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Yarriambiack Shire Council Flood Response Plan

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					     Yarriambiack Shire Council
        Flood Response Plan
A Sub Plan of the Municipal Emergency Management Plan


              Controlled Copy Number ……


                   September 2009
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, preferably single sided, and inserted as a
                             sub document in the MEMP 2-ring binder.

                             Part 5 and Appendices A and B of this document are to be printed on YELLOW PAPER.

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:             Document Transmittal Forms together with any 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 and return the signed Document Transmittal Form
                             along with superseded pages to the Yarriambiack Shire Council MERO.

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




Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                             Page    i
                                                             - CONTENTS -

                                                                                                                                                              Page
Distribution List.................................................................................................................................................. iv
Amendment Certificate....................................................................................................................................... v
List of Abbreviations and Acronyms .................................................................................................................. vi

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
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
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
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
1. Introduction ..................................................................................................................................13
  1.1     Activation of Response ......................................................................................................13
  1.2     Municipal Involvement ......................................................................................................13
  1.3     Escalation ...........................................................................................................................13
  1.4     Stand Down........................................................................................................................13
2. Flood Triggers ..............................................................................................................................13
3. Flood Monitoring and Warning Systems ..........................................................................................13
Yarriambiack Shire Council Flood Response Plan – Draft V4                                        September 2009                                            Page ii
                                                         - CONTENTS -

   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
1. General ........................................................................................................................................18
1. General ........................................................................................................................................19
1. General ........................................................................................................................................20
2. Flood Inundation Mapping..............................................................................................................20
3. Digital Datasets and Aerial Flood Photography ................................................................................20
4. Overview of Flooding Issues ..........................................................................................................21
   4.1      The River System...............................................................................................................21
   4.2      The Flood Threat................................................................................................................22
   4.2.1        Yarriambiack Creek .......................................................................................................22
   4.2.2        Dunmunkle Creek ..........................................................................................................22
   4.2.3        Wimmera River..............................................................................................................23
   4.2.4        Richardson River............................................................................................................23
   4.3      Channel Capacities.............................................................................................................23
   4.4      Historic Floods...................................................................................................................23
5. Rainfall and Flooding.....................................................................................................................23
   5.1      General Guidance...............................................................................................................23
   5.2      At Warracknabeal ..............................................................................................................23
   5.3      At Beulah ...........................................................................................................................23
6. Impact of the Wimmera Mallee Pipeline...........................................................................................24
7. Flood Intelligence Cards ................................................................................................................24
8. Typical Flood Peak Travel Times....................................................................................................34
General ................................................................................................................................................56
Update of Flood History .........................................................................................................................57
1894 flood ............................................................................................................................................57
August 1909 Flood ................................................................................................................................57
July 1974..............................................................................................................................................57
August 1981 Flood ................................................................................................................................57
General Statement of Operational Responsibilities ...................................................................................58
General Philosophy for Weir Operation along Yarriambiack Creek in the Lead up to and During Flood .........58
Monitoring Flood Flows along Yarriambiack Creek ...................................................................................58
Yarriambiack Creek Staff Gauge Locations, Flow Capacities of Structures and Reader Details ....................61
Gauge..................................................................................................................................................61
Name...................................................................................................................................................61
Flow Capacity of Structure .....................................................................................................................61
Detailed description of gauge location (refer to map on following page)......................................................61
Reader name & contact details...............................................................................................................61
Alternate reader (name & contact details)................................................................................................61
1     61
Yarriambiack Creek at Off-take...............................................................................................................61

Yarriambiack Shire Council Flood Response Plan – Draft V4                                September 2009                                        Page iii
                                                        - CONTENTS -

2     61
Wimmera Highway Bridge at Jung ..........................................................................................................61
1,000ML/d ............................................................................................................................................61
3     61
Henty Highway at Kellalac......................................................................................................................61
4     61
Ailsa Road at Kellalac............................................................................................................................61
N/A 61
5     61
Upstream of outlet from the Warracknabeal Weir Pool..............................................................................61
3,600ML/d ............................................................................................................................................61
6     61
Lah West Road at Lah ...........................................................................................................................61
N/A 61
7     61
Brim Weir Pool Inlet Regulator ...............................................................................................................61
580ML/d...............................................................................................................................................61
8     61
Brim Weir Pool Outlet Regulator (Brim West Road) ..................................................................................61
750 - 1,300ML/d....................................................................................................................................61
9     61
Galaquil West Road at Galaquil..............................................................................................................61
500ML/d...............................................................................................................................................61
10 61
Upstream side of the Birchip-Rainbow Road culverts at Beulah.................................................................61
11 61
Henty Highway at Hopetoun...................................................................................................................61
12 61
Between Lake Corrong and Lake Lascelles at Hopetoun ..........................................................................61
ATTENTION: FLOOD MONITORING OFFICER – YARRIAMBIACK SHIRE COUNCIL .............................62
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 ...............62
Reading 1.............................................................................................................................................62
Reading 2.............................................................................................................................................62
Reading 3.............................................................................................................................................62
Reading 4.............................................................................................................................................62
Reading 5.............................................................................................................................................62
Reading 6.............................................................................................................................................62
Reading 7.............................................................................................................................................62
Reading 8.............................................................................................................................................62
Readers name ......................................................................................................................................62
Contact phone number ..........................................................................................................................62
Name / Location of Gauge .....................................................................................................................62
Date / Time...........................................................................................................................................62
Local weather conditions Describe: rain, wind, cloud cover, etc .................................................................62
Gauge reading......................................................................................................................................62
Rising (R), Steady (S), Falling (F) ...........................................................................................................62
Peak of flood ........................................................................................................................................62
Approximate date / time of peak .............................................................................................................62
FAX: 5398 2502 ................................................................................................................................62
Please fax to Yarriambiack Shire Council every 12 or 24 hours (near 7am and 6pm) during flood monitoring
periods as requested. ............................................................................................................................62
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 ........................63

Yarriambiack Shire Council Flood Response Plan – Draft V4                               September 2009                                       Page iv
                                                             - CONTENTS -

1. Catchment Map ............................................................................................................................68
2. Flood Inundation Maps ..................................................................................................................68
3. Roads Likely to be Flooded near Yarriambiack Creek in a large flood (working north from the Wimmera
River)...................................................................................................................................................68
4. Roads Likely to be Flooded near Dunmunkle Creek in a large flood (working north from the Shire
boundary).............................................................................................................................................69

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................................................................................................................. 64
Appendix F              Service Level Agreement ....................................................................................................... 65
Appendix G              Information Flow Chart........................................................................................................... 66
Appendix H              Warning Dissemination .......................................................................................................... 67
Appendix I              Maps ...................................................................................................................................... 68

Aide Memoires ................................................................................................................................................. 71

References....................................................................................................................................................... 72




Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009                                            Page v
                                 - DISTRIBUTION LIST -

             No of                                          Issue To:
 Copy
            copies                                                                                       Date
Number                              Name                                    Organisation
             held
Original                                                     YSC MEMP Committee Executive Officer
   1                                                         YSC Office Copy
   2                                                         YSC MEMP Committee Chairman
   3                                                         YSC MERO
   4                                                         YSC Deputy MERO
   5                                                         YSC MRM
   6                                                         MERC (Warracknabeal Police Station)
   7                                                         DERC (Ballarat)
   8                                                         Horsham Police Station (24-hour)
   9                                                         Hopetoun Police Station
   10                                                        Murtoa Police Station
   11                                                        Beulah Police Station
   12                                                        VICSES (Warracknabeal unit)
   13                                                        VICSES (Regional Headquarters - Ballarat)
   14                                                        Wimmera CMA
   15                                                        Mallee CMA
   16                                                        DSE (Horsham)
   17                                                        GWM Water
   18                                                        Rural Ambulance Victoria (Ballarat unit)
   19                                                        CFA (Warracknabeal group)
   20                                                        CFA (Regional Headquarters – Horsham)
   21                                                        CFA (Regional Headquarters – Swan Hill)
   22                                                        VicRoads (Ballarat)
   23                                                        Human Services Victoria (Ballarat)
   24                                                        Bureau of Meteorology (Flood Warning)
   25
   26
   27
   28
   29                                                        Spare Copies
   30




Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                     Page vi
                          - AMENDMENT CERTIFICATE -

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           Date of          Amendment
                                                                       Summary of Amendment
 Number           Amendment          Entered By




Yarriambiack Shire Council Flood Response Plan – Draft V4            September 2009                        Page vii
         - LIST OF ABBREVIATIONS AND ACRONYMS -

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


Yarriambiack Shire Council Flood Response Plan – Draft V4         September 2009            Pageviii
                                 PART 1 – INTRODUCTION

1. Municipal Endorsement
This Flood Response Plan has been prepared by and with the authority of the Yarriambiack Shire Council pursuant to
Section 19 Part 4 of the Emergency Management Act 1986 (as amended).
The Victoria Flood Management Strategy (DNRE, 1998a) provides the principal framework for floodplain management in
Victoria and outlines the floodplain management roles of key agencies at a regional and local scale. It also contains
reference to the intention to incorporate a risk management approach into the Ministerial Guidelines for municipal
emergency management planning. Further, the strategy identifies the regional catchment strategies and regional
floodplain management strategies prepared by the Catchment Management Authorities (CMAs) as the principal regional
planning instruments while the Municipal Strategic Statement and the Municipal Planning Scheme and associated
floodplain management plans as prepared by Councils are identified as the local planning instruments. Together, the
emphasis of these planning instruments is on the ‘wise use’ of the Region’s floodplains, where ‘wise use’ may be
categorised as any set of activities that are compatible with the risk to natural resources (the natural and beneficial
functions of the floodplain) and human resources (life and property). An important element of such planning instruments
is recognition that the key to sound floodplain management is effective floodplain land use management and associated
response (rather than physical / structural) modifications. This is reflected in current Australian best practice guides (eg.
EMA, 1999a & b; ARMCANZ, 2000) and in Victorian State policy (eg. DNRE, 1998a; DoI, 2000a, b & c) and more
particularly in the Yarriambiack Planning Scheme and associated Schedules.
With the shift to a risk based approach to floodplain management within Australia and development of strategies for
reducing but not necessarily eliminating the overall risk (as in many cases risk cannot be entirely eliminated), the
emphasis has moved from the implementation of structural solutions for flooding to ‘softer’ non-structural solutions. Non-
structural solutions recognise the value of floodplains and their processes as well as the economic and social benefits
that flow from their development and as such represent ‘wise use’. The emphasis is on modifying how to develop / use
floodplains (ie. response modification measures that seek to modify human behaviour through activities such as
awareness campaigns, education, warning systems and planning / land management - the human interface) rather than
on modifying the floodplains so that they can be developed. This shift recognises that people’s reactions to impending
floods and warnings have a substantial effect on the losses that subsequently occur. In turn this highlights the need for
and value of Flood Response Plans.
This Flood Response Plan takes into account the outcomes of the Community Emergency Risk Management (CERM)
process undertaken by the YSC and the flood related Schedules to the Yarriambiack Planning Scheme as may exist for
the various precincts of the Municipality as well as the (likely) contents of floodplain management plans (currently being)
prepared in conjunction with the Wimmera and / or Mallee Catchment Management Authorities. This Plan therefore
aims to facilitate an effective response to any flood event that might arise within the Municipality now and into the future.
The Yarriambiack Shire Council is mindful of its obligations to plan for flood and other emergencies and both
understands and accepts its roles and responsibilities as described in Part 4 of the Emergency Management Act 1986
(as amended) and detailed in the Emergency Management Manual Victoria.
This Flood Response Plan is a result of the cooperative efforts of the Yarriambiack Shire Council Municipal Emergency
Management Planning Committee after consultation with relevant agencies and organisations.


THE COMMON SEAL of the YARRIAMBIACK SHIRE COUNCIL                         )
was hereunto affixed this ……. day of ……....………….. 2008                    )
approving and adopting this Plan in the presence of:                      )                        LEGAL
                                                                          )
                                                                                                     SEAL
…………………………………………….………………………………….. Mayor

…………………………………………….………………………………….. Councillor

…………………………………………….………………………………….. Chief Executive Officer


Yarriambiack Shire Council Flood Response Plan – Draft V4               September 2009                          Page 1 of 72
                                  PART 1 – INTRODUCTION

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

Yarriambiack Shire Council Flood Response Plan – Draft V4                 September 2009                          Page 2 of 72
                                PART 1 – INTRODUCTION

    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.




Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                        Page 3 of 72
                            PART 2 – THE MUNICIPALITY

1. General
The Yarriambiack Shire Council has a population of more than 8,200 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 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.


Yarriambiack Shire Council Flood Response Plan – Draft V4              September 2009                         Page 4 of 72
                            PART 2 – THE MUNICIPALITY

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 and on the CD located at the back of this Plan.
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


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              PART 3 – MANAGEMENT ARRANGEMENTS

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.


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               PART 3 – MANAGEMENT ARRANGEMENTS

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 Service 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.
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              PART 3 – MANAGEMENT ARRANGEMENTS

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.



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PART 4 – PREVENTION/PREPAREDNESS ARRANGEMENTS

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 inundate;
♦   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.
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PART 4 – PREVENTION/PREPAREDNESS ARRANGEMENTS

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.
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PART 4 – PREVENTION/PREPAREDNESS ARRANGEMENTS

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
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PART 4 – PREVENTION/PREPAREDNESS ARRANGEMENTS

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 variously 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.




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                  PART 5 – RESPONSE ARRANGEMENTS

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.



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                    PART 5 – RESPONSE ARRANGEMENTS

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.
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                   PART 5 – RESPONSE ARRANGEMENTS

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 following 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 4 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.
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                  PART 5 – RESPONSE ARRANGEMENTS

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 response 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).


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                 PART 5 – RESPONSE ARRANGEMENTS




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                   PART 6 – SUPPORT ARRANGEMENTS

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.




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                 PART 7 – RECOVERY ARRANGEMENTS

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.




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                   APPENDIX A - FLOOD INTELLIGENCE

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 and on the CD located at the back of this Plan.
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.

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                     APPENDIX A - FLOOD INTELLIGENCE

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
Aerial flood photography                                        7 & 10 August 1981 (vertical photography)
                           Warracknabeal
                                                                9 – 10 September 1983 (video & oblique photography)
                           Near Wimmera River/Yarriambiack
                                                                3 September 1988 (oblique photography)
                           Creek confluence
                                                                2 & 4 October 1996 (oblique photography)
                           Near Wimmera River/Yarriambiack      Outer envelope of known floods from 1909 – 1985 based on
Interpreted flood extent
                           Creek confluence                     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
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                   APPENDIX A - FLOOD INTELLIGENCE

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 to 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.

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                   APPENDIX A - FLOOD INTELLIGENCE

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.
Analyses 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 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.

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                   APPENDIX A - FLOOD INTELLIGENCE

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, business) and for different locations within the reference area for the river gauge. In doing so, the
record marries the physical and social information gathered during hazard and community analyses 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.




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                                                     APPENDIX A - FLOOD INTELLIGENCE

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.

