Groundwater management and the impact of drought · Groundwater management and the impact of...
Transcript of Groundwater management and the impact of drought · Groundwater management and the impact of...
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COMMUNITY DROUGHT INFORMATION SESSIONS, MAY AND JUNE 2019
Groundwater management and the impact of drought—major inland alluvial water sources
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Groundwater management
• Aquifers store large volumes of water
• Long-term extraction = Long-term recharge
• High use due to a long-term dry period can lead to restrictions on use
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Water sharing plan rules
• Extraction and distance restrictions to manage local impacts
• Require new basic landholder rights bores to be drilled to sufficient depth to maintain long-term access
• Specify accounting rules—set maximum carryover, annual account limits
• Set trading rules—where and how much water can be traded between connected aquifers
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Dry conditions since 2017 are affecting water resources
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Groundwater sources—extreme event stages
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• No groundwater sources in NSW have reached drought stage 2
• We continue to use normal rules
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How does drought affect groundwater resources?
• Groundwater is more drought-resilient than surface water
• Larger groundwater systems have higher buffer due to storage
• Stress comes from substituting from surface water supply, plus reduced recharge
• In drought-affected areas, the water levels in most monitoring bores are at below-average levels, corresponding with increased extraction and reduced recharge
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Increasing bore applications and groundwater trades
Substantial increase in applications for basic landholder right bores and for trade of groundwater allocations and aquifer access licences
All applications are assessed:
• extraction impact assessments—based on risk management approach
• hydrogeological assessment considers:
• impact on aquifer
• impact on other users—licensed & basic landholder rights
• impact on environment—groundwater dependent ecosystems and river
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Possible management options in response to declines in groundwater
• Reduced allocations in those systems that have exceeded the long term extraction limit for more than three years (or 5 years in some water sources)
• Section 324 (2) orders:
If it is necessary :
(a) to maintain or protect water levels in an aquifer,
(b) to maintain, protect or improve the quality of water in an aquifer,
(c) to prevent land subsidence or compaction in an aquifer,
(d) to protect groundwater-dependent ecosystems,
(e) to maintain pressure, or to ensure pressure recovery, in an aquifer,
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Possible management options in response to declines in groundwater, continued
within a specified area and for a specified period, the taking of water from that aquifer, or from any other aquifer that is above, below or adjacent to that aquifer, can be prohibited, or is subject to restrictions.
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Monitoring bores in NSW
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Groundwater levels—schematic hydrograph
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Major inland alluvial groundwater sources
Rainfall, usage, hydrographs
1. Border Rivers
2. Lower Gwydir
3. Peel
4. Upper Namoi
5. Lower Namoi
6. Upper Macquarie
7. Lower Macquarie
8. Belubula
9. Upper Lachlan
10. Lower Lachlan
11. Lower Murrumbidgee
12. Upper Murray
13. Lower Murray
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1. Border Rivers alluvium
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Rainfall deviation from average
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Texas Post Office Goondiwindi Post Office and Airport
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Yearly groundwater take
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NSW Border Rivers Alluvium
Annual Extraction Pre WSP Annual Extraction Pre WSP Yearly Extraction Limit
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Yearly groundwater take
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Annual Extraction Pre WSP Annual Extraction Pre WSP Yearly Extraction Limit
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Hydrograph—upstream of Texas– Upstream of Texas
