18.12 Entitled extraction of allocated groundwater to urban water system

Supporting information

The volume recognised in the water accounting statements (1,842 ML) represents the volume of water extracted for urban water supply in the Ord region during the 2011–12 year.

Total volume of groundwater extracted from each groundwater resource for urban water supply during the 2011–12 year is given in the following table.


Volume of groundwater extracted for the urban water system during the 2011–12 year

Groundwater resource

Volume extracted (ML)

Kununurra town water supply bore field


Halls Creek town water supply bore field





Quantification approach

Data source

Operational Data Storage System.

Provided by

Water Corporation.


Inflow of groundwater into the urban water system is the total volume of groundwater extracted from the groundwater sources (bore fields) within the Ord region. Total water extracted is based on measured data collected at each source site using a cumulative water meter.

Assumptions, limitations, caveats and approximations


Uncertainty information

Expected error for water meters is +/– 5%.

The Department of Water requires that all water meters, when tested under in situ conditions, must be within 5% accuracy across the full flow rate range (Guidelines for water meter installation 2009).

Comparative year

This line item corresponds to line item '18.12 Groundwater allocation diversion – urban water system' reported in the 2011 Account.