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Author Topic: Barra going over the Awoonga wall yesterday  (Read 25761 times)

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Re: Barra going over the Awoonga wall yesterday
« Reply #45 on: December 22, 2010, 05:32:09 AM »
hi lyndon
your question are not unreasonable, but i will make a start on the reply....

first of all the discharge of water to lower dam levels to prevent the dam would be a little too hard to predict and a major gamble.  the valves at full crack release 12,000 megalitres per 24 hours, but the inflow at its peak was 72,000.  the valving just would not keep up with the inflow.  the next 4-5 five days is going to be interesting with the amount of flow.  i met with derm yesterday and they beleive that the dam spillway wont get over 1.1m, but it think this week will test her out.  i think that the key point that everyone has to realise on this one is that the water is core business and the fishery is a gift from gawb (they legally dont have to stock the dam) and while ever it is under private stocking control, the numbers will remain large going in, and it will keep its own hatchery. 

locals are not taxed as of yet under the QCA new reveiw.  but soon...... maybe.

procurement plans are in the process of being developed and working on preventative measures. 

just got back from stocking some barra at monduran and they too are loosing some fish but there is still a crapload more water to enter the dam in the next day or so.  both dams loo good out there at the moment.

hope this helps lyndon, take care

kh

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Re: Barra going over the Awoonga wall yesterday
« Reply #46 on: December 22, 2010, 06:05:48 AM »
Releasing water from dams is a bit of an art form.
Depending on the dam, the down stream conditions and topography and the layering in the dam itself. Also the flood storage capacity of the dam allows them different options. IE Somerset and Wivanhoe they can stage the releases, NPD has no flood storage, when its gotta go its gotta go!

For all dams big Flood events just happen, no control, no ability to control!

But small releases are generally planned carefully to minimise environmental issues, allow for best control of the water strata in the dam etc.

For example
NPD has changed its techniques to open cone valves where possible, they lose less fish that way - if they open a gate or two they ensure as they close the gates the cone valves are open, then slowly taper off the cone valves to ensure water levels drop reasonably slowly.

This is because there is basically no downstream pondage, a quick close off of water flow means lung fish stuck out of the water. A slow lowering of the water level and the fish (of all types) tend to move in to the pools and channels and not get stranded. Busy workers rescuing live fish looks much better on the news that shoveling dead endangered fish in to skips.

The temperature of the water released from dams can also be an issue. Water released from valves low down can be quite cold compared to river water temperatures and upset the downstream environment, I dont know much about that one. It has not been a problem here that I am aware of, they dont do environmental flows in my local dams. It is apparently a problem on the Murray at times, no doubrt it would affect other systems as well.

And of course if they are releasing water they dont want to upset the water quality if they can help it. Different strata at the same location in the dam can require significantly different amounts and types of treatment. They may be pretty keen not to do anything that mixes those strata on small releases.

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Re: Barra going over the Awoonga wall yesterday
« Reply #48 on: December 22, 2010, 07:13:44 PM »
Considering Awoonga has been spilling over for about ten days, between about 50-101cm over, from only small falls in the right area ( a week apart), I believe we are in for a flogging when it rains like cats and dogs in the coming future. It'll be interesting to see the back up of water in the Boyne Valley district along with a pumping dam wall, if and when Mother Nature pours. In the first few months of this year, the lake rose about 10 metres from the rains, and it rose about 17m about 8? yrs ago. Can we picture  the results from similar types of situations?
Depressions, monsoon troughs, cyclone events- "doo doo doo doo, doo doo doo doo!" That spooky music looms , close by! I don't think we've seen the beginning yet, and as Kurt aludes to- it's beyond any human's control to stop it. BOM tells a story that spells- BEWARE!
Johnny

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Re: Barra going over the Awoonga wall yesterday
« Reply #49 on: December 22, 2010, 07:37:48 PM »
johnny
i spoke with the disaster management mob late this arvo and the gladstone region warning and heavy forecast has been downgraded with most of the action north of mackay.  still sweatin bullets though.  hopefully it eases enough so that we can get the first injection of barra into awoonga and the last load into monduran/lenthals.  still looks pretty average weather. 

cheers
kh

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Re: Barra going over the Awoonga wall yesterday
« Reply #50 on: December 22, 2010, 08:26:37 PM »
This is the latest from the State Disaster Coordination Group statewide teleconference today.

