River Murray Weekly Report




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River Murray Weekly Report


For the week ending Wednesday, 28 May 2016
Trim Ref: D14/17826

Rainfall and Inflows

Conditions cooled across the southern Basin this week in the wake of a cold front that broke the spell of unseasonably warm weather. The cold front generated widespread rain across north-east Victoria and much of New South Wales, with particularly good falls across the upper Murray catchments (Figure 1).

Alpine regions recorded the highest rainfall totals for the week, including 163 mm at Mt. Hotham (Vic.), 159 mm at Rocky Valley (Vic.) and 116 mm at Perisher Valley (NSW). In Queensland, 36 mm was logged at Drillham in the upper Condamine catchment, and in South Australia, 18 mm was recorded at Meningie.





Map 1 - Murray-Darling Basin rainfall for the week ending 28 May 2014 (Source: Bureau of Meteorology).

Stream flows in the upper tributaries responded positively to the rain, with most sites recording their highest flows for 2014. On the Mitta Mitta River, the flow at Hinnomunjie Bridge increased from 400 ML/day to 5,000 ML/day. The Murray at Biggara rose from 300 ML/day to 2,000 ML/day. On the Kiewa River, the flow at Mongans Bridge increased from 450 ML/day to 3,000 ML/day, and on the Ovens River, the flow at Rocky Point rose from 700 ML/day to 5,000 ML/day. River levels at each of these sites will now be receding as the flow peaks progress downstream.

River Operations


  • Environmental watering has commenced at Gunbower Forest and Hattah Lakes utilising environmental works.

  • Lowering of Torrumbarry weir pool may no longer be required due to recent inflows.

  • Several lower Murray weir pools continue to be held above full supply levels.




Figure 2 – Current key operations

MDBA total storage increased by 34 GL this week, with the active storage now 4,935 GL or 54% capacity. Releases from the upper storages are being held to a minimum, with tributary inputs meeting the majority of system demands. At Dartmouth Reservoir, the storage volume has increased by 8 GL to 3,443 GL (89% capacity). The flow at Colemans is steady at 200 ML/day.

At Hume Reservoir, the storage volume has increased by 32 GL to 1,248 GL (42%). The release is steady at 600 ML/day. Downstream, moderate inflows from the Kiewa and Ovens Rivers are expected in the coming week. These tributary inputs will lead to an increase in the pool level at Yarrawonga Weir, which is forecast to approach the full supply level of 124.9 m AHD. The downstream release from Yarrawonga Weir has been increased from 1,800 ML/day to 2,800 ML/day. Further small increases to the release are likely over the coming week to manage inflows into the weir pool.

On the Edward River system, the combined inflow through the Edward and Gulpa offtakes is around 150 ML/day. The flow downstream of Stevens Weir is steady at 300 ML/day. On the Goulburn River, the flow at McCoys Bridge is 1,000 ML/day and forecast to rise over coming days to around 2,500 ML/day.

At Torrumbarry Weir, the pool level is steady at the full supply level of 86.05 m AHD. As a result of recent inflows, the proposed draw-down of the weir pool has now been postponed until further notice.

Diversions at National Channel have been raised to 500 ML/day this week to supply an environmental watering event in Gunbower Forest. Environmental water is being delivered to the forest (Figure 3) via the new Hipwell Road Channel. The bulk of water will be delivered over the winter months outside of the irrigation season. Further information is available on the North Central Catchment Management Authority website (www.nccma.vic.gov.au).





Figure 3 – Environmental water begins flowing into Gunbower Forest via the Hipwell Road Channel

(Photo courtesy Anna Chatfield, NCCMA)

At Swan Hill the flow is currently 3,200 ML/day. The flow is forecast to reduce to around 2,300 ML/day over coming days before rising again late next week. Downstream at Euston Weir, the pool level is steady at 47.80 m AHD (20 cm above full supply level) and the release is around 4,500 ML/day.

Environmental watering has also commenced this week at Hattah Lakes, located off the main Murray channel between Euston and Mildura weir pools (Figure 4). Environmental water is planned to be pumped into the central lakes over several months, with approximately half of the water expected to be returned to the River Murray starting in October. Further information is available on the Mallee Catchment Management Authority website (http://www.malleecma.vic.gov.au).



Figure 4 – Environmental water being pumped into Chalka Creek, which flows into Hattah Lakes

(Photo courtesy Heather Peachey, MDBA)

At Menindee Lakes, the storage volume has decreased by 2 GL and is now 394 GL (23% capacity). The release at Weir 32 is 200 ML/day, which corresponds with a downstream flow at Burtundy of around 140 ML/day.

