Click here to load reader

River Murray Weekly Report - Murray-Darling Basin Authority · PDF file River Murray Weekly Report For the week ending Wednesday, 19th June 2019 Trim Ref: D19/30160 ... The Bureau

  • View
    3

  • Download
    0

Embed Size (px)

Text of River Murray Weekly Report - Murray-Darling Basin Authority · PDF file River Murray Weekly...

  • Subscribe to the River Murray Weekly Report River Data website Water in Storages

    River Murray Weekly Report For the week ending Wednesday, 19th June 2019

    Trim Ref: D19/30160

    Rainfall and inflows For the week ending 19th June, widespread rainfall was recorded over northern Victoria and southern New South Wales. Rainfall totals in excess of 50 mm were recorded over the Victorian alpine region and central highlands. The highest Victorian rainfall totals were recorded in the Ovens River valley including; 125 mm at Rocky Valley, 52 mm at Cheshunt and 45 mm at Mount Buffalo. Other notable totals were 108 mm at Mt Buller and 55 mm at Trentham. The highest New South Wales rainfall totals included 32mm at Taralga in the southern tablelands, 29 mm at Perisher Valley and 36 mm at Thredbo AWS (both just outside the Basin).

    Map 1-Murray-Darling Basin rainfall totals for week ending 19 June (Source: Bureau of Meteorology)

    Modest streamflow responses were observed in the upper Murray catchments following widespread rainfall, most of which fell last Wednesday. The upper Murray River at Biggara increased to just over 1,500 ML/day early in the week before receding to the current flow of 740 ML/day. The upper Mitta Mitta River at Hinnomunjie increased to 8,000 ML/day before receding to the current flow of 1,550 ML/day. Downstream of Hume Reservoir, flow in the Kiewa River measured at Bandiana peaked at around 4,250 ML/day and is now 2,300 ML/day. The Ovens River measured at Wangaratta increased to just under 5,000 ML/day, the highest flow in the Ovens River since December 2018. The flow is currently 2,500 ML/day.

    The Bureau of Meteorology (BoM) are forecasting dry conditions in their 8 day outlook. Without further rainfall, streamflows in the upper Murray tributaries will continue to recede.

    http://www.mdba.gov.au/river-information/weekly-reports https://riverdata.mdba.gov.au/ https://www.mdba.gov.au/managing-water/water-storage http://www.bom.gov.au/jsp/watl/rainfall/pme.jsp

  • River Murray Weekly Report

    Subscribe to the River Murray Weekly Report River Data website Water in Storages

    River operations

    River operations The MDBA active storage volume increased by 83 GL this week to 3,194 GL (38% capacity).

    At Dartmouth Reservoir, the storage volume increased by 11 GL to 2,489 GL (65% capacity). Releases from Dartmouth to Hume Reservoir continued this week supporting water levels in Hume Reservoir in preparation for future downstream system demands. Based on current conditions and forecasts, MDBA aims to target a transfer volume of around 85 GL for the month of June. Whilst adjustments to the monthly transfer volumes may occur, overall transfers are expected to continue through winter and spring if below average inflow conditions continue. Further information can be found on the MDBA website.

    The release from Dartmouth, measured at Colemans, increased over the week to the current flow of 4,500 ML/day. The release from Dartmouth is planned to fluctuate between 3,500 ML/day and 4,800 ML/day until the end of June. These variable releases aim to transfer the target volumes to Hume, whilst minimising erosion along the Mitta Mitta River.

    At Hume Reservoir, the storage volume increased by 69 GL to 630 GL (21% capacity). The Hume release continued at a minimum of 600 ML/day throughout the week as increased inflows from the Kiewa and Ovens Rivers were sufficient to meet flow requirements in the River Murray downstream. As tributary flows continue to recede over the coming week, the release from Hume will be gradually increased.

    Downstream at Lake Mulwala the level is currently 124.78 m AHD. Around 50 ML/day of environmental entitlement continues to be diverted into Yarrawonga Main Channel for release into the lower Broken Creek for the benefit of native fish. The release from Yarrawonga Weir downstream increased to the current rate of 6,500 ML/day, in response to higher inflows from the Kiewa and Ovens Rivers. Looking ahead, the release from Yarrawonga is planned to fluctuate between 6,000 ML/day and 7,000 ML/day until the end of June, with target flows regularly re- assessed in light of updated system planning and bulk water transfer requirements.

    The Edward and Gulpa offtakes are currently passing 1,100 and 270 ML/day respectively. Regulator gates for the Gulpa Creek have been reinstated to regulate the flow below 350 ML/day over the coming week. Flows into the Edward River (photo 1) will continue to fluctuate in response to changes in the release downstream of Yarrawonga. The flow at Stevens Weir rose slightly to 650 ML/day.

