11

7. Recording of Flood Information.......................................................................................................11

PART 5 – RESPONSE ARRANGEMENTS 1. Introduction ..................................................................................................................................13

1.1 Activation of Response ......................................................................................................13

1.2 Municipal Involvement ......................................................................................................13

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Yarriambiack Shire Council Flood Response Plan September 2009 Page iii

1.3 Escalation ...........................................................................................................................13

1.4 Stand Down........................................................................................................................13

2. Flood Triggers ..............................................................................................................................13

3. Flood Monitoring and Warning Systems ..........................................................................................13

3.1 General ...............................................................................................................................13

3.2 Flood Watch.......................................................................................................................13

3.3 Flood Warnings..................................................................................................................14

3.4 Dissemination.....................................................................................................................14

4. When Flooding is Considered Likely ...............................................................................................14

5. Weirs along Yarriambiack Creek.....................................................................................................14

6. Dam Break ...................................................................................................................................15

7. Water Quality Issues .....................................................................................................................15

8. Flood Operation Centre (FOC) .......................................................................................................15

9. Public Information .........................................................................................................................16

10. Flood Bulletins ..............................................................................................................................16

11. Door Knocking ..............................................................................................................................16

12. Evacuation ...................................................................................................................................16

PART 6 – SUPPORT ARRANGEMENTS 1. General ........................................................................................................................................17

PART 7 – RECOVERY ARRANGEMENTS 1. General ........................................................................................................................................18

Appendix A Flood Intelligence...................................................................................................................19

Appendix B Properties Likely to be Flooded..............................................................................................34

Appendix C Flood History..........................................................................................................................55

Appendix D Guidelines for Flood Monitoring and Weir Operation for Yarriambiack Creek ........................57

Appendix E Flood Class Levels.................................................................................................................63

Appendix F Service Level Agreement .......................................................................................................64

Appendix G Information Flow Chart...........................................................................................................65

Appendix H Warning Dissemination ..........................................................................................................66

Appendix I Maps ......................................................................................................................................67

References.......................................................................................................................................................81

- D I S T R I B U T I O N L I S T -

Yarriambiack Shire Council Flood Response Plan September 2009 Page iv

Issued To:

Organisation Name

YSC MEMP Committee Executive Officer Helen Pollard

YSC Office Copy Strong Room

YSC Office Copy Photo-copying Room

YSC MEMP Committee Chairman Helen Ballentine

YSC MERO James Magee

YSC Deputy MERO Brian Poulton

YSC Deputy MERO Bernie Naylor

YSC Deputy MERO Mick Evans

YSC Deputy MERO Tony Brennan

YSC Deputy MERO Matt Wellington

YSC MRM Gavin Blinman

YSC Deputy MRM Olinda Poulton

YSC MECC YSC MECC

YSC EHO Tim Rose

YSC Works Superintendant Peter Jess

YSC Works Superintendant Chris Lehmann

YSC Service Centre Rupanyup

YSC Service Centre Gateway BEET, Hopetoun

YSC Emergency ‘Phone On-call Operator

YSC CEO Ray Campling

MERC (Warracknabeal Police Station) Bill Alford

Deputy MERC (Hopetoun Police Station) Phil McClure

DERC Brian Clarke (Stawell)

Ballarat – D24

Murtoa Police Station Pat Harrington

Wimmera CMA Clare Wilson

Mallee CMA

GWM Water

Ambulance Victoria (Ballarat) Sally (Grampians Regional Office)

Ambulance Victoria (Warracknabeal) Murray Crawford, Station Officer

Ambulance Victoria (Mildura) Kerry Strachan, Northern Mallee Group Manager

CFA (Warracknabeal Group) Colin Newell, Group Officer

CFA (Dunmunkle Group) Graeme Dunlop, Group Officer

CFA (Southern Mallee Group) Doug Afford, Group Officer

CFA (Region 17 Headquarters – Horsham) Dale Russell, Operations Manager

CFA (Region 18 Headquarters – Swan Hill) Rachel Rogers, Community Safety Manager

- D I S T R I B U T I O N L I S T -

Yarriambiack Shire Council Flood Response Plan September 2009 Page v

Issued To:

Organisation Name

VicRoads (Ballarat) Jim Kierce

Human Services Victoria (Ballarat) Chris Lyons, Manager Corporate Services

Bureau of Meteorology (Flood Warning)

VicSES (Region Headquarters – Ballarat) Tony Grimme, Regional Officer

VicSES (Region Headquarters – Ballarat) Stephen Warren, Regional Manager

VicSES (Warracknabeal Unit) Kevin Bowler, Unit Controller

VicSES (Rupanyup Unit) Hans Hormann, Unit Controller

VicSES (Woomelang Unit) Travis Mitchell, Unit Controller

Mildura Rural City Council Municipal Emergency Recovery Officer

Hindmarsh Shire Council Municipal Emergency Recovery Officer

Northern Grampians Shire Council Municipal Emergency Recovery Officer

Horsham Rural City Council Municipal Emergency Recovery Officer

Buloke Shire Council Municipal Emergency Recovery Officer

Rural Northwest Health (Warracknabeal) Catherine Morley-Nelson (CEO)

Dunmunkle Health Services (Minyip) Tracey Chenoweth

Woodbine Inc. Judith Drage

Municipal Health Officer Dr Donald Liu

Parks Victoria (DSE – Yaapeet) Mark Mellington, Ranger in Charge

Red Cross – Melbourne Adam Dent, State Manager Emergency Services

Red Cross – Horsham Emergency Support Liaison Officer

Emergency Management Institute Victoria (Mt Macedon) The Librarian

- A M E N D M E N T C E R T I F I C A T E -

Yarriambiack Shire Council Flood Response Plan September 2009 Page vi

1. This Flood Response Plan will be amended, maintained and distributed as required by the Yarriambiack Shire Council

2. Suggestions for amendments to this Plan should be forwarded to:

MERO Yarriambiack Shire Council 34 Lyle Street, WARRACKNABEAL VIC 3393

3. Amendments listed below have been included in this Plan and promulgated by YSC to all registered copy holders.

Amendment Number

Date of Amendment

Amendment Entered By

Summary of Amendment

- L I S T O F A B B R E V I A T I O N S A N D A C R O N Y M S -

Yarriambiack Shire Council Flood Response Plan September 2009 Page vii

The following abbreviations and acronyms are used in the Plan:

AEP Annual Exceedance Probability

ARI Average Recurrence Interval

ARMCANZ Agricultural & Resource Management Council of Australia & New Zealand

BoM Bureau of Meteorology

CEO Chief Executive Officer

CERM Community Emergency Risk Management

CFA Country Fire Authority

CMA Catchment Management Authority

CoM Weir Committees of Management

DNRE Department of Natural Resources & Environment (now DSE)

DO Duty Officer

DoI Department of Infrastructure

DPI Department of Primary Industries

DSE Department of Sustainability and Environment (successor body to DNRE)

ECC Emergency Coordination Centre

EMA Emergency Management Australia

EMMV Emergency Management Manual Victoria

FO Floodway Overlay

FOC Flood Operations Centre

GWMWater Grampians Wimmera Mallee Water

LSIO Land Subject to Inundation Overlay

Mallee CMA Mallee Catchment Management Authority

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

MRM Municipal Recovery Manager

PMF Probable Maximum Flood

SOP Standard Operating Procedure

VicPol Victoria Police

VICSES Victoria State Emergency Service

VFD Victorian Flood Database

Wimmera CMA Wimmera Catchment Management Authority

YCAC Yarriambiack Creek Advisory Committee

YCFMG Yarriambiack Creek Flood Monitoring Group

YSC Yarriambiack Shire Council

P A R T 1 – I N T R O D U C T I O N

Yarriambiack Shire Council Flood Response Plan September 2009 Page 2

2. Purpose and Scope of the Flood Response Plan

This Flood Response Plan aims to detail arrangements agreed for the minimisation of the effects of, preparedness for, response to and recovery from flood incidents within Yarriambiack Shire taking into account the results of:

♦ The Community Emergency Risk Management (CERM) process (see Part 4 Section 3 of the MEMP);

♦ Flood related Schedules to the Yarriambiack Planning Scheme as may exist for the various precincts of the Municipality; and

♦ The (likely) contents of floodplain management plans prepared in conjunction with the Wimmera and / or Mallee CMAs.

As such the objectives of the Plan are to:

♦ Bring about the implementation of measures to prevent or minimise the causes and impacts of flood incidents within Yarriambiack Shire;

♦ Document arrangements for the utilisation and implementation of resources from within the Municipality when required for flood response activities;

♦ Outline the management of support that may be provided to or from adjoining Municipalities during a flood event;

♦ Complement other Local, Regional and State emergency and wider planning arrangements with specific emphasis on those relevant to flood.

3. Audit Requirements

This Flood Response Plan is a sub plan to the Yarriambiack Shire Council Municipal Emergency Management Plan (hereafter referred to as the MEMP) and as such is subject to the audit provisions as detailed in Section 21A of the Emergency Management Act 1986 (as amended) including Audit arrangements 1995.

4. Flood Response Plan Sub-Committee Membership

Membership of the Yarriambiack Shire Council Flood Response Plan Sub-Committee will comprise representatives from the following agencies and organisations:

♦ Yarriambiack Shire Council (YSC);

♦ Yarriambiack Creek Flood Monitoring Group (YCFMG);

♦ Yarriambiack Creek Advisory Committee (YCAC);

♦ The weir Committees of Management (CoM);

♦ Victoria State Emergency Service (VICSES);

♦ Victoria Police (VicPol);

♦ Wimmera CMA;

♦ Mallee CMA;

♦ Department of Sustainability & Environment (DSE) and Department of Primary Industries (DPI);

♦ GWMWater;

♦ Country Fire Authority (CFA);

♦ VicRoads; and

♦ Other as invited.

5. Policy

1. This Flood Response Plan is prepared as a sub plan to the Yarriambiack Shire Council MEMP.

2. This Flood Response Plan will be considered in conjunction with other Local, Regional / Divisional and State emergency response plans and arrangements. It in no way supersedes or overrides agreed arrangements documented in the MEMP or directives issued by VICSES as the Control Agency for flood incidents.

3. This Flood Response Plan will be amended, maintained and distributed as required by Yarriambiack Shire Council.

4. In times of flood, priority will always be given to the protection of life, essential services, public utilities and property within the flood affected area.

5. The Yarriambiack Shire Council recognises the roles of, and will consult closely with, the relevant water and

P A R T 1 – I N T R O D U C T I O N


catchment management authorities (GWMWater and Wimmera and / or Mallee CMA) as well as with both the Control Agency (VICSES) and the principal recovery planning and management agency (Human Services Victoria) on any issue involving flooding and, most particularly, at any time during a flood event.

6. Yarriambiack Shire Council recognises the key roles of the Yarriambiack Creek Flood Monitoring Group (YCFMG), the Yarriambiack Creek Advisory Committee (YCAC) and the weir Committees of Management (CoM) at Warracknabeal, Brim and Beulah in the monitoring and management of flooding along Yarriambiack Creek.

Council also recognises the key role of the Bureau of Meteorology and VICSES in the issue and dissemination of timely and appropriate flood warnings to potentially flood-affected communities and accepts its own role as the entity responsible for on-forwarding these warning to potentially affected persons and groups within the community.

7. The roles of the following support agencies and organisations, as detailed in the Emergency Management Manual Victoria (EMMV), are also recognised:

♦ Victoria Police (VicPol);

♦ Country Fire Authority (CFA);

♦ Department of Sustainability & Environment (DSE) and Department of Primary Industries (DPI);

♦ VicRoads;

♦ Red Cross;

♦ Telstra; and

♦ Local and Regional Power and Gas Suppliers.

P A R T 2 – T H E M U N I C I P A L I T Y


1. General

The Yarriambiack Shire Council has a population of more than 7,700 people and covers an area of 7,158 square kilometres.

The Shire stretches from the Wimmera River just north of the Grampians in the south to the centre of the Mallee in the north. The area is linked by road and rail systems that run in a general north-south direction although the Borung Highway which passes through Warracknabeal and provides an east-west link.

Warracknabeal is the main service centre within the Shire.

There are two main watercourses within the Shire: Yarriambiack Creek and Dunmunkle Creek.

The townships of Warracknabeal, Brim, Beulah and Hopetoun are all located in close proximity to Yarriambiack Creek. They are also linked by the Henty Highway, the main north-south transport route between Horsham and Mildura. Dunmunkle Creek flows through the township of Rupanyup.

The main Melbourne-Adelaide railway passes through the south-west part of the Shire with the Murtoa-Hopetoun spur line adding to the rail link.

Adjacent Municipalities are Northern Grampians Shire and Rural City of Horsham to the south, Hindmarsh Shire to the west, the Rural City of Mildura to the north and Buloke Shire to the east.

The northern part of the Shire (north of Galaquil West Road) falls within the area under the control of the Mallee CMA while the southern part falls within the Wimmera CMA’s area of responsibility.

2. Overview of River Systems in the Municipality

The two main watercourses within the Shire are Yarriambiack Creek and Dunmunkle Creek. Both creeks are effluent streams from the Wimmera River and flow from south to north and are wholly located within the Shire. There are no significant inflows from any tributaries along their lengths. A section of the Wimmera River forms part of the south western boundary of the Shire while Yarriambiack Creek forms a slightly longer part. The headwaters of the Richardson River and its floodplain are in the far south eastern corner of the Shire. A more detailed description of these watercourses and their floodplains is provided in Appendix A.

3. Overview of Flood History

Flood events within the Wimmera River have been a regular feature of the area, with significant floods occurring in 1870, 1889, 1894, 1909, 1915, 1916, 1923, 1955, 1956, 1960, 1964, 1973, 1974, 1975, 1981, 1983, 1988, 1992, 1993 and 1996. Of these, 1909 is generally regarded as the largest.

Flooding along Yarriambiack Creek and Dunmunkle Creek is directly related to flooding in the Wimmera River. There is little anecdotal or reported information indicating flooding originating from either the Yarriambiack Creek or Dunmunkle Creek catchments themselves although there is some anecdotal information relating to flash flooding and overland flooding along Yarriambiack Creek.

Significant floods were experienced in Yarriambiack Creek during October 1894, August 1909, September 1915 and 1974 with smaller floods in August 1981 and September 1983. Flooding was also recorded in 1923, 1955, 1956, 1960, 1964 and 1975.

Additional information is provide in Appendices A and C.

4. Overview of Flooding Issues

Flooding in the Yarriambiack Shire can occur as a result of:

♦ Short duration, high intensity rainfall (usually associated with thunderstorms) which cause localised flash flooding on sections of roads and property, particularly within the Shire’s townships;

♦ Ruptured water mains;

♦ Debris blocking stormwater drains; and

♦ Moderate to heavy rainfall after a prolonged period of general rainfall.

