Update (1/9) on Wivenhoe Dam as of 11am on 28/02/2022:
The peak flood levels being experienced now would have occurred naturally without Wivenhoe Dam releases.
Wivenhoe Dam has performed exactly how it was designed to operate...
The peak flood levels being experienced now would have occurred naturally without Wivenhoe Dam releases.
Wivenhoe Dam has performed exactly how it was designed to operate...
(2/ 9)
The inflow into Somerset and Wivenhoe Dams, experienced as a consequence of this extreme weather event, has been 2.2 million megalitres.
Only 150,000 megalitres of this has been released so far in a slow and controlled way to protect Brisbane.
Wivenhoe is doing its job
The inflow into Somerset and Wivenhoe Dams, experienced as a consequence of this extreme weather event, has been 2.2 million megalitres.
Only 150,000 megalitres of this has been released so far in a slow and controlled way to protect Brisbane.
Wivenhoe is doing its job
(3/ 9)
The way Wivenhoe is operating through this event is completely different to what occurred in 2011.
The way Wivenhoe is operating through this event is completely different to what occurred in 2011.
(4/9)
On Thursday, 24 February, Wivenhoe was at approximately 58% drinking supply level, with full flood storage capacity available. This means around 2,459,000 ML megalitres storage was available prior to the extreme weather.
On Thursday, 24 February, Wivenhoe was at approximately 58% drinking supply level, with full flood storage capacity available. This means around 2,459,000 ML megalitres storage was available prior to the extreme weather.
(5/9)
This put Seqwater in a great position to respond to the extreme weather as it has unfolded.
Seqwater is using the temporary flood storage compartment to hold back these extraordinary amounts of water from Brisbane.
This put Seqwater in a great position to respond to the extreme weather as it has unfolded.
Seqwater is using the temporary flood storage compartment to hold back these extraordinary amounts of water from Brisbane.
(6/9)
The full use of the drinking supply capacity and the flood storage capacity takes the dam up to about 200%, plus then there is additional dam safety capacity on top of that.
The dam has remained under the 200% mark throughout the peak last night, which is really good news
The full use of the drinking supply capacity and the flood storage capacity takes the dam up to about 200%, plus then there is additional dam safety capacity on top of that.
The dam has remained under the 200% mark throughout the peak last night, which is really good news
(7/ 9)
Seqwater has been able to operate under the flood manuals to strike the balance between maintaining emergency response capacity in the dam and preventing worse flooding in Brisbane.
Seqwater has been able to operate under the flood manuals to strike the balance between maintaining emergency response capacity in the dam and preventing worse flooding in Brisbane.
(8/9)
While Seqwater works with BOM to closely monitor the forecasts, the flood manuals enable Seqwater to respond in real time to real conditions.
Flood engineers have been able to do this through slow controlled releases which has not exacerbated the natural peak of the river
While Seqwater works with BOM to closely monitor the forecasts, the flood manuals enable Seqwater to respond in real time to real conditions.
Flood engineers have been able to do this through slow controlled releases which has not exacerbated the natural peak of the river
(9/9)
This was not the case in 2011, when the conditions in the lead up to the significant rainfall were entirely different, and the dam was operated differently.
This was not the case in 2011, when the conditions in the lead up to the significant rainfall were entirely different, and the dam was operated differently.
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