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Author Topic: Mitta Mitta River Flow advice: Dartmouth to Hume transfers commence this week  (Read 3234 times)

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Mitta Mitta River Flow advice: Dartmouth to Hume transfers commence this week
22 January 2013 - MDBA

'Harmony' transfers from Dartmouth Reservoir to Lake Hume will commence this week due to continued hot, dry conditions and a high demand on water held in Hume Reservoir.

One aim of harmony transfers is to provide additional flood mitigation capacity at Dartmouth Reservoir for the coming winter and spring without impinging upon the security of supply to downstream water users. Harmony transfers benefit the operations of the Dartmouth power station, reduce the rate of fall of Hume Reservoir and provide higher in-channel flows in the Mitta Mitta River.

The transfers will also reduce the need for very large volumes to be transferred in 2013-14 should dry conditions be seen next season. This in turn will reduce the risks of channel erosion from prolonged high flow rates in the Mitta Mitta River.

In order to maximise the environmental benefits of the harmony transfers, flow rates over the coming weeks will be varied as described below (see Figure 1).

Figure 1. Proposed flow and river depth at Colemans gauge.

The flow rate will be increased to 2,000 ML/day at Colemans (1.7 m gauge height) on Thursday morning, 24 January. If inflows from Snowy Creek remain low, the flow at Tallandoon is expected to be about 2,000–2,700 ML/day from late Thursday afternoon, 24 January.

Flow will be increased to about 2,500 ML/day (1.8 m gauge height) on Wednesday morning, 30 January.

Beginning on Monday morning, 4 February, flow at Colemans will be further increased to 7,000 ML/day (2.45 m gauge height) and this will be maintained for 3 days. This peak is expected to result in a flow at Tallandoon of 6,600–7,300 ML/day (2.4–3 m gauge height).

From Thursday morning, 7 February, flow at Colemans will be gradually reduced to 4,500 ML/day by Friday afternoon, 8 February.

Thereafter, the flow at Colemans is expected to remain between 3,500 and 4,500 ML/day (1.95–2.15 m gauge height) until late February. During this period, the flow at Tallandoon would be about 3,500– 4,800 ML/day (2.3–2.55 m gauge height), if inflow from Snowy Creek remains low.

Rates of rise in the river at Colemans will follow operational guidelines, with the rate of fall being about 10 mm/hour.

If there is substantial rainfall during the next 4 weeks, it is possible that this planned release may be reduced or cancelled. A further flow advice will be issued if these plans are significantly changed.

The transfer of significant volumes of water from Dartmouth to Hume Reservoir is likely to continue during the next few months if conditions remain dry. The flow rates will aim to benefit the local communities and the environment of the Mitta Mitta River without significantly impacting on river users.

MDBA provides a flow forecast each Wednesday for the following week on the MDBA website at

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

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