Namoi ROSCCo (River Operations Stakeholder Consultation Committee) 23 July 2020
Namoi Valley Map 2 WaterNSW
Part 1 - Overview of 2019/2020 • Rainfall and climate • Allocations and Usage • Restrictions • Supplementary access • 14 media releases relating to restrictions and extraction in northern valleys alone from 17 Jan to 25 Feb 2020 • https://www.waternsw.com.au/__data/assets/pdf_file/0009/145287/Operations- Update-Namoi-1-July.pdf • https://www.waternsw.com.au/__data/assets/pdf_file/0018/151641/191206- Operations-Update-Upper-Namoi.pdf • https://www.waternsw.com.au/about/newsroom/2020/324-temporary-pump- restrictions-for-northern-valleys 3 WaterNSW
Rainfall – last 24 months 4 WaterNSW
Rainfall – last 12 months 5 WaterNSW
Temperature – last 12 months 6 WaterNSW
Rainfall – last 3 months 7 WaterNSW
2019/20 Water Availability Upper Namoi https://waterregister.waternsw.com.au/water-register-frame 8 WaterNSW
2019/20 Water Availability Lower Namoi 9 WaterNSW
Northern Basin First Flush Event The 2020 Northern Basin First Flush Event: • Followed an extensive period of hot and dry conditions with record low rainfall and record low inflows • Included significant inflows from across the Northern Basin including the Border, Moonie, Gwydir, Namoi, Culgoa, • Bokhara, Macquarie, Bogan and Warrego systems. Involved a large number of Temporary Water Restrictions being placed on extractions in the Northern Basin. • Raised issues regarding communication and decision making processes. • Resulted in the appointment of an Independent Panel to assess the management of the event • https://www.industry.nsw.gov.au/water/allocations-availability/northern-basin-first-flush-assessment – Terms of Reference, consultation, Water User Reference Group – Final report with recommendations – end of August 2020 – Resulted in around 585 GL of inflow arriving into the Menindee Lakes system. • WaterNSW published regular Operations Updates throughout the event at https://www.waternsw.com.au/supply/regional-nsw/operations-updates A draft report is available at https://www.industry.nsw.gov.au/water/allocations-availability/northern-basin-first- flush-assessment A webinar will also be held on Monday 27 July from 1:00 to 2:30pm. Registration for the Webinar is required. 10 WaterNSW
Media releases • 17 Jan - https://www.waternsw.com.au/about/newsroom/2020/324-temporary- pump-restrictions-for-northern-valleys • 26 Jan - https://www.waternsw.com.au/about/newsroom/2020/pump-restrictions- lifted-for-peel-high-security-and-unregulated-use-on-mooki-and-quirindi-systems • 31 Jan - https://www.waternsw.com.au/about/newsroom/2020/324-pump- restrictions-extended-for-northern-valleys • 7 Feb - https://www.waternsw.com.au/about/newsroom/2020/temporary-rule- change-to-allow-some-stock-water-trade • 7 Feb - https://www.waternsw.com.au/about/newsroom/2020/temporary-pump- restriction-on-floodplain-harvesting • 10 Feb - https://www.waternsw.com.au/about/newsroom/2020/approval-to-take- under-temporary-water-restrictions-information • 11 Feb - https://www.waternsw.com.au/about/newsroom/2020/approval-to-take- under-temporary-water-restrictions-11-february • 11 Feb - https://www.waternsw.com.au/about/newsroom/2020/324-orders-on- floodplain-harvesting-in-the-northern-basin 11 WaterNSW
Media releases • 12 Feb - https://www.waternsw.com.au/about/newsroom/2020/amendment-to- temporary-pump-restriction-on-floodplain-harvesting • 12 Feb - https://www.waternsw.com.au/about/newsroom/2020/temporary- water-restriction-northern-nsw-murray-darling-basin-yarraman-creek-12- february-2020 • 13 Feb - https://www.waternsw.com.au/about/newsroom/2020/temporary- water-restrictions-on-river-and-overland-flows-in-the-northern-basin • 14 Feb - https://www.waternsw.com.au/about/newsroom/2020/324-pump- restrictions-extended-for-northern-valleys2 • 21 Feb - https://www.waternsw.com.au/about/newsroom/2020/barwon-darling- flows-a-blessing-for-towns,-farmers • 25 Feb - https://www.waternsw.com.au/about/newsroom/2020/324-pump- restrictions-lifted-in-namoi,-border-rivers 12 WaterNSW