                                                                         WIMMERA RIVER at GLENORCHY
      River      River Flow
                                           Consequence / Impact within Yarriambiack Shire                                         Action4                                  Comments
    Height (m)     (ML/d)
                                 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
                                                                                                               Driving in a normal car likely to be dangerous.
      5.03m       33,350ML/d     Many Shire roads and low level bridges flooded – see list at Appendix I.      Ensure all low level bridges and river            1% AEP (100 year ARI) event
                                                                                                               crossings are closed.
                                                                                                               Consider need to evacuate or resupply rural
      5.03m       33,350ML/d                                                                                                                                     1% AEP (100 year ARI) event
                                                                                                               properties.
      5.01m       29,730ML/d                                                                                                                                     2% AEP(50 year ARI) event
                                                                                                                                                                 September 1988 event
      4.97m       25,200ML/d
                                                                                                                                                                 4.3% AEP (23 year ARI)
      4.96m       24,320ML/d                                                                                                                                     5% AEP (20 year ARI) event
                                                                                                               Advise rural property owners that they may be     October 1973 event
      4.94m       22,800ML/d
                                                                                                               isolated for some days.                           6.4% AEP (16 year ARI)
                                                                                                                                                                 October 1975 event
      4.91m       20,100ML/d
                                                                                                                                                                 9.4% AEP (11 year ARI)
      4.90m       19,720ML/d                                                                                                                                     10% AEP (10 year ARI)
                                                                                                               Erect “Water Over Road” and “Road Closed”
                                                                                                               signs as appropriate.
                                                                                                                                                                 Major Flood Level
      4.90m       19,300ML/d     Flooding up to 0.25m deep along upper reaches of Dunmunkle Creek.             Advise that driving in water more than 300mm      10% AEP (10 year ARI)
                                                                                                               deep is highly dangerous and may result in
                                                                                                               loss of life.
      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)
Yarriambiack Shire Council Flood Response Plan – Draft V4                                                     September 2009                                                       Page 25 of 72
                                                  APPENDIX A - FLOOD INTELLIGENCE

                                                                       WIMMERA RIVER at GLENORCHY
   River        River Flow
                                        Consequence / Impact within Yarriambiack Shire                                             Action4                                  Comments
 Height (m)       (ML/d)
                                                                                                                                                                  13% AEP (7.7 year ARI)
                                                                                                                                                                  August 1981 event
    4.85m       17,200ML/d
                                                                                                                                                                  14% AEP (7 year ARI)
                                                                                                                                                                  October 1992 event
    4.79m       15,000ML/d
                                                                                                                                                                  19% AEP (5.3 year ARI)
                                                                                                                                                                  October 1996 event
    4.78m       14,800ML/d
                                                                                                                                                                  19.5% AEP (5.1 year ARI)
    4.77m       14,600ML/d                                                                                                                                        20% AEP (5 year ARI) event
                                                                                                                                                                  Moderate Flood Level
    4.75m       14,200ML/d
                                                                                                                                                                  21% AEP (4.7 year ARI)
                                                                                                                                                                  August 1980 event
    4.72m       13,500ML/d
                                                                                                                                                                  23% AEP (4.4 year ARI)
                                                                                                                 Advise landholders so that stock can be
    4.65m                     Flows likely in the upper reaches of Dunmunkle Creek
                                                                                                                 moved from low lying areas.
                                                                                                                 Erect “Water Over Road” signs as appropriate.
                                                                                                                 Advise property owners in rural areas of the
                              Likely that some rural land will be inundated and some road become                 likelihood of some road and property flooding.
    4.50m       10,075ML/d
                              progressively more flood affected.                                                 Advise that driving in water more than 300mm
                                                                                                                 deep is highly dangerous and may result in
                                                                                                                 loss of life.
                              Localised minor flooding of rural land adjacent to the Wimmera River.              Advise landholders so that stock can be          Minor Flood Level
    4.00m        7,000ML/d
                              Flows likely in upper reaches of Yarriambiack Creek if river continues to rise.    moved from low lying areas.                      50% AEP (2 year ARI)




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




Yarriambiack Shire Council Flood Response Plan – Draft V4                                                       September 2009                                                      Page 26 of 72
                                                    APPENDIX A - FLOOD INTELLIGENCE

7.4       Gauge Location: Upstream of the Outlet from the Warracknabeal Weir Pool
                                                             YARRIAMBIACK CREEK at WARRACKNABEAL
                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.
                Depth of                                     It is assumed that the Committee of Management will keep weirs free of debris
     Surface                 Creek
                Water at
    Elevation
                 Gauge
                              Flow                                                                                                                                                      Comments
    (m AHD)                  (ML/d)                    Consequence / Impact within the Municipality                                                 Action5
                  (m)
                                                                                                                                                                                     Probable Maximum
                                        No information other than more damaging than the 200 year ARI event.
                                                                                                                                                                                     Flood (PMF)
                                                                                                                                 Consider need to evacuate or resupply rural         0.5% AEP (200 year
    108.72m      2.92m      3,776ML/d   Many properties flooded over floor.
                                                                                                                                 properties.                                         ARI) event
                                        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        Door knock, sandbag or evacuate houses
                                        Borung Highway and Warracknabeal-Jeparit Road.                                           identified as subject to over floor flooding (see
                                        Flow across Cemetery Road and at end of Wood Street is up to 0.5m deep.                  list at Appendix B and flood inundation maps
                                        Water extends half way across the rear oval at the Secondary College.                    at Appendix I).
                                        Water up to 0.5m deep extends up McIntyre Street and into No 3.                          Close the Borung Highway if not already done.
                                        Apex Park is flooded along with parts of St Marys School.                                Consider closing the Henty Highway
                                                                                                                                                                                     1% AEP (100 year
    108.70m      2.90m      3,577ML/d   Water up to 0.25m deep flows over the Borung Highway to the west of the Creek            Erect road signage as appropriate.                  ARI) event
                                        crossing and down Craig Avenue to Noall Street.                                          If it is raining heavily in Warracknabeal while
                                        Water up to 250mm deep through the Caravan Park and up to 500mm deep at the              the Creek is in flood, expect flood impacts
                                        entrance from Lyle Street.                                                               across town to be more severe and look at
                                        Flow across Fong Tong Avenue and Warunda Avenue more than 0.5m deep                      earlier warning of house flooding and road
                                        becomes a little shallower and extends across the end of Woolcock Street and down        closures (see flood inundation maps at
                                        The Avenue to the intersection with Anderson Street causing over floor flooding of 9     Appendix I).
                                        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.


5   All references to unsafe driving depths have been extracted from Appendix J of Floodplain Management in Australia, Best Practice Principles and Guidelines (ARMCANZ, 2000)
Yarriambiack Shire Council Flood Response Plan – Draft V4                                                       September 2009                                                           Page 27 of 72
                                                     APPENDIX A - FLOOD INTELLIGENCE

                                                              YARRIAMBIACK CREEK at WARRACKNABEAL
              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.
              Depth of                                        It is assumed that the Committee of Management will keep weirs free of debris
  Surface                    Creek
              Water at
 Elevation                    Flow                                                                                                                                                Comments
               Gauge                                    Consequence / Impact within the Municipality                                             Action5
 (m AHD)                     (ML/d)
                (m)
                                         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.
                                     Breakout across Cemetery Road more extensive and encroaching on rear oval at          Door knock, sandbag or evacuate houses
                                     Secondary College mostly around 0.25m deep. Flow returns to the Creek near the        identified as subject to over floor flooding (see
                                     end of Wood Street.                                                                   list at Appendix B and flood inundation maps
                                     Water up to 0.25m deep extends up McIntyre Street and lapping the edge of the         at Appendix I).
                                     Borung Highway to the west of the Creek crossing.                                     Evacuate the Caravan Park if not done yet.
                                     Apex Park and most of the Caravan Park are flooded.                                   Close the Warracknabeal-Jeparit Road if not
                                                                                                                           already done.                                       2% AEP (50 year
  108.66m     2.86m      2,704ML/d 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 Erect further “Water Over Road” and “Road                ARI) event
                                     the intersection with Anderson Street causing over floor flooding of 6 houses and     Closed” signs as appropriate.
                                     below floor flooding of a further 27 properties in this area.                         Advise that driving in water more than 300mm
                                     Most of the Woodbine Training Centre and surrounding streets down to the              deep is highly dangerous and may result in
                                     Warracknabeal-Jeparit Road are flooded to between 0.25m and 0.5m depth. A total loss of life.
                                     of 33 houses suffer over floor flooding (see Appendix B).                             If it is raining heavily in Warracknabeal while
                                     The GWMWater sewerage pump station on Craig Avenue between Tobruk Avenue              the Creek is in flood, expect flood impacts
Yarriambiack Shire Council Flood Response Plan – Draft V4                                                    September 2009                                                        Page 28 of 72
                                                 APPENDIX A - FLOOD INTELLIGENCE

