Peel Regulated ROSCCo (River Operations Stakeholder Consultation - - PowerPoint PPT Presentation

10 June 2020

Peel Regulated ROSCCo

(River Operations Stakeholder Consultation Committee)

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Peel Valley Map

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Rainfall – last 24 months

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• Rainfall and climate
• Allocations and Usage
• Community Consultation meetings
• Completion of Drought Projects

– Construction of Dungowan Temporary Weir – Construction of Chaffey to Dungowan Pipeline

• Restrictions applied

– https://www.waternsw.com.au/__data/assets/pdf_file/0004/153985/200219- Operations-Update-No-uncontolled-flow-access-for-Peel-UNamoi.pdf – https://www.waternsw.com.au/__data/assets/pdf_file/0008/153656/Peel- Namoi-Operations-Update-HS-Restrictions-removed-10-February.pdf

• Access to Uncontrolled Flows for General Security licences

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Part 1 - Overview of 2019/2020

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Rainfall – last 12 months

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Temperature – last 12 months

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Rainfall – last 3 months

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Soil Moisture

August 2019 April 2020

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2019/20 Water Allocation

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https://waterregister.water nsw.com.au/water- register-frame

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2019/20 Water Availability

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• Drought Update

– Peel the only valley in NSW remaining on level 4 under the State Government’s Extreme Events policy

• Drought Map
• Peel Valley Inflows
• WNSW Water Insights Portal

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Part 2 - Current Situation

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Regional drought map

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• Chaffey Dam inflows since July 2018 to the end of April have been 7.4GL
• About half of the previous record from the 1960s
• Downstream tributary inflows since July 2018 to the end of April have been

56.9GL – 51.6GL of this occurred in February, March and April 2020

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Peel Valley Inflows

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• https://waterinsights.waternsw.com.au/15101-peel-regulated-river-water-

source/storage

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Chaffey Dam

Water Insights

• Storage levels
• Inflows
• Releases
• Compare

multiple years

• Allocations
• Outlook
• more

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• Storage Depletion Curve
• Climate outlook
• Allocations

– Expect them to be similar to this year

• Operations
• Projects

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Part 3 – Outlook for 2020/2021

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Storage Depletion Curve

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Rainfall outlook June to August

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Rainfall outlook July to September

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• Delivery of water only to Council
• Environmental releases from Chaffey Dam will be in accordance with applicable rules

and approvals – WSP rules (3ML/day minimum release rule currently suspended) – Environmental Approvals for the Temporary Weir at Dungowan (30ML/week) – Environmental Approvals for the Operation of the Chaffey to Dungowan Pipeline

• Proposed rules – currently being finalised
• Accrual of Environmental water
• Environmental Water Technical Advisory Group required under the approval. Note

that this is different to any requirements under the WSP.

• Allocations for 2020/2021 are likely to be similar to allocations at the start of 2019/2020

– High Security and Stock & Domestic licences will be able to access flows in the river, however releases from Chaffey will not be made to meet these needs – General Security licences will be able to access water when uncontrolled flow announcements apply. Orders must still be placed

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Operations 2020/2021

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• $2000 Water Carting rebate

available through Service NSW

• https://www.service.nsw.gov.au

/transaction/apply-water- carting-rebate

• helps with the cost of carting

water or installing water tanks and pipes

• to help secure domestic water

needs

• currently available in the Peel

downstream of Dungowan

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Water Carting Rebate

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• Chaffey to Dungowan Pipeline Update

– Construction and commissioning completed – Awaiting final confirmation on approvals from relevant government authorities

• New Dungowan Dam and Pipeline Update

– https://www.waternsw.com.au/projects/new-dams-for-nsw/dungowan-dam

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Projects - Discussion Points

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Groundwater Status Information-Peel Alluvium Groundwater Source

GROUNDWATER RESOURCE STATUS INFORMATION

• Peel Alluvium

Groundwater Sources

• This presentation is an initiative by

WaterNSW to gather groundwater resource status information for various groundwater sources in NSW

Part 4 – Groundwater (a snapshot)

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• Fractured rock aquifer system

composed mainly of mafic volcanic, plutonic and metamorphic rocks

• Largely unexplored

– In any of the slides, the text area can also contain other content. – You will notice under the “Click to enter text” line are icons displaying

• ptions to inegraphs, pictures, Excel

tables etc.

25 Groundwater Status Information-Peel Alluvium Groundwater Source

Geology

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Groundwater Status Information-Peel Alluvium Groundwater Source

Aquifer Details and Hydrogeology

(Cross Section)

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• Groundwater

level record commenced since 2000

• Groundwater

level Influenced by climate

• Declining trend

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Groundwater Status Information-Peel Alluvium Groundwater Source

Groundwater Water level Trend

0.00 1.00 2.00 3.00 4.00 5.00 6.00 7.00

May-00 May-01 May-02 May-03 May-04 May-05 May-06 May-07 May-08 May-09 May-10 May-11 May-12 May-13 May-14 May-15 May-16 May-17 May-18 May-19 May-20

Depth to Wate Table (m) Time

Peel Alluvium Groundwater Hydrograph GW093044 Near Tamworth

GW093044 Peel Alluvium Near Tamworth

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• The Peel Alluvium GW

aquifer is highly connected with the Peel River

• Flowing River loses

water to the aquifer because of the flow gradient created by GW pumping

• When River stops

flowing, the aquifer starts losing in the stream creating pools

• f water

Stream Aquifer Interactions

Groundwater Status Information-Peel Alluvium Groundwater Source

Schematic Diagram of losing stream

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Visit the website at:

waternsw.com.au/drought

For information on the Peel Valley including water availability reports and drought reports go to: waternsw.com.au/supply/drought-information/regional- nsw/peel-valley Call us on:

1300 662 077

Subscribe at:

waternsw.com.au/subscribe

For weekly customer drought updates and more information

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To keep updated

WaterNSW

End of Presentation