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TRANSCRIPT
Amendments to the
WAP
Simone Stewart
Recharge Rates: This is what we heard:
• The 10 year rolling average recharge rates don’t reflect the
groundwater trends
• It’s not clear how the recharge rates under the previous WAP were
calculated
• The recharge rates should be recalculated
Recharge Rates: This is what we did:
• Recalculated the recharge rates for the different lenses and brackish
areas (except Uley South which used the RR from Ordens et al. which is based on
multiple lines of evidence)
• Based it upon the 2008 water level rise – which corresponds to
lowest storage in past 12 years (low rainfall year)
53 wells used in Musgrave
19 wells used in SB
Recharge Rates: The amendment
^ No data available
* No observed rise in watertable
PWAQuaternary water
resource
Recharge rate Draft
WAP (mm/y)
Average recharge
rate 2008 (mm/y)
Southern Basins
Coffin Bay A 29 25
Coffin Bay C 9 1.9
Lincoln B 35 0.0 ^
Lincoln C 35 0.0 *
Lincoln South brackish 35 33
Uley East A 22 73.5
Uley East B 22 0.0 *
Uley North brackish 13 7.5
Uley Wanilla 13 20.5
Uley Wanilla brackish 13 20.5
Musgrave
Bramfield 2.5 2.2
Bramfield brackish 14.1 5
Kappawanta 22 11.4
Sheringa A 16.3 0.0 *
Sheringa B 15.8 0.7
Sheringa brackish 14.1 5.9
Polda 15.8 5.6
Polda brackish 14.1 11.2
Polda East A 6.8 0.0 ^
Polda East B 6.8 0.0 *
Talia 15.8 0.0 *
Uley South: This is what we heard:
• The portion of the resource set aside to the environment is too little
(30%)
• The environment should get at least 60% of the resource capacity
• The environment is missing out
Uley South: This is what we did:
• Commissioned Flinders University to run some scenarios on the Uley
South model to determine the impacts of various portions going to
the environment
PWA Pumping rate (ML/y) Portion for Environment (%)
Base case 4740 66.37
S1 7250 48.5
S2 9900 30
S3 8490 40
S4 7070 50
S5 5650 60
Uley South: The amendment
• The portion of the resource set aside to the environment in Uley
South has been varied from 30% to 48.5%
Polda: This is what we heard:
• SA Water shouldn’t be allowed to pump from Polda
• No more water should be taken from Polda
• Licensees want access to water (draft WAP – current storage is below the
lower storage trigger)
Polda: This is what we did:
• SA Water voluntarily relinquished their licence for Polda, Polda
North and Kappawanta
• Restricted new users coming into the area leaving only 10 ML of
excess water
• Allowed users to extract half their WAE at current storage levels
Polda: The amendment
• Reserved the Polda consumptive pool for Irrigation, Industrial or
Recreational uses only
• Increased the portion of water to the environment to 97.6%
• Varied the lower storage trigger from 99% to 68%