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Author Topic: Dartmouth Dam release  (Read 4700 times)

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Dartmouth Dam release
« on: December 11, 2012, 09:37:09 AM »
Mitta Mitta River flow advice: Dartmouth pulsed release commencing 6 December 2012
30 November 2012 - MDBA

A 'pulsed' release of water from Dartmouth Dam is planned to commence on Thursday morning, 6 December 2012. This pulse will have a short peak of up to 2,350 ML/day, with flows greater than 650 ML/day extending for 5 days. As with the previous pulses last summer, this release aims to manage the water quality in the downstream section of the Mitta Mitta River.


The increased release from Dartmouth Dam is currently planned to commence at 8 am on Thursday 6 December, from a flow of 400 ML/day at Colemans gauge, to about 2,350 ML/day by 4 pm.

The flow rate at Colemans will then be gradually lowered, starting Friday night (7 December), to gradually return to between 400–600 ML/day by Thursday 13 December. Rates of rise and fall in the river at Colemans will follow operational guidelines.

With the forecast inflow from Snowy Creek, assuming no rain, the pulsed release is expected to result in a flow at Tallandoon of less than 2,500 ML/day (less than 2.1 m local gauge height). If there is substantial rainfall over the coming days, the river level at Tallandoon may temporarily rise above 2,500 ML/day, in response to tributary inflows to the Mitta Mitta River downstream of Dartmouth Reservoir. It is also possible that this planned release may be reduced, or cancelled, in response to higher natural flows.

Further pulsed releases are likely over summer. Pulsed releases aim to benefit the environment of the Mitta Mitta River without significantly impacting on river users.

Landholders and river users, including pumpers, should take in to account the increase flow rates along the Mitta Mitta River and make any necessary adjustments to their river activities.



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Re: Dartmouth Dam release
« Reply #1 on: December 28, 2012, 09:26:26 PM »
Mitta Mitta River Flow advice: Higher flows downstream of Dartmouth Dam
19 December 2012

Releases from Dartmouth Dam will be increased to 600 ML/day on the morning of Thursday 20 December 2012, due to recent inflows. As a result, the gauge height at Colemans will increase from about 1.1 m to about 1.25 m.

A 'pulsed' release of water from Dartmouth Dam is planned for late December 2012.

During the pulsed release, the flow at Colemans gauge will start to increase very early on Saturday 29 December, reaching about 2,600 ML/day (1.8 m gauge height) by 8am. This flow rate will be maintained until mid-afternoon on Monday 31 December 2012.

By mid-afternoon on Tuesday 1 January 2013, the flow will be reduced to between 600–1,000 ML/day (1.25-1.4 m gauge height at Colemans), depending on rainfall.

Rates of rise and fall in the river at Colemans will follow operational guidelines.

With the forecast inflow from Snowy Creek, the pulsed release in late December is expected to result in a flow at Tallandoon of less than 3,000 ML/day (less than 2.2 m local gauge height).

However, if there is substantial rainfall over the coming days, the river level at Tallandoon may temporarily rise above 3,000 ML/day from tributary inflows to the Mitta Mitta River downstream of Dartmouth Reservoir.

It is also possible that this planned pulsed release may be reduced, or cancelled, in response to higher natural flows.

Further pulsed releases are likely over summer. Pulsed releases aim to benefit the environment of the Mitta Mitta River without significantly impacting on river users.

Landholders and river users, including pumpers, should take in to account the increase flow rates along the Mitta Mitta River and make any necessary adjustments to their river activities.

ENDS


 

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