BOM has confirmed that a tropical low is expected to cross the coast between Cairns and Townsville on Saturday morning. The low will begin to impact upon the Queensland coastline with heavy rain from late Friday. All Queensland coastal areas can expect rain from late Friday, increasing to heavy falls across the weekend and easing to showers on Monday. Up to 400mm of rain is expected between Cardwell and Mackay. Falls of between 50mm and 100mm are expected in the south east and falls of between 100mm and 200mm are expected in many parts of an already saturated central Queensland.

BOM says if the rain is spread evenly over the period from late Friday to Monday morning, there is a chance the water may run off without causing major problems. If however, we get intense rain in short periods, we could experience major flooding. It is very much a wait and see situation.

All emergency response agencies are on high alert. Strong winds are now expected in coastal areas, with an outside chance of winds escalating to gale force. Sea swells are expected to be moderate. King tides are causing minor flood problems in some areas already.

This is obviously a report that impacts on coastal areas as well as dams and their catchment areas. Interesting reading though.

There will be another debrief tomorrow after another teleconference.

Cheers
Paul

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Re: Barra going over the Awoonga wall yesterday
« Reply #51 on: December 22, 2010, 08:43:50 PM »
Thanks Kurt, Paul.
There will be eyes, ears and sixth senses on full alert in Q land this week. I hope santa makes it through.

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Re: Barra going over the Awoonga wall yesterday
« Reply #52 on: December 22, 2010, 08:52:13 PM »
No probs Johnny. I'll post an update after we get debriefed tomorrow. Although I'd bet leftie that the forecasting models will still be Wet Wet Wet. Santa might need a boat, not a sled. A sixth sense would come in handy for sure.

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Re: Barra going over the Awoonga wall yesterday
« Reply #53 on: December 22, 2010, 11:15:27 PM »
What am I doing at Awoonga   :walkplank   -   Oh well , got the tent set up without everything getting totally saturated.

Chris

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Re: Barra going over the Awoonga wall yesterday
« Reply #54 on: December 23, 2010, 09:16:42 AM »
Here is a BOM tool that can be used as a predictor for this wet weather approaching QLD.


http://www.bom.gov.au/australia/charts/viewer/index.shtml?type=mslp-precip&tz=AEST&area=Au&model=G


Regards
Darren

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Re: Barra going over the Awoonga wall yesterday
« Reply #55 on: December 23, 2010, 09:39:02 AM »
Thanks Darren. That looks like it could be a very useful tool in the coming months.

Cheers
Paul

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Re: Barra going over the Awoonga wall yesterday
« Reply #56 on: December 23, 2010, 08:39:08 PM »
Here is today's update (3.00pm Thursday) from the State Disaster Coordination Group: The low everyone is watching in the far north is now expected to cross the Queensland coast much further north above Cairns.

Previously, it was thought the low would cross the coast between Cairns and Townsville. The low is expected to travel across Cape York and into the Gulf late Friday and Saturday. This means the heaviest rain will be experienced on the lower Cape and around Cairns. Areas south of Cairns down to about Bundaberg can expect about 200mm over Saturday and Sunday. The South East can expect heavy rain from about Sunday.

BOM said the situation remains serious and is about to issue a Severe Weather Warning. Their situational reports will be updated every six hours.

All emergency response agencies remain on alert, and are standing by.

The State Disaster Management Group will hold an extraordinary meeting tomorrow at 10am.

Cheers
Paul

 

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