P A R T 2 – T H E M U N I C I P A L I T Y


Large floods along the Wimmera River, Yarriambiack Creek and Dunmunkle Creek generally occur as a result of the latter rainfall. The period of general rainfall “wets up” the Wimmera and adjoining catchments and also partially fills natural storages within the floodplains. These two effects combine to increase the runoff generated during the subsequent period of rainfall resulting in a large flood. Apart from August 1981 and September 1983 this rainfall scenario has not occurred since the 1920’s.

In the relatively less significant flood events, only rural areas of the Shire are subjected to inundation. As flood waters rise, the extent of rural land inundated increases and roads become progressively more flood affected. Townships may also begin to flood.

A more detailed description of flooding issues within the Shire is provided in Appendix A.

5. Availability of Flood Related Data

The Yarriambiack Planning Scheme identifies areas subject to flooding from a 1% AEP (100-year ARI) event throughout the Municipality in two ways:

♦ Floodway – those areas where significant discharge or storage of water occurs during major floods (DNRE, 1998b); and

♦ Land subject to inundation – those areas inundated by the 1% AEP flood.

Within Warracknabeal, the Planning Scheme refers to designated 1% AEP flood levels. These are the 1% AEP flood levels across land designated as subject to inundation within the Planning Scheme.

The Warracknabeal and Beulah Flood Study (Water Technology, 2007) delivered a series of detailed flood inundation maps for Warracknabeal and Beulah (see Appendix I). These maps show the expected extent and depth of inundation for events ranging from the 10% AEP (10 year ARI) event up to the 0.5% AEP (200 year ARI) event. They also identify houses and other buildings likely to be flooded above floor level by each event.

Course flood extent maps were also developed for the whole of the Yarriambiack Municipality in 2000 as part of a state-wide Flood Data Transfer Project (DNRE, 2000). Although this flood extent mapping has a low level of accuracy the maps are a useful guide to highlight areas subject to flooding where detailed flood studies and accurate mapping have not yet been undertaken. Over time the relevant CMAs intend to upgrade the accuracy of this flood mapping.

Copies of the maps delivered by the Warracknabeal and Beulah flood studies as well as by the Flood Data Transfer Project are included at Appendix I of this Flood Response Plan. The maps are also available in hard copy form and as PDF’ed digital copies at the YSC MECC.

A range of other data relating to floods can be obtained from various sources as listed below:

♦ Wimmera CMA;

♦ Bureau of Meteorology;

♦ Department of Sustainability & Environment; and

♦ Yarriambiack Shire Council.

A summary of information obtained from these bodies has been used to formulate this Flood Response Plan. For example:

♦ Key flood impact and response information has been included in the Flood Intelligence Cards at Appendix A;

♦ Properties likely to be flooded (both under and over-floor) are listed in Appendix B;

♦ A short history of flooding within the Municipality is presented in Appendix C;

♦ Flood inundation and other maps are provided at Appendix I; and

♦ Other flood response related information is included as Appendices D to H.

Town Weir

P A R T 3 – M A N A G E M E N T A R R A N G E M E N T S


1. Municipal Responsibility

The Yarriambiack Shire Council recognises and accepts its responsibilities for the management of Municipal resources and the coordination of community support to counter the effects of emergencies (including flood emergencies) during both the response to and recovery from those emergencies.

The Municipality also acknowledges responsibility for educating the community in flood awareness matters generally but particularly on the flood monitoring system that applies within the Municipality.

2. Control Authority

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, earthquakes and storms and their effects.

Part 7.1 of the Emergency Management Manual Victoria (EMMV) prepared under the Emergency Management Act 1986 (as amended) designates Control and Support agencies tasked with response for various types of emergency. It identifies VICSES as the Control Agency for flood.

Part 5 Section 3 of the Yarriambiack Shire Council MEMP identifies the Control Agency for flood at Regional / Divisional and Municipal level as VICSES.

All flood response activities within the Yarriambiack Shire Council will therefore be under the control of the Regional Manager VICSES Mid-West Region, or his delegated representative.

3. Municipal Emergency Response Coordinator (MERC)

This position is held by the Officer in Charge at Warracknabeal Police Station, or his / her Deputies (at the Hopetoun and Murtoa Police Stations).

Responsibilities of the MERC are detailed in Part 3 Section 5 of the MEMP.

4. Flood Emergency Management Team

The Municipal Flood Emergency Management Team will comprise the following:

♦ Regional Officer VICSES (Chairperson);

♦ YSC Municipal Emergency Response Coordinator (MERC);

♦ YSC Municipal Emergency Resource Officer (MERO);

♦ YSC Deputy Municipal Emergency Resource Officers (Deputy MERO’s);

♦ Floodplain Management Officer, Wimmera CMA;

♦ Floodplain Management Officer, Mallee CMA;

♦ Operations Manager, GWMWater;

♦ VICSES Controller (Warracknabeal Unit); and

♦ VicRoads (Ballarat office).

This team will be convened by the Regional Manager VICSES Mid-West Region when on the advice of the Bureau of Meteorology or other reliable source, a significant flood event will (or does) occur somewhere in the Municipality. The team will make an assessment of the situation and collectively ensure that the preparedness and response activities detailed in this Plan are undertaken.

5. Command, Control & Coordination

The Command, Control and Coordination arrangements in this Flood Response Plan will be as detailed in Part 3 Section 5 of the MEMP.

6. Municipal Emergency Coordination Centre (MECC)

The function, location, establishment and operation of the MECC will be as detailed in Part 3 Section 6 and Appendix B of the MEMP.



7. Flood Operations Centre (FOC)

This is the centre established by the Control Agency (ie. VICSES) for command and control functions in response to a flood event within the Municipality.

The FOC will, following consultation between the VICSES Incident Controller and the MERC, be established in co-location with the MECC (refer to Part 3 Section 6 of the MEMP) or at an alternative site agreed to by the MERC, VICSES and YSC.

In the event that the flood incident is of a regional dimension, consideration may also be given to locating the FOC at an alternative site agreed to by the MERC, VICSES and YSC.

Activation procedures for the FOC are detailed in Part 5 Section 8 of this Flood Response Plan.

8. Debriefing Arrangements

Debriefing arrangements under this Flood Response Plan will be as detailed in Part 3 Section 8 of the MEMP.

All agencies involved in the flood incident should be represented at the debrief which should be called by the MERO and conducted within four (4) weeks of the flood incident.

Specifically, the purpose of the debrief will be to identify vulnerable areas within the Municipality as well as any shortfalls in this Flood Response Plan and associated areas such as:

♦ Coordination;

♦ Command & control;

♦ Communications;

♦ Flood mitigation;

♦ Flood warning;

♦ Public information;

♦ Community awareness;

♦ Recording and availability of flood information (see Part 4 Section 7 of this Flood Response Plan); and

♦ Future risk management.

A record of the debrief will be taken and disseminated as appropriate.

9. Flood Information and Warnings

It is important that public awareness of flood risk is optimised from a prevention / preparedness perspective as well as at the time of a flood event and is aimed at providing the community with the necessary information to develop an understanding of flood prevention, response and recovery issues. Refer to Part 3 Section 10 of the MEMP.

Authority for the issue of prevention / preparedness information on behalf of YSC rests with the MEMPC.

The release of information with regard to response activities at the time of a flood event is the prerogative of VICSES in conjunction with the MERC.

The release of recovery information will be the responsibility of YSC in consultation with Human Services Victoria when appropriate.

Comments made on behalf of the Municipality relating to Council matters must be approved by the MERO or the CEO of the YSC with regard to response issues and by the MRM or the CEO of the YSC with regard to recovery issues.

Any flood warnings issued by the Bureau of Meteorology of relevance to Yarriambiack Shire Council will be provided directly to the Shire by the Bureau. VICSES will follow up with a telephone call if any warnings are issued out of normal working hours as per the flood warning distribution system (see Appendices F, G and H). Onward distribution to respective communities of those warnings complete with value-added information will be undertaken by the Municipality through direct liaison with the Yarriambiack Creek Flood Monitoring Group (YGFMG), the Yarriambiack Creek Advisory Committee (YCAC), weir Committees of Management (CoM), ABC Radio (Horsham), local radio and regional TV (WIN TV, ABC TV). Up to date contact details for the YGFMG, YCAC and CoM are included at Appendix D to this Plan while up to date contact details for media outlets are maintained in Part 8 of the MEMP.



The method(s) used to disseminate information to communities, particularly recovery related information, will be decided at the time. Additional information on public information and warning and the methods that may be considered are detailed in Part 3 Section 10 of the MEMP.

In a significant flood event and on the decision of the Municipal Flood Emergency Management Team, a Public and Media Information Centre will be established at the MECC (see Part 3 Section 10 of the MEMP) so as to provide a place where the public can seek current information and where coordination of the release of information through the media and other channels can be effected (see also Part 5 Sections 9 & 10 of this Flood Response Plan).

10. Response / Recovery Hand Over

The transition from the response phase to the recovery phase will be conducted in accordance with existing arrangements as detailed in Part 3 Section 11 of the MEMP.

11. Maintenance of this Flood Response Plan

This Flood Response Plan must be maintained in order to remain effective. As a minimum, this will involve the following:

♦ Formal allocation of responsibility for the maintenance of this Flood Response Plan to the YSC’s Municipal Emergency Resource Office (MERO);

♦ Formal review of this Flood Response Plan and its Appendices on initial commissioning and thereafter every three (3) years as well as within five (5) weeks of a major flood event within the Municipality, by the responsible person (see also Part 3 Section 8 and Part 4 Section 7 of this Plan) in order to determine:

a. currency – confirmation that this Plan is up to date and able to be implemented as well as confirmation that all links from other procedures and plans are correct, valid and viable;

b. applicability – with particular attention to any changed conditions within the Municipality since the last review;

c. availability and accessibility – of the Flood Response Plan as well as of all equipment, facilities and personnel necessary to implement this Flood Response Plan;

d. awareness – of all participants of their roles and responsibilities;

e. presence and continued good condition – of the Flood Response Plan as well as of all associated equipment and facilities;

f. effectiveness and appropriateness - of the standard operating and associated procedures established for flood (eg. was contact timely, to the correct person, etc); and

g. appropriateness, completeness and inclusiveness - of information and instructions contained in this Flood Response Plan.

♦ Formal sign-off on the review (see Part 4 Section 7 of this Plan) with notation of any changes made and any required follow-ups along with the name and position of the responsible person (see Amendment Certificate).

In cases where a formal flood warning system exists and the Bureau of Meteorology provides a flood forecast and warning service, the above review activities should as a matter of course include consideration and negotiated adjustment of the Service Level Agreement (see Appendix F) that underpins provision of that services in the context of the time and information required to mount an effective and timely response to floods of varying magnitude.

In accordance with the CERM process, the Yarriambiack Shire Council will undertake a periodic assessment of the risks involved in any flood event arising in the Municipality and consider treatment options relative to such an event (see Part 4 Section 3 of the MEMP).

Arrangements for the testing of this Flood Response Plan will be left to the discretion of the MEMPC.

This Flood Response Plan is a sub plan to the MEMP and as such is subject to the to the audit provisions as detailed in Section 21A of Emergency Management Act 1986 (as amended).

12. Frequency and Purpose of Flood Response Plan Sub-Committee Meetings

The Flood Response Plan Sub-Committee (see Part 1 Section 4 of this Plan) will meet at least once per year and within five (5) weeks of all major flood events within the Municipality in the Council Chambers, Warracknabeal to review and where necessary amend arrangements and information contained in this Plan.

P A R T 4 – P R E V E N T I O N / P R E P A R E D N E S S A R R A N G E M E N T S


1. General

Parts 5 and 6 of this Flood Response Plan identify the roles of the various response and support agencies and organisations that exist in the Municipality.

The location and operating arrangements for MECCs and thus for FOCs (see Part 3 Section 6 and Appendix B of the MEMP and Part 3 Sections 6 & 7 of this Flood Response Plan) have been identified with sufficient flexibility and alternatives to facilitate establishment and functionality in even extreme events.

Emergency Relief Centres for the whole Municipality along with the facilities / resources contained therein are detailed in Appendix D of the MEMP.

This Flood Response Plan and the MEMP both contain provisions for the conduct of exercises designed to ensure that the Municipality and other key entities are at a state of readiness should a flood event occur.

2. Community Awareness

Details of this Plan will be released to the community via Council’s website upon formal adoption of the Plan by Yarriambiack Shire Council.

The Yarriambiack Shire Council supports delivery of pro-active community flood education and flood awareness raising programs within the Municipality and is committed to working with VICSES as the Control Agency for flood, both in the lead up to and during flood periods, to create awareness within the community of preparedness measures that have been and should be taken. This includes working to ensure that residents:

♦ Are aware of the flood threat in their area and the level at which their property might be inundated;

♦ Have access to material about how to protect themselves and their property against flood (eg. personal flood planning);

♦ Know the location of, or how to find out the location of evacuation centres;

♦ Are aware of the importance of advising Police when they make their own decisions to evacuate; and

♦ Are aware of the general contents of this Flood Response Plan.

3. Flood Warning and Monitoring Systems

3.1 Wimmera River

A flood warning system operates for the Wimmera River. The system involves the issue of timely flood warnings by the Bureau of Meteorology to the media, VICSES, Council and other stakeholder agencies and organisations and the prompt alerting and dissemination of such warnings by VICSES to other agencies and organisations. Stakeholder agencies and organisations, including Council, are responsible for onward dissemination of the warning details.

Bureau of Meteorology flood warnings are based on rainfall and river height information but also take into account antecedent conditions (eg. the ‘wetness’ of the catchment, storage levels within dams, etc). Warnings are categorised as ‘minor’, ‘moderate’ or ‘major’ (see Appendix E for an explanation of these terms and current flood class levels) and indicate the expected severity of the flood for agreed key locations along the river. The warning will also include:

♦ Rainfall amounts for selected locations within and adjacent to the Wimmera River catchment;

♦ River heights and trends (rising, steady, falling) at key locations (eg. Eversley, Crowlands, Navarre, Glynwylln, Stawell, Glenorchy, Fyans Creek, Wimmera Highway Bridge, Wonwandah East, Walmer and Quantong Bridge);

♦ Outflows (in ML/d) from dams (eg. Lake Lonsdale, Lake Fyans, Lake Wartook and Lake Bellfield) within the catchment;

♦ Forecasts of the height and time of flood peaks at key locations (eg. Glenorchy, Walmer and Quantong Bridge);

♦ Weather forecast and the likely impact of expected rainfall on flooding; and

♦ A warning re-issue date and time.

Note 1: The term “local flooding” may be used for localised flooding resulting from intense rainfall over a small area.

Note 2: The term “significant rises” may be used in the early stages of an event when it is clear that river levels will rise but it is too early to say whether they will reach flood level.

Note 3: While there is a river gauge at the Horsham Weir, it is the gauge at Walmer that is referred to in all flood warnings for Horsham.



Additional information (eg. weather radar and satellite images as well as updated rain and river level information) can also be obtained from the Bureau’s website (www.bom.gov.au/hydro/flood/vic) or for the cost of a local call on � 1300 659 217.

