Hunter Roscco
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Hunter River - ROSCCo (River Operations Stakeholder Consultative Committee) 10 March 2021 Mahmood Khan Water Systems Operations Supervisor - Central Recent Rainfall WaterNSW 2 Rainfall in relation to average 3 WaterNSW Glenbawn Operations 2020-21 Glenbawn Dam Operations 2020-21 2000 100% 1800 90% 1600 80% 1400 70% 1200 60% 1000 50% Flow Flow (ML/d) 800 40% Storage Level (%) 600 30% 400 20% 200 10% 0 0% Inflows Glenbawn Release Glenbawn Storage Level 4 WaterNSW Glennies Ck Operations 2020-21 Glennies Ck Dam Operations 2020-21 500 100% 450 90% 400 80% 350 70% 300 60% 250 50% Flow Flow (ML/d) 200 40% Storage Level (%) 150 30% 100 20% 50 10% 0 0% Inflows Glennies Ck Release Glennies Ck Storage Level 5 WaterNSW Recent d/s flows Supp and Salt event Supp and Salt Supp and Salt event event Supp and Salt Supp and Salt event event Supp and UCF 6 WaterNSW Current Storage Status Glenbawn: 9 March 2021 • Storage Volume: 380,571ML • Storage Percent: 50.8% • Dam Inflows since 1July20 – 28 Feb 21: ~97,000 ML Glennies Creek: 9 March 2021 • Storage Volume: 132,479ML • Storage Percent: 46.5% • Dam Inflows since 1July20 – 28 Feb 21: ~27,000 ML Lostock : 9 March 2021 • Storage Volume: 20,318ML • Storage Percent: 100.6% • Currently Spilling 7 WaterNSW Hunter system inflows 500 450 400 350 300 250 Long Term Average Annual Inflows 1,040 GL Inflows(GL) 200 150 100 GL Feb-May 100 50 0 2009-10 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 Comb Dams Goulburn River 8 WaterNSW Inflows (GL) 100 200 300 400 500 600 700 800 900 0 ( Combined Historic Inflows 9 1894 Glenbawn WaterNSW 1897 1900 1903 1906 1909 1912 1915 1918 1921 Median Inflows Median 1924 and 1927 1930 1933 1936 1939 Glennies 1942 (GL) Inflows Combined 1945 1948 1951 1954 Year 1957 1960 1963 ) 1966 1969 1972 1975 1978 1981 1984 1987 1990 1993 1996 1999 2002 2005 2008 2011 2014 2017 2020 Drought Inflow Comparison Comparison of Drought Inflows - Glenbawn & Glennies Ck Dams (Drought Inflows for 42 Months Starting in July) 400 July 1939 - Jun1942 July 1979 - Jun 1982 July 2015 - Jun 2018 July 2016 - June 2019 Current Drought July 2017 - Feb 2021 350 300 250 200 150 Cumulative Inflows GL in 100 50 0 0 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 38 40 42 44 46 No. of Months 10 WaterNSW Flow (GL) 1000 100 200 300 400 500 600 700 800 900 Statistical Vs Actual Inflows 11 0 WaterNSW July August September October November December January February Observed inflows March April May June 2017 July from Months 44 Inflows Combined July August September Wet 20% Wet October November December January February Median 50% Median March April May June July Dry 80% Dry August September October November December Minimum 99% Minimum January February March April May June July August September October November December January February Hunter River At Greta Total Annual Flows 1,200,000 1,000,000 800,000 600,000 Flow (ML) 400,000 WSP Flow Target WSP Flow Target 12,000ML DRY 19,000ML Normal condition 200,000 Conditions 0 Hunter River at Greta Total Flow 12 WaterNSW Paterson system inflows 120 100 80 Long Term Average Annual Inflows 223 GL 60 Inflows(GL) 40 20 0 2014-15 2015-16 2016-17 2017-18 2018-19 2019-20 2020-21 Lostock dam Allyn River at Halton 13 WaterNSW Water Allocation Summary 1 July 20: • 100% AWD to S&D, LWU, MWU • 90% to Regulated HS • 30% to Regulated GS • 100% to Supplementary August 20: – Further increase in AWD to HS and GS • 10% to Regulated HS, Total HS = 100% • 23% to Regulated GS, Total GS = 53% November 20: Further increase in AWD to GS • 5% to Regulated GS, Total GS = 58% December 20: Further increase in AWD to GS by 4%, Total = 62% January 21: Further increase in AWD to GS by 13%, Total = 75% February 21: • Further increase in AWD to GS by 22%, Total = 97% 14 WaterNSW Account Balance - Hunter 1 March 2021 Sum of Sum of Sum of Sum of Sum of Sum of Sum of Share Sum of Allocation Allocation Sum of Licence Category Account Available Carryover UCF Component AWD Vol Assignments Assignments Usage Balance Water In Usage In Out - DOMESTIC AND STOCK 1,569 1,518 1,518 1,569 21 - - 30 - DOMESTIC AND STOCK [DOMESTIC] 146 142 142 146 - - - 4 - DOMESTIC AND STOCK [STOCK] 103 102 102 103 - - - 1 - LOCAL WATER UTILITY 10,832 7,471 7,239 10,832 - - - 3,362 - MAJOR UTILITY [POWER GENERATION] 36,000 64,087 64,087 36,000 32,264 - - 4,178 - REGULATED RIVER (GENERAL SECURITY) 128,544 140,475 140,328 124,692 30,812 1,743 1,643 16,823 1,694 REGULATED RIVER (HIGH SECURITY) 21,740 18,498 18,489 21,740 4,314 36 136 3,707 - SUPPLEMENTARY WATER 48,519 11,771 11,771 48,519 - 50 50 36,749 36,749 Grand Total 247,453 244,062 243,675 243,600 67,369 1,829 1,829 64,852 38,443 15 WaterNSW Account Balance - Paterson 1 March 2021 Sum of Sum of Sum of Sum of Sum of Sum of Allocation Allocation Share Account Available Sum of Carryover Assignments Assignments Sum of Licence Category Component Balance Water AWD Vol In In Out Usage DOMESTIC AND STOCK 42 42 42 42 - - - - DOMESTIC AND STOCK [DOMESTIC] 2 2 2 2 - - - - DOMESTIC AND STOCK [STOCK] 5 5 5 5 - - - - REGULATED RIVER (GENERAL SECURITY) 9,565 9,842 9,611 9,545 756 - - 459 - REGULATED RIVER (HIGH SECURITY) 190 72 72 190 118 - - - REGULATED RIVER (HIGH SECURITY) [TOWN WATER SUPPLY] 75 41 16 75 - - - 34 SUPPLEMENTARY WATER 756 756 756 756 - - - - Grand Total 10,635 10,760 10,504 10,615 638 - - 493 16 WaterNSW Current Resource Situation 1 Feb 2021 Distribution of Water 1 Feb 2021 - 30 June 2023 Source of Water Available for Allocation / Shortfall, Usable Trib 28 GL inflows 1 Storage Evap, 8 GL Jul 20 to June 23, 68 GL Transmission & Ops Dam Loss, 117 GL inflows 1 Jul 20 to GS allocations, 116 GL June 23, 71 GL LWU and S&D and BLR, 634 GL 48 GL Operational Target Combined Flows, 65 GL dams on 1 Jul 20, 496 GL Major Utility, 140 GL EWA, 60 GL 606 GL HS, 53 GL 22% GS AWD was announced 17 WaterNSW Climate Outlook Mar 21 to May 21 Mar 21 to May 21 ENSO will return to neutral during autumn; that is, neither La Niña nor El Niño. 18 Discussion • Current usage and water requirements. • Normal Water Operations in 20-21 • Measures required to be taken in 21-22 to get through to June 22. • Placing Water Orders • General discussion 19 WaterNSW Water Insights Portal • https://waterinsights.waternsw.com.au/ 20 To keep updated Visit the website at: waternsw.com.au/drought For drought related information including water availability reports and drought reports go to: https://www.waternsw.com.au/supply/drought- information/regional-nsw Call us on: 1300 662 077 Subscribe at: waternsw.com.au/subscribe For weekly customer drought updates and more information 21 WaterNSW Thank you for joining us today 22 WaterNSW.