The flow at Wentworth Weir peaked at 4,500 ML/day this week, and is expected to recede to around 3,400 ML/day over coming days. The storage in Lake Victoria has decreased by 6 GL to 438 GL (65% capacity, 24.90 m AHD).

Flow across the border to South Australia averaged 3,600 ML/day over the past week. The target flow over the coming week will be 3,000 ML/day, which is the average daily entitlement flow for June. At the Lower Lakes, the five-day average level in Lake Alexandrina is steady at 0.64 m AHD. The release through the barrages is estimated to be around 2,200 ML/day.

For media inquiries contact the Media Officer on 02 6279 0141

DAVID DREVERMAN



Executive Director, River Management
Water in Storage Week ending Wednesday 28 May 2014

MDBA Storages

Full Supply Level

Full Supply Volume

Current Storage Level

Current

Storage

Dead Storage

Active Storage

Change in Total Storage for the Week

 

(m AHD)

(GL)

(m AHD)

(GL)

%

(GL)

(GL)

(GL)

Dartmouth Reservoir

486.00

3 856

479.48

3 443

89%

71

3 372

+8

Hume Reservoir

192.00

3 005

180.98

1 248

42%

23

1 225

+32

Lake Victoria

27.00

677

24.90

438

65%

100

338

-6

Menindee Lakes

 

1 731*

 

394

23%

(- -) #

0

-2

Total

 

9 269

 

5 523

59%

- -

4 935

+34

Total Active MDBA Storage

 

 

 

 

 

 

54% ^

 

 

 

 

 

 

 

 

 

 

Major State Storages

























Burrinjuck Reservoir

 

1 026

 

572

56%

3

569

+2

Blowering Reservoir

 

1 631

 

862

53%

24

838

-4

Eildon Reservoir

 

3 334

 

2 289

69%

100

2 189

+13

* Menindee surcharge capacity – 2050 GL ** All Data is rounded to nearest GL **

# NSW takes control of Menindee Lakes when storage falls below 480 GL, and control reverts to MDBA when storage next reaches 640 GL

^ % of total active MDBA storage

Snowy Mountains Scheme Snowy diversions for week ending 27 May 2014



Storage

Active Storage (GL)

Weekly Change (GL)

Diversion (GL)

This Week

From 1 May 2014

Lake Eucumbene - Total

1 536

-2

Snowy-Murray

+8

63

Snowy-Murray Component

823

+34

Tooma-Tumut

+2

13

Target Storage

1 290

 

Net Diversion

6

49

 

 

 

Murray 1 Release

+13

74

Major Diversions from Murray and Lower Darling (GL) *

New South Wales

This Week

From 1 July 2013

Victoria

This Week

From 1 July 2013

Murray Irrig. Ltd (Net)

-0.3

1080

Yarrawonga Main Channel (net)

0

312

Wakool Sys Allowance

1.0

50

Torrumbarry System + Nyah (net)

0.4

539

Western Murray Irrigation

0.1

26

Sunraysia Pumped Districts

0.3

110

Licensed Pumps

1.0

238

Licensed pumps - GMW (Nyah+u/s)

0.3

172

Lower Darling

0.1

198

Licensed pumps - LMW

5.7

295

TOTAL

1.9

1592

TOTAL

6.7

1428

* Figures derived from estimates and monthly data. Please note that not all data may have been available at the time of creating this report.

** All data above is rounded to nearest 100 ML for weekly data and nearest GL for cumulative data**




Flow to South Australia (GL)

* Flow to SA will be greater than normal entitlement for this month due to the delivery of additional environmental water.



Entitlement this month

93.0 *

 

Flow this week

25.3

(3 600 ML/day)

Flow so far this month

105.1




Flow last month

183.5







Salinity (EC) (microSiemens/cm at 25o C)

 

Current

Average over the last week

Average since 1 August 2013

Swan Hill

140

130

90

Euston

140

140

100

Red Cliffs

180

170

120

Merbein

180

170

130

Burtundy (Darling)

560

530

500

Lock 9

180

200

180

Lake Victoria

220

210

240

Berri

360

350

270

Waikerie

330

320

320

Morgan

360

370

320

Mannum

360

370

360

Murray Bridge

470

460

370

Milang (Lake Alex.)

690

690

680

Poltalloch (Lake Alex.)

600

550

560

Meningie (Lake Alb.)

2 500

2 620

2 650

Goolwa Barrages

2 390

1 230

1 290
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