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Author Topic: River Murray Ops Update – 21 Nov  (Read 3338 times)

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River Murray Ops Update – 21 Nov
« on: November 27, 2012, 08:09:55 AM »
River Murray Ops Update – 21 Nov - MDBA

River Operations

MDBA active storage decreased by 115 GL this week and is currently 8,478 GL, or 99% capacity. At Dartmouth Reservoir, the storage volume held relatively steady, decreasing by only 3 GL to 3,810 GL (99% capacity). Inflows initially reduced from 2,100 ML/day to 800 ML/day earlier in the week, however rain caused inflows to briefly rise again to 2,200 ML/day. The release, measured at Colemans, was reduced from 2,700 ML/day to 900 ML/day and will be reduced further to 350 ML/day by this weekend. See the attached flow advice for more details.

At Hume Reservoir, the storage volume reduced by 58 GL to 2,871 GL (96% capacity). Inflows receded over the week from 11,000 ML/day to around 6,000 ML/day. The release averaged 14,700 ML/day.

At Yarrawonga Weir, total diversions at the irrigation offtakes increased from 8,000 ML/day to 9,000 ML/day this week. Demand is anticipated to rise in the coming week as temperatures in the irrigation districts are forecast to reach close to 40ēC on the weekend. The pool level in Lake Mulwala is 124.78 m AHD. The downstream release was around 8,100 ML/day for most of the week and is currently 9,000 ML/day.

On the Edward River system, flow through the Edward and Gulpa offtakes held relatively steady at around 1,450 ML/day and 500 ML/day respectively. Inflow from the Edward Escape averaged 1,700 ML/day, while diversion to the Wakool Main Canal averaged 1,300 ML/day. Downstream of Stevens Weir, the flow averaged 1,100 ML/day but is expected to reduce to around 900 ML/day in the coming week.

On the Goulburn River, the flow at McCoys Bridge increased to 5,000 ML/day due to the release of an environmental pulse from Lake Eildon which commenced on 9 November. The higher flows are expected to continue at McCoys Bridge for around two weeks. At Torrumbarry Weir, the diversion at National Channel averaged 3,100 ML/day but is expected to reduce to 2,300 ML/day in the coming week as diversions of environmental water to Gunbower Creek cease. Downstream of Torrumbarry Weir, the release has risen to 6,300 ML/day and will continue rising over the coming week in response to increased inflows from the Goulburn River.

On the lower Murrumbidgee River, the flow at Balranald peaked at 6,000 ML/day, and will fall away over the coming week. This peak was less than expected due to higher diversions at Maude and Redbank Weirs to the Lowbidgee irrigation district. Downstream on the Murray at Euston the flow held relatively steady at around 12,600 ML/day.

Total storage at Menindee Lakes decreased by 43 GL this week to 1,819 GL (105% capacity). The release to the lower Darling River (measured at Weir 32) increased to 4,900 ML/day. Releases will continue to increase to 9,000 ML/day by Sunday 25 November. See the attached flow advice for more details. Downstream on the lower Darling River, the flow at Burtundy eased further and is currently 2,800 ML/day.

At Wentworth Weir, the flow was relatively steady averaging 13,100 ML/day. Further downstream at Lake Victoria the volume reduced by 11 GL to 652 GL (26.8 m AHD, 96%capacity). It is expected to continue falling away over the coming weeks. The flow to South Australia decreased from 16,500 ML/day to around14,000 ML/day, where it is expected to remain over the coming week.

At the Lower Lakes, the 5 day average level for Lake Alexandrina was 0.80 m AHD. The level will fall away toward 0.75 m AHD in the coming week as water is released to help maintain the water level in the Coorong. Currently a small number of Barrage gates remain open with an estimated release of around 4,000 ML/day to the Coorong.

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