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Murrumbidgee River in Flood
Lens: HDDA* 16-50 PLM Camera: K3iii Photo Location: Canberra, Australia ISO: 100 Shutter Speed: 1/60s Aperture: F9 
Posted By: RobG, 11-14-2021, 07:10 AM

We've had a lot of rain recently, and the local river is in flood. The drought has well and truly broken, and we're into the other extreme in Australia - the flooding rains. The dam downstream of where I took this photo is at 97% so it won't be long before it overflows, and the flood will begin it's long journey to the sea near Adelaide (about 1,400 km by road, longer by river).



The Murrumbidgee River at Shepherd's Lookout
by RobGeraghty, on Flickr
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11-14-2021, 11:54 AM   #2
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That is quite a change. Is the dam already releasing water?
11-14-2021, 04:52 PM   #3
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QuoteOriginally posted by MikeNArk Quote
That is quite a change. Is the dam already releasing water?
I just checked and the Water NSW website says that the data was updated yesterday, but the dam is still at 97% so it isn't overflowing. However, they also report that the dam is receiving about 37 GL and releasing about 10 GL a day. The dam capacity is about 1,026 GL. Weirdly, that suggests that the dam will be full in a couple of days, yet the percentage hasn't shifted. Having said that, 10GL a day going downstream is a LOT of water.
11-14-2021, 05:17 PM   #4
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QuoteOriginally posted by RobG Quote
I just checked and the Water NSW website says that the data was updated yesterday, but the dam is still at 97% so it isn't overflowing. However, they also report that the dam is receiving about 37 GL and releasing about 10 GL a day. The dam capacity is about 1,026 GL. Weirdly, that suggests that the dam will be full in a couple of days, yet the percentage hasn't shifted. Having said that, 10GL a day going downstream is a LOT of water.
Those are interesting numbers. Makes you wonder how the inflow is calculated.

11-14-2021, 06:25 PM   #5
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QuoteOriginally posted by MikeNArk Quote
Those are interesting numbers. Makes you wonder how the inflow is calculated.
There is a network of river flow gauges and level gauges across NSW. I am guessing that they exchange data with the ACT since a lot of the current flows will be coming from the Cotter river and the Molonglo which flow through the ACT, as well as the headwaters of the Murrumbidgee in the Snowy Mountains. The dam levels in the Snowy Mountains are actually mostly low, especially Tantangara which is on the Murrumbidgee and it's only around 20% full, so the water can only be coming from downstream of Tantangara..
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