3.2 Yarriambiack Creek and Dunmunkle Creek

While high flows in the Wimmera River and moderate to heavy rainfall after a prolonged period of general rainfall are indicators of likely flooding along Yarriambiack and Dunmunkle creeks, a formal flood warning system has not been implemented for either Creek.

A flood monitoring system does however exist along the length of Yarriambiack Creek. The system is managed and operated by Yarriambiack Shire Council in conjunction with the YCFMG, YCAC and weir CoM. Details of the system are provided in Appendix D.

4. Land Use Planning

The Yarriambiack Shire Council is mindful of the need to continually monitor applications for development of any kind within areas likely to be subject to inundation by flood.

Restrictions / conditions on future land development due to the potential for flood inundation are contained in the Yarriambiack Shire Council Planning Scheme and associated Schedules. The Planning Scheme and its Schedules identify land that is subject to inundation as well as land designated as floodway along with the development restrictions and conditions that apply within precincts of the Municipality. These are supported by declared 1% AEP flood levels (ie. the best current estimate of the height of the 1% AEP flood at a location - it has a 1% chance of being equalled or exceeded in any one year) within the Warracknabeal urban area (RWC Plan No 147008B)1.

The Warracknabeal and Beulah flood study was completed in 2007 and provides valuable input to the Yarriambiack Planning Scheme and associated Schedules as well as this Flood Response Plan.

Regional responsibility for floodplain management for the southern part of the Shire (ie. south of Galaquil West Road) is vested in the Wimmera CMA and in the Mallee CMA for the northern part.

5. Flood Mitigation Schemes

There are no approved flood mitigation schemes within the Municipality.

6. Flood Protection

6.1 Residents

The Yarriambiack Shire Council encourages residents (in both urban and rural areas) and business owners in potentially flood prone areas to plan and put in place effective flood protection measures for their dwellings and business premises.

Advice on appropriate flood protection measures can be obtained from the Yarriambiack Shire Council. The Wimmera CMA and / or Mallee CMA may also be able to offer advice on sources of additional information.

Building works within the LSIO and FO will require planning approval from the Yarriambiack Shire Council and will be subject to the provisions of the Yarriambiack Planning Scheme and associated Schedules.

6.2 Planning Permits and Construction of New Levees

Planning permits are required for all earthworks including flood protection works within flood prone areas.

The construction of new levees or the modification of existing levees in urban areas, other than those constructed under a Flood Mitigation Scheme approved by the Minister or those constructed consistent with the provisions of the Yarriambiack Planning Scheme, will not be authorised by way of a Permit issued by the Yarriambiack Shire Council. Such levees will therefore be deemed to be illegal and those persons responsible for their construction will expose themselves to the potential for litigation brought by those subsequently affected by inundation as a direct result.

1 The flood levels declared for Warracknabeal on 8th June 1988 are likely to be superseded by 1% flood levels determined through

the Warracknabeal and Beulah flood study (Water Technology, 2007). When new 1% flood levels are declared at Warracknabeal and Beulah, this Plan should be updated and relevant Wimmera CMA and/or Mallee CMA Plan Nos included.



6.3 Rural Dwellings

In order to reduce the risk of flooding, property owners in rural areas may be able to construct an earthen bund (or levee) around their dwelling and immediate curtilage to provide flood protection up to at least the 1% AEP flood level. If properly planned, such bunds can be drained although provision would need to be made for control of the drains in the event of a flood.

Under existing Yarriambiack Planning Scheme controls, construction of an earthen bund would be defined as “works” and may therefore require a planning permit. See also Section 6.7 below.

6.4 Farm Land

Flooding of farm land is a natural occurrence. Levees by definition interrupt the natural flow of water.

6.5 Liability

Any person or organisation performing maintenance, strengthening, raising, lengthening, relocation or related works on any levee other than those approved under a flood mitigation scheme could be legally liable should any person upstream, downstream or adjacent consider that the works undertaken diverted water from its natural course or pre-existing flow path and onto their assets. Similarly, increased water levels might also be considered to cause or increase flooding and associated damage. Those responsible for carrying out any such works could be liable for the costs of damage to crops, assets and ultimately loss of life.

6.6 Maintenance of Approved Levees

There are no approved levees within the Municipality.

6.7 Maintenance of Private Levees

Levees by definition interrupt the natural flow of water.

Where approved levees have been constructed to a design or designated flood level, maintenance of existing approved levees throughout the rural areas of the Municipality will continue to prevent rural land from being flooded up to their design level. The maintenance of such levees is a private matter for the landholders concerned. However, any person or organisation increasing the height, length or location of any private levee will leave themselves open to the actions identified in Section 6.5 above as well as liable to action for failing to comply with Municipal planning regulations.

6.8 Sandbags

The Yarriambiack Shire Council will keep on hand a minimum of 100 sandbags with a stock level of 500 for its own requirements in order to protect public assets (ie. those assets that are the statutory responsibility of Council). The Warracknabeal VICSES unit maintains a minimum of 500 sandbags on hand with a stock level of 1000. Further stock may be available from other VICSES units.

If additional sandbags are required during a flood event, Council will source them from VICSES Regional Headquarters and / or from neighbouring Municipalities.

Sandbags and sand, but only if applied for, will be made available free of charge but only on the basis of protecting dwellings and their immediate vicinity. Applications for sandbags and sand are to be made to VICSES or Council’s MERO.

Additional sandbags and sand required by residents other than approved as above may be supplied to residents or property owners at the discretion of VICSES or Council’s MERO.

Information on Council’s sandbag policy will be released to the community through the media when the Flood Emergency Management Team considers it appropriate.

7. Recording of Flood Information

During a flood it is important that key aspects of the event are recorded so that this Flood Response Plan and its associated actions can be improved and future flood damage better contained. Procedures detailed in Appendix D are aimed at assisting that process. See also Part 3 Section 8 of this Flood Response Plan.

The Wimmera CMA and Mallee CMA, through their respective Flood Response Action Plans, undertake a limited amount of flood information recording during and immediately after major flood events. It is important that there is no



duplication of or overlap with these activities.

River gauges managed by DSE also continually record river level information along the Wimmera River and its tributaries. Similarly, rain gauges operated by the Bureau and other agencies record rainfall depths.

Arrangements for the collection / recording of all other flood related information is the responsibility of the Municipality in conjunction with the YCFMG and YCAC although the Wimmera CMA and / or Mallee CMA will assist where possible. The MERO should ensure there is no duplication of data collection activities and efforts.

Data to be collected includes:

♦ The date / time and height on the reference river gauge (see list of gauges in Appendix D) when key infrastructure (eg. drains, roads, buildings, etc) is first affected by rising flood waters;

♦ The extent and depth of the peak of the flood within Warracknabeal, Brim, Beulah, Hopetoun and Rupanyup as well as at strategic locations within the rural areas of the Shire (in conjunction with Wimmera CMA and / or Mallee CMA);

♦ As part of and in preparation for the above, actively encourage residents to mark the flood peak with a permanent marker on a permanent structure within their property and to note the date / time of its occurrence;

♦ Flood damage – in both qualitative and quantitative terms (refer to YSC’s Building Surveyor, Department of Human Services and Wimmera CMA and / or Mallee CMA as well as to Part 7 Section 5 of the MEMP);

♦ Information on flood monitoring system performance (see Appendix D) and the progressive implementation of the actions outlined in this Plan;

♦ Where relevant, information on flood warning system performance particularly in relation to the Service Level Agreement (see Appendix F) and the progressive implementation of the actions outlined in this Plan; and

♦ A summary of the development, progression and impact of the flood event (see Appendix A) (in conjunction with Wimmera CMA and / or Mallee CMA).

The flood intelligence cards at Appendix A, the list of properties likely to be flooded (with corresponding river level and indication of over floor flood depth) at Appendix B and the history of flooding at Appendix C, as well as any other Sections of this Flood Response Plan, should be updated within five (5) weeks of a flood peak with information collected as part of the above and as may be collected as a consequence of the event debrief (see Part 3 Sections 8 & 11) as well as from the collective experience of the Flood Emergency Management Team.

Following consideration of proposed updates and additions at a meeting of the Flood Response Plan Sub-Committee (ideally within six (6) weeks of a flood peak – see Part 3 Section 11 of this Plan), copies of the updated Appendices and Sections should be forwarded to the Wimmera CMA and / or Mallee CMA with a request that any additional available information be added to them to further assist the Yarriambiack Shire Council in its response to future floods.

Following receipt of advice from the Wimmera CMA and / or Mallee CMA and incorporation of any additional information, the MERO in consultation with the Flood Response Plan Sub-Committee, should initiate a formal update cycle for this Flood Response Plan.

P A R T 5 – R E S P O N S E A R R A N G E M E N T S


1. Introduction

1.1 Activation of Response

This Plan may be activated by the Yarriambiack Shire Council, the Regional Manager VICSES Mid-West Region or the MERC after consultation with the Control Agency (VICSES).

The Regional Manager VICSES Mid-West Region or his delegated representative as Flood Incident Controller will activate agencies as required.

1.2 Municipal Involvement

If the flood incident requires significant Municipal involvement, the MERC will liaise with the MERO as required and the MERO will in turn consult with the CEO as to the level of involvement to be undertaken.

1.3 Escalation

The State Emergency Response Plan provides the mechanism for the build-up of appropriate resources to cope with emergencies throughout the State. It also provides for requests for physical assistance from the Commonwealth when State resources have been exhausted.

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.

1.4 Stand Down

Stand down will be declared by the VICSES Regional Manager or his delegate after consulting with the Yarriambiack Shire Council and when it is considered that the response phase of the incident has been terminated. This will allow the recovery processes, which in most circumstances will have already commenced, to assume priority.

2. Flood Triggers

Flood intelligence cards are provided at Appendix A. These cards provide a guide for those responding to a flood situation within the Yarriambiack Shire Council. They contain agreed flood trigger levels and information on flood impacts within the Municipality relative to key locations and provide a basis for managing flood response.

The Regional Manager VICSES Mid-West Region or his delegate, in conjunction with the Flood Emergency Management Team, will ensure that the actions listed are undertaken.

3. Flood Monitoring and Warning Systems

3.1 General

The flood warning service provided by the Bureau of Meteorology for the Wimmera River catchment is described in Part 4 Section 3.1 of this Plan and the Service Level Agreement that underpins delivery of that service is provided at Appendix F.

The flood monitoring system that operates for Yarriambiack Creek is described in Part 4 Section 3.2 of this Plan.

3.2 Flood Watch

Flood Watch is a service provided by the Bureau of Meteorology to notify the Victorian community of the potential flood threat from a developing weather situation with due regard for current catchment conditions. Flood Watches are issued for specific regions (eg. the Wimmera) and make short generalised statements about the developing weather situation including forecast rainfall totals, describe the current state of the catchments within the target area and indicate the streams at risk from flooding. Instructions for obtaining rain and stream level observations and access to updated Watches and Warnings are also included.

Normally, the Bureau would issue a Flood Watch 24 to 36 hours in advance of any likely flooding and issue updates as required. If at any time during this period there is an imminent threat of floods occurring, the Flood Watch would be upgraded to a Flood Warning.



3.3 Flood Warnings

Flood Warnings are firm predictions of flooding. Bureau issued Flood Warnings are based on actual rainfall measurements and streamflow based models of catchment behaviour that take account of likely future rainfall.

3.4 Dissemination

Flood Watches and Warnings are issued by the Bureau to the media, VICSES and a range of other stakeholder organisations including the Yarriambiack Shire Council. If the Watch or Warning is issued out of normal business hours, the Duty Officer VICSES Mid-West Region will call the Yarriambiack Shire Council to alert the YSC MERO or Deputy MERO (see the MEMPC contact list at the front of the MEMP) of the situation and the Bureau’s action. This flow of information is shown in diagram form at Appendix G.

Organisations receiving notification of a Flood Warning either directly from the Bureau or via VICSES will monitor the situation and take appropriate action within their areas of responsibility, ensuring that at all times, VICSES as the Control Agency for flood, is kept appraised of developments and that any actions taken accord with the overall strategy adopted by VICSES to respond to the event and as reflected in this Flood Response Plan.

4. When Flooding is Considered Likely

When it is apparent that flooding within the Shire is likely (expected when moderate to heavy rainfall is forecast or occurs after a prolonged period of general rainfall that has “wetted up” the Wimmera and adjoining catchments and partially filled natural storages within the floodplains), YSC personnel including the MERO and Deputy MERO will be deployed and will arrange for:

♦ In consultation with the Chair of the YCAC, the commencement of monitoring of water levels / flows within Yarriambiack Creek (see Appendix D);

♦ As necessary2, changes to weir gate openings and board removal at the Warracknabeal, Brim and Beulah weirs;

♦ The erection of road closure signs on low level and similar crossings in the vicinity of the Wimmera River, Yarriambiack Creek and / or Dunmunkle Creek as necessary; and

♦ A check of the Warracknabeal stormwater system pump (located at Anzac Park) and outlets.

In addition, whenever flooding within the Shire is considered likely, personnel should refer to Appendix A to determine likely flood impacts and required response actions. Appendices B, C and I also contain information that will assist in determining likely impacts and necessary responses. It is suggested that current and forecast weather conditions (see www.bom.gov.au/hydro/flood/vic or call on �� 1300 659 217) should also be considered in determining the extent of likely impacts and necessary responses.

5. Weirs along Yarriambiack Creek

Weir pools are maintained along Yarriambiack Creek at Jung, Warracknabeal, Brim, Beulah and Lake Lascelles at Hopetoun. Each weir pool is managed separately by different Committees of Management (CoM).

The Warracknabeal, Brim and Beulah weirs have been identified by WBM (2003) as strategic as they have the ability to readily modify the free flow of water down the Creek, particularly during moderate flows and small floods thereby limiting the extent and volume of flows downstream. During a flood, the weirs are generally operated by the individual CoM under instruction from Yarriambiack Shire Council’s representative to the YSFMG to maximise flow conveyance but with the aim of retaining sufficient water during the flood recession to end the event with a weir pool at full supply level (see Appendix D).

Undershot regulators have been installed at all weir pools with the exception of Jung where a fish ladder has been installed. Undershot regulators allow the release of a known volume of water and are relatively easily controlled during moderate to high flows. However, they do need to be monitored during floods to ensure that that do not become blocked by debris. The task of keeping them clear of debris is performed by the individual CoM.

2 The general philosophy for operation of Yarriambiack Creek weirs in the lead up to and during flood is described in Appendix D.



6. Dam Break

GWMWater as operators of storages within the Wimmera River catchment (ie. Lake Lonsdale, Lake Fyans, Lake Wartook, Lake Bellfield, Taylors Lake and Pine Lake) will issue warnings in relation to dam failure or similar emergencies as required.

Special procedures to be followed by Yarriambiack Shire Council in the event of a dam failure have not been detailed as impacts within the Shire are expected to be minimal. Normal flood related procedures as detailed in this Plan are considered to be sufficient.

7. Water Quality Issues

Inundation of septic tanks (eg. Beulah) and sewerage pump stations (there are four at Warracknabeal: Werrigar Street near the corner of Jamouneau Street, Craig Avenue between Tobruk Avenue and Kokoda Avenue, Kelsall Street between Molyneaux Street and Duncan Street, Ross Street between Kurrajong Street and Clifford Street) may result in water quality problems within the municipality.

