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National Water Account 2017

Daly: Statement details

Above-average annual rainfall, particularly during December–February, the typically wetter months of the year, contributed to high annual streamflows across the region. Aquifer storage increased for the first time in five years.

 



 

For further information on the regions water accounting statements scroll down this page or click on the links below:

 

 

Water assets

  • Volumes of water stored in the rivers and aquifers cannot be quantified due to a lack of available data; however, information on the total annual change in aquifer storage is available.

 

Figure S1  Graph of total annual change in aquifer volume in the region at 30 June 2017 compared with the previous 5 years
Figure S1 Total annual change in aquifer volume in the region at 30 June 2017 compared with the previous 5 years

 

  • Above-average rainfall during the typically wetter months of the year contributed to an increase in aquifer storage; the first annual increase in aquifer storage for the region in 5 years.
  • Aquifer recharge was not as high as 2011–12, which was primarily attributed to well above-average rainfall over a 2-year period associated with the 2010–12 La Niña event.

 

Water liabilities

  • Water liabilities in the Daly region refer to the volume of allocation remaining on licence entitlements at the end of the 2016–17 year. 

 

Table S1 Volume of surface water allocation remaining at 30 June 2017
 Individual users
(ML)
Urban system
(ML)
Opening balance at 1 July 201600
Allocated5,8553,417
Allocated diversion(801)(2,444)
Adjustment and forfeiture(5,054)(973)
Closing balance at 30 June 201700

 

Table S2 Volume of groundwater allocation remaining at 30 June 2017
 Individual users
(ML)
Urban system
(ML)
Opening balance at 1 July 201600
Allocated111,4892,359
Allocated extraction(31,044)(760)
Adjustment and forfeiture(80,445)(1,599)
Closing balance at 30 June 201700

 

  • As there are no carry-over provisions for water supply licences in the Daly region, the portion of water allocation that has not been abstracted at the end of a water year is forfeited and the allocation remaining at the end of the year was 0 ML.
  • A more detailed description of water allocations and associated water rights in the Daly region is given in the Water rights note.

 

Water asset increases

  • Total water asset increases for the year was 13,594,957 ML.
  • The key items contributing to water asset increases for the region were runoff and recharge: landscape, which made up more than 95% of the surface water and groundwater increases, respectively.
  • Runoff and recharge were much higher than the previous year, which reflects the above-average rainfall conditions experienced across the region (see Climate and water).

 

Water asset decreases

  • Total water asset decreases for the year was 11,712,087 ML.
  • The key item contributing to water asset decreases for the region was outflow from surface water, which made up more than 95% of the total water asset decreases. The outflow was more than 13% greater than the previous year, which is primarily attributed to the above-average rainfall conditions experienced across the region (see Climate and water).
  • Groundwater decreases represent non-allocated water extractions, which generally change little from year to year.

 

Water flows

  • Total water inflows to the region was 13,594,957 ML, equal to the volume of Water asset increases.
  • Total water outflows from the region was 11,747,136 ML, slightly higher than the volume of Water asset decreases (11,712,087 ML) as it also includes flows corresponding to the accrual transactions—allocated diversions and allocated extractions (see the Water liabilities section above).
  • A detailed description on all the water flows associated with the surface water and groundwater stores is provided in the Water stores note.

 

Unaccounted-for difference

  • The unaccounted–for difference is the volume necessary to reconcile the opening water storage and closing water storage with the total water inflows and total water outflows reported in the water accounting statements.

 

Table S3 Calculation of unaccounted-for difference for the 2016–17 year
 Volume
ML
Opening water storage balance at 1 July 2016
Total inflows13,594,957
Total outflows(11,747,136)
Change in water storage(516,000)
Closing water storage balance at 30 June 2017
Unaccounted-for difference(1,331,821)

 

  • The unaccounted-for difference value is primarily attributed to uncertainties associated with the runoff estimate (see Methods).