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Hume and Dartmouth Dams operations update – 21 September 2022

This update provides an overview on how the Murray–Darling Basin Authority is managing Hume Dam and Dartmouth Dam during the current high flows.
Published: 21 September 2022

This update provides an overview on how the Murray–Darling Basin Authority is managing Hume Dam and Dartmouth Dam during the current high flows.

The regular update includes:

  • catchment conditions
  • forecast rainfall and inflows
  • water releases
  • planned management for the coming week.

Catchment conditions

For the week of 14 to 20 September the rainfall for Victoria and southern New South Wales was largely above average. Soil moisture levels continue to be above average for this time of year with around a quarter of the catchment still over 90% saturated.

For the week of 14 to 20 September the rainfall for Victoria and southern New South Wales was largely above average.
Rainfall totals from 14 September to 9am on 20 September 2022

Forecast rainfall and inflows

Rainfall totals to 26 September to be potentially in the range of 50–100mm for parts of the Upper Murray region
Total forecast rainfall for 7 days, 20 to 26 September (guide only)

The Bureau of Meteorology is expecting rainfall totals to 19 September to be potentially in the range of 50–100mm for parts of the Upper Murray region.

The 7-day forecast map is automatically generated and subject to change daily when the models are run.

The Bureau of Meteorology is the best source of information to stay up-to-date with more detailed  forecast rainfall and flood information.

The outlook for the next 2 weeks shows a lower chance of above-median rainfall than previous weeks. The outlook for the next 3 months through to the end of the year shows a high change of above-median rainfall.

h change of above-2 maps showing the outlook of rainfalls in the Basin. On the left the next 2 weeks shows a high chance of above-median rainfall. The right map shows a similar picture with higmedian rainfall in spring
The chance of above-median rainfall in the coming 2 weeks (left) and 3 months (right)

The status of the Bureau of Meteorology’s El Niño–Southern Oscillation Outlook has been raised to La Niña. The Bureau reports that models are indicating this La Niña event may peak during the spring and return to neutral conditions early in 2023. La Niña events increase the chances of above-average rainfall for northern and eastern Australia during spring and summer.

In addition, the negative Indian Ocean Dipole (IOD) event continues and is likely to continue into late spring. A negative IOD event is typically associated with above average spring rainfall for much of Australia. 

Snapshot: Dartmouth and Hume

Summary of water storage levels in Hume and Dartmouth Dams
The overall situation of Hume and Dartmouth dams on 14 September

Dartmouth Dam and Hume Dam this week 

Flood operations are being conducted at Hume and Dartmouth dams.

Airspace has reduced at both dams as a result of recent rain.​

The MDBA now expect water to flow over the spillway at Dartmouth Dam by tomorrow. Decisions to release water through the valves at Dartmouth Dam will be adjusted as water begins to flow over the spillway.

​At Hume Dam releases were increased this morning, 21 September in anticipation of forecast rain.

Are you flood ready?

If you live, work or holiday on a floodplain, be prepared


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Develop your personalised flood emergency plan for your home and property
www.ses.nsw.gov.au
www.ses.vic.gov.au/plan-and-stay-safe


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All residents can sign up for the Early Warning Network to be notified about Hume Dam release activities during periods of flooding or high releases
www.waternsw.com.au/supply/ewn


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Check the BoM website to receive the latest weather and flood information and warnings in your area
www.bom.gov.au/australia/flood
www.bom.gov.au/australia/warnings

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