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Floods

Community warnings during floods

Victoria State Emergency Service (VICSES) is the control agency for flood, storm, tsunami and earthquake in Victoria, and is the responsible Authority for issuing emergency information and warnings to communities. For more information visit the 

Detailed information from VICSES regarding regarding flood warnings and any community notifications can be found on the  VicEmergency website emergency.vic.gov.au

Southern Rural Water has approval from VICSES to provide updates about releases from our storages, while VICSES remains responsible for issuing community warnings and managing flood information.

High flow figures from SRW storages

When website and social media updates will start

High flow release figures from our storages will be available when:

    • releases at Lake Glenmaggie are more than 3,500 ML/day
    • the Thomson River upstream of Cowwarr Weir reaches more than 3,500 ML/day
    • outflows at Lake Narracan and Blue Rock Lake are above 6,000 ML/day

Stay in touch with what’s happening via our Twitter and Facebook pages, which are updated regularly when the above triggers have been reached.

You can also join our SRW Eastern Storages Updates Facebook group to make sure you never miss one of our posts regarding our storages at Lake Glenmaggie, Cowwarr Weir, Lake Narracan and Blue Rock Lake. We'll post there regularly during high-outflow events.

Lake Glenmaggie – No current High Flows

Lake Glenmaggie - 10am update 4 December (Last update)

Calculated inflows into Lake Glenmaggie: 13,824 ML/day (falling)

Total capacity: 177,640ML

Current storage level:  177,640ML  (rising)

Total releases: 1,200ML/day (falling)

Notes:  This will be the last update. We will start these updates again if releases above 3,500ML per day.

For more information on Macalister River flood warnings visit the Bureau of Meteorology website. Updated community information and any alerts are available on emergency.vic.gov.au 

Minor Flood Warning: 7,500ML Moderate Flood Warning: 22,000ML Major Flood Warning: 35,000ML

To get regular notifications on our storages, please join our Facebook group https://www.facebook.com/groups/srweasternstorages/

Cowwarr Weir – No Current High Flows

Thomson River at Coopers Creek

Megalitres  per day:
Trend:

Thomson River Upstream of Cowwarr Weir

Megalitres  per day:
Trend:

Next Update:
Notes:

When flow reaches 8,000 ML/per day upstream of Cowwarr Weir and is expected to rise, access to the low level bridge at Cowwarr Weir cannot be guaranteed.

Please visit the Bureau of Meteorology website for current flood warnings downstream on the Thomson River.

The official flood warning levels for the Thomson River at Wandocka, downstream of Cowwarr Weir, are:
Minor Flood Warning 9,200ML
Moderate Flood Warning 15,100ML
Major Flood Warning 24,300ML
Blue Rock Lake – No Current High Flows

Total Capacity : 208,000ML
Current storage level:

Calculated inflows into Blue Rock Lake:
Total releases – at this time on the Tanjil River down stream of Blue Rock Lake:

Next update:
Notes:

For more information on the Latrobe River flood warnings visit the Bureau of Meteorology website.

Official Flood Warnings – Tanjil River at Tanjil South

Minor Flood Warning: 7,500
Moderate Flood Warning: 11,700ML
Major Flood Warning: 18,500ML

Lake Narracan – No Current High Flows

Total capacity: 7,230 ML

Current storage volume:

Calculated Latrobe River flows at Thoms Bridge:

Calculated inflows into Lake Narracan: 

Total outflows- at this time on the Latrobe River down stream of Lake Narracan: 

Next update:

Notes: For more information on the Latrobe River flood warnings visit the Bureau of Meteorology website.

Official Flood Warnings on the Latrobe River at Thoms Bridge

Minor Flood Warning: 8,500ML Moderate Flood Warning: 11,900ML Major Flood Warning:

Lake Glenmaggie catchment comparison
Floods FAQs

What is a one in 100 year flood?
A one in 100-year flood is a flood that has a 1 in 100 or 1% chance of occurring in each and every year.

In a 70 year lifetime there is a 50/50 chance of a 1 in 100 flood being exceeded at any location.

Can you have two 100-year floods in one year?
Yes, two 100-year floods can occur one after the other.

Who is in charge of responding to the floods?
The Victoria State Emergency Service (VICSES) is the control agency for flood response works in partnership with support agencies such as DEPI to manage responses to flooding.

How does Victoria’s flood warning system work?
Flood warning information is acquired through the Victorian streamflow gauging network.
The network has 750 gauging sites that serve a range of purposes, including 283 that are used as primary flood warnings sites.

Other sites are used to provide further back up information and flash flooding information. Data collected is immediately made available to those organisations that require it.

Who develops flood maps?
Melbourne Water and Catchment Management Authorities develop flood maps for areas at risk.
These maps are used for both land planning and by the SES to provide flood information during flood emergencies.

Flood maps have been completed across the state for the 1 in 100-year flood. In a number of key areas across the state, this is supplemented by additional information on flood extent and height for a range of flood sizes.

What is a levee?
A levee is a natural or man-made mound or wall to confine floodwaters.
Levees can reduce the risk of flooding for adjacent properties, but no levee can eliminate all flood risk.
Levees can also increase the risk of flooding downstream through the loss of natural floodplain storage or increase flooding to unprotected area.

Who is responsible for maintaining levees?

  • Private landowners are responsible for maintaining levees on their land. They may be required to obtain a planning permit to undertake works from their local Council.
  • Local councils and/or Melbourne Water are responsible for maintaining levees which protect urban communities.
  • There are a smaller number of levees on public land built many decades ago which have no clear ownership responsibility.

Why don’t water corporations hold back more water during flooding events to protect downstream communities?
Most water corporation dams were built to capture sufficient water to meet the supply needs of the community.
They have very little additional capacity to mitigate the impacts of flood events on developments located on flood plains.