It is the responsibility of GWMWater3 to:

♦ Advise YSC of the security of pump stations and similar assets in the event of flood;

♦ Maintain or improve the security of pump stations and similar assets;

♦ Check and correct the operation of pump stations and similar assets in times of flood; and

♦ Advise the FOC in the event of inundation of pump stations and similar assets.

It is the responsibility of YSC’s Environmental Health Officer to inspect and report to the MERO and the Flood Response Plan Sub-Committee (see Part 1 Section 4 of this Plan) on any issues relating to flooding and water quality.

8. Flood Operation Centre (FOC)

Based on receipt of advice from upstream through GWMWater, Wimmera CMA, the Bureau of Meteorology, the YCAC or the YCFMG of the potential for a flood incident to occur or from another reliable source of the actual or likely occurrence of flooding, VICSES, the MERC or the MERO may, if considered necessary, call a meeting of the Flood Emergency Management Team (see Part 3 Section 4 of this Plan) to decide on any action to be taken.

The decision as to if and when the FOC should be activated (in effect it is likely that the MECC will be established as part of normal operations and will become the FOC) rests with the Control Agency (ie. VICSES).

Up until the FOC is established, the Yarriambiack Shire Council shall carry out its normal functions of observation and placement of warning signs as well as recommendation on and closure of roads and bridges as is necessary throughout the Municipality while VICSES will respond as required to calls for assistance. YSC staff will 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 (see Appendix A). The Shire, as a key member of the YSFMG shall also carry out its functions in relation to flood monitoring and instructing weir CoM on weir settings (see Appendix D).

Member organisations of the Flood Emergency Management Team will provide a Liaison Officer to the FOC if and as required as well as other staff and / or resources identified as being necessary.

As stated in Part 3 Section 7 of this Plan, the FOC is the centre established for the command and control functions in response to a flood event within the Municipality. It is the centre from which flood response activities are managed by the Control Agency (ie. VICSES).

In the event that the decision is made to establish the FOC in co-location with the MECC, the Yarriambiack Shire Council will provide administrative resources for the FOC including staff and physical resources in accordance with MECC Standard Operating Procedures detailed in Appendix B of the MEMP.

During flood operations, it is expected that VICSES will be self-sufficient with its communications at local and regional levels.

3 All GWMWater pump stations telemeter alarms to GWMWater’s control room if water levels in pump sumps rise past a critical

level or are inundated.



Appropriate communications systems will be installed by relevant agencies at the FOC on a needs basis in consultation with the VICSES Regional Manager or his delegate.

In the event that agencies other than VICSES install communications in the FOC, representatives from the respective organisations will be relied on to staff those facilities.

9. Public Information

When convened, the Flood Emergency Management Team (see Part 3 Section 4 of this Plan) will also consider the need for the establishment of a Media and Public Information Centre (see Part 3 Section 9 of this Plan).

In most circumstances, the Media and Public Information Centre will be located in the MECC (see Part 3 Section 10 of the MEMP).

If established, the Yarriambiack Shire Council will staff and manage the Centre, prepare public information material (all such material must be approved by both the MERO or CEO and the Incident Controller representing VICSES prior to issue) and attend to public enquiries.

As Control Agency, VICSES will retain overall responsibility for all media matters relevant to any flood event but will liaise closely with both the Yarriambiack Shire Council and Victoria Police on relevant issues.

In addition to providing information to the public, the Media and Public Information Centre will record and pass on any advice or information received from the public that may warrant attention or amount to useful intelligence to the FOC. Such advice or information will be recorded within the FOC and actioned as necessary.

To avoid telephone congestion and confusion, the public will be advised during a flood event via the media to direct their queries / calls to the Public Information Centre.

The telephone and facsimile numbers for the Public Information Centre will be determined during a flood event and will be advised through the local media.

To further assist in this regard, a recorded message service will be considered by the YSC as a means of providing regularly updated flood information direct to the community. Ideally this information would include:

♦ Current rain and river level readings;

♦ Information on and / or predictions of river levels, flows or flood behaviour;

♦ Weather forecasts;

♦ Likely flood impacts;

♦ Recommended flood damage reducing actions;

♦ Details of road closures; and

♦ Contact and other information likely to be of value to the community.

10. Flood Bulletins

VICSES will prepare and disseminate Flood Bulletins to the media and other appropriate channels whenever the Flood Emergency Management Team adopts the view that Bulletins are warranted. These Bulletins will contain details from the most recent Bureau-issued flood warning as appropriate as well as relevant local information and trends together with forecasts of likely flood impacts and advice on appropriate flood damage reducing actions.

11. Door Knocking

Where appropriate and if required, available VICSES personnel, Municipal staff and / or other community groups will be tasked to contact / door knock residents who are in areas expected to be badly flooded (ie. above floor level).

12. Evacuation

The Flood Emergency Management Team will determine the need to evacuate any residents in flood threatened areas. Victoria Police and VICSES, assisted by other agencies as required, will implement an Evacuation Plan (refer to Part 7 Section 3 and Appendix C of the MEMP).

P A R T 6 – S U P P O R T A R R A N G E M E N T S


1. General

There are a number of agencies with specific roles that will act in support of VICSES and also provide support to the community in the event of a serious flood within the Yarriambiack Shire Council area (as they will in any other emergency situation). Detailed support arrangements applicable to this Flood Response Plan are contained in Part 7 of the YSC MEMP.

P A R T 7 – R E C O V E R Y A R R A N G E M E N T S


1. General

Arrangements for Recovery from a flood incident within Yarriambiack Shire will be as detailed in Part 6 of the MEMP.

The MRM will ensure that flood affected persons are well represented on any Recovery Committee established as a consequence of a flood event within the Municipality. The purpose of this representation is to ensure that community needs and resource requirements are identified, appropriate recommendations made and relevant follow-up actions implemented.

A P P E N D I X A - F L O O D I N T E L L I G E N C E


1. General

In using the information contained in the following Flood Intelligence Cards, consideration needs to be given to the time of travel of the flood peak. A flood on a ‘dry’ watercourse will generally travel more slowly than a flood on a ‘wet’ watercourse (eg. the first flood after a dry period will travel more slowly than the second flood in a series of floods). Hence, recent flood history, soil moisture and forecast weather conditions all need to be considered when using the following information to direct flood response activities.

Large floods along the Wimmera River, Yarriambiack Creek and Dunmunkle Creek generally occur as a result of moderate to heavy rainfall after a prolonged period of general rainfall. The period of general rainfall “wets up” the Wimmera and adjoining catchments and also partially fills natural storages within the floodplains. These two effects combine to increase the runoff generated during the subsequent period of rainfall resulting in a large flood. Apart from August 1981 and September 1983 this rainfall scenario has not occurred since the 1920’s.

Short duration, high intensity rainfall (usually associated with thunderstorms) can also cause localised (flash) flooding on sections of roads and property within the Municipality and particularly in the townships when the local drainage systems surcharge. Such events, which are mainly confined to the summer months, do not create main stream flooding since they only last for a short time and affect limited areas. Flooding from these storms occurs with little warning.

A history of notable flood events within the Wimmera River catchment is provided in Appendix C of this Plan.

2. Flood Inundation Mapping

The Warracknabeal and Beulah Flood Study (Water Technology, 2007) delivered a series of detailed flood inundation maps for Warracknabeal and Beulah (see Appendix I). These maps show the expected extent and depth of inundation for events ranging from the 10% AEP (10 year ARI) event up to the 0.5% AEP (200 year ARI) event as well as the extent of flooding at Warracknabeal from stormwater arising from the 100 year ARI rainfall event. The maps also identify houses and other buildings likely to be flooded above floor level by each event. Surveyed floor levels have been compared to predicted flood heights. A red dot is used to show each floor level lower than the expected flood height (ie. over floor flooding is likely). A list of affected properties with corresponding river levels and likely flood depths is provided at Appendix B.

Course flood extent maps were also developed for the whole of the Yarriambiack Municipality in 2000 as part of a state-wide Flood Data Transfer Project (DNRE, 2000). Although this flood extent mapping has a low level of accuracy the maps are a useful guide to highlight areas subject to flooding where detailed flood studies and accurate mapping have not yet been undertaken.

Copies of the maps delivered by the Warracknabeal and Beulah flood studies as well as by the Flood Data Transfer Project are included at Appendix I of this Flood Response Plan. The maps are also available in hard copy form and as PDF’ed digital copies at the YSC MECC.

For other areas of the Municipality not covered by detailed flood maps, the Yarriambiack Planning Scheme shows areas likely to be inundated by a 1% AEP (100-year ARI) flood event as the LSIO (Land Subject to Inundation Overlay). While it is not practical to reproduce the overlay as an attachment to this Flood Response Plan, hard copies are available from YSC and Wimmera CMA. They are also available in hard copy form and as PDF’ed digital copies at the YSC MECC and in digital form at the DSE website www.doi.vic.gov.au/planningschemes.

Within Warracknabeal, the Planning Scheme refers to designated 1% AEP flood levels. These are the 1% AEP flood levels across land designated as subject to inundation within the Planning Scheme.

3. Digital Datasets and Aerial Flood Photography

The Victorian Flood Data (VFD) datasets (available from the Wimmera CMA and / or Mallee CMA) also contain a significant quantity of flood information in GIS format. For example:

♦ Historic flood levels at Warracknabeal for the 1909 to1981 flood events;

♦ Historic flood extents taken from aerial photography of the February 1973 and August 1981 events;

♦ 1% AEP (100 year ARI) flood extent and levels within Warracknabeal and Beulah;

♦ Extents for a range of flood events (10 year ARI to 200 year ARI) at Warracknabeal and Beulah; and

♦ Approximate 1% AEP (100 year ARI) flood extents along the length of the Creek.



The original aerial flood photography mentioned above along with other flood related records is also available from the Wimmera CMA (see Table below).

Information Area Events

Historical Flood Levels Warracknabeal August 1909 and August 1981

Video footage Yarriambiack Creek 1974 flood

Yarriambiack Creek 10 October 1973 (vertical photography)

North of Warracknabeal August 1981

From Horsham-Minyip Road to Warracknabeal

7 & 10 August 1981 (vertical photography) Aerial flood photography

Near Wimmera River/Yarriambiack Creek confluence

9 – 10 September 1983 (video & oblique photography) 3 September 1988 (oblique photography) 2 & 4 October 1996 (oblique photography)

Interpreted flood extent Near Wimmera River/Yarriambiack Creek confluence

Outer envelope of known floods from 1909 – 1985 based on flood photography and information from local residents

Historical photographs Warracknabeal Floods in 1894, 1909, 1923, 1930 & 1981

4. Overview of Flooding Issues

4.1 The River System

The two main watercourses within the Shire are Yarriambiack Creek and Dunmunkle Creek. Both creeks are effluent streams from the Wimmera River and flow from south to north and are wholly located within the Shire. There are no significant inflows from any tributaries along their lengths. A section of the Wimmera River forms part of the south western boundary of the Shire while Yarriambiack Creek forms a slightly longer part. The headwaters of the Richardson River and its floodplain are in the far south eastern corner of the Shire.

Yarriambiack Creek is a distributary of the Wimmera River. It leaves the Wimmera River near Longerenong through an uncontrolled off-take structure and includes Darlot Swamp, which is fed by Two-Mile Creek another effluent watercourse of the Wimmera River. It flows north a distance of some 135km via Jung, Warracknabeal, Brim and Beulah to terminate in a series of normally dry lakes: Lake Corrong, south east of Hopetoun and Lake Lascelles to the east of Hopetoun. During very large flow events the Creek has flowed to a series of terminal wetlands further north of Hopetoun.

The off-take structure at the Wimmera River / Yarriambiack Creek confluence is uncontrolled and during normal low flow periods allows approximately one third (1/3) of the Wimmera River flow to enter Yarriambiack Creek. During periods of higher / flood flow the structure is by-passed and somewhere between 5% and 15% of the Wimmera River flow makes its way into Yarriambiack Creek (Fluvial Systems, 2006).

During large floods, water breaks out of the Wimmera River at a number of locations including at Faux’s Bridge, approximately 6km upstream of the off-take. This water flows down Station Creek, through Barrabool Reserve into Corkers Creek and joins Yarriambiack Creek immediately south of Darlot Swamp. Yarriambiack Creek also carries flow that spills directly from the Wimmera River. The combined flow then splits at Darlot Swamp; some flow continues down Yarriambiack Creek while the remainder flows back to the Wimmera River via Darlot Swamp and Two Mile Creek.

The Creek only flows intermittently during non flood periods.

In the upper reaches near the Wimmera River, the Creek is perched as it traverses the flat alluvial Wimmera River floodplain. North of Darlot Swamp which is in the Rural City of Horsham to just south of Warracknabeal the Creek flows in a broad shallow valley (approximately 1.5km wide at the Wimmera Highway). North of Warracknabeal, the Creek channel is narrow and meanders on its own alluvial floodplain.

Numerous levees, channel banks, roadway embankments, culverts and regulating structures are present along or across the Creek and floodplain. The latter were installed initially for irrigation, stock and domestic purposes but are now used predominantly to provide communities along the Creek with water, recreational facilities and to regulate flows. Weir pools are maintained at Jung, Warracknabeal, Brim, Beulah and Lake Lascelles at Hopetoun. The Warracknabeal, Brim and Beulah weirs have been identified by WBM (2003) as strategic as they have the ability to readily modify the free flow



of water down the Creek, particularly during moderate flows and small floods thereby limiting the extent and volume of flows downstream.

Dunmunkle Creek is also a distributary of the Wimmera River. It leaves the Wimmera River upstream of the Glenorchy township and flows, intermittently, in a northerly direction through the eastern part of the Shire, becoming part of the channel system that eventually reaches Lake Tyrell north of Sea Lake. The Creek is reasonably well defined between the Wimmera River and Rupanyup but downstream, past the Minyip–Banyena Road, it becomes progressively less defined.

A small part of the Wimmera floodplain which is wide with many effluent flow paths, is located in the south western corner of the Shire while the headwaters of the Richardson River and its floodplain are in the far south eastern corner

In the relatively less significant flood events, only rural areas of the Shire are subjected to inundation. As flood waters rise however, the extent of rural land inundated increases and roads become progressively more flood affected. Townships may also begin to flood.

4.2 The Flood Threat

4.2.1 Yarriambiack Creek

The Wimmera River environs downstream of Glenorchy to Horsham, including the upper reaches of Yarriambiack Creek, start to experience localised flooding soon after the river reaches minor flood level (a gauge height of 4.00m) at Glenorchy.

Large areas of flat rural land flood and access to properties is affected for extended periods during large flood events as floodwaters spread wide due to the low topography along the Creek. A number of roads are also affected where they cross the Creek. The only towns along the Creek considered to be at risk of flooding are parts of Warracknabeal, Beulah and Hopetoun. At Warracknabeal, floods around the 5% AEP (20 year ARI) event begin to encroach on developed areas while at Beulah this occurs during floods that are a little lower than the 2% AEP (50 year ARI) event (see maps at Appendix I). While there is no firm data for Hopetoun, local residents have indicated that significant parts of the town have flooded in the past, including the sewerage treatment works, tennis courts and an area west of Lake Lascelles.