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Wate
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GW0040644 - Pipe 1: 9.9m deep, open ended GW040641 - Pipe 1: 31.4m - 48.1m
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Hydrograph—downstream of Texas
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GW040829 - Pipe 1: 8m - 11m GW040829 - Pipe 2: 18m - 24m GW040831 - Pipe 1: 36m - 41m GW040831 - Pipe 2: 72m - 78m
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Hydrograph—downstream of Keetah Bridge
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GW036684 - Pipe 1: 18m - 26m GW036684 - Pipe 2: 29m - 35m
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Hydrograph—Macintyre alluvium
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GW036685 - Pipe 1: 12m - 13.5m
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Hydrograph—Ottleys alluvium
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GW036692 - Pipe 1: 11m - 13m GW036692 - Pipe 2: 32m - 34m
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2. Lower Gwydir alluvium
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Rainfall deviation from average—Moree
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Yearly groundwater take—Gwydir alluvium
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Yearly Extraction Limit
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Hydrograph – GW030390
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Water E
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Water L
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GW030390
GW030390 - Hole 1, Pipe 1; Screen: 17.7 - 20.7 m GW030390 - Hole 1, Pipe 2; Screen: 50.6 - 53.6 m
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Hydrograph—GW030159
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GW030159
GW030159 - Hole 1, Pipe 1; Screen: 9.9 - 11.3 m GW030159 - Hole 1, Pipe 2; Screen: 36.0 - 40.0 m
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Hydrograph—GW030458
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GW030458 - Hole 1, Pipe 1; Screen: 10.7 - 16.8 m GW030458 - Hole 1, Pipe 2; Screen: 49.2 - 50.5 m GW030458 - Hole 1, Pipe 3; Screen: 65.4 - 68.9 m
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Hydrograph—GW036115
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l-8
2
Ju
l-8
3
Ju
l-8
4
Ju
l-8
5
Ju
l-8
6
Ju
l-8
7
Ju
l-8
8
Ju
l-8
9
Ju
l-9
0
Ju
l-9
1
Ju
l-9
2
Ju
l-9
3
Ju
l-9
4
Ju
l-9
5
Ju
l-9
6
Ju
l-9
7
Ju
l-9
8
Ju
l-9
9
Ju
l-0
0
Ju
l-0
1
Ju
l-0
2
Ju
l-0
3
Ju
l-0
4
Ju
l-0
5
Ju
l-0
6
Ju
l-0
7
Ju
l-0
8
Ju
l-0
9
Ju
l-1
0
Ju
l-1
1
Ju
l-1
2
Ju
l-1
3
Ju
l-1
4
Ju
l-1
5
Ju
l-1
6
Ju
l-1
7
Ju
l-1
8
Ju
l-1
9
Wate
r E
levation (m
AH
D)
Wate
r L
evel (m
belo
w G
L)
GW036115
GW036115 - Hole 1, Pipe 1; Screen: 18.0 - 19.5 m GW036115 - Hole 1, Pipe 2; Screen: 38.5 - 41.5 m GW036115 - Hole 1, Pipe 3; Screen: 59.0 - 62.0 m
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Hydrograph—GW036161
Page 29
89
99
109
119
129
139
149
159
169
17902468
10121416182022242628303234363840
Ju
l-7
3
Ju
l-7
4
Ju
l-7
5
Ju
l-7
6
Ju
l-7
7
Ju
l-7
8
Ju
l-7
9
Ju
l-8
0
Ju
l-8
1
Ju
l-8
2
Ju
l-8
3
Ju
l-8
4
Ju
l-8
5
Ju
l-8
6
Ju
l-8
7
Ju
l-8
8
Ju
l-8
9
Ju
l-9
0
Ju
l-9
1
Ju
l-9
2
Ju
l-9
3
Ju
l-9
4
Ju
l-9
5
Ju
l-9
6
Ju
l-9
7
Ju
l-9
8
Ju
l-9
9
Ju
l-0
0
Ju
l-0
1
Ju
l-0
2
Ju
l-0
3
Ju
l-0
4
Ju
l-0
5
Ju
l-0
6
Ju
l-0
7
Ju
l-0
8
Ju
l-0
9
Ju
l-1
0
Ju
l-1
1
Ju
l-1
2
Ju
l-1
3
Ju
l-1
4
Ju
l-1
5
Ju
l-1
6
Ju
l-1
7
Ju
l-1
8
Ju
l-1
9
Wa
ter E
leva
tio
n (m
AH
D)
Wa
ter L
eve
l (m
be
low
G
L)
GW036161
GW036161 - Hole 1, Pipe 1; Screen: 39.2 - 41.7 m GW036161 - Hole 1, Pipe 2; Screen: 48.5 - 50.0 m GW036161 - Hole 1, Pipe 3; Screen: 61.0 - 62.2 m
![Page 30: Groundwater management and the impact of drought · Groundwater management and the impact of drought—major inland alluvial water sources . Groundwater management • Aquifers store](https://reader034.fdocuments.us/reader034/viewer/2022042810/5f9c1e01b24dc35c255924d3/html5/thumbnails/30.jpg)
3. Peel Valley alluvium
Page 30
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Rainfall deviation from average
Page 31
-1200
-800
-400
0
400
800
120019
67
19
69
19
71
19
73
19
75
19
77
19
79
19
81
19
83
19
85
19
87
19
89
19
91
19
93
19
95
19
97
19
99
20
01
20
03
20
05
20
07
20
09
20
11
20
13
20
15
20
17
20
19
20
21
Rain
fall R
esid
ual
Mass
Year
Tamworth
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Yearly groundwater take—Peel Valley
Page 32
0
2000
4000
6000
8000
10000
12000
1992-9
1
1992-9
3
1993-9
4
1994-9
5
1995-9
6
1996-9
7
1997-9
8
1998-9
9
1999-0
0
2000-0
1
2001-0
2
2002-0
3
2003-0
4
2004-0
5
2005-0
6
2006-0
7
2007-0
8
