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Cotter Dam enlargement moves ahead

By johnboy - 22 June 2009 37

Andrew Barr has announced that he’s happy with the Environmental Impact Statement Assessment Report (EISAR) for the Cotter Dam expansion.

Now we just need to wait for the Commonwealth to agree.

ACTEW are breaking out the champagne.

What’s Your opinion?


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37 Responses to
Cotter Dam enlargement moves ahead
Clown Killer 1:11 pm 22 Jun 09

However, the regrowth in the affected areas, and there’s heaps, has now negateg any ill affect from run off so i don’t think that it is an issue.

My view, and I’m not saying it’s 100% right, is based on what I’ve been told by foresters familiar with the catchment and the species growning up there. Their view was one of 10-15 years before inflows per rain event get anything near the pre-fire state.

Clown Killer 1:09 pm 22 Jun 09

Sure, they decided to leave the magic inaccessible-area bushfire evaporation machine in the garage!

I’m guessing you missed the outcomes of the Coroners investigations then.

Skidbladnir 12:59 pm 22 Jun 09

Until the new dam fills, using the firebucket on a helicopter right near the dam wall when you have a massive expanse of water all at the same level would be borderline ridiculous.
And the bucket would have to be drawing water from 50m below the (future) surface of the new dam to make contact with the old dam wall.

chewy14 12:43 pm 22 Jun 09

Won’t be that exciting. All you will see is the water going over the top of the old dam, like it does a few times nearly every year, and filling the space between.

TP 3000 said :

I have been told that the ACT Labour Party are trying to have the dam completed AFTER an election. As they know that as soon as the Cotter dam is enlarged our dam capacity will go from 45% to 20%.

But caf, I would of thought that the old dam wall will be blown up, as it causes a hazard when we have another drought & when helicopters come in to fill their buckets, the buckets might catch on the old wall & bring the helicopter down. Or they may even temporarily empty Cotter (transfer the water to Googong) & remove the wall & empty Googong Dam (via transfer again) to make the new Cotter Dam look all full & pretty.

I think your figures are a bit off if you think we will go from 45% to 20% when the new dam is built. If anything i think the government would want it built before the election to show off their new infrastructure. And that helicopter must be pulling water from pretty deep if you think the bucket could get caught on the old dam.

Thumper 12:38 pm 22 Jun 09

I too am of the opinion that the government of 2003 did not do enough to prevent the fires and instead where quite happy to turn their collective backs and hope that it all just went away.

However, the regrowth in the affected areas, and there’s heaps, has now negateg any ill affect from run off so i don’t think that it is an issue.

And I still want to see this sucker when she’s filling up.

Thumper 12:35 pm 22 Jun 09

I’m not sure high Corin dam is but if Cotter is that big then I too want to be out there to watch the sucker fill up. It will be spectacular to say the least.

caf 12:35 pm 22 Jun 09

TP 3000: Nah you can read the plans online – they’re going to leave the old wall in place. It shouldn’t present a hazard to anyone, since the top of it’ll be at least 50 metres under water.

“chose to let the catchment go up in smoke”? Sure, they decided to leave the magic inaccessible-area bushfire evaporation machine in the garage!

Spectra 12:34 pm 22 Jun 09

But caf, I would of thought that the old dam wall will be blown up
Nup, last plan I read was just to build a new one in front of it. Seems perfectly sensible to me.

as it causes a hazard when we have another drought
What kind of hazard exactly?

Hells_Bells74 12:16 pm 22 Jun 09

Clown Killer said :

…water from where? not enough rain to fill it yet.

Oh there’s been mor than enough rain to fill the cotter dam many times in the last six years. It’s just that the new growth in the catchment sucks up the majority of the water and will continue to do so for possibly the next decade. Don’t let the Government fool you into believing that we have water restrictions because there’s a drought. We have water restrictions becuase in January 2003 the ACT Government chose to let the catchmnt go up in smoke.

Oh, it makes my day when I read someone not fooled (right or wrong). I suspect you are dead on the money.

TP 3000 12:10 pm 22 Jun 09

I have been told that the ACT Labour Party are trying to have the dam completed AFTER an election. As they know that as soon as the Cotter dam is enlarged our dam capacity will go from 45% to 20%.

But caf, I would of thought that the old dam wall will be blown up, as it causes a hazard when we have another drought & when helicopters come in to fill their buckets, the buckets might catch on the old wall & bring the helicopter down. Or they may even temporarily empty Cotter (transfer the water to Googong) & remove the wall & empty Googong Dam (via transfer again) to make the new Cotter Dam look all full & pretty.

Skidbladnir 12:05 pm 22 Jun 09

PeterH:
As caf says, the water doesn’t need to fill the dam to capacity, just overflow over the old wall for long enough to fill the new bit of space, and then a bit more.

According to the EIS the new 76m dam is being built 125m downstream, and the current wall is 26m high.

Anyone know the actual volume of the downstream component between old wall and new wall?

Interested people shouild be able to work out a guesstimated timeframe for inundating the old wall if you knew inflows, and data from how they intend to manage basic environmental outflows in the interim…
(ACTEW plan on a natural upstream catchment of between 69 – 73GL/pa inflow, environmental outflow from Cotter was ~=14GL/year (averaging 444L/second) in the last report I can find.)

Clown Killer 12:01 pm 22 Jun 09

…water from where? not enough rain to fill it yet.

Oh there’s been mor than enough rain to fill the cotter dam many times in the last six years. It’s just that the new growth in the catchment sucks up the majority of the water and will continue to do so for possibly the next decade. Don’t let the Government fool you into believing that we have water restrictions because there’s a drought. We have water restrictions becuase in January 2003 the ACT Government chose to let the catchmnt go up in smoke.

caf 10:41 am 22 Jun 09

It doesn’t need to fill to overtop the old dam – just has to fill the comparitively small space between the old dam and the new dam wall. The water will probably come from Corin.

peterh 10:38 am 22 Jun 09

caf said :

When it’s finished, I’m keen to go out there and watch as the old dam disappears beneath the water.

um, the water from where? not enough rain to fill it yet.

caf 10:36 am 22 Jun 09

When it’s finished, I’m keen to go out there and watch as the old dam disappears beneath the water.

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