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

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

Aug 10, 2023 390 likes •603 views

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

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Singleton 27 February 2020

Hunter Regulated Drought Presentation

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WaterNSW

22 month rainfall deficiency

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WaterNSW

NSW temperatures

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WaterNSW

Soil moisture deficiencies

January 2020

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WaterNSW 5

29 160 51 17 17

82 979 2,626 160

Water Availability

Red Number – water available in accounts Blue Number – water available in storage

406

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WaterNSW

Drought of Record – 24 Months

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Valley Previous Drought of Record Inflows (GL) Period Last 24 months Inflows (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

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WaterNSW 7

Valley Previous Drought of Record Inflows (GL) Drought Period (Yrs) Current Drought Inflows (GL) Current Drought Period Months (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

Drought of Record – 36 Months

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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
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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
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WaterNSW 10

Historic Inflows Combined (Glenbawn and Glennies)

100 200 300 400 500 600 700 800 900

Inflows (ML) Year

Combined Inflows (ML)

Median Inflows 161.4 GL/a

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WaterNSW 11

Hunter system inflows

50 100 150 200 250 300 350 400 450 500 2009-10 2010-11 2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18 2018-19 2019-20

Inflows (GL)

Comb Dams Goulburn River

40 GL in Feb

Long Term Average Annual Inflows in to Hunter River 1,040 GL

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WaterNSW 12

Hunter River At Greta Total Annual Flows

200000 400000 600000 800000 1000000 1200000

Flow (ML)

Hunter River at Greta Total Flow

WSP Flow Target 19,000ML/Yr Normal Conditions WSP Flow Target 12,000ML/Yr DRY condition

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WaterNSW 13

Paterson system inflows

10 20 30 40 50 60 70 80 2014 2015 2016 2017 2018 2019 2020

Inflows(GL)

Lostock dam Allyn River at Halton

Long Term Average Annual Inflows 223 GL

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WaterNSW 14

Paterson River At Gostwyk Total Annual Flows

50000 100000 150000 200000 250000 300000 350000 400000 450000 500000 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

Flow ML/d

Paterson River at Gostwyk total flows WSP Flow Target 6000ML

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WaterNSW 15

Drought Inflow Comparison

50 100 150 200 250 6 12 18 24 30 36 Cumulative Inflows in GL

  • No. of Months

Comparison of Drought Inflows - Glenbawn & Glennies Ck Dams (Drought Inflows for 36 Months

Starting in July)

July 1939 - Jun1942 July 1979 - Jun 1982 July 2015 - Jun 2018 July 2016 - June 2019 Current Drought July 2017 - Feb 2020

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WaterNSW 16

Resource Assessment 1 July 2019

Storage Evap, 15 GL Transmission & Ops Loss, 150 GL LWU and S&D and BLR, 54 GL Major Utility, 140 GL HS, 65 GL EWA, 60 GL Operational Target Flows, 97 GL GS allocations, 151 GL Unallocated water, 31 GL

Distribution of Water 1 July 2019 - 30 June 2022

Combin ed dams

  • n 1

July 2019, 532 GL

Dam inflows 1 July 19 to June 22, 129 GL Usable Trib inflows, 102 GL

Source of Water

762 GL

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WaterNSW 17

Scenario 1- Continuation of Drought

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WaterNSW 18

Storage Depletion Curve

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WaterNSW 19

Lostock Dam Storage status

0% 20% 40% 60% 80% 100% 120% 1-Jul 1-Aug 1-Sep 1-Oct 1-Nov 1-Dec 1-Jan 1-Feb 1-Mar 1-Apr 1-May 1-Jun

Storgae Capacity %

2015/16 2016/17 2017/18 2018/19 2019/20

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WaterNSW

Climate Outlook