Adelaide
19.4 Delivery to urban water system users

Supporting information

a. Overall

The volume reported (133,356 ML) comprised of potable (127,729 ML) and recycled water (5,627 ML) consumption for various uses in the Adelaide region in the 2011–12 year. 

Water consumption per type and purpose in the 2011–12 year
Purpose Type of water
Potable Recycled
Residential use 86,060 172
Commercial, industrial, municipal use 25,074 2,717
Agricultural / individual irrigation use 3,472 270
Other use – urban use 13,123 0
Recycled water on-site outdoor / irrigation use 0 5
Recycled water on-site in-door use 0 0
Recycled water on-site within process use (no-recirculation) 0 2,463
Total 127,729 5,627

b. Potable water

The volume reported (127,729 ML) represents the volume of potable water supplied for residential, commercial, industrial, municipal and other uses as detailed in the following table.

Potable water consumption by landuse in the 2011–12 year

SA Water land use code

National Water Account land use code

Potable water consumption (ML)

Residential

Residential

86,060

Commercial

Commercial

7,430

Industrial

Industrial

7,032

Mining

Industrial

130

Public institution

Municipal

6,414

Public utility

Municipal

1,532

Recreational

Municipal

2,536

Country lands

Other–agriculture

2,412

Primary production

Other–agriculture

1,060

Sundry

Remaining other

11,331

Vacant land

Remaining other

1,792

Total

127,729

c. Recycled water

The volume reported (5,627 ML) represents the volume of recycled water produced by wastewater treatment plants (WWTPs) for various uses in the 2011–12 year as detailed in the following table.

Recycled water consumption in the 2011–12 year.
Wastewater treatment plant Application Volume (ML)
Aldinga 1 Agriculture irrigation

212

Christies Beach 2 Southern urban reuse project: residential use

44

Christies Beach On-site within process use 162
Angaston Agriculture irrigation

46

Bolivar 3 Mawson Lakes municipal use

82

Bolivar 4 Mawson Lakes residential use

128

Bolivar On-site within process use

2,301

Glenelg Adelaide municipal use

2,428

Gumeracha Commercial irrigation

45

Hahndorf Commercial use

3

Myponga Livestock irrigation

12

Victor Harbor Municipal and agricultural irrigation

159

Bird-in-Hand On-site outdoor / irrigation use

5

Total  

5,627

1 This volume of water was supplied from Aldinga WWTP to an individual customer for vineyard irrigation in the McLaren Vale (155 ML) and other private users (57 ML). Another 178 ML of recycled water was transferred to Willunga Basin Water Company for irrigation (line item 19.6 Urban water discharge to irrigation scheme). The total volume of recycled water reused from Aldinga WWTP was 390 ML.

2 This volume of water was supplied from Christies Beach WWTP for the Southern urban reuse project. Another 2,244 ML of recycled water was transferred to Willunga Basin Water Company for irrigation (line item 19.6 Urban water discharge to irrigation scheme).

3-4 These volumes of water were supplied from Bolivar WWTP to Mawson Lakes, where they were mixed with storm water and potable water for residential and municipal uses. Another 14,900 ML of recycled water was transferred to Virginia Pipeline Scheme for irrigation (line item 19.6 Urban water discharge to irrigation scheme).

d. Urban water system overview

The urban water supply system is one of three sub-components of Adelaide's urban water system. The three sub-components are the:

  • urban water supply system
  • wastewater system
  • recycled water system.

During the 2011–12 year the majority (66%) of Adelaide's urban water was sourced from catchments within the region (line item 11.2). Imported River Murray (line item 11.9) water constituted approximately 31% of the urban water supply system's source water. Also, during the 2011–12 year, the Adelaide desalination plant commenced operating and made up the remaining 3% of Adelaide's urban water sources (line item 11.6).

Urban potable water consumption (line item 19.4) was 127,729 ML during the 2011–12 year, representing 84% of all outflows from the urban water supply system. A very small volume of water (2%) was transferred out of the region via normal operations in SA Water's service area (line item 19.11). Non-revenue water, including pipes bursting and background leakage (line item 19.3) and other losses (line item 19.20), made up the remaining urban water supply system outflows.

The following figure shows all the inflows and outflows for the urban water supply system. For more detail on a particular flow associated with the urban water supply system, refer to the line item notes.


Schematic diagram of water inflows and outflows for Adelaide's urban water supply system during the 2011–12 year; line item numbers are provided in brackets
Schematic diagram of water inflows and outflows for Adelaide's urban water supply system during the 2011–12 year; line item numbers are provided in brackets

e. Recycled water system overview

The recycled water system is one of three sub-components of Adelaide's urban water system. The three sub-components are the:
  • urban water supply system
  • wastewater system
  • recycled water system.