In extreme floods, dams simply cannot hold back the massive volumes of water that flow into a reservoir over a short period of time. Dams must spill water once the capacity of the reservoir is reached and allow the water to continue its passage through the water courses and across the floodplains.

Dam spillways are designed, however, to allow extreme floods to pass through the reservoir without compromising the dam structure itself, thereby reducing the impact on downstream communities.

Who is responsible for dam safety?
Under Victorian legislation dam operators and owners are responsible for dam safety.

The Minister for Water maintains sufficient oversight of dam safety to ensure responsibilities are being met and to intervene where required.

What would cause a dam to fail?
Dams can fail if water flows over the dam wall during high rainfall or floods.

This is because the capacity of the spillway is not able to pass the flows safely.
Also, where construction and materials are inadequate, dams can fail due to piping and erosion and subsequent water flow through the embankment or foundation of the dam.

Does vegetation in and around streams have an impact on flooding?
In major floods, such as January 2011 , flood height is controlled primarily by the intensity and amount of rainfall, not vegetation.

Vegetation along riverbanks can have a beneficial effect on flooding in lowland areas as it slows the rate of water movement.

However, in large floods, the main control on local flood level will be through constrictions that choke the flow down. These are usually road embankments, or bridge openings. Such constrictions are much more important than the local effect of vegetation.

How safe is floodwater?
Floodwater can contain contaminants like animal waste, agricultural chemicals and petrol. Avoid swimming in floodwaters, swollen creeks, rivers and other tributaries at all times.

If you are unsure whether it is safe to swim in a river that has been affected by floodwaters, seek advice from the local council.

Is my water ok to drink?
Floodwater can contain contaminants like animal waste, agricultural chemicals and petrol.

For those members of the community who are on a town supply of drinking water, the relevant water corporation will advise its customers if the tap water is unsafe to drink, use for cooking, cleaning or bathing via local media and their websites.

For those members of the community on private water supplies (tanks, bore water), advice on managing these supplies post flood is contained in the Department of Health’s flood recovery packs which are available at relief and recovery centres and on the DHS website.

What about water for stock?
Floodwater can contain contaminants like animal waste, agricultural chemicals and petrol and may be dangerous to stock.

Advice on managing these supplies post flood is contained in the Department of Health’s flood recovery packs which are available at relief and recovery centres and on the DHS website.

Flood history at Glenmaggie

Flood history at Glenmaggie

Below shows a comparison of flows into Glenmaggie and flows out of Glenmaggie for the ten highest floods on record.

Glenmaggie – ten largest floods (ranked on outflows)

June 2007

Peak inflow – 250,000 to 300,000
Peak outflow – 147,600

1971

Peak inflow – 123,000
Peak outflow – 110,600

1978

Peak inflow –102,000
Peak outflow – 88,900

1952

Peak inflow –108,000
Peak outflow – 88,100

1935

Peak inflow – 83,200
Peak outflow – 77,000

1993

Peak inflow – 69,700
Peak outflow – 75,500

1995

Peak inflow – 62,600
Peak outflow – 66,500

1950

Peak inflow – 91,000
Peak outflow – 62,400

Nov 2007

Peak inflow – 69,000
Peak outflow – 59,000

2012

Peak inflow – 93,700
Peak outflow – 58,000

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WaterMatch - online trading

Watermatch is a free online service, designed to help people trade water.

Once you have registered, you can advertise to buy or sell water.

Depending on the water that you wish to trade, choose from the Groundwater, Surface Water (rivers and creeks) and Irrigation District forum.

Select a new topic to create your ad. Your ad can be to buy or sell water, and must describe the source of your water, quantity of water you want to buy or sell, how long you want to trade for and your contact details. If you are happy to put a buying or selling price, this can be included here too.

If you want to respond to an ad, you can use the email link or contact the advertiser direct.

It is an online trading forum, and can also be used by people who are not on the internet, with help from our staff.

Watermatch allows you to register your interest in either buying or selling water in southern Victoria.

  • the Macalister, Werribee and Bacchus Marsh Irrigation District
  • Groundwater systems in southern Victoria
  • Rivers and creek systems in southern Victoria (other than those managed by Melbourne Water around the Port Phillip region).

Who can use it?
Anyone can use watermatch. You may be an existing licence holder who wants to sell water, or buy more water.

You may not currently have a licence, but you want to buy water in the region.

How does it work?

  • click here to enter Watermatch
  • register as a user (a very simple process)
  • go to the system or district you are interested in and check current entries
  • add in any entry for any water you want to sell or buy

What information should I include in my ad?

  • If you are wanting to buy or sell
  • your name
  • phone number
  • name of river, creek, groundwater management area or irrigation district
  • how much water is to be traded
  • If the trade is temporary or permanent
  • term of the trade (Maximum term is 5 years)

Things you need to know
We are always looking for ways to improve our customer service. If you would like to provide feedack or suggested improvements please click here.

it's important to note that Southern Rural Water is not acting, and will not act, as a water broker.

We cannot advise you on price of water or match you individually with a buyer/seller.

Buyers and sellers still need to go through our normal application process.

Trading applications must be submitted to Southern Rural Water and approval granted before water is taken. A water transfer application form can be downloaded from our application page.

If you want to trade upstream, please speak with one of our Assessment Officers prior to submitting an application.

To check if a buyer or seller can trade with you, call us on 1300 139 510 and ask to speak to an Assessment Officer.

Not a water broker

It's important to note that Southern Rural Water is not acting, and will not act, as a water broker.

We cannot advise you on price of water or match you individually with a buyer/seller.

Buyers and sellers still need to go through our normal application process.

Click here to download our Fact Sheet

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