Hunter Regulated Drought Presentation Singleton 27 February 2020 - PowerPoint PPT Presentation

Hunter Regulated Drought Presentation Singleton 27 February 2020

22 month rainfall deficiency WaterNSW

NSW temperatures WaterNSW

Soil moisture deficiencies January 2020 WaterNSW

Water Availability Red Number – water 29 available in accounts 160 17 Blue Number – water 51 available in storage 17 406 82 160 979 2,626 5 WaterNSW

Drought of Record – 24 Months Valley Previous Period Last 24 months Drought of Inflows Record Inflows (GL) (GL) Glen Lyon 7 1992-94 33 Pindari 45 1918-20 25 Copeton 53 1918-20 107 Keepit 57 2001-03 25 Split Rock 8 1956-58 7 Chaffey 13 1964-66 6 Burrendong 257 1936-38 68 Hunter 68 1939-41 24 6 WaterNSW

Drought of Record – 36 Months Valley Previous Drought Current Current Drought of Period Drought Drought Record Inflows Period Inflows Months (GL) (Yrs) (GL) (GL) Glen Lyon 44 1992-95 32 32 Pindari 142 1992-95 82 31 Copeton 218 1992-95 209 31 Keepit 157 1992-95 100 36 Split Rock 22 1925-28 21 36 Chaffey 26 1964-67 19 36 Burrendong 533 1937-40 153 36 Hunter 129 1939-42 49 36 7 WaterNSW

Current Storage Status Glenbawn: as at 25 Feb 2020 Storage Volume: 300,403 ML • Storage Percent: 40.1%, increase of 1% from 39.1% on • 1Feb Dam Inflows since 1July19 – 31 Jan 20: 1,000 ML • Dam Inflows since 1 Feb 20 – 25 Feb 20: 7,500 ML • Glennies: as at 25 Feb 2020 Storage Volume: 106,436 ML • Storage Percent: 37.3%, increase of 0.2% from 37.1% on • 1Feb Dam Inflows since 1July19 – 31 Jan 20: 500 ML • Dam Inflows since 1 Feb 20 – 25 Feb 20: 770 ML • WaterNSW

Current Storage Status Lostock: as at 25 Feb 2020 Storage Volume: 18,685 ML • Storage Percent: 92.4%, increase of 1% from 48.8% on • 1Feb Dam Inflows since 1 Feb 20 – 25 Feb 20: ~10,000 ML • WaterNSW

Historic Inflows Combined (Glenbawn and Glennies) Combined Inflows (ML) 900 800 700 600 Inflows (ML) 500 Median Inflows 161.4 GL/a 400 300 200 100 0 Year 10 WaterNSW

Hunter system inflows 500 Long Term Average Annual Inflows in to Hunter River 1,040 GL 450 400 350 300 Inflows (GL) 250 200 150 40 GL in Feb 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 Comb Dams Goulburn River 11 WaterNSW

Hunter River At Greta Total Annual Flows 1200000 1000000 800000 WSP Flow Target Flow (ML) 19,000ML/Yr 600000 WSP Flow Target Normal Conditions 12,000ML/Yr DRY 400000 condition 200000 0 Hunter River at Greta Total Flow 12 WaterNSW

Paterson system inflows 80 Long Term Average Annual Inflows 223 GL 70 60 50 Inflows(GL) 40 30 20 10 0 2014 2015 2016 2017 2018 2019 2020 Lostock dam Allyn River at Halton 13 WaterNSW

Paterson River At Gostwyk Total Annual Flows 500000 450000 400000 350000 Flow ML/d 300000 250000 200000 150000 100000 WSP Flow Target 6000ML 50000 0 2003/04 2004/05 2005/06 2006/07 2007/08 2008/09 2009/10 2010/11 2011/12 2012/13 2013/14 2014/15 2015/16 2016/17 2017/18 2018/19 2019/20 Paterson River at Gostwyk total flows 14 WaterNSW

Drought Inflow Comparison Comparison of Drought Inflows - Glenbawn & Glennies Ck Dams (Drought Inflows for 36 Months Starting in July) 250 July 1939 - Jun1942 July 1979 - Jun 1982 July 2015 - Jun 2018 July 2016 - June 2019 Current Drought July 2017 - Feb 2020 200 Cumulative Inflows in GL 150 100 50 0 0 6 12 18 24 30 36 No. of Months 15 WaterNSW

Resource Assessment 1 July 2019 Source of Water Distribution of Water 1 July 2019 - 30 June 2022 Unallocated water, 31 GL Storage Evap, 15 GL Usable Trib inflows, 102 GL Transmission & Ops Dam Loss, 150 GL GS allocations, 151 inflows 1 GL July 19 to June 22, 129 GL 762 GL LWU and S&D and Combin BLR, 54 GL ed Operational Target dams Flows, 97 GL on 1 July 2019, 532 GL Major Utility, 140 GL EWA, 60 GL HS, 65 GL 16 WaterNSW

Scenario 1- Continuation of Drought 17 WaterNSW

Storage Depletion Curve 18 WaterNSW

Lostock Dam Storage status 120% 100% 80% Storgae Capacity % 60% 40% 20% 0% 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun 2015/16 2016/17 2017/18 2018/19 2019/20 19 WaterNSW

Climate Outlook WaterNSW