Floods travel very slowly along Yarriambiack Creek. For example, it has been stated (WBM, 2003) that a flood can take a week to travel from Warracknabeal to Beulah, a direct line distance of 36km.

The fall along the length of Yarriambiack Creek is quite low and the capacity of the Creek channel is small. Further, there is significant vegetation within and adjacent to the Creek channel and there are 66 structures (SMEC, 2001) along its length. These factors combine to cause inundation of the surrounding floodplain at quite low flows and contribute to the slow travel time.

There have been changes to the Yarriambiack Creek weir structures (see Part 5 Section 5 of this Plan) since the last flood. They have not therefore been tested by a flood and their affect on downstream flows is not fully known. Nevertheless, it is considered that the weirs will have minimal impact on flows as they are generally operated to maximise flow conveyance.

If culverts upstream from Warracknabeal are (or become) blocked during an event, flood waters are likely to inundate large areas of the town.

Only relatively small amounts of local runoff contribute to the quantity of water in Yarriambiack Creek, even though at Warracknabeal, stormwater collected at Anzac Park (a local low point) is pumped into the Creek. The management of stormwater along Yarriambiack Creek is described in the Wimmera Region Stormwater Management Plan (Parsons Brinckerhoff, 2002).

4.2.2 Dunmunkle Creek

Flows begin in the upper reaches of Dunmunkle Creek when the Wimmera River at Glenorchy approaches a gauge height of around 4.65m (0.10m below moderate flood level at Glenorchy).

From east of Lubeck to the Minyip-Banyena Road, the Creek flows in a reasonably well defined channel with no significant obstructions. Generally, flood flows do not spread over a wide area apart from into the adjoining swamps and waterholes. Downstream of the Minyip-Banyena Road however, the watercourse changes. A combination of poor drainage, channel works and mainstream flooding results in the inundation of quite large areas.



During large flood events, significant areas of flat rural land are flooded by Dunmunkle Creek and access to properties along the Creek may be affected for extended periods. A number of roads may also be affected where they cross the Creek. Extremely large floods are likely to cause flooding within Rupanyup, the only town along the length of the Creek.

Floods travel very slowly along Dunmunkle Creek due to the flat grade and riparian vegetation.

Stormwater contributions to flows in Dunmunkle Creek are even less than for Yarriambiack Creek as it flows predominantly through a rural area: the only town it passes through is Rupanyup.

4.2.3 Wimmera River

There are no towns within the Shire at risk of flooding from the Wimmera River. However, flat rural land in the south west corner of the Shire is flooded and access to properties is affected for extended periods during large flood events. A number of roads are also affected.

4.2.4 Richardson River

Flooding along that part of the Richardson River within the Shire is not considered sufficient to warrant consideration within this Plan.

4.3 Channel Capacities

Yarriambiack Creek channel has a low capacity resulting in inundation of the surrounding floodplain at quite low flows. Vegetation and structures along its length (66 structures, some of which have associated road approach structures that form significant obstructions, have been identified by SMEC, 2001) contribute to the low conveyance capacity.

Once out of the Creek channel, flood waters spread wide due to the low topography along the Creek

4.4 Historic Floods

Information on historic floods within the Shire is listed in Appendix C.

5. Rainfall and Flooding

5.1 General Guidance

The following rainfalls and antecedent conditions are considered likely to lead to possible flooding but are provided as an indicative guide only.

♦ After a long dry spell such as occurs in summer – 50mm over the Wimmera catchment in less than 4 days;

♦ After an initial break but while still dry – 25mm over the Wimmera catchment in less than 2 days; and

♦ Under very wet conditions or very closely following a previous big flow event – 5mm in 12 hours.

5.2 At Warracknabeal

The effects of heavy rainfall at Warracknabeal are shown in the rainfall based flood extent map in Appendix I. Most of the town’s streets experience nuisance flooding although flows tend to drain into Anzac Park (as expected). Considerable ponding occurs along Tarrant Street adjacent to the Warracknabeal Railway Station and will affect properties in the area bounded by Tarrant, Woolcock and Molyneaux streets. Further ponding occurs in the residential area bounded by Woolcock, Thomas, Franklin and Molyneaux streets. To the west of Yarriambiack Creek, overland runoff from the area adjacent to the Hospital collects to an overland flow path (depression) that runs from near the corner of Watson and Gould streets and continues in a north easterly direction across Tobruk Avenue and along Coral Avenue to the Creek downstream from Heron Island on the west side of town.

Analysis in Water Technology (2007) reveal that limited runoff enters the township along the Henty Highway from the Whitton Swamp catchment. The major part of runoff from the Whitton Swamp catchment flows overland on the eastern side of the Henty Highway towards the racecourse.

5.3 At Beulah

Following heavy local rainfall, some minor stormwater ponding is likely to occur in the area bounded by Bell, Phillips, Gladstone and Dingwell streets. A small overland flow path runs from Bell Street to the north to the stormwater drainage dam located adjacent to Lascelles Street. Further but limited ponding also occurs in the area bounded by Tavernor, Phillips, Lalor and Deakin streets.



6. Impact of the Wimmera Mallee Pipeline

Piping of the Wimmera Stock and Domestic System (ie. the Wimmera Mallee Pipeline Project) has the potential to impact on flood behaviour in three ways:

♦ Alteration to the operating regime of the existing storages within the Wimmera catchment;

♦ Alterations to floodplain conveyance characteristics; and

♦ Alterations to floodplain storage characteristics.

Over time there will be some alterations to channel embankments within the Shire and the potential for a redistribution of flows associated with very large floods as well as a change in storage characteristics. The impact and consequences of such redistribution and change in storage characteristics will need to be observed and recorded in future flood events.

7. Flood Intelligence Cards

7.1 Introduction

All flood intelligence records are approximations. This is because no two floods at a location, even if they peak at the same height, will have identical impacts.

The flood intelligence record identifies levels that constitute flooding for the various sectors of the community (eg urban, rural, residential and business) and for different locations within the reference area for the river gauge. In doing so, the record marries the physical and social information and community analysis gathered during hazards and during actual flood events and provides a framework for managing problems that will occur as the river rises. Thus barricades to close roads can be assembled, school bus and transport companies advised thereby allowing decisions on alternative routes to be taken, and pre-event identification and prioritisation of evacuation requirements can be made for houses and other premises ahead of when they are most needed to be done.

Most importantly, recording heights against consequences and actions helps develop a modus operandi for flood managers that involves routinely looking ahead to ensure responses occur at appropriate times. In turn, this means that actions which need to be undertaken are carried out when they can be done rather than when they are most needed to be done.

7.2 Update of Flood Intelligence Cards

A critical input to the flood planning process is flood intelligence (ie. a summary of the impact of floods of differing severity).

To remain valid, flood intelligence needs to be updated to include any new information that becomes available from studies and / or from actual floods as (or immediately after) they happen. Both quantitative (flood levels, results from flood, floodplain management, dam, bridge, culvert, drainage and road design studies, insurance company claims records, etc) and qualitative data (anecdotal evidence on previous flood impacts from members of the community, local newspapers, journals, municipal records and reports) should be documented and accumulated.

There is no right or wrong way to document such information provided that it is accessible and in a form that is easily understood and assimilated by those who need to use it.

The following Flood Intelligence Cards should be updated within five (5) weeks of a flood peak with information collected as part of post-flood information recording activities and as may be collected as a consequence of the event debrief (see Part 3 Section 8) as well as from the collective experience of the Flood Emergency Management Team. Procedures detailed in Part 4 Section 7 of this Flood Response Plan should be followed to ensure a comprehensive and coordinated approach to update.



7.3 Gauge Location: Wimmera River at Glenorchy

The following table is included in this Flood Response Plan as it gives an indication of likely flood impacts in the southern and south western extremities of the Shire.

The Bureau of Meteorology anticipate being able to provide a minimum of 24 hours warning lead time of flooding at Glenorchy in most situations. An absolute minimum of 8 to 10 hours is anticipated in the unlikely event of failure of most rain gauges in the upper parts of the catchment.

W IMM ER A R I V E R a t G L E N O R CH Y

River Height (m)

River Flow (ML/d)

Consequence / Impact within Yarriambiack Shire Action4 Comments

No information other than more damaging than the 200 year ARI event. Probable Maximum Flood (PMF)

5.05m 36,600ML/d 0.5% AEP (200 year ARI) event

5.03m 33,350ML/d Many Shire roads and low level bridges flooded – see list at Appendix I.

Driving in a normal car likely to be dangerous.

Ensure all low level bridges and river crossings are closed.

1% AEP (100 year ARI) event

5.03m 33,350ML/d Consider need to evacuate or resupply rural properties.


5.01m 29,730ML/d 2% AEP(50 year ARI) event

4.97m 25,200ML/d September 1988 event 4.3% AEP (23 year ARI)

4.96m 24,320ML/d 5% AEP (20 year ARI) event

4.94m 22,800ML/d Advise rural property owners that they may be isolated for some days.

October 1973 event 6.4% AEP (16 year ARI)

4.91m 20,100ML/d October 1975 event 9.4% AEP (11 year ARI)

4.90m 19,720ML/d 10% AEP (10 year ARI)

4.90m 19,300ML/d Flooding up to 0.25m deep along upper reaches of Dunmunkle Creek.

Erect “Water Over Road” and “Road Closed” signs as appropriate.

Advise that driving in water more than 300mm deep is highly dangerous and may result in loss of life.

Major Flood Level 10% AEP (10 year ARI)

4.86m 17,700ML/d September 1983 event

4 All references to unsafe driving depths have been extracted from Appendix J of Floodplain Management in Australia, Best Practice Principles and Guidelines (ARMCANZ, 2000)



W IMM ER A R I V E R a t G L E N O R CH Y

River Height (m)

River Flow (ML/d)

Consequence / Impact within Yarriambiack Shire Action4 Comments

13% AEP (7.7 year ARI)

4.85m 17,200ML/d August 1981 event 14% AEP (7 year ARI)

4.79m 15,000ML/d October 1992 event 19% AEP (5.3 year ARI)

4.78m 14,800ML/d October 1996 event 19.5% AEP (5.1 year ARI)

4.77m 14,600ML/d 20% AEP (5 year ARI) event

4.75m 14,200ML/d Moderate Flood Level 21% AEP (4.7 year ARI)

4.72m 13,500ML/d August 1980 event 23% AEP (4.4 year ARI)

4.65m Flows likely in the upper reaches of Dunmunkle Creek Advise landholders so that stock can be moved from low lying areas.

4.50m 10,075ML/d Likely that some rural land will be inundated and some roads become progressively more flood affected.

Erect “Water Over Road” signs as appropriate.

Advise property owners in rural areas of the likelihood of some road and property flooding.


4.00m 7,000ML/d Localised minor flooding of rural land adjacent to the Wimmera River.

Flows likely in upper reaches of Yarriambiack Creek if river continues to rise.

Advise landholders so that stock can be moved from low lying areas.

Minor Flood Level 50% AEP (2 year ARI)

The flows, gauge heights, AEPs and ARIs quoted in the above table have been extracted from the analysis documented in Water Technology (2003 & 2006).



7.4 Gauge Location: Upstream of the Outlet from the Warracknabeal Weir Pool

Y A R R I AM B I A C K C R E E K a t W A R R A C K NA B E A L

While bigger floods will tend to rise and travel faster than smaller floods, flow velocities outside the main Creek channel will generally be very low. If culverts upstream from Warracknabeal are or become blocked during an event, flood waters are likely to inundate large areas of the town.

Information in this table is based on the assumption that the town weir is open.

It is assumed that the Committee of Management will keep weirs free of debris Surface Elevation (m AHD)

Depth of Water at Gauge (m)

Creek Flow (ML/d) Consequence / Impact within the Municipality Action5

Comments


108.72m 2.92m 3,776ML/d Many properties flooded over floor. Consider need to evacuate or resupply rural properties.

0.5% AEP (200 year ARI) event

108.70m 2.90m 3,577ML/d

A total of 84 houses are flooded over floor with below floor flooding of a further 149 properties (see Appendix B).

Breakouts occur on either side of the Creek through town. Many town roads on the western side of the Creek and in the north eastern part are flooded including the Borung Highway and Warracknabeal-Jeparit Road.

Flow across Cemetery Road and at end of Wood Street is up to 0.5m deep.

Water extends half way across the rear oval at the Secondary College.

Water up to 0.5m deep extends up McIntyre Street and into No 3.

Apex Park is flooded along with parts of St Mary’s School.

Water up to 0.25m deep flows over the Borung Highway to the west of the Creek crossing and down Craig Avenue to Noall Street.

Water up to 250mm deep through the Caravan Park and up to 500mm deep at the entrance from Lyle Street.

Flow across Fong Tong Avenue and Warunda Avenue more than 0.5m deep becomes a little shallower and extends across the end of Woolcock Street and down The Avenue to the intersection with Anderson Street causing over floor flooding of 9 houses and below floor flooding of a further 25 properties. Anderson Street is flooded along with 19 adjoining properties, 2 over floor.

Water up to 250mm deep through the Bowls Club at the end of Woolcock Street.

Door knock, sandbag or evacuate houses identified as subject to over floor flooding (see list at Appendix B and flood inundation maps at Appendix I).

Close the Borung Highway if not already done.

Consider closing the Henty Highway

Erect road signage as appropriate.

If it is raining heavily in Warracknabeal while the Creek is in flood, expect flood impacts across town to be more severe and look at earlier warning of house flooding and road closures (see flood inundation maps at Appendix I).











Comments

Water mainly around 0.25m deep in Gould Street and up Cox Street to Noall Street with 8 properties flooded.

Much of the built up area and all roads from just south of the Woodbine Training Centre to the Warracknabeal-Jeparit Road is flooded to a depth of up to 0.5m with some areas deeper than 0.5m.

Most of the block bounded by Devereux Street, Phillips Street, the railway line and Kelsall Street including the GWMWater depot is flooded to a depth of around 0.25m.

The GWMWater sewerage pump station on Kelsall Street between Molyneaux Street and Duncan Street is flooded.

Most of the built up area and roads downstream of Kelsall Street including the Christian Community College and the Warracknabeal-Jeparit Road north of the Asquith Avenue is flooded to a depth of up to 0.5m.

Water lapping edge of the Henty Highway at northern end of town.

108.68m 2.88m N/A Consider closing the Borung Highway.

108.66m 2.86m 2,704ML/d

Breakout across Cemetery Road more extensive and encroaching on rear oval at Secondary College mostly around 0.25m deep. Flow returns to the Creek near the end of Wood Street.

Water up to 0.25m deep extends up McIntyre Street and lapping the edge of the Borung Highway to the west of the Creek crossing.

Apex Park and most of the Caravan Park are flooded.