                                                          YARRIAMBIACK CREEK at WARRACKNABEAL
             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.
             Depth of                                     It is assumed that the Committee of Management will keep weirs free of debris
  Surface                  Creek
             Water at
 Elevation                  Flow                                                                                                                                              Comments
              Gauge                                  Consequence / Impact within the Municipality                                            Action5
 (m AHD)                   (ML/d)
               (m)
                                      and Kokoda Avenue flooded.                                                           across town to be more severe and look at
                                      The GWMWater sewerage pump station on Ross Street between Kurrajong Street           earlier warning of house flooding and road
                                      and Clifford Street is flooded.                                                      closures (see flood inundation maps at
                                                                                                                           Appendix I).
                                      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.
                                                                                                                           Advise residents of likely flooding (see
                                                                                                                           Appendix B).
                                                                                                                           Consider evacuating the Caravan Park.
                                                                                                                           Advise rural property owners that they may be
 108.55m      2.75m         N/A                                                                                            isolated for some days.
                                                                                                                           Deploy further “Water Over Road” and “Road
                                                                                                                           Closed” signs as appropriate.
                                                                                                                           Consider closing the Warracknabeal-Jeparit
                                                                                                                           Road.
                                      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.
                                                                                                                           Advise residents of likely flooding (see
                                      Flows across Fong Tong Avenue, Warunda Avenue and The Avenue around 0.25m            Appendix B).
                                      deep with some flooding of adjacent properties.
                                                                                                                           Consider relocating vans in the Caravan Park.   5% AEP (20 year
 108.47m      2.67m      1,788ML/d    Shallow breakout near the Creek end of Kokoda Avenue flows into Kokoda Avenue
                                                                                                                           Deploy “Water Over Road” and “Road Closed”      ARI) event
                                      and Craig Avenue, causing over floor flooding of 4 houses and below floor flooding
                                                                                                                           signs as appropriate.
                                      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.            See flood inundation maps at Appendix I.
                                      Creek end of Asquith Avenue flooded up to 0.5m deep.
                                      Craig Avenue and 30 adjoining properties flooded up to 0.25m deep.

Yarriambiack Shire Council Flood Response Plan – Draft V4                                                 September 2009                                                       Page 29 of 72
                                                  APPENDIX A - FLOOD INTELLIGENCE

                                                              YARRIAMBIACK CREEK at WARRACKNABEAL
             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.
             Depth of                                         It is assumed that the Committee of Management will keep weirs free of debris
  Surface                  Creek
             Water at
 Elevation                  Flow                                                                                                                                                  Comments
              Gauge                                   Consequence / Impact within the Municipality                                             Action5
 (m AHD)                   (ML/d)
               (m)
                                      Water lapping edge of Warracknabeal-Jeparit Road west of Creek crossing.
                                      More extensive but shallow breakouts downstream.
                                                                                                                            Consider deploying “Water Over Road” and
               N/A          N/A
                                                                                                                            “Road Closed” signs as appropriate.
                                      Water up to 0.25m deep over Cemetery Road near the Creek.                             Check the stormwater pump located at Anzac
                                                                                                                            Park (Scott & Gardiner streets) and all outlets.   10% AEP (10 year
 108.22m      2.41m      1,261ML/d    Flood flows contained within the Creek corridor through Warracknabeal.                                                                   ARI) event
                                      Shallow breakouts across paddocks to the east downstream of town                      See flood inundation maps at Appendix I.
                                                                                                                                                                               20% AEP (5 year
               N/A       1,149ML/d    Little damage likely.
                                                                                                                                                                               ARI) event
                                                                                                                            Erect “Road Closed” signs on low level and
               N/A          N/A
                                                                                                                            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).
                                                  YSC representative decides in conjunction with Chair of the YCAC that Creek monitoring should commence.
               N/A          N/A
                                             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 analyses 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.



Yarriambiack Shire Council Flood Response Plan – Draft V4                                                   September 2009                                                         Page 30 of 72
                                                   APPENDIX A - FLOOD INTELLIGENCE

7.5       Gauge Location: Upstream side of the Birchip-Rainbow Road culverts at Beulah
                                                                      YARRIAMBIACK CREEK at BEULAH
                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.
                Depth of                                     It is assumed that the Committee of Management will keep weirs free of debris
     Surface                 Creek
                Water at
    Elevation                 Flow                                                                                                                                                     Comments
                 Gauge                                 Consequence / Impact within the Municipality                                                Action6
    (m AHD)                  (ML/d)
                  (m)
                                                                                                                                                                                    Probable Maximum
                                        No information other than more damaging than the 200 year ARI event.
                                                                                                                                                                                    Flood (PMF)
                                                                                                                                Consider need to evacuate or resupply rural
                                                                                                                                properties.                                         0.5% AEP (200 year
     86.02m      1.21m      2,756ML/d   May inundate the water supply storages / ponds.
                                                                                                                                                                                    ARI) event
                                                                                                                                Consider need to evacuate the Caravan Park.
                                        Water up to 0.75m deep across the Henty Highway near rhe 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.               Door knock, sandbag or evacuate houses
                                        The area bounded by the Creek, Lalor Street, Deakin Street, Gladstone Street and        identified as subject to over floor flooding (see
                                        Bell Street flooded to a depth mainly around 0.25m with below flooding of x             list at Appendix B and flood inundation maps
                                        properties in. and 0.5m.                                                                at Appendix I).
                                        Breakout flow from the weir pool is flooding the northern section of Lalor Street and    Advise that driving in water more than 300mm
                                                                                                                                deep is highly dangerous and may result in          1% AEP (100 year
     86.00m      1.20m      2,575ML/d   parts of Gladstone Street and adjacent properties. This flow combines with flows
                                                                                                                                loss of life.                                       ARI) event
                                        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     Advise rural property owners that they may be
                                        station and Health Centre / Hospital.                                                   isolated for some days.
                                        Shallow flow paths are evident through land either side of Phillips Street from Bell    Consider need to relocate Health Centre, CFA
                                        Street to the depression on the northern side of Lascelles Street. Flow over Bell       and Police facilities if not already done.
                                        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.


6   All references to unsafe driving depths have been extracted from Appendix J of Floodplain Management in Australia, Best Practice Principles and Guidelines (ARMCANZ, 2000)
Yarriambiack Shire Council Flood Response Plan – Draft V4                                                      September 2009                                                           Page 31 of 72
                                                  APPENDIX A - FLOOD INTELLIGENCE

                                                                    YARRIAMBIACK CREEK at BEULAH
             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.
             Depth of                                      It is assumed that the Committee of Management will keep weirs free of debris
  Surface                  Creek
             Water at
 Elevation
              Gauge
                            Flow                                                                                                                                                 Comments
 (m AHD)                   (ML/d)                    Consequence / Impact within the Municipality                                               Action6
               (m)
                                      Water at least 0.5m deep across the Henty Highway near rhe 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   Advise residents of likely flooding (see
                                      parts of Gladstone Street and adjacent properties. This flow combines with flows        Appendix B and maps at Appendix I).
                                      breaking out from below the weir pool to affect 32 properties in the area bounded by    Close the Birchip-Rainbow Road if not already
                                                                                                                              done.                                           2% AEP (50 year
  85.95m      1.15m      1,892ML/d    the Creek, Gladstone Street, Phillips Street and Bell Street. This includes the CFA
                                                                                                                                                                              ARI) event
                                      station.                                                                                Deploy “Water Over Road” and “Road Closed”
                                      A shallow flow path is evident through vacant land between Dingwell and Phillips        signs as appropriate.
                                      Street from Bell Street to the stormwater pond on the southern side of Lascelles        Consider need to relocate CFA facilities.
                                      Street. Flow over Bell Street is quite shallow.
                                      Depressions to the east of the railway line and those north of the water supply
                                      storages and Lascelles Street becoming progressively more inundated.
                                      Breakout developing from the weir pool near Lalor Street.
  85.93m      1.13m         N/A                                                                                               Refer to Appendix B and Appendix I.
                                      Breakout developing downstream of the weir pool near Gladstone Street.
  85.91m      1.12m         N/A                                                                                               Consider closing the Birchip-Rainbow Road.
                                      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            Close the Henty Highway if not already done.
                                      0.25m deep just south of the Phillips Street intersection.                              Erect “Water Over Road” signs on the Birchip-
                                      Water up to 0.25m across the Birchip–Rainbow Road a little east of town.                Rainbow Road.                                   5% AEP (20 year
  85.90m      1.11m      1,184ML/d
                                                                                                                              Advise that driving in water more than 300mm    ARI) event
                                      Depressions to the east of the railway line and those north of the water supply
                                      storages and Lascelles Street becoming progressively more inundated.                    deep is highly dangerous and may result in
                                                                                                                              loss of life.
                                      Inundation of farm land to the east of the Henty Highway.
  85.88m      1.09m         N/A                                                                                               Consider closing the Henty Highway.
                                      Break out developing from south of town to the east likely to affect the Henty          Erect “Water Over Road” signs on the Henty
  85.87m      1.08m         N/A
                                      Highway.                                                                                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
Yarriambiack Shire Council Flood Response Plan – Draft V4                                                     September 2009                                                      Page 32 of 72
                                                  APPENDIX A - FLOOD INTELLIGENCE

