Adelaide

The volume reported in the water accounting statement (3,644 ML) represents River Murray transfers that deliver water directly to the water distribution system, such as the potable supply to northern Adelaide through the Swan Reach – Stockwell Pipe Line. The line item has been included to adjust line item 13.6.5 Other lumped delivery of water transferred-in to connected surface water, which comprises all River Murray transfers into the Adelaide region including some transfers directly to the water distribution system. River Murray transfers were lumped into a single term because the associated non-physical water assets could not be divided into those delivering water to the connected surface water store (water storages and rivers) and those delivering water directly to the water distribution system (irrigation and urban supply systems).

Data source

SA Water: Geographic Information System (GIS) and Customer Service Information System (CSIS) databases.

Data provider

Bureau of Meteorology.

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. Only meters that were supplied with potable water from the Swan Reach Water Treatment Plant were considered. The SPNs were used to extract readings for individual water meters from the SA Water CSIS database for 2009–10.

Water consumption was calculated by analysing the difference between consecutive meter readings and summed for 2009–10. To account for meter readings that occurred immediately before or after 2009–10, metered consumption was apportioned based on the following equation:

V_r = ( t_r / t_m ) × V_m

where:

V_m = volume for metered period (kL)

V_r = volume for metered period within 2009–10 (kL)

t_m = length of period between meter readings (days)

t_r = length of metered period within 2009–10 (days).

Uncertainty

Estimated uncertainty is +/-5% to +/-10%.

Assumptions, approximations and caveats/limitations

Nil.