Flow across Fong Tong Avenue and Warunda Avenue up to 0.5m deep becomes shallower as it extends across the end of Woolcock Street and down The Avenue to the intersection with Anderson Street causing over floor flooding of 6 houses and below floor flooding of a further 27 properties in this area.

Most of the Woodbine Training Centre and surrounding streets down to the Warracknabeal-Jeparit Road are flooded to between 0.25m and 0.5m depth. A total of 33 houses suffer over floor flooding (see Appendix B).

The GWMWater sewerage pump station on Craig Avenue between Tobruk Avenue


Evacuate the Caravan Park if not done yet.

Close the Warracknabeal-Jeparit Road if not already done.

Erect further “Water Over Road” and “Road Closed” signs as appropriate.


If it is raining heavily in Warracknabeal while the Creek is in flood, expect flood impacts










Comments

and Kokoda Avenue flooded.

The GWMWater sewerage pump station on Ross Street between Kurrajong Street and Clifford Street is flooded.

Water lapping the Warracknabeal-Jeparit Road downstream from the Asquith Avenue intersection with shallow flows over the road from Ross Street.

Water up to 0.25m deep flowing over the Warracknabeal-Jeparit Road west of the Creek crossing.

across town to be more severe and look at earlier warning of house flooding and road closures (see flood inundation maps at Appendix I).

108.55m 2.75m N/A

Advise residents of likely flooding (see Appendix B).

Consider evacuating the Caravan Park.

Advise rural property owners that they may be isolated for some days.

Deploy further “Water Over Road” and “Road Closed” signs as appropriate.

Consider closing the Warracknabeal-Jeparit Road.

108.47m 2.67m 1,788ML/d

Breakout across Cemetery Road and up to southern boundary of Secondary College up to 0.25m deep. Flow returns to Creek near end of Wood Street.

Edges of the Caravan Park begin to flood – deep, fast flowing water.

Flows across Fong Tong Avenue, Warunda Avenue and The Avenue around 0.25m deep with some flooding of adjacent properties.

Shallow breakout near the Creek end of Kokoda Avenue flows into Kokoda Avenue and Craig Avenue, causing over floor flooding of 4 houses and below floor flooding of a further 63 properties (mostly in Craig, Kokoda and Warunda Avenues). Flow returns to the Creek across the lower end of the Flora and Fauna Reserve.

Creek end of Asquith Avenue flooded up to 0.5m deep.

Craig Avenue and 30 adjoining properties flooded up to 0.25m deep.

Advise residents of likely flooding (see Appendix B).

Consider relocating vans in the Caravan Park.

Deploy “Water Over Road” and “Road Closed” signs as appropriate.

See flood inundation maps at Appendix I.










Comments

Water lapping edge of Warracknabeal-Jeparit Road west of Creek crossing.

More extensive but shallow breakouts downstream.

N/A N/A Consider deploying “Water Over Road” and “Road Closed” signs as appropriate.

108.22m 2.41m 1,261ML/d

Water up to 0.25m deep over Cemetery Road near the Creek.

Flood flows contained within the Creek corridor through Warracknabeal. Shallow breakouts across paddocks to the east downstream of town

Check the stormwater pump located at Anzac Park (Scott & Gardiner streets) and all outlets.

See flood inundation maps at Appendix I.


N/A 1,149ML/d Little damage likely. 20% AEP (5 year ARI) event

N/A N/A Erect “Road Closed” signs on low level and similar crossings.

Remind CoM to keep weir and gate free of debris.

N/A N/A YSC representative to instruct CoM on weir operation in order to minimise flood impacts (see Appendix D).

N/A N/A YSC representative decides in conjunction with Chair of the YCAC that Creek monitoring should commence.

YSC to activate all YCFMG readers – ensure readers established for all gauges and know what to do (see Appendix D).

The flows, gauge heights, surface elevations, AEPs and ARIs quoted in the above table have been extracted from the analysis documented in Water Technology (2007).

Flood impacts described in the above table relate primarily to mainstream flooding from Yarriambiack Creek. Local impacts, or impacts in excess of those indicated, may occur as a result of local stormwater runoff and drainage. Similarly, local increases in flood levels and impacts may result from local factors such as culvert and other blockages and from obstructions to overland flows such as earthworks, fences, building, cars and the like.



7.5 Gauge Location: Upstream side of the Birchip-Rainbow Road culverts at Beulah

Y A R R I AM B I A C K C R E E K a t B E U L A H

While bigger floods will tend to rise and travel faster than smaller floods, flow velocities outside the main Creek channel will generally be very low. Information in this table is based on the assumption that the town weir is open.




Comments


86.02m 1.21m 2,756ML/d May inundate the water supply storages / ponds.

Consider need to evacuate or resupply rural properties.

Consider need to evacuate the Caravan Park.

0.5% AEP (200 year ARI) event

86.00m 1.20m 2,575ML/d

Water up to 0.75m deep across the Henty Highway near the southern boundary of town and near the Phillips Street intersection.

Flood waters beginning to encroach on land around the Primary School

Water at least 0.5m deep across the Birchip–Rainbow Road east of town.

Water up to 1.0m deep extends along the western / Creek side of the oval.

The area bounded by the Creek, Lalor Street, Deakin Street, Gladstone Street and Bell Street flooded to a depth mainly around 0.25m with below flooding of x properties in x and 0.5m.

Breakout flow from the weir pool is flooding the northern section of Lalor Street and parts of Gladstone Street and adjacent properties. This flow combines with flows breaking out from below the weir pool to affect 47 properties in the area bounded by the Creek, Gladstone Street, Phillips Street and Bell Street. This includes the CFA station and Health Centre / Hospital.

Shallow flow paths are evident through land either side of Phillips Street from Bell Street to the depression on the northern side of Lascelles Street. Flow over Bell Street may be as deep as 0.25m.

Depressions to the east of the railway line and those north of the water supply storages and Lascelles Street becoming progressively more inundated.

The water supply storages are surrounded by flood waters but not inundated.



Advise rural property owners that they may be isolated for some days.

Consider need to relocate Health Centre, CFA and Police facilities if not already done.










Comments

85.95m 1.15m 1,892ML/d

Water at least 0.5m deep across the Henty Highway near the southern boundary of town and near the Phillips Street intersection.

Water up to 0.5m across the Birchip–Rainbow Road a little east of town.

Breakout flow from the weir pool is flooding the northern section of Lalor Street and parts of Gladstone Street and adjacent properties. This flow combines with flows breaking out from below the weir pool to affect 32 properties in the area bounded by the Creek, Gladstone Street, Phillips Street and Bell Street. This includes the CFA station.

A shallow flow path is evident through vacant land between Dingwell and Phillips Street from Bell Street to the stormwater pond on the southern side of Lascelles Street. Flow over Bell Street is quite shallow.


Advise residents of likely flooding (see Appendix B and maps at Appendix I).

Close the Birchip-Rainbow Road if not already done.

Deploy “Water Over Road” and “Road Closed” signs as appropriate.

Consider need to relocate CFA facilities.


85.93m 1.13m N/A Breakout developing from the weir pool near Lalor Street.

Breakout developing downstream of the weir pool near Gladstone Street. Refer to Appendix B and Appendix I.

85.91m 1.12m N/A Consider closing the Birchip-Rainbow Road.

85.90m 1.11m 1,184ML/d

Significant breakaway with water up to 0.5m deep across the Henty Highway and under the Hopetoun Railway line near the southern boundary of town and up to 0.25m deep just south of the Phillips Street intersection.

Water up to 0.25m across the Birchip–Rainbow Road a little east of town.


Inundation of farm land to the east of the Henty Highway.

Close the Henty Highway if not already done.

Erect “Water Over Road” signs on the Birchip-Rainbow Road.



85.88m 1.09m N/A Consider closing the Henty Highway.

85.87m 1.08m N/A Break out developing from south of town to the east likely to affect the Henty Highway.

Erect “Water Over Road” signs on the Henty Highway.

85.86m 1.07m 873ML/d Flood flows contained within the Creek corridor through Beulah township although Check all stormwater outlets. 10% AEP (10 year








Comments

flow does pond into the depression downstream of the GWMWater water supply storages and to the east of the Creek downstream of Lascelles Street.

See flood inundation maps at Appendix I. ARI) event

N/A 795ML/d Little damage likely. 20% AEP (5 year ARI) event

N/A N/A Erect “Road Closed” signs on low level and similar crossings.

Remind CoM to keep weir and gate free of debris.

N/A N/A YSC representative to instruct CoM on weir operation in order to minimise flood impacts (see Appendix D).

N/A N/A YSC representative decides in conjunction with Chair of the YCAC that Creek monitoring should commence.

YSC to activate all YCFMG readers – ensure readers established for all gauges and know what to do (see Appendix D).

The flows, gauge heights, surface elevations, AEPs and ARIs quoted in the above table have been extracted from the analysis documented in Water Technology (2007).

Flood impacts described in the above table relate primarily to mainstream flooding from Yarriambiack Creek. Local impacts, or impacts in excess of those indicated, may occur as a result of local stormwater runoff and drainage. Similarly, local increases in flood levels and impacts may result from local factors such as culvert and other blockages and from obstructions to overland flows such as earthworks, fences, building, cars and the like.



8. Typical Flood Peak Travel Times

Location From Location To Typical Travel Time Comments

Start of rainfall (upper catchment) Glenorchy 24 to 30 hours

Glenorchy Horsham 2 to 3 days

Glenorchy Wimmera Highway Bridge 1.5 to 2 days

Wimmera River Off-take Wimmera Highway Bridge 27 hours 45 minutes 1983 flood - quoted in Fluvial Systems (2006)

Wimmera Highway Bridge Warracknabeal 4 days 14.5 hours Water Technology (2007)

Warracknabeal Beulah 7 days Anecdotal evidence quoted in WBM (2003)

A P P E N D I X B – P R O P E R T I E S L I K E L Y T O B E F L O O D E D


Introduction

The following is a list of properties expected to experience flooding (and the depth of that flooding) at various heights at the respective weir pool gauge along with an indication of the likely depth of over floor flooding. It is strongly recommended that the following list be used in conjunction with the flood inundation maps (see Appendix I) where a red dot has been used to show each floor level lower than the expected flood height (ie. where over floor flooding is likely).

Information in the following tables (and maps at Appendix I) is based on the assumption that the town weirs are open. If town weirs have not been opened, flooding will probably be deeper and more extensive (ie. more properties flooded) than indicated.

Update of List of Properties Likely to be Flooded

The list of properties likely to be flooded (with corresponding river level and indication of over floor flood depth) should be updated within five (5) weeks of a flood peak with information collected as part of post-flood information recording activities and as may be collected as a consequence of the event debrief (see Part 3 Section 8) as well as from the collective experience of the Flood Emergency Management Team. Procedures detailed in Part 4 Section 7 of this Flood Response Plan should be followed to ensure a comprehensive and coordinated approach to update.

WARRA C K N A B E A L

Depth of flooding at property for selected flows/heights on the weir flood gauge.

Depth of over floor flooding at property for selected flows/ heights on the weir flood gauge.

Location of House (Street Name & Number)