                                                                     YARRIAMBIACK CREEK at BEULAH
             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.
             Depth of                                         It is assumed that the Committee of Management will keep weirs free of debris
  Surface                  Creek
             Water at
 Elevation
              Gauge
                            Flow                                                                                                                                             Comments
 (m AHD)                   (ML/d)                     Consequence / Impact within the Municipality                                             Action6
               (m)
                                      flow does pond into the depression downstream of the GWMWater water supply            See flood inundation maps at Appendix I.     ARI) event
                                      storages and to the east of the Creek downstream of Lascelles Street.
                                                                                                                                                                         20% AEP (5 year
               N/A        795ML/d     Little damage likely.
                                                                                                                                                                         ARI) event
                                                                                                                            Erect “Road Closed” signs on low level and
               N/A          N/A
                                                                                                                            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).
                                                  YSC representative decides in conjunction with Chair of the YCAC that Creek monitoring should commence.
               N/A          N/A
                                             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 analyses 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.




Yarriambiack Shire Council Flood Response Plan – Draft V4                                                   September 2009                                                    Page 33 of 72
                                                  APPENDIX A - FLOOD INTELLIGENCE

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 1.5 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)




Yarriambiack Shire Council Flood Response Plan – Draft V4                                            September 2009                           Page 34 of 72
                                 APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

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.

                                                                                 WARRACKNABEAL
                                                                                         Depth of over floor
                                 Depth of flooding at property for selected           flooding at property for
   Location of House              flows/heights on the weir flood gauge.              selected flows/ heights                                       Comments
(Street Name & Number)                                                                on the weir flood gauge.
                               2.41m      2.67m      2.86m      2.90m      2.92m      2.67m     2.86m     2.90m
3 Alamein Avenue                                     0.13m      0.27m
4 Alamein Avenue                                     0.06m      0.23m
5 Alamein Avenue                                     0.16m      0.32m
6 Alamein Avenue                                     0.10m      0.28m
8 Alamein Avenue                                     0.11m      0.27m
10 Alamein Avenue                                    0.06m      0.24m
12 Alamein Avenue                                               0.23m
14 Alamein Avenue                                    0.22m      0.38m
1 Anderson Street                                               0.17m
2 Anderson Street                                               0.17m
3 Anderson Street                                    0.12m      0.27m


Yarriambiack Shire Council Flood Response Plan – Draft V4                                                  September 2009                                                      Page 35 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
4 Anderson Street                                           0.20m
5 Anderson Street                                 0.16m     0.31m
6 Anderson Street                                 0.20m     0.36m
7 Anderson Street                                 0.09m     0.24m
8 Anderson Street                                 0.22m     0.39m
9 Anderson Street                                           0.25m
11 Anderson Street                                          0.31m                               0.29m
12 Anderson Street                                0.11m     0.28m
14 Anderson Street                                0.13m     0.29m
15 Anderson Street                                          0.27m
17 Anderson Street                                          0.36m                               0.36m
18 Anderson Street                                          0.15m
19 Anderson Street                                          0.27m
20 Anderson Street                                          0.08m
21 Anderson Street                                          0.22m
28 Anderson Street                                          0.07m
26 Anderson Street                                0.12m     0.28m
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

