24 Darlot Street, Horsham, 3400
(enter via Gleed St)
PO Box 479, Horsham, VIC, 3402
Phone: (03) 5382 1544
Fax: (03) 5382 6076
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 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.
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.
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.
The following flood and flow investigations have been completed:
Please note that these maps are a lower resolution to enable quicker downloading. High resolution 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:
Flood Map Locations
AEP Flood and Flow Events
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.
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.
Since the late 1990s Dock Lake near Horsham has been a silent, dry, grassy paddock.
But after a wet winter and a wet start to spring, a noisy chorus of frogs and waterbirds are heralding the arrival of water at this 215 hectare wetland downstream of Green Lake.
Wimmera CMA chief executive Dave Brennan said with Lake Wartook, Taylor’s Lake and Green Lake all full, water was being diverted into Dock Lake to prevent floodwaters inundating farm land.
He said it was only a small trickle and he didn’t envisage the lake filling. Wetland birds, frogs, insects and vegetation would be the main beneficiaries of this bonus water.
“We are already seeing environmental benefits and will be monitoring the changes the water will bring,” he said. “If there is additional spring rain we will see more water go into the lake but for now there’s just a small amount.”
Last year Wimmera CMA undertook a study into Dock Lake which looked at its history and the environment. The study identified it as having a high environmental value wetland for native vegetation and waterbirds when it contains water.
Local resident Russell Peucker said Dock Lake used to provide valuable bird habitat and was considered one of the best wetlands and bird sanctuaries in the Wimmera.
Historically, Dock Lake was a natural wetland that would fill and dry based on natural inflows before it became part of the Wimmera Mallee headworks system. With water storage changes as a result of the Wimmera Mallee Pipeline, Dock Lake was removed from the headworks system in 2010.
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