2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

3 Alamein Avenue 0.13m 0.27m






12 Alamein Avenue 0.23m


1 Anderson Street 0.17m


3 Anderson Street 0.12m 0.27m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments


















1 Asquith Avenue 0.15m 0.42m 0.61m 0.73m 0.02m

2A Asquith Avenue 0.25m 0.37m

5 Asquith Avenue 0.04m 0.23m 0.35m

7 Asquith Avenue 0.20m 0.32m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments



13 Asquith Avenue 0.22m

15 Asquith Avenue 0.15m

1 Asquith Reserve 0.17m

2 Asquith Reserve 0.22m 0.38m



8 Asquith Reserve 0.18m 0.34m 0.14m







28 Asquith Reserve 0.16m

1 Bowman Street 0.08m 0.23m



2 Bowman Street 0.40m








2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

3A Bowman Street 0.22m












1 Burma Avenue 0.17m 0.37m 0.16m

3 Burma Avenue 0.24m 0.40m

3 Cemetery Road 0.07m 0.16m

3A Cemetery Road 0.07m 0.17m

5 Cemetery Road 0.26m



1 Clifford Street 0.13m 0.43m 0.23m

3 Clifford Street 0.41m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments














1 Coral Avenue 0.13m

2 Coral Avenue 0.35m 0.53m 0.03m

4 Coral Avenue 0.52m 0.16m





10 Coral Avenue 0.36m 0.52m 0.30m 0.46m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments





2 Craig Avenue 0.15m



8 Craig Avenue 0.17m 0.29m 0.05m







44 Craig Avenue 0.33m 0.13m




52 Craig Avenue 0.09m 0.24m 0.01m 0.17m









2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments










68 Craig Avenue 0.18m 0.37m 0.51m 0.05m 0.19m











90 Craig Avenue 0.19m 0.37 0.50m 0.07m 0.19m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

90A Craig Avenue 0.19m 0.37m 0.50m 0.09m








106 Craig Avenue 0.44m 0.63m 0.75m 0.44m 0.63m 0.75m












132 Craig Avenue 0.23m 0.42m 0.54m 0.01m 0.20m 0.31m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

3 Devereux Street 0.50m 0.13m

5 Devereux Street 0.38m 0.14m

13 Devereux Street 0.35m








5 Dimboola Road 0.20m 0.36m

9 Dimboola Road 0.10m

11 Dimboola Road 0.21m

16 Dumbouy Road 0.14m 0.28m 0.37m

1 Elizabeth Avenue 0.07m

2 Elizabeth Avenue 0.17m 0.64m 0.01m

3 Elizabeth Avenue 0.06m 0.31m




2 Fong Tong Avenue 0.08m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

3 Fong Tong Avenue 0.03m 0.25m 0.41m

4 Fong Tong Avenue 0.23m

7 Gould Street 0.06m








213 Henty Highway 0.39m

2 Jamouneau Street 0.06m




10A Jamouneau Street 0.14m



1 Jeparit Road 0.20m

1A Jeparit Road 0.27m








2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments



8 Jeparit Road 0.23m 0.34m




33 Jeparit Road 1.07m 1.17m 0.69m 0.79m


35 Jeparit Road 0.77m 0.95m 0.12m

41 Jeparit Road 1.30m 1.36m 1.79m 1.85m 0.37m 0.43m

49 Jeparit Road 1.97m 2.03m 2.05m 2.17m 0.08m

130 Jeparit Road 0.37m 1.16m 1.18m

2 Kelsall Street 0.23m





8 Kelsall Street 0.31m 0.02m

8A Kelsall Street 0.32m 0.01m









2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments






26 Kelsall Street 0.36m 0.11m

28-30 Kelsall Street 0.41m




1 Kokoda Avenue 0.25m 0.43m 0.57m 0.04m 0.25m 0.39m

1 Kokoda Avenue 0.20m 0.34m



2 Kokoda Avenue 0.05m 0.24m 0.38m

3 Kokoda Avenue 0.24m 0.43m 0.57m 0.01m




7 Kokoda Avenue 0.19m 0.38m 0.51m 0.01m 0.14m








2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

9 Kokoda Avenue 0.17m 0.36m 0.49m 0.02m








Cnr Kurrajong St & Ross St 0.50m 0.64m

2 Lyle Street 0.45m 0.67m 0.89m

7 Lyle Street 0.14m 0.32m

4A Lyle Street 0.11m

8A Lyle Street 0.16m 0.32m




3 McIntyre Street 0.35m 0.51m

1 Menin Avenue 0.21m 0.41m 0.54m 0.07m 0.20m

3 Menin Avenue 0.17m 0.37m 0.05m 0.07m 0.20m

4 Menin Avenue 0.17m 0.30m

5 Menin Avenue 0.27m 0.0.40m 0.12m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

6 Menin Avenue 0.16m 0.30m

7 Menin Avenue 0.10m 0.30m 0.43m 0.02m 0.21m 0.35m

9 Menin Avenue 3.28m 3.48m 3.69m 0.18m

2 Molyneaux Street 0.41m

4 to 6 Molyneaux Street 0.19m








1 Phillips Street 0.12m




2 to 6 Scott Street 0.03m

2 Symes Avenue 0.25m 0.44m 0.57m

1 The Avenue 0.22m 0.40m









2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

7 The Avenue 0.19m 0.35m 0.03m

9 The Avenue 0.31m 0.47m 0.09m


13 The Avenue 0.21m 0.37m 0.16m 0.32m


17 The Avenue 0.07m 0.28m 0.45m 0.01m 0.18m


1 Tobruk Avenue 0.64m 0.82m 0.64m 0.82m

2 Tobruk Avenue 0.14m 0.33m

3 Tobruk Avenue 0.11m

4 Tobruk Avenue 0.29m 0.49m 0.12m

6 Tobruk Avenue 0.20m 0.40m

8 Tobruk Avenue 0.33m 0.53m 0.06m 0.26m

12 Tobruk Avenue 0.23m

1 Tregear Street 0.36m 0.51m 0.59m

1 Warunda Avenue 0.39m 0.62m 0.78m 0.12m 0.28m

1 Warunda Avenue 0.03m 0.25m 0.41m


5 Warunda Avenue 0.15m 0.32m









2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

9 Warunda Avenue 0.60m 0.82m 0.99m 0.01m



17 Warunda Avenue 0.28m 0.44m 0.26m 0.42m

1 Watson Street 0.09m














4 Wood Street 0.21m 0.37m 0.46m 0.05m 0.14m

6 Wood Street 0.06m 0.19m

Woodbine Street 0.16m 0.40m







2.41m 2.67m 2.86m 2.90m 2.92m 2.67m 2.86m 2.90m

Comments

1 Woolcock Street 0.26m 0.49m 0.65m 0.06m

2 Woolcock Street 0.13m 0.28m

3 Woolcock Street 0.14m 0.36m 0.52m



6 Woolcock Street 0.28m









B E U L A H

Depth of flooding at property for selected levels on the Rainbow Road (Beulah) gauge.

Depth of over floor flooding at property for selected levels on the Rainbow Road gauge.


1.07m 1.11m 1.15m 1.20m 1.21m 1.15m 1.20m 1.21m

Comments

11 Bell Street 0.15m

13 Bell Street 0.66m 0.79m 0.94m 1.03m


19 Bell Street 0.39m 0.47m







67 Bell Street 0.19m 0.34m 0.42m

72 Bell Street 0.38m 0.46m 0.20m 0.28m

Bell Street - Hospital 0.04m Hospital

Bell Street – CFA building 0.32m 0.40m CFA building

36 Deakin Street 0.14m



46 Deakin Street 0.12m 0.20m



Deakin Street (Footy Shed) 0.12m 0.27m 0.35m Footy Shed



B E U L A H




1.07m 1.11m 1.15m 1.20m 1.21m 1.15m 1.20m 1.21m

Comments

4 Dingwell Street 0.20m 0.26m

Dingwell Street - Church 0.22m 0.27m Church

17 Gladstone Street - Hall 0.23m 0.31m Hall

21 Gladstone Street 0.35m 0.44m






30 Gladstone Street 0.10m


33 Gladstone Street 0.13m

14 Henty Highway 0.24m 0.38m 0.53m 0.61m

92 Henty Highway 0.11m

Henty Highway (School) 0.14m 0.28m 0.43m 0.51m School

Cnr Henty Hwy & Murdoch St 0.13m

19 MacKenzie Street 0.29m

70 Phillips Street 0.06m 0.14m Memorial Hall

71 Phillips Street 0.12m Senior Citizens Home

72 Phillips Street 0.40m 0.48m




B E U L A H




1.07m 1.11m 1.15m 1.20m 1.21m 1.15m 1.20m 1.21m

Comments





Phillips Street (Bowls Club) 0.24m 0.40m 0.48m Bowls Club



B R I M

Location of House Approx River Level at which Property Flooding will Occur Approx River Level at which Over Floor Flooding will Occur

HO P E TO U N


R U P A N Y U P


A P P E N D I X C – F L O O D H I S T O R Y


General

Flood events within the Wimmera River have been a regular feature of the area, with significant floods occurring in 1870, 1889, 1894, 1909, 1915, 1916, 1923, 1955, 1956, 1960, 1964, 1973, 1974, 1975, 1981, 1983, 1988, 1992, 1993 and 1996. Of these, 1909 is generally regarded as the largest.

Flooding along Yarriambiack Creek and Dunmunkle Creek is directly related to flooding in the Wimmera River. There is little anecdotal or reported information indicating flooding originating from either the Yarriambiack Creek or Dunmunkle Creek catchments themselves, although there is some anecdotal information relating to flash flooding and overland flooding along Yarriambiack Creek.

Significant floods were experienced in Yarriambiack Creek during October 1894, August 1909, September 1915 and July 1974 with smaller floods in August 1981 and September 1983. Flooding was also recorded in 1923, 1955, 1956, 1960, 1964 and 1975.

Flooding was experienced along Dunmunkle Creek in July 1974.

A number of large floods occurred along the Wimmera River prior to 1924 including events in 1889, 1894, 1909 and 1915. This is in contrast to the subsequent period (1924 to 2005) where only a few large floods have occurred. Generally the community attribute the absence of large floods since 1923 to development within the catchment (eg. land use change, construction of water storages, etc). However, recent studies (SRWSC, 1982; Water Technology, 2003) have concluded that development has had minimal impact on the magnitude of large floods within the catchment while conceding that total runoff (yield) from the catchment may have reduced.

A history of notable flood events within the Wimmera River catchment, derived from analysis contained in Water Technology (2007) and supplemented with information extracted from Fluvial Systems (2006), is provided in the Table below.

Gauging Station Location and Number Month/Year of Flood Glenorchy

415201

Walmer *

415200 Comments

Aug. 1909 No records 3.86m gauge 42,400 ML/day 0.5% AEP

Widespread flooding along the Wimmera River and Dunmunkle and Yarriambiack Creeks. Townships of Horsham, Glenorchy, Warracknabeal, Dimboola, Jeparit and Rupanyup affected. Estimated peak flow at the Railway Bridge on Yarriambiack Creek (1.5km downstream of the Wimmera Highway) = 13,000ML/d d (150m3/s).

Sept 1915 No records 3.69m gauge 29,100 ML/day 2.7% AEP

Major flood along Wimmera River and Yarriambiack Creek. Townships of Horsham, Glenorchy, Warracknabeal, Dimboola & Jeparit affected.

July 1974 Flooding along Dunmunkle Creek

Aug 1981 4.85m gauge 17,200 ML/day

14% AEP

3.63m gauge 24,800 ML/day 4.7% AEP

Significant flooding along Wimmera River & Yarriambiack Creek. Horsham, Warracknabeal, Dimboola & Jeparit may have been affected to some degree.

Flow at Wimmera Highway Bridge = 1,715ML/d. Flow at Beulah Weir = 1,180ML/d (13.6m3/s).

Sept 1983 4.86m gauge 17,700 ML/day

13% AEP

3.77m gauge 35,000 ML/day 1.3% AEP

Flow at Wimmera Highway Bridge = 1,712ML/d. Flow at Warracknabeal Weir = 1,114ML/d (12.9m3/s). Flow at Goyura West Road culvert = 850ML/d.

NOTES: The Walmer gauge is located about 3.7km downstream of the Horsham Weir.

AEPs of historic events are approximate only.

A P P E N D I X C – F L O O D H I S T O R Y


Update of Flood History

The above history of flooding should be updated within five (5) weeks of a flood peak with information collected as part of post-flood information recording activities and as may be collected as a consequence of the event debrief (see Part 3 Section 8) as well as from the collective experience of the Flood Emergency Management Team. Procedures detailed in Part 4 Section 7 of this Flood Response Plan should be followed to ensure a comprehensive and coordinated approach to update

1894 flood

On 12 October 1894, the Warracknabeal Herald reported widespread flooding, but the event had a very quick recession. The newspaper also reported that older residents recalled the great flood of 1870 as the largest flood in living memory.

August 1909 Flood

Anecdotal evidence points to the August 1909 flood as being the largest major flood in the Wimmera catchment for which detailed records exist. About 82 mm of rain fell over the catchment during the 19 hours ending 6pm 19 August 1909, causing widespread flooding.

At Elmhurst, in the upper reaches of the catchment, the flood was estimated to be at least 0.6 m higher than the 1870 flood. At Glenorchy, all but six houses were flooded.

Further downstream at Horsham a peak flow of 43,900ML/d was recorded. The flood was estimated to be similar in volume to the previous highest floods of 1870 and 1852.

Information about the 1909 event along the Yarriambiack Creek is limited. Reports from the Horsham Times indicated widespread flooding at Warracknabeal: ‘all the residents of Woolcock, Devereux, Molyneaux and Lyle Streets have been flooded out. In fact there are few places outside Scott Street and part of the south-east of the town not under water….the depth of water in some parts of the main street is 3 feet, and it is expected the flood will rise a good deal yet. The whole countryside between Murtoa to Hopetoun is practically underwater’.

On 27 August, the Warracknabeal Herald reported that the Yarriambiack Creek rose so suddenly in the early hours of 25 August, that residents on the western side of town (Warracknabeal) had to evacuate, with water inundating houses to a depth of 1m to 1.3m. Boats were being rowed in the town’s streets.

At Beulah, local residents believe the flood was marginally lower than an earlier (1889) flood. Hastily built levees saved the township from flooding. Further north at Hopetoun, the Warracknabeal Herald reported on 27 August that ‘No damage will result in this township’.

Along Dunmunkle Creek, the August 1909 event was also a major flood. At Rupanyup on 21 August, the floodwater was said to have been 1.4m deep over the whole township and flowing in a stream 5.3km wide.

July 1974

An article in the Warracknabeal herald dated 1 August 1981 indicated that in 1974, floodwaters spilled from Lake Corrong into the normally dry lakes to the north.

There was flooding reported along Dunmunkle Creek on 12 July 1974.

August 1981 Flood

There were no reports of flooding from Rupanyup on Dunmunkle Creek during the 1981 event.

A P P E N D I X D – G U I D E L I N E S F O R F L O O D M O N I T O R I N G

A N D W E I R O P E R A T I O N


General Statement of Operational Responsibilities

When it is apparent that flooding within the Shire is likely (expected when moderate to heavy rainfall is forecast or occurs after a prolonged period of general rainfall that has “wetted up” the Wimmera and adjoining catchments and partially filled natural storages within the floodplains), YSC personnel including the MERO and Deputy MERO will be deployed and will arrange for:

♦ In consultation with the Chair of the YCAC, the commencement of monitoring of water levels / flows within Yarriambiack Creek;

♦ As necessary, changes to weir gate openings and board removal at the Warracknabeal, Brim and Beulah weirs; and

♦ Weirs to be kept free of debris by CoM members, as required.

The Shire, as a key member of the YSFMG shall carry out its functions in relation to flood monitoring and instructing weir CoM on weir settings (see below).

General Philosophy for Weir Operation along Yarriambiack Creek in the Lead up to and During Flood

In order to reduce damage downstream and within communities surrounding weir pools, the general philosophy for weir operation along Yarriambiack Creek in the lead up to and during time of flood is to:

♦ Release water from weir pools ahead of increased inflows; and

♦ Progressively close weirs as inflows reduce following passage of the flood peak.

Due to the current lack of objective guidance on flows within Yarriambiack Creek and fail-safe weir operations, application of the above philosophy may from time to time result in a reduced weir pool within some or all communities along the Creek. It is considered more important (from both an environmental and financial / legal point of view) to minimise flood related damages than to maintain weir pool levels. When flooding is expected and during flood events, weirs will therefore be operated with a view to reducing flood related damage rather than to maintaining pool levels.

Monitoring Flood Flows along Yarriambiack Creek

Flood flow monitoring along Yarriambiack Creek will occur during moderate or high flow events.

The decision to commence and cease monitoring will be made by a Yarriambiack Shire Council (YSC) representative in conjunction with the Chairperson of the Yarriambiack Creek Advisory Committee (YCAC). The YSC representative will be the Shire MERO (see below) or as otherwise nominated by Council.

Generally, when monitoring has commenced, one reading per day will be required at 7.00am or as soon as practicable thereafter.

During high flood flows, two readings per day may be requested. The second reading should be made at 6.00pm or as near as practicable.

All data should be provided to the Shire’s representative by either fax, email or phone (see below for contact details).

The data will be used by Council’s representative to assist in making decisions with respect to opening of weir gates, removal of weir board/s and the placement of road closed or similar signage.

Council’s representative has the authority to instruct the Committees of Management (CoM) at Warracknabeal, Brim and Beulah on weir operation.

Committees of Management (CoM) are expected to record the times of openings and closures along with the settings at each weir whenever there is a change during a flood event and to provide that information to Council’s representative.