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 36 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
9 Asquith Avenue                                  0.20m     0.32m
11 Asquith Avenue                                 0.13m     0.27m
13 Asquith Avenue                                           0.22m
15 Asquith Avenue                                           0.15m
1 Asquith Reserve Road                                      0.17m
2 Asquith Reserve Road                            0.22m     0.38m
4 Asquith Reserve Road                            0.34m     0.50m
6 Asquith Reserve Road                            0.20m     0.36m
8 Asquith Reserve Road                            0.18m     0.34m                               0.14m
10 Asquith Reserve Road                           0.08m     0.24m
12 Asquith Reserve Road                           0.18m     0.35m
14 Asquith Reserve Road                           0.24m     0.41m
18 Asquith Reserve Road                           0.23m     0.39m
20 Asquith Reserve Road                           0.10m     0.26m
22 Asquith Reserve Road                           0.04m     0.24m
28 Asquith Reserve Road                                     0.16m
1 Bowman Street                                   0.08m     0.23m
2 Bowman Street                                             0.42m                               0.22m
2 Bowman Street                                   0.06m     0.34m
2 Bowman Street                                             0.40m
3 Bowman Street                                   0.08m     0.21m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 37 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
3A Bowman Street                                            0.22m
4 Bowman Street                                   0.07m     0.35m
5 Bowman Street                                             0.21m
8 Bowman Street                                             0.53m                               0.01m
9 Bowman Street                                             0.34m
11 Bowman Street                                            0.57m                               0.08m
13 Bowman Street                                            0.64m                               0.23m
15 Bowman Street                                            0.73m                               0.12m
20 Bowman Street                                            0.33m
26 Bowman Street                                            0.40m
36 Bowman Street                                            0.41m
38 Bowman Street                                            0.31m
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
7 Cemetery Road                                             0.27m
9 Cemetery Road                                             0.44m
1 Clifford Street                                 0.13m     0.43m                               0.23m
3 Clifford Street                                           0.41m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 38 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
5 Clifford Street                                           0.44m
6 Clifford Street                                           0.30m
7 Clifford Street                                           0.47m
8 Clifford Street                                           0.25m
9 Clifford Street                                           0.37m
10 Clifford Street                                          0.18m
11 Clifford Street                                          0.36m
12 Clifford Street                                          0.18m
13 Clifford Street                                          0.38m
15 Clifford Street                                          0.33m
16 Clifford Street                                          0.17m
17 Clifford Street                                          0.33m
19 Clifford Street                                          0.32m
1 Coral Avenue                                              0.13m
2 Coral Avenue                                    0.35m     0.53m                               0.03m
4 Coral Avenue                                              0.52m                               0.16m
5 Coral Avenue                                    0.15m     0.31m
6 Coral Avenue                                              0.56m                               0.15m
7 Coral Avenue                                    0.10m     0.27m
8 Coral Avenue                                              0.53m                               0.06m
10 Coral Avenue                                   0.36m     0.52m                      0.30m    0.46m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 39 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
11 Coral Avenue                                   0.17m     0.32m
13 Coral Avenue                                   0.14m     0.27m
15 Coral Avenue                                   0.10m     0.24m
17 Coral Avenue                                   0.18m     0.32m
2 Craig Avenue                                              0.15m
4 Craig Avenue                                              0.11m
6 Craig Avenue                                              0.08m
8 Craig Avenue                                    0.17m     0.29m                               0.05m
30 Craig Avenue                                             0.05m
32 Craig Avenue                                             0.12m
36 Craig Avenue                                             0.05m
38 Craig Avenue                                             0.25m
40 Craig Avenue                                             0.34m
42 Craig Avenue                                             0.24m
44 Craig Avenue                                             0.33m                               0.13m
46 Craig Avenue                                   0.19m     0.40m                               0.14m
48 Craig Avenue                                   0.12m     0.32m
50 Craig Avenue                                   0.29m     0.48m
52 Craig Avenue                                   0.09m     0.24m                      0.01m    0.17m
54 Craig Avenue                                   0.34m     0.57m
56 Craig Avenue                                   0.39m     0.61m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 40 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
59 Craig Avenue                                             0.23m
60 Craig Avenue                                             0.24m
61 Craig Avenue                                   0.07m     0.24m
62 Craig Avenue                                   0.14m     0.31m
63 Craig Avenue                                   0.16m     0.32m
64 Craig Avenue                         0.06m     0.25m     0.41m                               0.02m
65 Craig Avenue                                   0.20m     0.35m                               0.04m
66 Craig Avenue                                   0.26m     0.41m                               0.07m
67 Craig Avenue                         0.09m     0.28m     0.43m                               0.05m
68 Craig Avenue                         0.18m     0.37m     0.51m                      0.05m    0.19m
70 Craig Avenue                         0.20m     0.39m     0.53m                               0.03m
72 Craig Avenue                         0.18m     0.37m     0.50m
74 Craig Avenue                         0.23m     0.42m     0.56m                               0.04m
76 Craig Avenue                         0.27m     0.45m     0.59m                      0.06m    0.20m
78 Craig Avenue                         0.34m     0.52m     0.66m                      0.12m    0.25m
80 Craig Avenue                         0.33m     0.51m     0.64m                      0.10m    0.23m
82 Craig Avenue                         0.32m     0.51m     0.64m                      0.15m    0.28m
84 Craig Avenue                         0.33m     0.51m     0.65m                               0.03m
86 Craig Avenue                         0.30m     0.48m     0.61m                      0.06m    0.19m
88 Craig Avenue                         0.26m     0.45m     0.58m                      0.07m    0.20m
90 Craig Avenue                         0.19m      0.37     0.50m                      0.07m    0.19m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 41 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
90A Craig Avenue                        0.19m     0.37m     0.50m                               0.09m
91 Craig Avenue                         0.14m     0.33m     0.47m                               0.08m
92 Craig Avenue                                   0.30m     0.43m
94 Craig Avenue                                   0.26m     0.39m
96 Craig Avenue                                   0.27m     0.40m
98 Craig Avenue                         0.06m     0.26m     0.39m
100 Craig Avenue                                  0.31m     0.43m
102 Craig Avenue                        0.15m     0.35m     0.47m                               0.09m
106 Craig Avenue                        0.44m     0.63m     0.75m             0.44m    0.63m    0.75m
108 Craig Avenue                        0.35m     0.55m     0.67m                               0.10m
110 Craig Avenue                        0.28m     0.48m     0.60m                               0.05m
112 Craig Avenue                        0.25m     0.45m     0.56m                               0.10m
114 Craig Avenue                        0.26m     0.46m     0.58m                               0.09m
116 Craig Avenue                        0.46m     0.66m     0.77m                      0.04m    0.15m
118 Craig Avenue                        0.35m     0.54m     0.66m                               0.10m
120 Craig Avenue                        0.08m     0.28m     0.39m                               0.10m
122 Craig Avenue                        0.26m     0.46m     0.57m                      0.13m    0.24m
124 Craig Avenue                        0.13m     0.32m     0.44m                      0.02m    0.13m
126 Craig Avenue                                  0.20m     0.31m                      0.03m    0.15m
130 Craig Avenue                        0.12m     0.32m     0.43m                      0.09m    0.21m
132 Craig Avenue                        0.23m     0.42m     0.54m             0.01m    0.20m    0.31m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 42 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
3 Devereux Street                                           0.50m                               0.13m
5 Devereux Street                                           0.38m                               0.14m
13 Devereux Street                                          0.35m
15 Devereux Street                                          0.23m
17 Devereux Street                                          0.32m
19 Devereux Street                                          0.20m
21 Devereux Street                                          0.17m
23 Devereux Street                                          0.15m
25 Devereux Street                                          0.14m
27 Devereux Street                                          0.10m
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
5 Elizabeth Avenue                                          0.18m
7 Elizabeth Avenue                                          0.20m
11 Elizabeth Avenue                                         0.18m
2 Fong Tong Avenue                                          0.08m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 43 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
3 Fong Tong Avenue                      0.03m     0.25m     0.41m
4 Fong Tong Avenue                                          0.23m
7 Gould Street                                              0.06m
8 Gould Street                                              0.15m
9 Gould Street                                              0.11m
12 Gould Street                                             0.38m
16 Gould Street                                             0.46m
18 Gould Street                                             0.08m
20 Gould Street                                             0.11m
22 Gould Street                                             0.11m
213 Henty Highway                                           0.39m
2 Jamouneau Street                                          0.06m
6 Jamouneau Street                                          0.23m
8 Jamouneau Street                                          0.22m
10 Jamouneau Street                                         0.11m
10A Jamouneau Street                                        0.14m
12 Jamouneau Street                                         0.18m
14 Jamouneau Street                                         0.09m
1 Jeparit Road                                              0.20m
1A Jeparit Road                                             0.27m
3 Jeparit Road                                              0.27m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 44 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
5 Jeparit Road                                              0.24m
7 Jeparit Road                                              0.16m
8 Jeparit Road                                    0.23m     0.34m
9 Jeparit Road                                              0.08m
21 Jeparit Road                                   0.12m     0.24m
31 Jeparit Road                                   0.60m     0.76m
33 Jeparit Road                                   1.07m     1.17m                      0.69m    0.79m
33 Jeparit Road                                   0.32m     0.50m
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
4 Kelsall Street                                            0.28m
5 Kelsall Street                                            0.15m
6 Kelsall Street                                            0.27m
7 Kelsall Street                                            0.14m
8 Kelsall Street                                            0.31m                               0.02m
8A Kelsall Street                                           0.32m                               0.01m
9 Kelsall Street                                            0.23m
11 Kelsall Street                                           0.38m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 45 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
12 Kelsall Street                                           0.32m
13 Kelsall Street                                           0.37m
16 Kelsall Street                                           0.38m
18 Kelsall Street                                           0.44m
20 Kelsall Street                                           0.68m
26 Kelsall Street                                           0.36m                               0.11m
28-30 Kelsall Street                                        0.41m
32 Kelsall Street                                           0.26m
36 Kelsall Street                                           0.41m
38 Kelsall Street                                           0.31m
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                                   0.19m     0.34m
2 Kokoda Avenue                                   0.22m     0.35m
2 Kokoda Avenue                         0.05m     0.24m     0.38m
3 Kokoda Avenue                         0.24m     0.43m     0.57m                               0.01m
4 Kokoda Avenue                                   0.19m     0.34m
5 Kokoda Avenue                         0.25m     0.43m     0.57m
6 Kokoda Avenue                                   0.27m     0.40m
7 Kokoda Avenue                         0.19m     0.38m     0.51m                      0.01m    0.14m
8 Kokoda Avenue                                   0.14m     0.27m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 46 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m     2.92m   2.67m    2.86m    2.90m
9 Kokoda Avenue                         0.17m     0.36m     0.49m                               0.02m
10 Kokoda Avenue                                  0.26m     0.39m
11 Kokoda Avenue                        0.15m     0.33m     0.47m
12 Kokoda Avenue                                  0.20m     0.33m
13 Kokoda Avenue                                  0.27m     0.40m
15 Kokoda Avenue                                  0.19m     0.32m
17 Kokoda Avenue                                  0.20m     0.32m
19 Kokoda Avenue                                  0.16m     0.29m
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
9 Lyle Street                                     0.31m     0.49m
10 Lyle Street                                    0.24m     0.40m
12 Lyle Street                                    0.22m     0.39m
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

