Contact Us


Wimmera CMA

Street Address:
24 Darlot Street, Horsham, 3400
(enter via Gleed St)

Postal Address:
PO Box 479, Horsham, VIC, 3402
Phone: (03) 5382 1544
Fax: (03) 5382 6076
Office Hours:
Monday to Friday, 8:30 - 5:00pm
(excluding Public Holidays and Christmas - New Year Closure.  Office may also be closed for short periods Monday mornings)

Flood Investigations and Flood Extent Maps

Flood investigations involve a detailed technical analysis of historic information to determine future flooding possibilities and their impacts. Community participation and ground-truthing are essential parts of investigations.

 Flow Gauge Board on Wimmera RiverFlow Gauge Board on Wimmera River

A flood investigation will determine the impacts of various flood intensities and often looks at possible options to reduce expected damages.

Dependent upon funding, an investigation may also help to determine actions to be taken by emergency service agencies during times of flooding, and often recommends flood-warning systems to improve community awareness to risks posed. Once a flood investigation is completed Wimmera CMA works closely with local government to amend planning schemes so that learnings from the investigation are incorporated and planning development is managed to the appropriate flooding risks identified.

Flow Modelling Study

Wimmera CMA has also completed a flow modelling study of the Wimmera River and Yarriambiack Creek between Glenorchy, Horsham, and Warracknabeal. The study undertook hydrologic and hydraulic modelling of the waterways; it was completed in September 2009. The study assessed both current and 'pre-European' catchment-waterway-floodplain regimes.

Flood and Flow Investigation Reports

The following flood and flow investigations have been completed:

Flood and Flow Extent Maps

AEP (Annual Exceedance Probability) Flood and Flow Event Extent Maps
Note: Wimmera CMA is not the lead agency to contact during a flood event.
You can find further information from: 

Please note that these maps are a lower resolution to enable quicker downloading. 
Find high resolution maps here.

Flood Map Locations

year event

year event

year event

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year event

year event

AEP Flood and Flow Events

Beulah 2006 10% 5% 2% 1% 0.5%
Concongella 2015  20% 10%   5% 2%   1% 0.05% 
Dimboola 2006 20% 10% 5% 2% 1% 0.5%
Dunmunkle 2016 - Boolite, Murtoa
and Upper Dunmunkle Creek
Glenorchy 2006 20% 10% 5% 2% 1% 0.5%
Halls Gap 2017 20% 10% 5% 2% 1% 0.5%
Horsham 2002 20% 5% 2% 1%  0.5%
Jeparit 2008 20% 10% 5% 2% 1% 0.5%
Jeparit 2008 - no levee 20% 10% 5% 2% 1%  0.5%
Lower Wimmera 2016 - downstream
of Horsham 
20% 10% 5% 2% 1%  0.5%
Mount William Creek 2014 20% 10%  5% 2% 1%  0.5%
Natimuk 2013 20% 10% 5%  2% 1% 0.5%
Upper Wimmera 2014 20% 10% 5%  2% 1% 0.5%
Wimmera River & Yarriambiack Creek
2009 (inc. Horsham)
20% 10% 5% 2% 1% 0.5%
Yarriambiack Creek 2016 - Brim 20% 10% 5% 2% 1% 0.5%
Yarriambiack Creek 2016 -
20% 10% 5% 2% 1% 0.5%
Yarriambiack Creek 2016 - Jung
20% 10% 5% 2% 1% 0.5%

PLEASE NOTE: Maps are provided for general community information purposes only.
Flood levels and floor levels are determined from information available at a particular time and actual levels may exceed those shown. For information about flood conditions and restrictions affecting a particular property, contact Wimmera CMA or the relevant council. Neither Wimmera CMA nor the State of Victoria claim or warrant that the information in this map is accurate, complete or up to date, and neither Wimmera CMA nor the State shall be responsible or liable in respect of any use of or reliance placed on it by any person.

Flood Warning Network

Wimmera CMA has worked with emergency response agencies and the community to develop the Wimmera Flood Warning Network. The network consists of radio-telemetry equipment at existing river and rain gauges throughout the Wimmera, linked to the Bureau of Meteorology (BoM) and Wimmera CMA offices.  The information is then fed into computer based models that are used to predict the likelihood of flooding that may occur, the extent of the flooding and the timing so as to provide information to emergency services and the community through early warning messages.

The system is under constant review, with all flood investigations considering opportunities for network improvement.

You can find real-time information from these gauges on the BoM website.

Flood Project Updates

Horsham Wartook Flood Investigation Maps

Dec 23, 2017

Comments are now closed

The community meetings are all wrapped up, but it's not too late to have your say on the draft Horsham Wartook Flood Investigation maps.

View the draft flood maps at

You can see the full draft flood extent, zoom in to see finer details and also mark the map with your comments.

So check it out and provide us with your feedback.  It will help shape the final flood extent.

MacKenzie Falls 2011 MacKenzie Falls during the Jan 2011 flood
(source: GWMWater)
Flooding north east of Horsham 2011 Flooding north east of Horsham on
January 18, 2011 caused extensive
damage to property
Bungalally Ck into MacKenzie River Bungalally Creek flowing into
MacKenzie River at Mackleys Road
during September 2016 floods

An international flood warning specialist is examining the effectiveness of emergency warnings during Wimmera floods as part of a Horsham and Wartook Valley Flood Investigation.

Neil Dufty from Sydney-based natural hazard, ecological and environmental company Molino Stewart will speak at community meetings this month in Laharum, Wonwondah and Horsham.

Mr Dufty is the Regional Director of The International Emergency Management Society (TIEMS) for Australia, New Zealand and Oceania and a member of the International Advisory Board of the Centre for Floods, Communities and Resilience at the University of Western England.

He has more than 35 years’ experience in environmental education and management and has worked specifically in developing disaster plans for schools, communities, government agencies and businesses.

The first meeting is at Laharum Community Hall on Tuesday November 28. Another meeting is at the Wonwondah Community Hall on Wednesday November 29, then at Horsham Golf Club on Thursday November 30. All meetings are from 7.30 to 9pm.

Meeting organisers are seeking community feedback on new flood maps and potential mitigation options for the MacKenzie River, Burnt and Bungalally Creeks and other waterways south of Horsham.

The flood extent maps for the Horsham and Wartook Valley Flood Investigation are a result of 12 months of analysis of community flood knowledge including learnings from the January 2011 and September 2016 floods.

The investigation is also more accurately mapping the impact of stormwater in Horsham during January 2011 and September 2016.

Wimmera CMA chief executive David Brennan said it was exciting to reach this stage. He said they were keen for the community to review the maps and compare them with their own observations. 

“We are seeking community input on mitigation options to reduce flood impacts for the 121,500-hectare study area.

“Following the first round of meetings last year we received lots of valuable information in terms of flooding extents, depth and timing. This is a good chance for the community to ask questions and comment upon the new mapping.”

Mr Brennan reiterated that local flood information and validation was invaluable to flood investigations.

“The more information we receive the more confidence we have in the final products the flood investigation produces,” he said.

The investigation will inform flood response agencies and enable better protection and improved preparedness for future flood events. 

Results will also form part of Local Government planning schemes, giving the community and councils a better indication of likely flood impacts on future building developments. 

“All this information will help emergency services, Local Government and other agencies prioritise future work helping to improve emergency planning for future flood events,” Mr Brennan said.

Community Meetings starting from 7:30

  1. Laharum Community Hall on Tuesday November 28
  2. Wonwondah Community Hall on Wednesday November 29
  3. Horsham Golf Club on Thursday November 30