Yarriambiack Shire Council’s representative is currently:

MERO: James Magee

Phone: 0429 954 042 or 5398 0102

email: [email protected]

Fax: 5398 2502

A P P E N D I X D – G U I D E L I N E S F O R F L O O D M O N I T O R I N G A N D W E I R O P E R A T I O N


Yarriambiack Creek Flood Monitoring Group - Contact Details

Name Group Address Phone Facsimile Mobile Email

James Magee Yarriambiack Shire

PO Box 243 Warracknabeal (w) 46 Austin Street Hopetoun (h)

5398 0102 (w) 5083 3512 (h)

5398 2502 0429 954 042 [email protected]

David McKenzie Redda’s Park Committee Management 76 Lyle Street Warracknabeal

5390 4212 (w) 5394 1849 (h)

0427 909 205

Doug Hallam Yarriambiack Creek Advisory Committee 41 Evelyn Street Hopetoun

5083 3180 5083 3180

Kevin Munro Beulah Weir Pool Committee RMB 245 Beulah

5390 2213 5390 2205 0429 902 213 [email protected]

Gus Shannon Beulah Weir Pool Committee 13 Phillips Street Beulah

5390 2375 5390 2485 0427 902 375

Max Golder Redda’s Park Committee Management RMB 640 Brim

5390 0206 5390 0244 0487 900 206

James McFarlane Yarriambiack Creek Advisory Committee 357 Brim East Road Brim

5390 4251 5390 4364 0427 535 147 [email protected]

Maurice Williams Beulah Creek Management Committee 84 Phillips Street Beulah

5390 2363 5390 2327

5390 2496

George Armstrong Yarriambiack Creek Advisory Committee PO Box 38 Murtoa

5383 4558 5383 4558

Trevor Robinson PO Box 2 Warracknabeal

5398 2942 5398 2487 0419 505 693

Don Cook 17 McKenzie Street Beulah

5390 2362 0429 996 819 [email protected]

Bert Hallam 73 Evelyn Street Hopetoun

5083 3236 0417 012 003

Frank Baker 826 Greenhills Road Jung

5384 7370

Gavin Whyte 2503 Wimmera Hwy Jung

5384 7381 0427 314 731

Gavin Puls 2860 Wimmera Hwy Jung

5384 7332 5384 7311 0417 018 648



Industry Contacts

Name Group Address Phone Facsimile Mobile

James Magee – MERO Yarriambiack Shire Council PO Box 243, Warracknabeal (w) 46 Austin Street, Hopetoun (h)

5398 0102 (w) 5083 3512 (h)

5398 2502 0429 954 042

Bernie Naylor

– Deputy MERO Yarriambiack Shire Council

PO Box 243, Warracknabeal (w) 4025 Borung Highway, Warracknabeal (h)

5398 0105 (w)

5398 1920 (h) 5398 2502 0418 519 623

Brian Poulton

– Works Co-ordinator Yarriambiack Shire Council

PO Box 243

Warracknabeal 5398 0119 5398 2502 0427 348 501

Peter Jess

– Works Supervisor Yarriambiack Shire Council

PO Box 243

Warracknabeal 5398 1353 5394 1844 0428 373 017

Chris Lehmann

– Works Supervisor Yarriambiack Shire Council

PO Box 243

Warracknabeal 5083 3167 5083 3253 0428 557 301

Hugh Christie Wimmera Catchment Management Authority PO Box 479

Horsham 5382 1544

John Martin GWMWater PO Box 481

Horsham 5362 0223 5382 6192

Ben Dyer GWMWater PO Box 481

Horsham 5362 0223 0428 138 466



Yarriambiack Creek Staff Gauge Locations, Flow Capacities of Structures and Reader Details

Gauge Name Flow Capacity of Structure

Detailed description of gauge location (refer to map on following page)

Reader name & contact details

Alternate reader (name & contact details)

1 Yarriambiack Creek at Off-take

2 Wimmera Highway Bridge at Jung 1,000ML/d

3 Henty Highway at Kellalac

4 Ailsa Road at Kellalac N/A

5 Upstream of outlet from the Warracknabeal Weir Pool

3,600ML/d

6 Lah West Road at Lah N/A

7 Brim Weir Pool Inlet Regulator 580ML/d

8 Brim Weir Pool Outlet Regulator (Brim West Road)

750 - 1,300ML/d

9 Galaquil West Road at Galaquil 500ML/d

10 Upstream side of the Birchip-Rainbow Road culverts at Beulah

11 Henty Highway at Hopetoun

12 Between Lake Corrong and Lake Lascelles at Hopetoun



ATTENTION: FLOOD MONITORING OFFICER – YARRIAMBIACK SHIRE COUNCIL

Y A R R I A M B I A C K C R E E K F L O O D M O N I T O R I N G R E P O R T

Reading 1 Reading 2 Reading 3 Reading 4 Reading 5 Reading 6 Reading 7 Reading 8

Readers name

Contact phone number

Name / Location of Gauge

Date / Time

Local weather conditions Describe: rain, wind, cloud cover, etc

Gauge reading

Rising (R), Steady (S), Falling (F)

Peak of flood

Approximate date / time of peak

FAX: 5398 2502

Please fax to Yarriambiack Shire Council every 12 or 24 hours (near 7am and 6pm) during flood monitoring periods as requested.

A P P E N D I X D – G U I D E L I N E S F O R F L O O D M O N I T O R I N G

A N D W E I R O P E R A T I O N


Y A R R I A M B I A C K C R E E K F L O O D S U M M A R Y R E P O R T

Date: __________________________ Time: ________________________

Gauge Description Level Level

(m AHD) Flood Status Flow Condition

1 Yarriambiack Creek at Off-take

2 Wimmera Highway Bridge - Jung

3 Henty Highway at Kellalac

4 Ailsa Road at Kellalac

5 Outlet of Warracknabeal Weir Pool at Warracknabeal

6 Lah West Road at Lah

7 Brim Weir Pool Inlet Regulator

8 Brim Weir Pool outlet Regulator (Brim West Road)

9 Galaquil West Road at Galaquil

10 Birchip-Rainbow Road at Beulah

11 Henty Highway at Hopetoun

12 Between Lake Corrong & Lake Lascelles, Hopetoun

Flood Monitoring Instructions: Flood Warning Advice: Flood Management Instructions:

Beulah:

Brim:

Warracknabeal:

Signed: __________________________________________

A P P E N D I X E – F L O O D C L A S S L E V E L S


Minor Flooding: Causes inconvenience. Low lying areas next to watercourses are inundated which may require the removal of stock and equipment. Minor roads may be closed and low-level bridges submerged.

Moderate Flooding: In addition to the above, the evacuation of some houses may be required. Main traffic routes may be covered. The area of inundation is substantial in rural areas requiring the removal of stock.

Major Flooding: In addition to the above, extensive rural areas and / or urban areas are inundated. Properties and towns are likely to be isolated and major traffic routes likely to be closed. Evacuation of people from flood affected areas may be required.

FLOOD CLASS LEVELS for river gauges of interest to Yarriambiack Shire Council1

River Station Minor Moderate Major Gauge Zero

Wimmera River at Glenorchy 4.0m 4.75m 4.9m

Wimmera River at Horsham

Wimmera River at Walmer

Wimmera River at Quantong Bridge 2.7m 3.7m 4.8m

NOTE 1: as extracted from the Bureau of Meteorology’s website (www.bom.gov.au) on 1 December 2005.

It is emphasised that the flood levels quoted in the table above refer to that part of the river where the flood effects can be related to the gauge reading.

The occurrence of a certain class of flooding at one point in a catchment will not necessarily lead to the same class of flooding at other points. This is because the floodplain physiography and use (and thus flood impact) varies along the river and also because antecedent conditions combined with where and how rainfall occurs (both in time and space) will drive how a flood develops and progresses along the river. For example, major flooding at Glenorchy will not always lead to major flooding at Horsham or along Yarriambiack or Dunmunkle creeks and similarly.

It is important to remember that flood impact is dependent on more than the peak height or flow. The rate of rise, duration, extent and season of flooding are also important. For this reason, flood class levels can only be considered as a guide to flood severity.

Flood class levels are revised from time to time as experience accumulates and conditions change in affected areas. It is up to Municipalities to drive this process and to ensure that flood class levels reflect community needs. Flood class levels are a key input to Service Level Agreements (see Appendix F).

A P P E N D I X F – S E R V I C E L E V E L A G R E E M E N T


Intentionally left blank until such time as the Bureau of Meteorology indicates an intention to provide specific

flood forecast and warning services for one or more watercourses within the Municipality. Provision of such a

service is unlikely to occur until after YSC approaches the Bureau and VFWCC with a request for services.

A P P E N D I X G – I N F O R M A T I O N F L O W C H A R T


Not Available from CMA at this stage

A P P E N D I X H – W A R N I N G D I S S E M I N A T I O N L I S T


Agencies, organisations or entities Provided by Delivery method

A P P E N D I X I – M A P S


1. Catchment Map

2. Flood Inundation Maps

The flood inundation maps prepared as a result of the Warracknabeal and Beulah Flood Study (Water Technology, 2007) are listed below. These maps are available in hard copy form and as PDF’ed digital copies at the YSC MECC.

No. Drawings for Beulah

1 10 year Average Recurrence Interval Flood Event Flood Extents and Depths at Beulah (1 sheet)




No. Drawings for Warracknabeal

5 10 year Average Recurrence Interval Flood Event Flood Extents and Depths at Warracknabeal (1 sheet)




9 Extent of flooding at Warracknabeal resulting from the local 100-year ARI rainfall event – aerial photo (1 sheet)

10 Extent of flooding at Warracknabeal resulting from the local 100-year ARI rainfall event (1 sheet)

The maps also identify houses and other buildings likely to be flooded above floor level by each event. Surveyed floor levels have been compared to predicted flood heights. A red dot is used to show each floor level lower than the expected flood height (ie. over floor flooding is likely).


Yarriambiack Shire Council Flood Response Plan September 2009

Copies of the Flood Inundation Maps at Item 2. (Beulah 1-4 and Warracknabeal 5-10) as previously referenced on Page 67 of this plan have been excluded from this PDF Version of Yarriambiack Shire Council’s Flood Response Plan. Copies of these maps are able to be viewed and/or printed at the link listed underneath our plan link on our website:- Flood Maps Warracknabeal 2007 10year, 20year, 50 year, 100 year flood maps and 100 year storm map Beulah 2007 20year, 50 year, 100 year and 200 year flood maps and 100 year storm map Copies of these maps are available in hard copy form and as PDF’ed digital copies from the Council’s Municipal Office at 34 Lyle Street Warracknabeal, telephone 5398 0100.

Pages 69 – 78 have been excluded from this Copy

NEXT PAGE – 79



3. Roads Likely to be Flooded near Yarriambiack Creek in a large flood (working north from the Wimmera River)

Road Comments

Lubeck Road

Barrabool Road

Burnt Clay Road

Gellatlys Road

Longerenong Road

Sawpit Swamp Road

Webb Road

Cavans Road

Delahuntys Road

Flume Road

Reserve Road

Greenhills Road

Bells Road

Banyena Road

Smiths Road

Mokepilly Road

Kewell Road

Three Chain Road

Five Chain Road

Yarriambiack Drive

Roses Road

Mayberrys Road

Moloneys Road

Ailsa Road

Aubrey Road

Langleys Road

Morella Road

Bangerang Road

Darts Road

Goads Road

Lah west Road

Baums Road

Galaquil West Road

Brentwood West Road

Golf Hill Road

Rosebery Rainbow Road

Windy Ridge Road

Rosebery Road

Goyura West Road floodway

Robins Road



The above list is probably very conservative and will need to be edited as experience builds, bearing in mind that bigger floods are more likely to flood roads than smaller floods. Consider adding information about when these roads flood into the flood intelligence cards at Appendix A.

4. Roads Likely to be Flooded near Dunmunkle Creek in a large flood (working north from the Shire boundary)

Road Comments

Stawell Warracknabeal Road

Bryntirion Road

Matthews Road

Jackson Road

Hopfields Road

C. Readings Road

Ballantines Road

Lallat North Road

Minyip Banyena Road

Gun Club Road

Rich Avon Road

Back Road

Dunmunkle Road

Delavedovas Road

Donald Mutoa Road

McLachlans Road

Milgates Road

Walkers Road

Lawler Road

Boolite West Road

The above list is probably very conservative and will need to be edited as experience builds, bearing in mind that bigger floods are more likely to flood roads than smaller floods. Consider adding information about when these roads flood into the flood intelligence cards at Appendix A.

- R E F E R E N C E S -


Agricultural and Resource Management Council of Australia and New Zealand (ARMCANZ) (2000), Standing Committee on Agriculture and Resource Management (SCARM) Report No 73: Floodplain Management in Australia, Best Practice Principles and Guidelines.

Department of Infrastructure (DoI) (2000a): Victoria Planning Provisions (VPPs).

Department of Infrastructure (DoI) (2000b): Victoria Planning Provisions Practice Notes: Applying the Flood Provisions in a Planning Scheme, A Guide for Councils.

Department of Infrastructure (DoI) (2000c): Victoria Planning Provisions Practice Notes: Applying for a Planning Permit under the Flood Provision, A Guide for Councils, Referral Authorities and Applicants.

Department of Natural Resources and Environment (DNRE) (1998a): Victoria Flood Management Strategy.

Department of Natural Resources and Environment (DNRE) (1998b), Floodplain Management Unit: Advisory Notes for Delineating Floodways.

Department of Natural Resources and Environment (DNRE) (2000): Flood Data Transfer Project – River Basin Report: Wimmera River. Prepared for DNRE by Sinclair Knight Merz, June 2000.

Emergency Management Australia (EMA) (1999a): Managing the Floodplain. Australian Emergency Manual Series Part 3 (Emergency Management Practice) Volume 3, Guide 3.

Emergency Management Australia (EMA) (1999b): Flood Response. Australian Emergency Manual Series Part 3 (Emergency Management Practice) Volume 3, Guide 6.

Emergency Management Australia (EMA) (1999c): Flood Warning – 2nd edition. Australian Emergency Manual Series Part 3 (Emergency Management Practice) Volume 3, Guide 5.

Emergency Management Australia (EMA) (1999d): Flood Preparedness. Australian Emergency Manual Series Part 3 (Emergency Management Practice) Volume 3, Guide 4.

Emergency Management Australia (EMA) (1999e): Emergency Management Planning for Flood Affected by Dams. Australian Emergency Manual Series Part 3 (Emergency Management Practice) Volume 3, Guide 7.

Fluvial Systems Pty Ltd (2006): Hydrology of Yarriambiack Creek, Lake Corrong and Lake Lascelles. Report to Ecological Associates as a contribution to the project ‘Lake Corrong and Lake Lascelles Wetland Investigations’ for the Mallee Catchment Management Authority.

Kellogg Brown & Root (2004): Yarriambiack Creek Management Plan 2004. Prepared for the Yarriambiack Creek Advisory Committee on behalf of the Wimmera and Mallee Catchment Management Authorities, the Yarriambiack Shire Council and the Department of Sustainability and Environment.

Parsons Brinckerhoff (2002): Wimmera Region Urban Stormwater Management Plan – Volume 1. Prepared for the Wimmera Catchment Management Authority.

SMEC (2001): Assessment of the Impact of Priority Structures on Natural Flow Regimes and Flooding in Yarriambiack Creek. Prepared for the Wimmera Catchment Management Authority

State Rivers & Water Supply Commission (SRWSC) (1982a): Horsham Floodplain Management Study Volume 1 – Final Report.

State Rivers & Water Supply Commission (SRWSC) (1982b): Horsham Floodplain Management Study Volume 2 – Technical Report.

Water Technology Pty Ltd (2003): Horsham Flood Study Report. (Report No J035/R3 Final, Ver. A), February 2003.

Water Technology Pty Ltd (2006): Glenorchy Floodplain Management Study and Flood Study Report. (Report No J140/R01G, Draft A), January 2006.

Water Technology Pty Ltd (2007): Warracknabeal and Beulah Flood Study Report. (Report No J404/R03 Draft B), February 2007.

WBM Oceanics Australia (2003): Yarriambiack Creek Flood Investigation Study. Prepared for the Wimmera Catchment Management Authority and the Mallee Catchment Management Authority

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