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 47 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
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
9 Molyneaux Street                                          0.42m
9 Molyneaux Street                                          0.46m
10 Molyneaux Street                                         0.25m
11 Molyneaux Street                                         0.31m
12 Molyneaux Street                                         0.18m
14 Molyneaux Street                                         0.34m
16 Molyneaux Street                                         0.24m
1 Phillips Street                                           0.12m
2 Phillips Street                                           0.15m
13 Phillips Street                                          0.41m
20 Phillips Street                                          0.23m
2 to 6 Scott Street                                         0.03m
2 Symes Avenue                          0.25m     0.44m     0.57m
1 The Avenue                                      0.22m     0.40m
3 The Avenue                                      0.21m     0.37m
5 The Avenue                                      0.24m     0.41m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 48 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
7 The Avenue                                      0.19m     0.35m                               0.03m
9 The Avenue                                      0.31m     0.47m                               0.09m
11 The Avenue                                     0.30m     0.46m
13 The Avenue                                     0.21m     0.37m                      0.16m    0.32m
15 The Avenue                                     0.06m     0.23m
17 The Avenue                           0.07m     0.28m     0.45m                      0.01m    0.18m
19 The Avenue                                     0.05m     0.21m
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
3 Warunda Avenue                        0.43m     0.65m     0.81m                      0.12m    0.28m
5 Warunda Avenue                                  0.15m     0.32m
5 Warunda Avenue                        0.54m     0.76m     0.92m                      0.13m    0.29m
7 Warunda Avenue                        0.58m     0.80m     0.96m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 49 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
9 Warunda Avenue                        0.60m     0.82m     0.99m                               0.01m
11 Warunda Avenue                       0.26m     0.48m     0.65m
13 Warunda Avenue                       0.24m     0.46m     0.62m
17 Warunda Avenue                                 0.28m     0.44m                      0.26m    0.42m
1 Watson Street                                             0.09m
3 Watson Street                                             0.15m
4 Watson Street                                             0.07m
5 Watson Street                                             0.16m
6 Watson Street                                             0.05m
7 Watson Street                                             0.19m
8 Watson Street                                             0.09m
9 Watson Street                                             0.16m
10 Watson Street                                            0.03m
11 Watson Street                                            0.17m
12 Watson Street                                            0.04m
14 Watson Street                                            0.03m
18 Watson Street                                            0.05m
20 Watson Street                                            0.10m
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

Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 50 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                            WARRACKNABEAL
                                                                                 Depth of over floor
                               Depth of flooding at property for selected     flooding at property for
   Location of House            flows/heights on the weir flood gauge.        selected flows/ heights            Comments
(Street Name & Number)                                                        on the weir flood gauge.
                             2.41m      2.67m     2.86m     2.90m   2.92m     2.67m    2.86m    2.90m
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
4 Woolcock Street                                 0.17m     0.33m
5 Woolcock Street                                 0.09m     0.25m
6 Woolcock Street                                           0.28m
7 Woolcock Street                                           0.16m
8 Woolcock Street                                           0.17m
9 Woolcock Street                                 0.17m     0.33m
10 Woolcock Street                                          0.06m
14 Woolcock Street                                          0.06m
16 Woolcock Street                                          0.03m




Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009              Page 51 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                              BEULAH
                                                                                Depth of over floor
                                Depth of flooding at property for selected   flooding at property for
   Location of House          levels on the Rainbow Road (Beulah) gauge.      selected levels on the                   Comments
(Street Name & Number)                                                        Rainbow Road gauge.
                             1.07m      1.11m     1.15m     1.20m   1.21m    1.15m   1.20m     1.21m
11 Bell Street                                              0.15m
13 Bell Street                0.66m     0.79m     0.94m     1.03m
15 Bell Street                                              0.27m
19 Bell Street                                    0.39m     0.47m
21 Bell Street                                    0.50m     0.58m
23 Bell Street                                              0.12m
25 Bell Street                                    0.40m     0.48m
27 Bell Street                                    0.05m     0.11m
36 Bell Street                                    0.15m     0.21m
38 Bell Street                                    0.28m     0.33m
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
42 Deakin Street                                            0.15m
44 Deakin Street                                            0.22m
46 Deakin Street                                  0.12m     0.20m
50 Deakin Street                                  0.09m     0.18m
52 Deakin Street                                  0.30m     0.39m
Deakin Street (Footy Shed)              0.12m     0.27m     0.35m                                       Footy Shed

Yarriambiack Shire Council Flood Response Plan – Draft V4                                      September 2009                     Page 52 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                              BEULAH
                                                                                Depth of over floor
                                Depth of flooding at property for selected   flooding at property for
   Location of House          levels on the Rainbow Road (Beulah) gauge.      selected levels on the                           Comments
(Street Name & Number)                                                        Rainbow Road gauge.
                             1.07m      1.11m     1.15m     1.20m   1.21m    1.15m   1.20m     1.21m
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
23 Gladstone Street                               0.26m     0.33m
25 Gladstone Street                               0.15m     0.23m
26 Gladstone Street                               0.12m     0.21m
27 Gladstone Street                               0.23m     0.32m
29 Gladstone Street                               0.21m     0.30m
30 Gladstone Street                                         0.10m
31 Gladstone Street                               0.20m     0.29m
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
74 Phillips Street                                0.37m     0.45m

Yarriambiack Shire Council Flood Response Plan – Draft V4                                      September 2009                             Page 53 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED

                                                                               BEULAH
                                                                                 Depth of over floor
                                 Depth of flooding at property for selected   flooding at property for
   Location of House           levels on the Rainbow Road (Beulah) gauge.      selected levels on the                 Comments
(Street Name & Number)                                                         Rainbow Road gauge.
                               1.07m    1.11m     1.15m     1.20m    1.21m    1.15m   1.20m     1.21m
76 Phillips Street                                0.31m     0.39m
82 Phillips Street                                0.19m     0.28m
84 Phillips Street                                          0.14m
85 Phillips Street                                          0.21m
Phillips Street (Bowls Club)            0.24m     0.40m     0.48m                                        Bowls Club




Yarriambiack Shire Council Flood Response Plan – Draft V4                                       September 2009                   Page 54 of 72
                               APPENDIX B – PROPERTIES LIKELY TO BE FLOODED


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




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




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




Yarriambiack Shire Council Flood Response Plan – Draft V4                                     September 2009                                            Page 55 of 72
                         APPENDIX C – FLOOD HISTORY

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 analyses 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              Walmer *
                                                                                      Comments
                     415201                 415200

                                                             Widespread flooding along the Wimmera River and Dunmunkle
                                                             and Yarriambiack Creeks. Townships of Horsham, Glenorchy,
                                         3.86m gauge
                                                             Warracknabeal, Dimboola, Jeparit and Rupanyup affected.
  Aug. 1909         No records          42,400 ML/day
                                                             Estimated peak flow at the Railway Bridge on Yarriambiack
                                          0.5% AEP
                                                             Creek (1.5km downstream of the Wimmera Highway) =
                                                             13,000ML/d d (150m3/s).
                                         3.69m gauge         Major flood along Wimmera River and Yarriambiack Creek.
  Sept 1915         No records          29,100 ML/day        Townships of Horsham, Glenorchy Warracknabeal, Dimboola &
                                          2.7% AEP           Jeparit affected.
   July 1974                                                 Flooding along Dunmunkle Creek
                                                             Significant flooding along Wimmera River & Yarriambiack Creek.
                    4.85m gauge          3.63m gauge         Horsham, Warracknabeal, Dimboola & Jeparit may have been
   Aug 1981        17,200 ML/day        24,800 ML/day        affected to some degree.
                      14% AEP             4.7% AEP           Flow at Wimmera Highway Bridge = 1,715ML/d.
                                                             Flow at Beulah Weir = 1,180ML/d (13.6m3/s).
                    4.86m gauge          3.77m gauge         Flow at Wimmera Highway Bridge = 1,712ML/d.
  Sept 1983        17,700 ML/day        35,000 ML/day        Flow at Warracknabeal Weir = 1,114ML/d (12.9m3/s).
                      13% AEP             1.3% AEP           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.




Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                         Page 56 of 72
                          APPENDIX C – FLOOD HISTORY

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 6 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 August 27th that ‘No
damage will result in this township’.
Along Dunmunkle Creek, the August 1909 event was also a major flood. At Rupanyup on the 21st 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 12th July 1974.