In the Adelaide region, the majority of wastewater treatment plants produce recycled water which is subsequently provided to users (including irrigation schemes) or used on-site.

During the 2011–12 year, approximately 75% of the recycled water produced was provided to the region's irrigation schemes (line item 19.6). Approximately 11% of recycled water was used on-site at wastewater treatment plants, predominantly for on-site in-process uses (part of line item 19.4). The remaining recycled water produced in Adelaide (3,159 ML) was supplied to urban water system users (part of line item 19.4).

The following figure presents the inflows and outflows associated with the recycled water system. A very small misbalance (0.6%) is shown, due to the difference between the volume of recycled water produced and the volume of recycled water supplied for use, and can be attributed to metering inaccuracies and unaccounted losses.

For more detail on a particular flow associated with the recycled water system, refer to the line item notes. Note that volumes annotated with a * indicate flows between urban sub-components and are not reported in the Account 2012. As such, these flows do not have an associated line item number or note.

Schematic diagram of water inflows and outflows during the 2011–12 year for Adelaide's recycled water system; line item numbers are provided in brackets
Schematic diagram of water inflows and outflows during the 2011–12 year for Adelaide's recycled water system; line item numbers are provided in brackets

Quantification approach

Potable water

Data source

SA Water: Supervisory Control and Data Acquisition (SCADA), geographic information system (GIS) and customer service information system (CSIS) databases.

Provided by

SA Water.

Method

A shapefile of the Adelaide region was used to extract the service point numbers (SPNs) of meters within the Adelaide region from the SA Water GIS database. The SPNs were then used to extract water meter readings for 2011–12 and primary land use codes for each meter from CSIS.

Water consumption was calculated by analysing the difference between consecutive meter readings and summed for 2011–12. To account for meter readings that occurred immediately before or after 2011–12, metered consumption was apportioned based on the following equation:

Vr = ( tr / tm ) × Vm

Where:

Vr = volume for metered period within 2011–12 (kL)
tm = length of period between meter readings (days)
tr = length of metered period within 2011–12 (days)
Vm = volume for metered period (kL).

The primary land use codes were reclassified as residential, commercial/industrial/municipal or other. Then total water consumption for the Adelaide region was calculated by summing the 2011–12 water consumption for each meter based on the 2012 Account land use classes.

Assumptions, limitations, caveats and approximations

  • Apportionment: The method used for apportionment assumes that consumption is constant over the period between meter readings. This may not reflect the actual consumption, which may vary based on seasonal patterns.
  • SPNs: The method assumes that all relevant SPNs have been captured in the GIS accurately and completely.
  • Primary land use: The method assumes that all SPNs have an accurate allocation of primary land use codes and each SPN represents a single land use; however, it is likely that each SPN is providing water for several land uses.

Uncertainty information

The uncertainty estimate was not quantified.

Recycled water

Data source

SA Water: wastewater treatment plant (WWTP) records.

Provided by

SA Water.

Method

Measured meter data relating to the volume of recycled water supplied for residential, commercial, industrial, municipal and agricultural/individual irrigation use in the 2011–12 year was obtained from SA Water WWTP records.

The only exception is the volume of recycled water from Aldinga WWTP to other individual users (212 ML); it was calculated by deducting the metered volumes of water transferred to the Willunga Basin Water Company (178 ML, see line item 19.6 'Urban water discharge to irrigation scheme') from the measured total volume of recycled water produced at Aldinga WWTP (390 ML). 

Assumptions, limitations, caveats and approximations

  • Item does not include any community wastewater management systems (CWMS) managed by local councils.
  • The volume reported as supply from Bolivar WWTP to MawsonLakes is the total volume supplied. It is mixed with stormwater and potable water, and supplied to residential and municipal uses.

Uncertainty information

The uncertainty estimate was not quantified.

Comparative year

In the 2011 Account, volumes of recycled water used on-site at the wastewater treatment plants were not reported under the line item. The 2010–11 volume was restated as per the following table to account for this change of scope.


Restatement of comparative year information for line item 19.4 Delivery to urban water users

Type of water / purpose

2012 Account volume for the 2010–11 year (ML)

2011 Account volume for the 2010–11 year (ML)

Additional information

Potable

123,102

123,102

 

Recycled

 

 

 

Residential use

10

10

 

Commercial, industrial, municipal use

2,362

2,362

 

Agricultural / individual irrigation use

212

212

 

Other use–urban use

0

0

 

Recycled water on-site outdoor / irrigation use

68

0

scope change

Recycled water on-site within process use (no-recirculation)

1453

0

scope change

Subtotal recycled water

4,105

2,584

 

Total

127,207

125,686