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Cotter Dam expansion up to 14 metres, the trickier 65 to go.

By johnboy 27 September 2011 24

ACTEW have posted more glorious video of their work to build the new Cotter Dam.

Intriguing that they’re building the intake tower with jump form construction which they claim is unique.

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24 Responses to
Cotter Dam expansion up to 14 metres, the trickier 65 to go.
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milkman 5:02 am 29 Sep 11

welkin31 said :

#15 braddonboy 11:02 am, 28 Sep 11 said “…so the new dam wall is only good if it rains a lot? ”
Not quite braddonboy – in the July 2007 ACTEW report, “Water Purification Scheme for the ACT”, in para 1.1.7 it says – “On average some 29 GL of water spills from Bendora and Cotter Reservoirs each year.”

Google will find the report for you.
So at that rate – assuming no drawdown at Cotter, it would only take 2.7 years to fill the new Cotter dam – under “average” conditions – whatever ACTEW means by that.
Note the 29GL PA is over half our typical consumption.
I think the huge spillages make the new Cotter a no-brainer. Even a new Cotter half the size would have had big advantages.
Interesting that the Wikipedia entry is a bit misleading – maybe one part of ACTEW not knowing what some other part has already said.
And we have not even mentioned 2010.

Yep – the idea is that the extra storage means the catchments higher up can be used more effectively.

gooterz 12:19 am 29 Sep 11

Which will be finished first?

Glenlock or Cotter?

chewy14 7:37 pm 28 Sep 11

dungfungus said :

I trust Actew are using only Australian concrete and steel in this construction?

Well seeing as all the aggregate has been quarried on site, at least you know that part will be true blue Aussie rock.

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