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




Yarriambiack Shire Council Flood Response Plan – Draft V4               September 2009                        Page 57 of 72
APPENDIX D – GUIDELINES FOR FLOOD MONITORING
             AND WEIR OPERATION
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 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
                         Fax:       5398 2502)
                         email:     jmagee@yarriambiack.vic.gov.au
                         Phone:     0429 954 042


Yarriambiack Shire Council Flood Response Plan – Draft V4               September 2009                        Page 58 of 72
    APPENDIX D – GUIDELINES FOR FLOOD MONITORING AND WEIR OPERATION

Yarriambiack Creek Flood Monitoring Group - Contact Details
Name                  Group                                   Address                Phone               Facsimile   Mobile         Email
                                                              PO Box 243,
                                                              Warracknabeal(w)       5398 0102(w)                                   jmagee@yarriambiack.vic.gov.au
James Magee           Yarriambiack Shire                                                                 5398 2502   0429 954 042
                                                              46 Austin Street,      5083 3512(h)
                                                              Hopetoun (h)
                                                              PO Box 10,             5390 4212(w)
David McKenzie        Redda’s Park Committee Management                                                              0427 909 205
                                                              Brim                   5390 9205(h)
                                                              41 Evelyn Street,
Doug Hallam           Yarriambiack Creek Advisory Committee                          5083 3180           5083 3180
                                                               Hopetoun
                                                              RMB 245,                                                              km@netconnect.com.au
Kevin Munro           Beulah Weir Pool Committee                                     5390 213            5390 2205   0429 902 213
                                                              Beulah
                                                              13 Phillips Street,
Gus Shannon           Beulah Weir Pool Committee                                     5390 2375           5390 2485   0427 902 375
                                                              Beulah
                                                              RMB 640,
Max Golder            Redda’s Park Committee Management                              5390 0206           5390 0244   0487 900 206
                                                              Brim
                                                              RMB 615,                                                              nagpl@netconnect.com.au
James McFarlane       Yarriambiack Creek Advisory Committee                          5390 4251           5390 4364   0427 535 147
                                                               Brim
                                                              84 Phillips Street,    5390 2363
Maurice Williams      Beulah Creek Management Committee                                                  5390 2496
                                                              Beulah                 5390 2327
                                                              PO Box 38,
George Armstrong      Yarriambiack Creek Advisory Committee                          5383 4558           5383 4558
                                                              Murtoa
                                                              PO Box 2,
Trevor Robinson                                                                      5398 2942           5398 2487   0419 505 693
                                                              Warracknabeal
                                                              17 McKenzie Street,
Don Cook                                                                             5390 2362                       0429 996 819   kardel@bigpond.com
                                                              Beulah
                                                              73 Evelyn Street,
Bert Hallam                                                                          5083 3236                       0417 012 003
                                                              Hopetoun
                                                              826 Greenhills Road,
Frank Baker                                                                          5384 7370
                                                              Jung
                                                              2503 Wimmera Hwy,
Gavin Whyte                                                                          5384 7381                       0427 314 731
                                                              Jung
                                                              2860 Wimmera Hwy
Gavin Puls                                                                           5384 7332           5384 7311   0417 018 648
                                                              Jung



Yarriambiack Shire Council Flood Response Plan – Draft V4                                    September 2009                                           Page 59 of 72
     APPENDIX D – GUIDELINES FOR FLOOD MONITORING AND WEIR OPERATION

Industry Contacts
Name                        Group                                    Address                             Phone          Facsimile   Mobile
                                                                     PO Box 243, Warracknabeal(w)        5398 0102(w)
James Magee                 Yarriambiack Shire Council                                                                  5398 2502   0429 954 042
                                                                     46 Austin Street, Hopetoun (h)      5083 3512(h)
Brian Poulton               Yarriambiack Shire Council               PO Box 243, Warracknabeal           5398 0119      5398 2502   0427 348 501
Chris Lehmann               Yarriambiack Shire Council               PO Box 243, Warracknabeal           5083 3167      5083 3253   0428 557 301
Peter Jess                  Yarriambiack Shire Council               PO Box 243, Warracknabeal           5398 1353      5394 1844   0428 373 017
Bernie Naylor               Yarriambiack Shire Council               PO Box 243, Warracknabeal           5398 0105      5398 2502   0418 519 623
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 Shire Council Flood Response Plan – Draft V4                               September 2009                                        Page 60 of 72
       APPENDIX D – GUIDELINES FOR FLOOD MONITORING AND WEIR OPERATION

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

                                              Flow Capacity   Detailed description of gauge location             Reader               Alternate reader
Gauge                   Name
                                               of Structure      (refer to map on following page)         name & contact details   (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
          Upstream of outlet from the
   5                                             3,600ML/d
          Warracknabeal Weir Pool
   6      Lah West Road at Lah                      N/A
   7      Brim Weir Pool Inlet Regulator          580ML/d
          Brim Weir Pool Outlet Regulator           750 -
   8
          (Brim West Road)                       1,300ML/d
   9      Galaquil West Road at Galaquil          500ML/d
          Upstream side of the Birchip-
  10
          Rainbow Road culverts at Beulah
  11      Henty Highway at Hopetoun
          Between Lake Corrong and Lake
  12
          Lascelles at Hopetoun




Yarriambiack Shire Council Flood Response Plan – Draft V4                                September 2009                                    Page 61 of 72
       APPENDIX D – GUIDELINES FOR FLOOD MONITORING AND WEIR OPERATION


  ATTENTION: FLOOD MONITORING OFFICER – YARRIAMBIACK SHIRE COUNCIL
                             YA R R I A M B I A C K C RE E K FL O O D M O N I TO 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.




  Yarriambiack Shire Council Flood Response Plan – Draft V4                              September 2009                                 Page 62 of 72
     APPENDIX D – GUIDELINES FOR FLOOD MONITORING
                  AND WEIR OPERATION

           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: ________________________

                                                                  Level
Gauge                  Description                 Level                        Flood Status        Flow Condition
                                                                 (m AHD)

1         Yarriambiack Creek at Off-take

2         Wimmera Highway Bridge - Jung

3         Henty Highway at Kellalac

4            Ailsa Road at Kellalac

          Outlet of Warracknabeal Weir Pool
5
          at Warracknabeal

6         Lah West Road at Lah

7         Brim Weir Pool Inlet Regulator

          Brim Weir Pool outlet Regulator
8
          (Brim West Road)

9         Galaquil West Road at Galaquil

10        Birchip-Rainbow Road at Beulah

11        Henty Highway at Hopetoun

          Between Lake Corrong & Lake
12
          Lascelles, Hopetoun


     Flood Monitoring Instructions:



     Flood Warning Advice:



     Flood Management Instructions:

     Beulah:

     Brim:

     Warracknabeal:


     Signed: __________________________________________
     Yarriambiack Shire Council Flood Response Plan – Draft V4         September 2009                  Page 63 of 72
                  APPENDIX E – FLOOD CLASS LEVELS


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 1st 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).




Yarriambiack Shire Council Flood Response Plan – Draft V4               September 2009                       Page 64 of 72
          APPENDIX F – SERVICE LEVEL AGREEMENT

 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.




Yarriambiack Shire Council Flood Response Plan – Draft V4         September 2009                     Page 65 of 72
           APPENDIX G – INFORMATION FLOW CHART

Not Available from CMA at this stage




Yarriambiack Shire Council Flood Response Plan – Draft V4   September 2009   Page 66 of 72
       APPENDIX H – WARNING DISSEMINATION LIST

  Agencies, organisations or entities            Provided by                    Delivery method




Yarriambiack Shire Council Flood Response Plan – Draft V4      September 2009                     Page 67 of 72
                                      APPENDIX I – MAPS

1. Catchment Map
??? Include a map showing Yarriambiack and Dunmunkle creeks and their relationship to the Wimmera River as well as
the location of all weirs along Yarriambiack Creek together with the name and location of all rain and river gauge sites.
(BoM 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 and
on the CD located at the back of this Plan.

                             No.                           Drawings for Beulah

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

                              2        20 year Average Recurrence Interval Flood Event
                                       Flood Extents and Depths at Beulah (1 sheet)

                              3        50 year Average Recurrence Interval Flood Event
                                       Flood Extents and Depths at Beulah (1 sheet)

                              4        100 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)

                              6        20 year Average Recurrence Interval Flood Event
                                       Flood Extents and Depths at Warracknabeal (1 sheet)

                              7        50 year Average Recurrence Interval Flood Event
                                       Flood Extents and Depths at Warracknabeal (1 sheet)

                              8        100 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 (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). ??

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

Yarriambiack Shire Council Flood Response Plan – Draft V4                September 2009                    Page 68 of 72
                                      APPENDIX I – MAPS

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

Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                       Page 69 of 72
                                      APPENDIX I – MAPS

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.




Yarriambiack Shire Council Flood Response Plan – Draft V4             September 2009                       Page 70 of 72
Yarriambiack Shire Council Flood Response Plan – Draft V4   September 2009   Page 71 of 72
                                         - REFERENCES -

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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