Here comes 100%

johnboy 6 December 2010 58

[First filed: Dec 3, 2010 @ 10:44]

This was the Cotter Dam yesterday:

cotter dam

And this is it today

cotter dam in flood [Photos by Androo]

Note the bed of the new dam wall appears to be disappearing fast.

On the bright side ACTEW CEO Mark Sullivan has tweeted thusly:

We will likely see dams at 100% capacity within the day. Googong will top as early as this afternoon. The flow over Cotter is amazing.

If it buckets down again today we could start seeing some major infrastructure failures. Yesterday afternoon was scary.

UPDATE: ActewAGL are warning that the brown water is getting browner as the stormwater getting into sewage has overloaded the Molonglo Water Quality Control Centre which is now releasing partially treated effluent:

ActewAGL advises all residents on the Murrumbidgee River, downstream from the junction of the Molonglo River and above Burrinjuck Reservoir, and the general public not to draw water from the above section of the Murrumbidgee River for either potable (drinking or food preparation) or non-potable domestic purposes for the next 72 hours, due to potentially increased health risks resulting from the partially treated sewage/effluent. We also advise against swimming and other water contact sports in the Murrumbidgee River over this period.

And Another Thing: Thanks to everyone who’s sent in photos, the slideshow below is looking great and includes pictures of Googong overspilling and where Lake George is at. (if you’ve got more images@the-riotact.com )

And here’s some video of the mighty Cotter:


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58 Responses to Here comes 100%
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Jclarke Jclarke 3:33 pm 06 Dec 10

Laest video – this time, from ACTEW
http://www.youtube.com/watch?v=2VP6FiVpgUE

Enjoy.

Holden Caulfield Holden Caulfield 8:09 pm 05 Dec 10

androo said :

Sadly the road is locked during wet weather as it’s susceptible to landslips, water over road, and is quite slippery in places. I had access arranged to photograph it as there’s very few photographs of it in spill, even fewer of all five spillways flowing.

Bloody loud too, 40m dead fall into the spillway channel below… I grabbed a quick vid (first time capturing video on my dslr) http://www.youtube.com/watch?v=ucC3DeHRPAU

Thank you, the video worked very well.

creative_canberran creative_canberran 5:15 pm 05 Dec 10

miz said :

This is brilliant! This is one of those ‘catchup’ rainy summers. I just wish the Cotter or Tennent were complete.

As I have mentioned on the Riot before, ACTEW (Mark Sullivan) has previously stated that the expanded Cotter and other measures (pipelines etc) will only keep ACT’s water secure until 2035.
Given the drought patterns of the regions listed below, (as previously cited on this site), we are going to need yet another dam by 2035.

(Dates from Cedric Bryant’s ‘Gardening’ in CT Relax 31/10/2010):
1902
[probably other years need to be inserted here, but special mention to 1933 as we had very severe bush fires that year, indicating similar conditions to 2003]
1944
1957
1968
1982
(then, obviously 2003 to 2008/2009).

Also, it’s worth noting that our current dams are not necessarily secure.
An ACTEW report from 2004 looked at various options for expanding Bendora Dam including raising the wall or installing fuse plugs in the spillways.
However, due to the horizontal compaction of the rock on the left side of the dam and the angle of the rock face, special braces were used during construction to hold the dam wall up. The braces are now past their designed life cycle so no expansion is possible.

I’ve also read reports about the existing Cotter Dam including leakage through the wall and doubts about what exactly the state of its foundations are. It shouldn’t be a surprise that early reports looked at expanding the Cotter by building on top of the existing wall, yet later reports favoured a totally new wall far downstream.

androo androo 4:28 pm 05 Dec 10

Holden Caulfield said :

Cool, I wasn’t aware that access to Bendora was possible. Do you need a 4WD or can any flashy hatchback make it?!

Sadly the road is locked during wet weather as it’s susceptible to landslips, water over road, and is quite slippery in places. I had access arranged to photograph it as there’s very few photographs of it in spill, even fewer of all five spillways flowing.

Bloody loud too, 40m dead fall into the spillway channel below… I grabbed a quick vid (first time capturing video on my dslr) http://www.youtube.com/watch?v=ucC3DeHRPAU

GardeningGirl GardeningGirl 1:47 pm 05 Dec 10

Great pics. Love the nighttime ones of Scrivener Dam, and the latest ones of the clouds by Pommy Bastard.

sepi sepi 1:29 pm 05 Dec 10

So did the Woden drains cope with all the rain I wonder.

Did the planned Woden Green area (former flood plain) survive ok?

Holden Caulfield Holden Caulfield 11:17 am 05 Dec 10

Three post nutbag?

Some extra YouTube footage…

Scrivener Dam
Googong Dam

They must have just finished the Googong spillway works in the nick of time!

Holden Caulfield Holden Caulfield 11:11 am 05 Dec 10

georgesgenitals said :

Most of the people there were totally fine – being very careful and considerate. Just a few silly buggers.