    Inflow to the Murray from the Goulburn River, measured at McCoys Bridge, averaged 1,080 ML/day. The flow at McCoys will likely continue around this rate during June. This flow is above the normal minimum flow rate of 350 ML/day due to the delivery of environmental water to benefit native fish in the lower Goulburn River and downstream along the River Murray.

    Delivery of Inter Valley Trade (IVT) from the Goulburn system ceased on 31 May 2019. The volume of IVT delivered to the Murray in 2018-19 was close to 430 GL. This volume was not just a record for the Goulburn Valley, but also for the combined volume of IVT (Goulburn and Murrumbidgee valleys) delivered in a water year. Victoria, as the manager of the Goulburn IVT rules, is conducting a review of IVT rules to better understand and help manage the impact of IVT deliveries on the river banks of the lower Goulburn River. More information can be found at http://waterregister.vic.gov.au/about/news/251-monitoring-the-victorian-water-market-in-2017-18 and https://www.premier.vic.gov.au/water-market-improvements-for-northern-irrigators/. The current Goulburn IVT balance is around 110 GL. More information regarding current opportunities for allocation trade between the Goulburn and Murray valleys is available at the Victorian water register website.

    The diversion at National Channel remained steady near 470 ML/day and is being undertaken (using Victorian held environmental entitlements) to maintain flow in Gunbower Creek for the benefit of native fish.

     Upper Murray tributaries receding from recent flow peaks

     Lock 8 targeting 40 cm below FSL

     Transfers from Dartmouth to Hume Reservoir continuing

    http://www.mdba.gov.au/river-information/weekly-reports https://riverdata.mdba.gov.au/ https://www.mdba.gov.au/managing-water/water-storage https://www.mdba.gov.au/river-information/flow-advice http://waterregister.vic.gov.au/about/news/251-monitoring-the-victorian-water-market-in-2017-18 https://www.premier.vic.gov.au/water-market-improvements-for-northern-irrigators/

  • River Murray Weekly Report

    Subscribe to the River Murray Weekly Report River Data website Water in Storages

    Photo 1: An early morning on the Edward River (photo courtesy: MDBA)

    The Torrumbarry Weir pool remains at the current level of 30 cm below Full Supply Level (FSL). Further lowering of the weir pool by up to 20 cm may be undertaken depending on the flows and river levels at Echuca. The weir pool will be returned to FSL by early August in time for the commencement of the irrigation season. This action is part of the weir pool variability program and aims to help improve the stability of the river banks and other environmental outcomes within the influence of the weir pool. River users and landholders in the weir pool should remain aware

    of the changing water level in case adjustments need to be made to pumps, moorings and recreational activities. Further information is available in the Torrumbarry Media Release.

    The release downstream of Torrumbarry Weir remained fairly steady around 4,000 ML/day and is expected to gradually increase to around 5,000 ML/day over the coming week. Lock 26 at Torrumbarry remains closed while repairs are made to damaged inlet valves.

    Inflows from the Murrumbidgee River, measured at Balranald, increased to just over 1,000 ML/day. The current Murrumbidgee IVT balance is 23 GL, enabling trade into the Murrumbidgee Valley. The WaterNSW website contains information on the current Murrumbidgee IVT account status.

    At Euston, the weir pool level is currently targeting 30 cm below FSL. The downstream release is 6,000 ML/day.

    In the northern Basin, flows resulting from a significant rainfall event in late March have continued to move steadily downstream along the Warrego and Paroo systems. Follow-up rainfall helped the Warrego flow reach the Darling River. The flow front reached Wilcannia this week averaging 420 ML/day. The upstream flow at Tilpa continues to recede and is now 110 ML/day. If any volume reaches the Menindee Lakes it is likely to be small and while positive, will have little impact on the conditions of the lakes and the lower Darling. Upstream on the Border Rivers and Gwydir River, releases on behalf of environmental water holders are continuing to move downstream and along the

    http://www.mdba.gov.au/river-information/weekly-reports https://riverdata.mdba.gov.au/ https://www.mdba.gov.au/managing-water/water-storage https://www.mdba.gov.au/media/mr/joint-media-release-varied-pool-levels-torrumbarry-improve-river-bank-health https://www.g-mwater.com.au/news/media-releases1/lock-26-emptied-while-repairs-assessed.html https://www.waternsw.com.au/customer-service/ordering-trading-and-pricing/trading/murrumbidgee

  • River Murray Weekly Report

    Subscribe to the River Murray Weekly Report River Data website Water in Storages

    Barwon River. These flows continue to provide environme