Groundwater Gunnedah Basin NSW What water information can tell us - - PowerPoint PPT Presentation

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Feb 13, 2024 126 likes •345 views

Groundwater Gunnedah Basin NSW What water information can tell us Sedimentary basins in NSW that contain coal NSW cross sections Section through both the Gunnedah and Clarence Moreton Basins Cross Section B Distribution of groundwater extraction

SLIDE 1

Groundwater

Gunnedah Basin NSW

What water information can tell us

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Sedimentary basins in NSW that contain coal

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NSW cross sections

SLIDE 4

Section through both the Gunnedah and Clarence Moreton Basins

Cross Section B

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Distribution of groundwater extraction

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Gunnedah Basin: Distribution and purpose of groundwater rights

Total rights ~ 340 GL

Upper and Lower Namoi Alluvial Water Sources (~215 GL/yr) NSW MDB Porous Rock Groundwater Source (Gunnedah Oxley Basin) (~22 GL/yr) Lower Gwydir Alluvial Water Source (~28 GL/yr) Other alluvial (total) (~4 GL/yr) Macquarie and Bogan Alluvial Groundwater Sources (~22 GL/yr) Great Artesian Basin (total) (~35 GL/yr) NSW MDB Fractured Rock Water Sources (basalt) (~3 GL/yr)

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Gunnedah Basin: Areas of Permian outcrop

Cross Section 1 Cross Section 2

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GunnedahBasin: vertical distribution of groundwater rights

~3,500 stock and domestic ~150 high yield ~4,500 stock and domestic ~1,500 high yield ~3,500 stock and domestic ~200 high yield Approximately 850 gas wells proposed

Total rights 340 GL Cross Section 1

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Gunnedah Basin: Cross section (south western basin)

Cross Section 2

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Available water in and overlying the Gunnedah Basin

500 1,000 1,500 2,000 2,500 3,000 Groundwater Surface water Water available (GL/yr) Environmental Unassigned water Current rights

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100 200 300 400 500 600 700 800 900 1,000

Alluvial Great Artesian Basin Gunnedah Basin Fractured Basalts Namoi Regulated River Gwydir Regulated River Macquarie and Cudgegong Regulated Border Rivers ‐ Regulated Unregulated rivers

Water available (Gl/yr) Environmental Unassigned water Current rights

Available water in and overlying the Gunnedah Basin

Surface water Groundwater

Note: Environmental water in groundwater systems in this chart does not include storage, which in the Gunnedah Basin is approximately 8,000,000 GL

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CSG Narrabri Project average

take estimated at 2 GL/yr. This represents:

1.8% of the porous rock

extraction limit

Licences have to be
btained

GunnedahBasin Groundwater Regional volumetric risk quantified

Average long term annual volume from the Gunnedah Oxley Basin porous rock required by Santos at Narrabri

1.8%

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GunnedahBasin: Groundwater monitoring sites

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Monitoring of 65 sites since the early 1970s

Baseline water level data ‐ Lower Gwydir

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Groundwater level monitoring ‐ GAB

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Baseline water level data ‐ Gunnedah Basin

Monitoring ~ 10 bores in the Gunnedah Basin – Spring Ridge area since late 1970s

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Groundwater level monitoring ‐ CastlereaghAlluvium

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Relative comparison of basin size

Gloucester Basin Clarence Moreton Basin Gunnedah Basin Murray Basin