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The Lake ever more closed

By johnboy - 25 May 2012 30

The National Capital Authority have let it be known that Lake Burley Griffin is so bad they’ve had to turn off the water jet for fear of spreading the poison:

Lake Burley Griffin is closed to activities that involve whole-body water contact or submersion of the head due to extreme levels of blue-green algae.

National Capital Authority chief executive, Gary Rake said there has been a significant spike in blue-green algae levels over the last week.

“Water quality results received today indicate blue-green algae levels are more than 1000 times higher than the level considered safe for activities such as swimming,” he said.

Extreme levels of the blue-green algae strain, Anabaena circinalis have been recently detected.

“More worryingly, this is a very different strain of blue-green algae from the one we typically experience over the summer months. Lake users who engaged in secondary contact activities over summer need to carefully reassess the risks.”

The Captain Cook Memorial Jet in Central Basin will remain off as winds can create fine mists and cause jet water to travel to areas around the lake, potentially exposing the public to algae either through direct contact with, or inhalation of, the mist.

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30 Responses to
The Lake ever more closed
AAMC 3:33 pm 25 May 12

djk said :

AAMC said :

Drain the Lake, clear out all of the sediment and organic matter….

And build a heap of units?

um, no…….even if the dam was removed totally it is still a water course, so no units unless they can float.
I would suggest to simply empty scrape all of the high nutrient sediment and deepen where possible; then close the dam and fill backup.

wildturkeycanoe 3:00 pm 25 May 12

EvanJames said :

Overheard said :

In all my life living here in Canberra I’ve never seen it this bad.

Because Canberra’s never been this big. The nutrients come from greater numbers of people and the waste they generate. The garden fertilisers, discarded rubbish… general dirtiness of large numbers of people living in a defined space.

Another of the wonders of population growth. I doubt we’ll see the lake being used for swimming etc at all in the future. If it’s this bad during cooler weather, warmer weather will have it absolutely blossoming.

I disagree – fallout into LBG from the population above the water line wouldn’t have increased that much. The parliamentary triangle and Civic areas haven’t grown that much. Maybe from Gungahlin’s eastern suburbs fallout yes, but the rest of population growth doesn’t affect the lake. If your argument has merit, why not Lake Ginninderra as well? Perhaps all the recent flooding may explain a lot of this yuk, and the runoff from Canturf.

Overheard 2:12 pm 25 May 12

DrKoresh said :

Maybe I’m too young but I can’t ever remember a time when the lake was nice enough to want to swim in. 😐 It’s always been pretty festy, hasn’t it?

I used to swim it when I were a young’un back in the mid-17th century and I turned out….. ah, er, hmmm.

Maybe it was always a dangerous place.

shirty_bear 2:10 pm 25 May 12

DrKoresh said :

Maybe I’m too young but I can’t ever remember a time when the lake was nice enough to want to swim in. 😐 It’s always been pretty festy, hasn’t it?

We didn’t think twice about jumping into LBG when I lobbed here in Cbr in the mid-80’s.

HenryBG 2:01 pm 25 May 12

Tetranitrate said :

AAMC said :

Drain the Lake, clear out all of the sediment and organic matter….should fix the problem for a while.

No doubt it’d probably solve a few missing persons cases as well.

Perhaps find that missing Rueger at last. Unless the cops already did find it and aren’t telling us about it….

The time to drain the lake was during the drought when the Federal refused to renegotiate its water access rights with the ACT government. Would have greatly assisted the ACT’s negotiations. Typical useless local pollies missed a golden opportunity there.

djk 1:49 pm 25 May 12

AAMC said :

Drain the Lake, clear out all of the sediment and organic matter….

And build a heap of units?

DrKoresh 1:41 pm 25 May 12

Maybe I’m too young but I can’t ever remember a time when the lake was nice enough to want to swim in. 😐 It’s always been pretty festy, hasn’t it?

Keijidosha 1:29 pm 25 May 12

AAMC said :

Drain the Lake, clear out all of the sediment and organic matter….should fix the problem for a while.

Such a simple idea that has been used elsewhere in Australia with success. It doesn’t solve the underlying problem of excess nutrients entering the lake, but it will eradicate the immediate risk. It also allows removal of hazardous objects and other remedial works to be carried out. Seems like a no-brainer to me.

EvanJames 1:28 pm 25 May 12

Overheard said :

In all my life living here in Canberra I’ve never seen it this bad.

Because Canberra’s never been this big. The nutrients come from greater numbers of people and the waste they generate. The garden fertilisers, discarded rubbish… general dirtiness of large numbers of people living in a defined space.

Another of the wonders of population growth. I doubt we’ll see the lake being used for swimming etc at all in the future. If it’s this bad during cooler weather, warmer weather will have it absolutely blossoming.

rosscoact 1:22 pm 25 May 12

shirty_bear said :

Seems odd to have happen now … we’ve had plenty of water flowing through and it hasn’t been hot.
And there’s two solarbees doing their darndest, right?

Surely the Canturf farm at the top of the lake has a hand in this? I don’t notice other lakes in the area being similarly affected right now …

I think you’re on the money there. Has the nutrient leaching from Canturf ever been assessed?

Tetranitrate 1:04 pm 25 May 12

AAMC said :

Drain the Lake, clear out all of the sediment and organic matter….should fix the problem for a while.

No doubt it’d probably solve a few missing persons cases as well.

Overheard 12:10 pm 25 May 12

In all my life living here in Canberra I’ve never seen it this bad. I walked around the north side on Sunday afternoon and was struck by what I thought was on over-powering fragrant odour from the surrounding foliage before realising it was coming off the lake.

The whole surface has covered in a thick green sludge and the swans were leaving trails as they cut through the water. Yikes! No wonder they want to turn off the spout.

KB1971 12:05 pm 25 May 12

Not surprised, we were watching the jet from here in the office the other day & it had a green/brown look about the water as it was spraying up into the sky, not the normal white jet.

AAMC 12:03 pm 25 May 12

Drain the Lake, clear out all of the sediment and organic matter….should fix the problem for a while.

shirty_bear 11:53 am 25 May 12

Seems odd to have happen now … we’ve had plenty of water flowing through and it hasn’t been hot.
And there’s two solarbees doing their darndest, right?

Surely the Canturf farm at the top of the lake has a hand in this? I don’t notice other lakes in the area being similarly affected right now …

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