Thar she blows! New Cotter Dam overspilled

johnboy 2 March 2012 76

The Cotter Dam Expansion Dam Cam is showing the worst case scenario of flood waters rising over the under-construction wall as the capacity of the river diversion is comprehensively overwhelmed.

Let’s hope the raging torrent doesn’t undermine the wall or this will become a disaster of 2003 bushfires proportion.

We certainly hope that doesn’t happen, but it’s not like this was meant to happen either.

UPDATE 01/03/12 09:10: Thanks to dpm for pointing us at the above video compression of the overspill

cotter dam overspill

[Photo by Androo]

UPDATE 02/03/12 8:18: And she’s still going very strong this morning:

cotter dam

UPDATE 02/03/12 09:31: This in from ACTEW supremo Mark Sullivan:

MarkS
2012/03/02 at 8:21 am

This morning observations are that the dam structure is sound. Heavy machinery has remained safe and cranes are fine. Have lost some forms and scaffolding and some light equipment. Biggest concern is the washing out of earthwork on the downstream side (looking at damcam it is on the left abutment or the right hand side looking at the dam). Possibly be a week before we get back on the dam and looks like a three week clean up. Flood is a one in one hunred year event so top marks to the engineers. Now we wait till tomorrows renewed assault.


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76 Responses to Thar she blows! New Cotter Dam overspilled
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HenryBG HenryBG 6:23 pm 03 Mar 12

dungfungus said :

HenryBG said :

shauno said :

I blame Tim Flannery for saying never again would we have our dams filled.

Tim Flannery said no such thing.

Please take care you don’t fall for fossil-fuel-industry-funded propaganda which is intended to “prevent science from being taught in the classrooms”, as recently leaked documents have revealed.

Depends what you mean by “science”

Suddenly the interests of academia and industry lobbyists collide ans post-modernist thinking gets a new lease of life.

Science is science. And liars hate science, because science proves them wrong, hence the big anti-science PR-campaign that’s on at the moment.

dungfungus dungfungus 5:58 pm 03 Mar 12

HenryBG said :

shauno said :

I blame Tim Flannery for saying never again would we have our dams filled.

Tim Flannery said no such thing.

Please take care you don’t fall for fossil-fuel-industry-funded propaganda which is intended to “prevent science from being taught in the classrooms”, as recently leaked documents have revealed.

Depends what you mean by “science”

dungfungus dungfungus 5:56 pm 03 Mar 12

Deref said :

Does anyone know what Lake George is looking like?

It looks wet, like any other lake.
When Lake George is empty, why isn’t it just called “George”?

HenryBG HenryBG 5:15 pm 03 Mar 12

shauno said :

I blame Tim Flannery for saying never again would we have our dams filled.

Tim Flannery said no such thing.

Please take care you don’t fall for fossil-fuel-industry-funded propaganda which is intended to “prevent science from being taught in the classrooms”, as recently leaked documents have revealed.

Deref Deref 3:51 pm 03 Mar 12

Does anyone know what Lake George is looking like?

steveu steveu 3:51 pm 03 Mar 12

Peekz said :

Surely this rain was factored in the to project schedule?

I am positive that rain was factored into the project schedule as is with most major construction schedules – but I dont believe the data was there to be able to throw this amount of rainfall on BOM’s crystal ball…

IYou would reasonably expect a reduction in our water prices now, since we have had so much of it lately? I mean it was put up becuase we had so little of it before (and our water quality is so good). Fat chance I guess.

I suppose we have to boost ACTEWS profits back somehow somehow for being so responsible when there was a shortage of water (and I do think Canberrans in particular have done a great job in being responsible, with the odd exception – and have had restrictions longer than most other states)

shauno shauno 9:27 am 03 Mar 12

I blame Tim Flannery for saying never again would we have our dams filled.

LSWCHP LSWCHP 10:25 pm 02 Mar 12

Skidbladnir said :

MarkS said :

Flood is a one in one hunred year event so top marks to the engineers.

*grumblegrumblegurmble*

Annual 1% non-dependant probability.
There is a sixty something percent chance of a 1% annual flood risk being realised once or more in a 100 year period.

The water table around my place has risen above ground level, so I have some minor flooding under my house. The same thing happened about 18 months ago, when we had a very wet weekend that was also a once in (some number of years) weather event.

Seems like these once in 40/80/100/whatever year rain events are becoming quite frequent. 🙁

YetAnotherBlowIn YetAnotherBlowIn 8:39 pm 02 Mar 12

Mark Sullivan has tweeted this photo taken from the abutment above the new dam. You can’t see the tracks on the excavator in the bottom of the photo which makes the water, what, 1 metre deep?

gooterz gooterz 6:49 pm 02 Mar 12

If the dam was built already this would have filled it?

Funky Claude Funky Claude 5:29 pm 02 Mar 12

Peekz said :

thatsnotme said :

Hmmm, interesting. So Mr Evil = Funky Claude’s troll account??

No, Funky Claude just can’t quote properly.

Defiantly not a troll account. I thought I would be smart and delete the bulk of the post and somehow ended up integrating the two. I will go back to watching from the sidelines.

Thumper Thumper 1:53 pm 02 Mar 12

Nothing a few thousand besa bricks couldn’t fix.

caf caf 1:27 pm 02 Mar 12

I think we should leave it like this and just build a few more viewing platforms. We could be Australia’s version of Niagra Falls – we’ll make a motza from the honeymooners!

Peekz Peekz 11:52 am 02 Mar 12

dpm said :

Thumper said :

We’re not very good at making things here in the ACT, are we…

Not sure what you mean exactly? 1) You can’t control the weather and 2) for something that was/is half-built when this rain ‘event’ hit (I love it how the media have embraced the new ‘event’ terminology!), there don’t seem to be any issues that have been caused by human error in the building process. Not sure what more they could have done here…..? 🙂

Surely this rain was factored in the to project schedule?

dpm dpm 11:32 am 02 Mar 12

Thumper said :

We’re not very good at making things here in the ACT, are we…

Not sure what you mean exactly? 1) You can’t control the weather and 2) for something that was/is half-built when this rain ‘event’ hit (I love it how the media have embraced the new ‘event’ terminology!), there don’t seem to be any issues that have been caused by human error in the building process. Not sure what more they could have done here…..? 🙂

Thumper Thumper 11:26 am 02 Mar 12

Thoroughly Smashed said :

Thumper said :

We’re not very good at making things here in the ACT, are we…

It seems to be holding up…

I grant you that 🙂

Diggety Diggety 11:23 am 02 Mar 12

Skidbladnir said :

MarkS said :

Flood is a one in one hunred year event so top marks to the engineers.

*grumblegrumblegurmble*

Annual 1% non-dependant probability.
There is a sixty something percent chance of a 1% annual flood risk being realised once or more in a 100 year period.

You’re right of course Skid, but the “One in X years flood” is understood by most people; incorrectly, but nevertheless understood.

Thoroughly Smashed Thoroughly Smashed 11:08 am 02 Mar 12

Thumper said :

We’re not very good at making things here in the ACT, are we…

It seems to be holding up…

Peekz Peekz 11:02 am 02 Mar 12

As long as we don’t try to implode the dam in 50 years we should be fine 😉

Thumper Thumper 10:39 am 02 Mar 12

Thumper said :

We’re not very good at making things here in the ACT, are we…

Although I will admit that it is going to be seriously awesome when finished.

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