Supplementary Access 19/20 Lower Namoi Supplementary Event 1 2019/2020 Event Volume calculations ML Narrabri Creek @ Narrabri 9/02/2020 to 7/03/2020 117422 Brigalow Creek inflow 9/02/2020 to 7/03/2020 2653 Total Flow 120075 Total Available Share 120075 less volume proir to trigger 94 less volume to fill weirs 0 less volume to meet Pian Creek repenishment 4700 D/S orders/requirements (riparian flows) 1783 less volume after cease 164 Available flow to be shared 113334 50% Consumptive share 56667 Volume Announced A 2452 Volume Announced B 0 Total Volume Announced 2452 Total Supplementary extracted 2452 Over Pumping debited to other accounts 0 Total Supplementary Pumping 2452 Percentage announced 2.2% Percentage extracted 2.2% Notes: 10 hours access for A Class Narrabri to Weeta. 48 hours access for A class Weeta to Walgett. No B class access. Up to 50% supplementary volume able to be extracted 1 November to 30 June Restrictions applied to event. 13 WaterNSW
Supplementary Access 19/20 Lower Namoi Supplementary Event 2 2019/2020 Event Volume calculations ML Bugilbone gauged inflow 12 March to 14 March 3016 Total Flow 3016 Total Available Share 3016 less volume proir to trigger 0 less volume to fill weirs 0 less volume to meet Pian Creek repenishment 0 D/S orders/requirements (riparian flows) 362 less volume after cease 0 Available flow to be shared 2654 50% Consumptive share 1327 Volume Announced A 1388 Volume Announced B 0 Total Volume Announced 1388 Total Supplementary extracted 1388 Over Pumping debited to other accounts 0 Total Supplementary Pumping 1388 Percentage announced 52.3% Percentage extracted 52.3% Notes: 8 hours access for A Class - Weeta to Walgett. No B class access. Up to 50% supplementary volume able to be extracted 1 November to 30 June 14 WaterNSW
Supplementary Access 19/20 Lower Namoi Supplementary Event 3 2019/2020 Event Volume calculations ML Narrabri Creek @ Narrabri 8 April to 17 April 7382 Ungauged inflow (positive AUD Weeta to Bullawa 12 to 16 April) 1437 Brigalow Creek inflow - gauged flow 11 April to 13 April 399 Total Flow 9218 9218 Total Available Share less volume prior to trigger 121 less volume to fill weirs 0 less volume to meet Pian Creek repenishment 0 D/S orders/requirements (incl riparian flows) 0 less volume after cease 286 Available flow to be shared 8811 50% Consumptive share 4406 Volume Announced A 4074 Volume Announced B 0 Total Volume Announced 4074 Total Supplementary extracted 4074 Over Pumping debited to other accounts 0 4074 Total Supplementary Pumping 46.2% Percentage announced 46.2% Percentage extracted Notes: Total 45 hours access for all A Class No B class access. Up to 50% supplementary volume able to be extracted 1 November to 30 June 15 WaterNSW
Supplementary Access 19/20 Lower Namoi Supplementary Event 4 2019/2020 Event Volume calculations ML Bugilbone gauged inflow 17 to 18 April 371 Total Flow 371 Total Available Share 371 less volume proir to trigger 0 less volume to fill weirs 0 less volume to meet Pian Creek repenishment 0 D/S orders/requirements (riparian flows) 0 less volume after cease 0 Available flow to be shared 371 50% Consumptive share 186 Volume Announced A 195 Volume Announced B 0 Total Volume Announced 195 Total Supplementary extracted 195 Over Pumping debited to other accounts 0 Total Supplementary Pumping 195 Percentage announced 52.6% Percentage extracted 52.6% Notes: 20 hours access for A Class - Bugilbone to Walgett. No B class access. Up to 50% supplementary volume able to be extracted 1 November to 30 June 16 WaterNSW
Part 2 - Current Situation • Drought Update • Drought Map • Inflows • WNSW Water Insights Portal 17 WaterNSW
WaterNSW
Regional drought map WaterNSW
Namoi Valley Inflows • Split Rock Dam inflows since Jan 2020 to end June 2020 have been 16GL • Just above 50 th %ile of 12.7GL • Split Rock Dam inflows since July 2018 to end June 2020 have been 20GL just above minimum of 11GL (95 th %ile is 24GL) 20 WaterNSW
Namoi Valley Inflows • Keepit Dam inflows since Jan 2020 to end June 2020 have been 61GL • In line with 50 th %ile inflows of 61.5GL • Downstream tributary flow has been approximately 105GL. • Keepit Dam inflows since July 2018 to end June 2020 have been 66.5GL(excluding BWT) just above minimum of 53GL • Downstream tributary flow for the 24 month period has been approximately 116GL. 21 WaterNSW
Water Insights • Storage levels • Inflows • Releases • Compare multiple years • Allocations • Outlook • more 22
Keepit & Split Rock Dam https://waterinsights.waternsw.com.au/11986-lower-namoi-regulated-river/updates 23 WaterNSW
Allocations (screen shots from WaterInsights) 24 WaterNSW
Part 3 – Outlook for 2020/2021 • Storage Forecasts • Climate outlook • Allocations • Operations • Projects 25 WaterNSW
Storage Forecast 26 WaterNSW
Storage Forecast 27 WaterNSW
Rainfall outlook August to October 28 WaterNSW
Rainfall outlook September to November 29 WaterNSW
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