2008-0
9
2009-1
0
2010-1
1
2011-1
2
2012-1
3
2013-1
4
2014-1
5
2015-1
6
2016-1
7
2017-1
8
Us
ag
e V
olu
me
(M
L)
Annual Extraction Pre WSP Annual Extraction Post WSP
Yearly Extraction Limit
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Hydrograph—GW030136
Page 33
364
365
366
367
368
369
370
371
372
373
3740
2
4
6
8
10
Jul-
71
Jul-
72
Jul-
73
Jul-
74
Jul-
75
Jul-
76
Jul-
77
Jul-
78
Jul-
79
Jul-
80
Jul-
81
Jul-
82
Jul-
83
Jul-
84
Jul-
85
Jul-
86
Jul-
87
Jul-
88
Jul-
89
Jul-
90
Jul-
91
Jul-
92
Jul-
93
Jul-
94
Jul-
95
Jul-
96
Jul-
97
Jul-
98
Jul-
99
Jul-
00
Jul-
01
Jul-
02
Jul-
03
Jul-
04
Jul-
05
Jul-
06
Jul-
07
Jul-
08
Jul-
09
Jul-
10
Jul-
11
Jul-
12
Jul-
13
Jul-
14
Jul-
15
Jul-
16
Jul-
17
Jul-
18
Jul-
19
Wate
r E
leva
tio
n
(m
A
HD
)
Wate
r Level
(m
belo
w G
L)
GW030136
GW030136 - Hole 1, Pipe 1: Screen: 8.23 - 9.61 m
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Hydrograph—GW093039
Page 34
407
408
409
410
411
412
413
414
415
416
4170
2
4
6
8
10
Jul-
71
Jul-
72
Jul-
73
Jul-
74
Jul-
75
Jul-
76
Jul-
77
Jul-
78
Jul-
79
Jul-
80
Jul-
81
Jul-
82
Jul-
83
Jul-
84
Jul-
85
Jul-
86
Jul-
87
Jul-
88
Jul-
89
Jul-
90
Jul-
91
Jul-
92
Jul-
93
Jul-
94
Jul-
95
Jul-
96
Jul-
97
Jul-
98
Jul-
99
Jul-
00
Jul-
01
Jul-
02
Jul-
03
Jul-
04
Jul-
05
Jul-
06
Jul-
07
Jul-
08
Jul-
09
Jul-
10
Jul-
11
Jul-
12
Jul-
13
Jul-
14
Jul-
15
Jul-
16
Jul-
17
Jul-
18
Jul-
19
Wate
r E
leva
tio
n
(m
A
HD
)
Wate
r Level
(m
belo
w G
L)
GW093039
GW093039 - Hole 1, Pipe 1: Screen: 12.5 - 15.5 m
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4. Upper Namoi alluvium
Page 35
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Cumulative difference from average rainfall
Page 36
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Yearly groundwater take—Upper Namoi
Page 37
Upper Namoi Total
Lower Namoi
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Compliance with the extraction limits
Page 38
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Sites GW030029 and GW030083
Page 39
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Page 40
Sites GW036976 and GW030344
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Page 41
Sites GW036600 and GW036005
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5. Lower Namoi alluvium
Page 42
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Cumulative difference from average rainfall
Page 43
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Compliance with the extraction limits
Page 44
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Yearly groundwater take—Lower Namoi
Page 45
Upper Namoi Total
Lower Namoi
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Page 46
Sites GW025045 and GW036249
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6. Upper Macquarie
Page 47
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Rainfall deviation from average—south of Dubbo
Page 48
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Yearly groundwater take—Upper Macquarie
Page 49
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Hydrograph—GW021498
Page 50
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Hydrograph—GW036517
Page 51
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7. Lower Macquarie alluvium
Page 52
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Rainfall deviation from average—Trangie
Page 53
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Yearly groundwater take, Lower Macquarie combined, Zones 1–6
Page 54
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Hydrograph—GW039068
Page 55
40% = 56 mbgl
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Hydrograph—GW096144
Page 56
40% = 86 mbgl
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8. Belubula alluvium
Page 57
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Rainfall deviation from average
Page 58
-1000
-800
-600
-400
-200
0
200
400
600
800
1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020
Rain
fall
Resid
ual M
ass
Hillston Airport Forbes Airport
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Yearly groundwater take—Belubula alluvium
Page 59
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Hydrograph—Belubula—GW090014
Page 60
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9. Upper Lachlan alluvium
Page 61
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Rainfall deviation from average
Page 62
-1000
-800
-600
-400
-200
0
200
400
600
800
1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020
Rain
fall
Resid
ual M
ass
Hillston Airport Forbes Airport
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Yearly groundwater take—Upper Lachlan alluvium
Page 63
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Hydrograph—Upper Lachlan GW030367
