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  • River Murray Ops Update – 26 September 5 1

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River Murray Ops Update – 26 September
« on: October 01, 2014, 11:25:22 PM »
River Murray Ops Update – 26 September
Sep 26 - MDBA
Welcome to this week’s River Ops update.

MDBA total storage fell by 16 GL this week, with the active storage now 6,423 GL (76% capacity).

At Dartmouth Reservoir, higher releases are being made to transfer water to Lake Hume in order to meet downstream demands in coming months. If conditions remain dry, transfers of water from Dartmouth to Hume are likely to continue through to autumn. Releases from Dartmouth increased over the past week to 6,400 ML/day, and will target around 7,000 ML/day in the coming week. The storage volume decreased by 17 GL to 3,672 GL (95% capacity).

Inflows to Hume Reservoir averaged 10,700 ML/day this week, increasing the storage by 6 GL to 2,276 GL (76% capacity). Releases increased to 11,400 ML/day, before gradually decreasing to 7,000 ML/day in anticipation of reduced demand due to rainfall forecast on Wednesday 24 September.

At Lake Mulwala, diversions at the major irrigation offtakes reached 2,300 ML/day at Mulwala Canal and 1,500 ML/day at Yarrawonga Main Channel before easing later in the week. The release from Yarrawonga Weir increased from 6,500 ML/day to 10,000 ML/day (around channel capacity) in order to meet downstream demand, including the transfer of water to Lake Victoria.

In the Edward-Wakool system, flow through the Edward and Gulpa offtakes averaged around 1,400 ML/day and 350 ML/day respectively. On the Edward River, the flow downstream of Stevens Weir averaged around 600 ML/day. The Wakool River at Wakool-Barham Road is steady at 440 ML/day.

On the Goulburn River, the flow at McCoys Bridge is currently 1,350 ML/day and forecast to rise to around 3,000 ML/day in the coming week. The flow is currently above the normal minimum due to the delivery of environmental water destined for South Australia. Flows in the Goulburn are being varied for the benefit of local riparian vegetation.

River Murray, SA. Photo: MDBA.

At Torrumbarry Weir, National Channel was steady at 3,400 ML/day whilst the inlet to Koondrook-Perricoota Forest has reduced from 800 ML/day to 100 ML/day. Diversions into Koondrook-Perricoota Forest will cease in the coming week. The release from Torrumbarry Weir averaged 2,900 ML/day, and is forecast to rise toward 8,000 ML/day late in the coming week.

Further downstream, inflows to the Murray from the Murrumbidgee River at Balranald are steady at around 1,350 ML/day. At Euston,thepool level is being managed at around 20 cm above the Full Supply Level (FSL) of 47.6 m AHD and the downstream release averaged 7,900 ML/day.

At Hattah Lakes, water returning to the Murray via ‘Messengers’ regulator increased to around 600 ML/day. Water is also being released via ‘Oateys’ regulator to Chalka Creek at around 200 ML/day, however this water has further to travel and is not expected to reach the Murray until next week. Around 130 ML/day is being pumped into Lake Kramen – a large episodic wetland some distance from the rest of the lakes. Pumping into Lake Kramen is expected to continue until early January 2015.

At Menindee Lakes, the storage volume has decreased 10 GL to 320 GL (18% capacity), with around 4 GL released to supply demand in the lower Daring and via Cawndilla outlet and the remainder lost to evaporation. The release from the Lakes at Weir 32 is currently 140 ML/day following the decision by NSW Office of Water to reduce releases below the minimum of 200 ML/day. The reduced releases are a contingency measure to protect Broken Hill’s water supply through to 2015-16 should dry conditions persist in the Darling. NSW Office of Water is closely monitoring flows in the Lower Darling River, with the aim of maximising the volume of water retained in the Lakes whilst still ensuring there is a visible flow at Burtundy. For more information please visit the NSW Office of Water website.

At Wentworth Weir on the Murray, the pool level is being held around 10 cm above FSL. This is aimed at assisting irrigators within the weir influence to continue to divert water while there are low flows in the Lower Darling. The release from Wentworth Weir averaged 8,400 ML/day and is forecast to fall to around 7,000 ML/day over the coming week.

At Lake Victoria, the storage volume increased by 5 GL to 669 GL (99% capacity). The flow to South Australia is currently around 7,150 ML/day. This incorporates entitlement flows, environmental water traded from the Goulburn River, and environmental water being used to test the new works on the Chowilla Floodplain.

At the Lower Lakes, the five-day average water level in Lake Alexandrina is 0.73 m AHD and the total barrage release is around 1,600 ML/day.
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