How was that spillway though? The mist rising from the waterfall and the noise were really amazing.

It makes for a spectacular sight, that’s for sure.

Also, when you’re at the main viewing area for Googong, on the water side of the dam, the fact you could see water splashing up on the other side of the spillway was pretty amazing too. I don’t expect we’ll see that too often.

Holden Caulfield Holden Caulfield 11:00 am 05 Dec 10

androo said :

Bendora Dam was in full force today, all five spillways dropping a deafening amount of water into the Cotter. Pics now in the RiotAct slideshow 🙂

Cool, I wasn’t aware that access to Bendora was possible. Do you need a 4WD or can any flashy hatchback make it?!

peterh peterh 7:19 am 05 Dec 10

weather is all over the place, last night we had fog rolling in, canberra was warmed a bit by it – temp went up a couple of degrees. eerie outside, but it was 3am after all, and the souls out on the roads weren’t your usual drivers. reckon we will get more rain tonight, now really starting to behave like the tropics.

Antagonist Antagonist 11:25 pm 04 Dec 10

I was watching some of my local bogans having some fun driving a 4WD in a stormwater drain next to Isabella Drive this morning. They were towing one of their kids behind said 4WD on an inflated tyre tube. I was most pleased to see that they had given serious consideration to safety. Bogan child was wearning a helmet and life jacket! Piss funny 🙂

So what have your local bogans been doing in the rain ???

androo androo 7:51 pm 04 Dec 10

Bendora Dam was in full force today, all five spillways dropping a deafening amount of water into the Cotter. Pics now in the RiotAct slideshow 🙂

georgesgenitals georgesgenitals 7:31 pm 04 Dec 10

Also, we’ve just had another 32mm of rain in Queanbeyan, all coming up from the south. There should be even more water going over there tomorrow!

Homeless Homeless 7:30 pm 04 Dec 10

Don’t you just love the drought? I mean flood.

georgesgenitals georgesgenitals 7:30 pm 04 Dec 10

Holden Caulfield said :

georgesgenitals said :

I went and had a look at the Googong spillway this afternoon – wow! Be careful if you go to look, because there are lots of people out there, and not all of them understand the concept of drving carefully around groups of people, and not walking out in front of traffic without looking.

I had a gander too. And while I didn’t see too many dopes, it doesn’t surprise me. They should have been selling tickets today!

Most of the people there were totally fine – being very careful and considerate. Just a few silly buggers.

How was that spillway though? The mist rising from the waterfall and the noise were really amazing.

Holden Caulfield Holden Caulfield 6:39 pm 04 Dec 10

georgesgenitals said :

I went and had a look at the Googong spillway this afternoon – wow! Be careful if you go to look, because there are lots of people out there, and not all of them understand the concept of drving carefully around groups of people, and not walking out in front of traffic without looking.

I had a gander too. And while I didn’t see too many dopes, it doesn’t surprise me. They should have been selling tickets today!

miz miz 6:37 pm 04 Dec 10

‘Oak before ash, you’re in for a splash;
Ash before oak, you’re in for a soak!’

I happened to notice that, this spring, my ash trees sprouted leaves well before the oaks behind my office building did, so perhaps there’s something in the old country saying . . . !

miz miz 6:31 pm 04 Dec 10

This is brilliant! This is one of those ‘catchup’ rainy summers. I just wish the Cotter or Tennent were complete.

As I have mentioned on the Riot before, ACTEW (Mark Sullivan) has previously stated that the expanded Cotter and other measures (pipelines etc) will only keep ACT’s water secure until 2035.
Given the drought patterns of the regions listed below, (as previously cited on this site), we are going to need yet another dam by 2035.

(Dates from Cedric Bryant’s ‘Gardening’ in CT Relax 31/10/2010):
1902
[probably other years need to be inserted here, but special mention to 1933 as we had very severe bush fires that year, indicating similar conditions to 2003]
1944
1957
1968
1982
(then, obviously 2003 to 2008/2009).

troll-sniffer troll-sniffer 6:18 pm 04 Dec 10

On my wee ride around the old LBG this mornin’ on the trusty treadlie I did percept that the level of LBG has been lowere to maybe 15-20cm lower than full. Rocks appeared next to the wall opposite the hospital, and as me and the pedals slunk delicately under the bridge it was evident from the gap between the high water mark and the current level that some serious lettin’ out of the water down at Scrivener has been taking place.

Reckon it’s either a flood mitigation strategy to give more leeway if the Molonglo upstream starts to really flood, or it might be a release of water to dilute our poo that we have sent down to the fortunate folks further down the Murrumbidgee.

Anyone with some real dinky di knowledge?

georgesgenitals georgesgenitals 4:53 pm 04 Dec 10

I went and had a look at the Googong spillway this afternoon – wow! Be careful if you go to look, because there are lots of people out there, and not all of them understand the concept of drving carefully around groups of people, and not walking out in front of traffic without looking.

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