Page 64
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Hydrograph—Upper Lachlan GW036526
Page 65
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Hydrograph—Upper Lachlan GW036553
Page 66
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10. Lower Lachlan
Page 67
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Rainfall deviation from average
Page 68
-1000
-800
-600
-400
-200
0
200
400
600
800
1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020
Rain
fall
Resid
ual M
ass
Hillston Airport Forbes Airport
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Yearly groundwater take—Lower Lachlan alluvium
Page 69
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Hydrograph—Lower Lachlan GW025401
Page 70
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Hydrograph—Lower Lachlan GW030174
Page 71
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Hydrograph—Lower Lachlan GW030405
Page 72
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11. Lower Murrumbidgee
Page 73
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Rainfall deviation from average
Page 74
-600
-400
-200
0
200
400
600
800
1000
1200
1400
1972 1976 1980 1984 1988 1992 1996 2000 2004 2008 2012 2016 2020
Rain
fall
Resid
ual M
ass
Yanco Hay
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Yearly groundwater take—Lower Murrumbidgee
Page 75
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Yearly groundwater take—Lower Murrumbidgee (shallow)
Page 76
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Hydrograph—GW040862
Page 77
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Hydrograph—GW040863
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Hydrograph—GW036025
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Hydrograph—GW036799
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Location of local management zones for Lower Murrumbidgee
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12. Upper Murray alluvium
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Rainfall deviation from average
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-800
-600
-400
-200
0
200
400
600
800
1000
1200
Jan
-7
5
Jan
-8
0
Jan
-8
5
Jan
-9
0
Jan
-9
5
Jan
-0
0
Jan
-0
5
Jan
-1
0
Jan
-1
5
Jan
-2
0
Culcairn(74188) Corowa(74034) Deniliquin (74128)
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Yearly groundwater take—Upper Murray alluvium
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0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
200
0-
01
200
1-
02
200
2-
03
200
3-
04
200
0-
05
200
5-
06
200
6-
07
200
7-
08
200
8-
09
200
9-
10
201
0-
11
201
1-
12
201
2-
13
201
3-
14
201
4-
15
201
5-
16
201
6-
17
201
7-
18
Usage V
olu
me (
ML)
Annual Extratction Pre WSP Annual Extraction Post WSP
Yearly Extraction Limit
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Yearly groundwater take—Upper Murray
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0
2,000
4,000
6,000
8,000
10,000
12,000
14,000
16,000
2011-12 2012-13 2013-14 2014-15 2015-16 2016-17 2017-18
Vo
lum
e (
ML)
Annual Extraction LTAAEL LTAAEL +10 trigger 5 year average annual extraction
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Hydrograph—GW036306 (Hopefield)
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Hydrograph—GW036281 (Howlong)
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13. Lower Murray alluvium
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Rainfall deviation from average
Page 89
-800
-600
-400
-200
0
200
400
600
800
1000
1200
Jan
-7
5
Jan
-8
0
Jan
-8
5
Jan
-9
0
Jan
-9
5
Jan
-0
0
Jan
-0
5
Jan
-1
0
Jan
-1
5
Jan
-2
0
Culcairn(74188) Corowa(74034) Deniliquin (74128)
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Yearly groundwater take—Lower Murray alluvium
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0
20,000
40,000
60,000
80,000
100,000
120,000
140,000
160,000
20
06
-07
20
07
-08
20
08
-09
20
09
-10
20
10
-11
20
11
-12
20
12
-13
20
13
-14
20
14
-15
20
15
-16
20
16
-17
20
17
-18
Vo
lum
e(M
L)
Annual Extraction 3-Year Average Annual Extraction LTAAEL LTAAEL +5% trigger
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Hydrograph—GW036823 Swan Hill
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Hydrograph—GW036765 (Womboota)
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Hydrograph—GW036742 (Deniliquin)
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Hydrograph—GW036586 Blighty
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Hydrograph—GW036638 Urana
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Hydrograph—GW036352 Lowesdale
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